Regional Migration Forecast: 4-11 September 2015

Screenshot 2015-09-04 13.37.43

Continental Summary

More favorable conditions with persist across the West this week, with light to moderate flights featuring Killdeer, Warbling Vireo, Swainson’s Thrush, MacGillivray’s Warbler, and Western Tanager, while the East experiences increasingly favorable conditions building to spawn moderate to heavy flights featuring Great Egret, Swainson’s Hawk, Red-eyed Vireo, Black-and-white Warbler, Yellow Warbler, and Chestnut-sided Warbler, by week’s end.

Wondering what species are migrating through right now? Check out our analysis for the past 7 days.

Arrows show wind speed and direction (arrow points in the direction to which wind is blowing) 100 m above ground level. Areas with southerly winds are colored red; northerly winds colored blue. Accumulated precipitation (in 6 hour intervals) is green, outlined by white. Broadly speaking, areas of the map in blue will experience conditions that are favorable for migration, and areas where blue and green (and red and blue) intersect and overlap may experience migrant concentrations and fallouts as migrants interact with precipitation.

We use data collected by eBird users help make more accurate forecasts. If you enjoy the predictions contained in these posts, please consider submitting your own bird sightings to eBird to even further improve the content. Every observation counts, whether it be a single bird at a feeder in your backyard, or an entire day spent in a national park. To get started with eBird, head on over to the site!

Need a review of our definitions for regions, species on the move, and migration amounts? Please visit this link.

Quick Links to Regions

Upper Midwest and NortheastBirdCast Upper Midwest and Northeast Region Gulf Coast and SoutheastBirdCast Upper Southeast Region
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BirdCast West Region

Upper Midwest and Northeast

A coastal pulse of moderate to locally heavy flights kicks off the weekend, before warmer air and more southerly flow builds into the region and quiets the system through Wednesday. But by mid week, a stronger frontal boundary pushing through the region will bring widespread moderate to heavy, even locally very heavy, flights, first to the Great Lakes and Mississippi River valley on Wednesday night and then to the Ohio River valley, Appalachians, and Atlantic coast.

Screenshot 2015-09-04 13.33.37

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Bald Eagle ** Before July 1 9/2 11/6 - -
Northern Waterthrush ** 7/28 8/24 9/10 9/30 10/12
Northern Harrier ** 8/1 9/26 10/20 11/10 11/27
Cooper's Hawk *** 8/3 9/10 10/7 11/2 11/16
Prairie Warbler * 8/4 8/21 9/9 9/30 10/13
Wilson's Snipe * 8/6 10/1 10/16 11/2 11/19
Green-winged Teal ** 8/8 8/22 10/27 11/22 12/10
Northern Shoveler ** 8/9 10/15 11/10 12/1 12/16
Red-breasted Nuthatch *** 8/9 9/9 10/2 - -
Black-and-white Warbler *** 8/10 8/28 9/13 10/2 10/14
Blackburnian Warbler *** 8/10 8/23 9/8 9/27 10/9
American Golden-Plover ** 8/11 8/23 9/10 9/27 10/13
Ovenbird *** 8/11 8/26 9/13 10/2 10/14
Golden-winged Warbler * 8/11 8/22 9/7 9/23 10/5
Chestnut-sided Warbler *** 8/11 8/24 9/9 9/27 10/9
Sora * 8/12 8/28 9/21 10/16 10/30
American Redstart *** 8/12 8/27 9/11 9/30 10/12
Warbling Vireo *** 8/13 8/21 9/3 9/19 9/30
Veery *** 8/13 8/22 9/5 9/22 10/5
Red-eyed Vireo *** 8/15 8/25 9/7 9/28 10/13
Kentucky Warbler * 8/15 8/21 8/31 9/17 9/29
Wilson's Warbler *** 8/15 8/26 9/11 9/28 10/9
Turkey Vulture *** 8/16 9/5 9/28 10/31 11/25
Eastern Whip-poor-will * 8/16 8/21 8/30 9/19 10/2
Yellow-throated Vireo *** 8/16 8/25 9/8 9/26 10/8
Tennessee Warbler *** 8/16 8/30 9/16 10/4 10/18
White-eyed Vireo *** 8/17 8/27 9/10 9/28 10/10
Hooded Warbler * 8/17 8/26 9/9 9/27 10/10
Merlin *** 8/19 9/4 9/28 10/26 11/16
Yellow-throated Warbler * 8/19 8/29 9/12 9/30 10/12
Magnolia Warbler ****! 8/20 9/1 9/17 10/3 10/15
Sabine's Gull * 8/22 9/2 9/16 10/1 10/10
Red-headed Woodpecker * 8/22 9/1 9/13 10/2 10/14
Philadelphia Vireo *** 8/22 9/3 9/17 10/2 10/12
Nashville Warbler *** 8/22 9/5 9/21 10/9 10/23
Cape May Warbler *** 8/22 9/4 9/19 10/5 10/17
Bay-breasted Warbler *** 8/22 9/2 9/16 10/2 10/13
Black-throated Blue Warbler *** 8/22 9/6 9/23 10/12 10/26
Pine Warbler *** 8/22 9/5 9/22 10/11 10/25
Parasitic Jaeger * 8/23 9/6 9/25 11/15 11/30
Wood Thrush ** 8/23 8/30 9/11 9/28 10/15
Scarlet Tanager *** 8/23 9/2 9/15 10/3 10/15
Red-shouldered Hawk ** 8/24 9/5 9/22 11/13 11/22
Monk Parakeet * 8/24 9/23 11/4 12/10 -
Swainson's Thrush *** 8/24 9/4 9/19 10/5 10/16
Black-throated Green Warbler *** 8/24 9/5 9/20 10/7 10/19
Blue Jay ****! 8/25 9/8 9/28 10/16 -
Connecticut Warbler * 8/25 9/5 9/19 10/5 10/16
Common Yellowthroat *** 8/25 9/3 9/18 10/9 10/24
Northern Parula *** 8/25 9/6 9/20 10/6 10/18
Summer Tanager * 8/25 9/3 9/16 10/3 10/15
Sharp-shinned Hawk *** 8/26 9/10 10/7 11/8 11/22
Broad-winged Hawk *** 8/26 9/5 9/18 10/3 10/14
Rose-breasted Grosbeak *** 8/26 9/5 9/16 10/3 10/14
American Kestrel *** 8/27 9/10 9/28 10/19 11/5
Brown Thrasher *** 8/27 9/7 9/21 10/7 10/20
Blackpoll Warbler *** 8/27 9/7 9/23 10/9 10/21
Northern Flicker ****! 8/28 9/9 9/26 10/13 10/30
House Wren *** 8/28 9/4 9/15 10/7 10/23
Gray Catbird *** 8/28 9/6 9/17 10/9 10/24

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Red Knot * - Before July 1 8/28 9/15 9/28
Sanderling ** - Before July 1 9/1 9/23 10/6
Stilt Sandpiper ** Before July 1 7/15 8/21 9/11 9/25
Western Sandpiper * Before July 1 7/15 8/24 9/17 10/1
Belted Kingfisher ** Before July 1 7/27 9/20 10/14 -
Royal Tern * 7/12 7/31 8/25 11/10 11/25
White-rumped Sandpiper * 7/22 8/6 8/26 9/13 9/28
Wilson's Phalarope * Before July 1 8/7 8/22 9/10 9/22
Red-necked Phalarope * 7/28 8/11 8/27 9/13 9/27
Worm-eating Warbler * 8/1 8/11 8/25 9/12 9/24
Blue-winged Warbler * 8/1 8/13 8/28 9/14 9/27
Prothonotary Warbler * 8/7 8/13 8/21 9/10 9/22
Black Tern * Before July 1 8/14 8/25 9/12 9/24
Ruby-throated Hummingbird *** 7/30 8/14 8/28 9/21 10/5
Blue-gray Gnatcatcher ** 8/4 8/14 8/25 9/15 9/29
Mourning Warbler * 8/4 8/15 9/1 9/21 10/7
Olive-sided Flycatcher * 8/4 8/16 8/30 9/15 9/27
Eastern Wood-Pewee *** 8/5 8/16 8/29 9/22 10/9
Canada Warbler ** 8/5 8/16 8/30 9/15 9/26
Bobolink ** 8/5 8/16 8/31 9/19 10/15
Baird's Sandpiper ** 8/6 8/17 8/30 9/15 9/25
Common Nighthawk *** 8/7 8/17 8/31 9/14 9/25
Great Crested Flycatcher * 8/12 8/17 8/25 9/14 9/26
Blue-winged Teal ** 8/4 8/18 9/9 10/22 11/6
Least Flycatcher ** 8/7 8/18 9/3 9/22 10/5
Buff-breasted Sandpiper * 8/10 8/20 9/3 9/17 9/28
Yellow-bellied Flycatcher * 8/9 8/20 9/5 9/21 10/4
Eastern Whip-poor-will * 8/16 8/21 8/30 9/19 10/2
Warbling Vireo *** 8/13 8/21 9/3 9/19 9/30
Kentucky Warbler * 8/15 8/21 8/31 9/17 9/29
Prairie Warbler * 8/4 8/21 9/9 9/30 10/13
Green-winged Teal ** 8/8 8/22 10/27 11/22 12/10
Veery ** 8/13 8/22 9/5 9/22 10/5
Golden-winged Warbler * 8/11 8/22 9/7 9/23 10/5
American Golden-Plover ** 8/11 8/23 9/10 9/27 10/13
Blackburnian Warbler ** 8/10 8/23 9/8 9/27 10/9
Northern Waterthrush ** 7/28 8/24 9/10 9/30 10/12
Chestnut-sided Warbler *** 8/11 8/24 9/9 9/27 10/9
Yellow-throated Vireo ** 8/16 8/25 9/8 9/26 10/8
Red-eyed Vireo *** 8/15 8/25 9/7 9/28 10/13
Ovenbird ** 8/11 8/26 9/13 10/2 10/14
Hooded Warbler * 8/17 8/26 9/9 9/27 10/10
Wilson's Warbler *** 8/15 8/26 9/11 9/28 10/9
White-eyed Vireo ** 8/17 8/27 9/10 9/28 10/10
American Redstart *** 8/12 8/27 9/11 9/30 10/12
Sora * 8/12 8/28 9/21 10/16 10/30
Black-and-white Warbler *** 8/10 8/28 9/13 10/2 10/14

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Mississippi Kite * - - Before July 1 9/4 9/18
Yellow-billed Cuckoo * - - Before July 1 10/3 10/17
Tree Swallow *** - - Before July 1 8/30 11/10
Cliff Swallow * - - Before July 1 8/29 9/18
Roseate Tern * - Before July 1 7/20 9/1 9/23
Willet * - Before July 1 7/21 9/6 9/21
Black Skimmer * - Before July 1 7/23 9/22 10/21
Common Gallinule * - Before July 1 7/26 9/12 11/2
Black-necked Stilt * - Before July 1 7/28 9/4 9/19
Short-billed Dowitcher ** - Before July 1 7/29 9/10 9/23
American Oystercatcher * - Before July 1 7/29 8/30 9/25
Black-crowned Night-Heron * - Before July 1 7/31 8/27 10/30
Whimbrel * Before July 1 7/9 8/1 9/18 10/4
Common Tern ** - Before July 1 8/1 8/26 10/4
Bank Swallow ** - Before July 1 8/1 8/28 9/15
Clapper Rail * - Before July 1 8/1 8/28 10/29
Killdeer *** - Before July 1 8/2 10/28 11/26
Eastern Kingbird *** - - 8/2 8/27 9/12
Yellow-crowned Night-Heron * - Before July 1 8/3 10/8 10/28
Barn Swallow *** Before July 1 7/22 8/4 8/30 9/16
Chimney Swift *** - - 8/5 10/10 10/25
Blue Grosbeak * Before July 1 7/18 8/5 8/31 10/17
Spotted Sandpiper *** Before July 1 7/1 8/6 9/5 9/24
Snowy Egret ** - Before July 1 8/7 10/15 11/3
Little Blue Heron * Before July 1 7/21 8/9 8/26 10/20
Great Blue Heron *** - Before July 1 8/10 10/19 12/8
Tricolored Heron * 7/14 7/26 8/11 10/7 10/22
Upland Sandpiper * 7/26 8/1 8/11 8/29 9/12
Great Egret *** Before July 1 7/11 8/12 10/19 11/6
Ruddy Turnstone ** Before July 1 7/25 8/12 8/29 9/17
Green Heron *** - Before July 1 8/13 9/15 10/7
Solitary Sandpiper ** Before July 1 7/11 8/13 9/8 10/7
Laughing Gull ** Before July 1 7/15 8/13 11/12 12/5
Osprey *** - Before July 1 8/16 10/15 11/8
Pectoral Sandpiper ** Before July 1 7/18 8/16 9/24 11/20
Semipalmated Sandpiper *** 7/1 7/13 8/16 9/10 9/28
Semipalmated Plover *** 7/1 7/25 8/17 9/8 10/4
Forster's Tern * - Before July 1 8/17 9/18 11/30
Cedar Waxwing *** - Before July 1 8/17 9/27 11/26
Wood Duck ** Before July 1 7/6 8/18 10/31 11/21
Lesser Yellowlegs *** - Before July 1 8/18 9/10 9/25
Least Sandpiper *** - Before July 1 8/18 9/11 9/25
Baltimore Oriole *** 7/29 8/7 8/19 9/6 9/18
Black-bellied Plover * 7/20 8/1 8/20 9/3 12/1
Greater Yellowlegs ** - Before July 1 8/20 9/11 11/28
Marbled Godwit * 7/22 8/2 8/20 9/5 9/21
Caspian Tern ** Before July 1 7/17 8/20 9/14 10/20
Stilt Sandpiper * Before July 1 7/15 8/21 9/11 9/25
Prothonotary Warbler * 8/7 8/13 8/21 9/10 9/22
Wilson's Phalarope * Before July 1 8/7 8/22 9/10 9/22
Western Sandpiper * Before July 1 7/15 8/24 9/17 10/1
Black Tern ** Before July 1 8/14 8/25 9/12 9/24
Great Crested Flycatcher *** 8/12 8/17 8/25 9/14 9/26
Blue-gray Gnatcatcher *** 8/4 8/14 8/25 9/15 9/29
Worm-eating Warbler * 8/1 8/11 8/25 9/12 9/24
Royal Tern * 7/12 7/31 8/25 11/10 11/25
White-rumped Sandpiper * 7/22 8/6 8/26 9/13 9/28
Red-necked Phalarope * 7/28 8/11 8/27 9/13 9/27
Red Knot * - Before July 1 8/28 9/15 9/28
Ruby-throated Hummingbird *** 7/30 8/14 8/28 9/21 10/5
Blue-winged Warbler ** 8/1 8/13 8/28 9/14 9/27

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Northern Rough-winged Swallow ** - - Before July 1 8/5 10/24
Wilson's Storm-Petrel * - Before July 1 7/21 8/6 9/22
Orchard Oriole *** - - Before July 1 8/7 9/5
Louisiana Waterthrush * - - Before July 1 8/9 8/31
Alder Flycatcher * - Before July 1 7/20 8/11 8/26
Least Bittern * - Before July 1 7/17 8/12 9/3
Least Tern ** - Before July 1 7/23 8/15 9/7
Glossy Ibis * - Before July 1 7/23 8/17 9/26
Piping Plover * - Before July 1 7/25 8/17 9/10
Yellow Warbler *** - - Before July 1 8/18 10/7
Purple Martin *** - Before July 1 7/26 8/19 9/8
Gull-billed Tern * - Before July 1 7/30 8/20 9/4
Little Blue Heron * Before July 1 7/21 8/9 8/26 10/20
Common Tern *** - Before July 1 8/1 8/26 10/4
Black-crowned Night-Heron * - Before July 1 7/31 8/27 10/30
Eastern Kingbird *** - - 8/2 8/27 9/12
Bank Swallow *** - Before July 1 8/1 8/28 9/15
Clapper Rail * - Before July 1 8/1 8/28 10/29

Gulf Coast and Southeast

A coastal movement in the Carolinas, Georgia, and peninsular Florida over the weekend will see locally moderate to heavy flights. But these movements are the migration highlight for the bulk of the period. Scattered light to moderate flights will occur elsewhere in the region in marginal and unfavorable conditions, depending on the strength of southerly flow across the region. Not until the end of the period, or the beginning of the next period, does the region see the arrival of more favorable conditions, and moderate to heavy flights (and those will be mostly west of the Mississippi River and north of the Gulf Coast).

Screenshot 2015-09-04 13.34.52

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Prairie Warbler ** 7/23 9/8 9/23 10/13 10/30
Ruby-throated Hummingbird *** 7/26 8/30 9/13 10/5 10/20
Great Blue Heron ** 7/27 10/21 11/19 - -
Cooper's Hawk ** 7/29 9/11 10/24 11/11 11/22
Yellow-throated Warbler ** 7/31 9/6 9/26 10/19 11/4
Hooded Warbler ** 8/3 9/3 9/20 10/11 10/27
Blue-gray Gnatcatcher *** 8/4 8/25 9/13 10/1 10/14
Northern Parula *** 8/7 9/3 9/23 10/17 11/2
Blue-winged Teal *** 8/8 8/25 11/2 - -
Worm-eating Warbler ** 8/9 8/29 9/15 10/4 10/17
American Golden-Plover * 8/10 8/21 9/5 9/20 10/1
Belted Kingfisher *** 8/12 9/14 10/26 - -
Bullock's Oriole * 8/13 8/21 9/2 9/18 9/30
Canada Warbler ** 8/13 8/24 9/9 9/26 10/9
Pine Warbler *** 8/13 9/6 10/3 - -
Yellow-breasted Chat ** 8/13 8/23 9/7 9/25 10/9
Swainson's Warbler * 8/14 8/25 9/13 10/5 10/24
Chuck-will's-widow * 8/15 8/31 9/17 10/6 10/20
Least Flycatcher ** 8/15 8/30 9/14 10/1 10/13
Mourning Warbler ** 8/15 8/27 9/12 9/28 10/10
Yellow-bellied Flycatcher * 8/15 8/31 9/15 10/3 10/15
Brown-crested Flycatcher * 8/16 8/23 9/1 9/20 10/2
Eastern Wood-Pewee *** 8/16 9/1 9/19 10/12 10/29
Yellow-throated Vireo *** 8/16 8/30 9/15 10/3 10/17
Black-billed Cuckoo * 8/17 9/5 9/26 10/18 11/1
Baltimore Oriole *** 8/18 8/30 9/14 9/30 10/10
Black-and-white Warbler *** 8/18 9/6 9/26 10/18 11/5
Blue-winged Warbler ** 8/19 9/1 9/17 10/4 10/16
Northern Waterthrush *** 8/19 9/3 9/19 10/7 10/21
Summer Tanager *** 8/19 8/31 9/15 10/4 10/19
White-eyed Vireo *** 8/19 9/3 9/20 10/11 10/30
Acadian Flycatcher ** 8/20 9/1 9/16 10/5 10/18
Bald Eagle ** 8/21 9/18 After Dec 31 - -
Bobolink ** 8/21 9/4 9/21 10/9 10/23
Red-eyed Vireo *** 8/22 9/5 9/19 10/8 10/23
Warbling Vireo * 8/23 9/3 9/17 10/3 10/14
Wilson's Warbler *** 8/23 9/4 9/19 10/4 10/14
Blackburnian Warbler *** 8/24 9/6 9/22 10/9 10/23
Red-headed Woodpecker ** 8/24 9/4 9/18 10/6 11/11
Black Vulture ** 8/25 10/15 After Dec 31 - -
Chestnut-sided Warbler *** 8/25 9/6 9/22 10/10 10/23
Ovenbird *** 8/26 9/9 9/27 10/16 11/2
Chimney Swift *** 8/27 9/7 9/20 10/11 10/25
Golden-winged Warbler * 8/27 9/7 9/22 10/7 10/19
Broad-winged Hawk ** 8/28 9/9 9/25 10/13 11/1
Veery *** 8/28 9/7 9/21 10/5 10/16

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Short-billed Dowitcher * Before July 1 7/3 8/27 9/14 9/25
Least Sandpiper *** Before July 1 7/9 8/25 9/18 -
Western Sandpiper ** Before July 1 7/11 9/1 9/20 10/2
Semipalmated Sandpiper *** Before July 1 7/15 8/23 9/16 10/15
Piping Plover * Before July 1 7/16 9/1 - -
Common Tern * Before July 1 7/20 8/22 9/24 11/9
Semipalmated Plover ** 7/14 7/30 8/21 9/10 10/2
Wilson's Phalarope * 7/19 8/2 8/22 9/12 10/3
Black-bellied Plover * 7/23 8/6 11/2 - -
Black Tern ** 7/20 8/8 8/24 9/13 9/27
Prothonotary Warbler * 8/2 8/11 8/28 9/23 10/9
Caspian Tern * 7/26 8/13 10/26 11/23 -
Cerulean Warbler * 8/1 8/13 8/28 9/14 9/26
Buff-breasted Sandpiper * 7/31 8/14 8/30 9/17 9/30
Kentucky Warbler * 8/4 8/15 9/2 9/24 10/9
Yellow Warbler *** 7/29 8/16 9/7 9/29 10/15
Alder Flycatcher * 8/4 8/17 9/3 9/20 10/4
Bank Swallow ** 8/6 8/17 9/1 9/16 9/28
Bell's Vireo * 8/8 8/18 8/29 9/23 10/10
Common Nighthawk * 8/10 8/18 8/28 9/19 10/4
Dickcissel * 8/10 8/19 9/2 9/24 10/16
Olive-sided Flycatcher * 8/6 8/19 9/5 9/23 10/7
Willow Flycatcher * 8/5 8/19 9/5 9/25 10/9
Great Crested Flycatcher *** 8/11 8/20 9/1 9/20 10/5
White-rumped Sandpiper * 8/8 8/20 9/5 9/22 10/5
American Golden-Plover * 8/10 8/21 9/5 9/20 10/1
Bullock's Oriole * 8/13 8/21 9/2 9/18 9/30
Brown-crested Flycatcher * 8/16 8/23 9/1 9/20 10/2
Yellow-breasted Chat ** 8/13 8/23 9/7 9/25 10/9
Canada Warbler ** 8/13 8/24 9/9 9/26 10/9
Blue-gray Gnatcatcher *** 8/4 8/25 9/13 10/1 10/14
Blue-winged Teal ** 8/8 8/25 11/2 - -
Swainson's Warbler * 8/14 8/25 9/13 10/5 10/24
Mourning Warbler * 8/15 8/27 9/12 9/28 10/10

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black-chinned Hummingbird * - - Before July 1 9/20 10/10
Blue Grosbeak * - - Before July 1 8/26 11/1
Green Heron ** - - Before July 1 9/20 10/9
Louisiana Waterthrush * - - Before July 1 9/11 9/29
Yellow-crowned Night-Heron * - - Before July 1 9/24 10/21
Eastern Kingbird ** - - 7/4 9/21 10/7
Least Tern ** - Before July 1 7/21 9/5 9/21
Gull-billed Tern * - Before July 1 7/23 9/7 9/29
Black Skimmer * - Before July 1 8/6 9/4 9/18
Black-bellied Whistling-Duck * - Before July 1 8/6 9/21 12/6
Barn Swallow *** - Before July 1 8/8 9/8 11/5
Mississippi Kite *** - - 8/8 8/28 9/12
Whimbrel * 7/8 7/24 8/9 8/24 9/4
Black-necked Stilt ** 7/14 7/27 8/11 9/16 11/28
Cattle Egret ** - - 8/12 9/25 -
Orchard Oriole ** - - 8/13 9/12 9/30
Gray Kingbird * - - 8/14 9/16 10/11
Stilt Sandpiper * 7/5 7/21 8/15 9/14 11/21
Wilson's Plover * Before July 1 7/27 8/15 9/8 9/26
Solitary Sandpiper ** - Before July 1 8/17 9/13 10/5
Spotted Sandpiper ** Before July 1 7/19 8/17 9/12 10/3
Black-headed Grosbeak * - - 8/18 9/8 9/23
Pectoral Sandpiper ** Before July 1 7/26 8/18 9/22 10/8
Sandwich Tern * Before July 1 7/28 8/19 9/8 12/9
Baird's Sandpiper * 7/8 7/28 8/20 9/24 10/9
Upland Sandpiper ** 7/21 8/3 8/20 9/8 9/23
Semipalmated Plover ** 7/14 7/30 8/21 9/10 10/2
Common Tern * Before July 1 7/20 8/22 9/24 11/9
Wilson's Phalarope * 7/19 8/2 8/22 9/12 10/3
Semipalmated Sandpiper ** Before July 1 7/15 8/23 9/16 10/15
Black Tern *** 7/20 8/8 8/24 9/13 9/27
Least Sandpiper ** Before July 1 7/9 8/25 9/18 -
Short-billed Dowitcher * Before July 1 7/3 8/27 9/14 9/25
Cerulean Warbler * 8/1 8/13 8/28 9/14 9/26
Common Nighthawk ** 8/10 8/18 8/28 9/19 10/4
Prothonotary Warbler * 8/2 8/11 8/28 9/23 10/9

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Cliff Swallow ** - - Before July 1 7/8 10/7
Purple Martin *** - - Before July 1 7/19 9/5
Least Bittern * - - Before July 1 8/1 10/18
Bachman's Sparrow * - - Before July 1 8/4 9/5
Western Kingbird ** - - Before July 1 8/7 9/7
Swallow-tailed Kite ** - - Before July 1 8/15 8/31
Cassin's Sparrow * - - Before July 1 8/19 9/15
Whimbrel * 7/8 7/24 8/9 8/24 9/4
Blue Grosbeak ** - - Before July 1 8/26 11/1
Mississippi Kite *** - - 8/8 8/28 9/12

Great Plains

A quiet weekend for migration yields to a much more exciting work week, with moderate to heavy flights on Sunday through Tuesday nights. Some of these flights, particularly those in the central Plains on Tuesday night, may occur in close proximity to precipitation, creating concentration and fallout potential in these areas. A slight brief respite in the excitement follows on Wednesday night, before a larger and cooler air mass arrives to end the week. As this air mass arrives, moderate to heavy, and even local very heavy, flights will follow.

Screenshot 2015-09-04 13.36.14

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Red-necked Phalarope * Before July 1 8/25 9/9 9/30 10/14
Ring-billed Gull *** 7/16 10/23 11/10 11/29 -
Swainson's Hawk ** 7/28 8/21 9/7 10/4 10/21
American Golden-Plover * 8/6 9/3 9/27 10/23 11/19
Tennessee Warbler ** 8/7 8/22 9/10 9/30 10/16
Wilson's Snipe * 8/7 10/3 10/18 11/4 11/16
Cooper's Hawk *** 8/8 9/2 9/25 10/20 11/10
Warbling Vireo NA 8/10 9/6 9/12 9/21 10/3
Chestnut-sided Warbler ** 8/11 8/21 9/5 9/20 10/2
Red-shouldered Hawk * 8/11 9/5 9/30 10/26 -
Rose-breasted Grosbeak ** 8/12 8/22 9/4 9/25 10/10
Say's Phoebe * 8/12 8/25 9/7 9/28 10/11
Magnolia Warbler ** 8/13 8/24 9/9 9/25 10/7
Blackpoll Warbler * 8/15 8/27 9/11 9/27 10/8
Philadelphia Vireo ** 8/15 8/27 9/12 9/29 10/10
Yellow-headed Blackbird NA 8/15 9/5 9/15 9/30 10/12
Merlin * 8/16 9/6 10/26 - -
Black-throated Green Warbler * 8/17 9/1 9/19 10/7 10/22
Northern Parula ** 8/17 8/27 9/11 9/29 10/11
Gray Catbird *** 8/18 8/30 9/11 10/1 10/14
Sora * 8/18 9/6 9/29 10/22 11/5
Swainson's Thrush *** 8/18 8/30 9/13 9/29 10/10
Blue-headed Vireo *** 8/19 9/1 9/18 10/5 10/18
Brown Thrasher *** 8/19 8/30 9/11 9/30 10/12
Western Tanager * 8/19 8/29 9/11 9/28 10/9
White-eyed Vireo * 8/19 8/28 9/10 9/29 10/11
Clay-colored Sparrow *** 8/20 9/3 9/24 10/16 10/31
Turkey Vulture *** 8/20 9/8 9/22 10/16 10/30
Yellow-breasted Chat * 8/20 8/26 9/4 9/24 10/8
American White Pelican ** 8/22 9/9 10/16 11/18 12/9
Pine Siskin * 8/23 10/11 12/28 - -
Nashville Warbler *** 8/24 9/6 9/23 10/10 10/24
House Wren ** 8/25 9/1 9/10 10/3 10/19
Osprey *** 8/25 9/7 9/24 10/11 11/12
Eastern Phoebe *** 8/27 9/9 9/23 10/14 10/29
Broad-winged Hawk * 8/28 9/7 9/20 10/7 10/19
Summer Tanager ** 8/28 9/6 9/18 10/5 10/17

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Lesser Yellowlegs ** - Before July 1 8/21 9/18 11/15
Wilson's Phalarope * - Before July 1 8/21 9/15 10/2
Stilt Sandpiper ** Before July 1 7/8 8/26 9/15 9/30
Least Sandpiper *** - 7/10 8/26 9/16 9/30
Little Blue Heron * - 7/10 8/24 9/16 10/2
Great Egret *** - 7/15 9/11 10/16 11/10
Peregrine Falcon * Before July 1 7/26 9/19 10/10 10/28
Sanderling * 7/1 7/28 9/10 10/3 10/21
Ruby-throated Hummingbird *** Before July 1 7/29 8/28 9/21 10/8
Black-bellied Plover * 7/20 7/30 9/29 11/15 11/28
Greater Yellowlegs * - 8/1 10/26 11/13 11/25
Buff-breasted Sandpiper * 7/23 8/3 8/21 9/12 9/29
Eastern Wood-Pewee ** Before July 1 8/5 8/22 9/19 10/6
Alder Flycatcher * 7/26 8/7 8/23 9/9 9/21
Yellow Warbler *** 8/1 8/12 8/26 9/17 10/1
Red-headed Woodpecker ** 7/31 8/13 8/27 9/23 10/13
Baltimore Oriole *** 8/6 8/14 8/26 9/12 9/23
White-faced Ibis * Before July 1 8/14 9/4 10/1 10/27
Blackburnian Warbler * 8/3 8/15 8/30 9/15 9/27
Blue-gray Gnatcatcher ** 8/2 8/15 8/27 9/21 10/5
Caspian Tern * 7/1 8/15 9/11 9/30 10/13
Canada Warbler * 8/6 8/17 8/30 9/14 9/24
Great Crested Flycatcher ** 8/11 8/17 8/25 9/15 9/27
Northern Waterthrush ** 8/7 8/17 8/31 9/15 9/25
Yellow-bellied Flycatcher * 8/6 8/17 9/1 9/17 9/28
Blue-winged Teal *** 8/2 8/18 9/18 10/25 11/13
Least Flycatcher *** 8/8 8/19 9/3 9/20 10/3
Olive-sided Flycatcher *** 8/9 8/19 9/2 9/18 9/29
Red-eyed Vireo *** 8/11 8/19 8/31 9/19 10/2
American Redstart *** 8/10 8/20 9/3 9/20 10/2
Black-and-white Warbler *** 8/10 8/20 9/4 9/20 10/3
Mourning Warbler * 8/10 8/20 9/3 9/18 9/29
Ovenbird ** 8/10 8/20 9/4 9/20 10/2
Yellow-throated Vireo * 8/11 8/20 9/2 9/20 10/2
Chestnut-sided Warbler * 8/11 8/21 9/5 9/20 10/2
Swainson's Hawk ** 7/28 8/21 9/7 10/4 10/21
Rose-breasted Grosbeak * 8/12 8/22 9/4 9/25 10/10
Tennessee Warbler ** 8/7 8/22 9/10 9/30 10/16
Magnolia Warbler * 8/13 8/24 9/9 9/25 10/7
Red-necked Phalarope * 7/1 8/25 9/9 9/30 10/14
Say's Phoebe * 8/12 8/25 9/7 9/28 10/11
Yellow-breasted Chat * 8/20 8/26 9/4 9/24 10/8
Blackpoll Warbler * 8/15 8/27 9/11 9/27 10/8
Northern Parula ** 8/17 8/27 9/11 9/29 10/11
Philadelphia Vireo * 8/15 8/27 9/12 9/29 10/10
White-eyed Vireo * 8/19 8/28 9/10 9/29 10/11

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Cliff Swallow *** - - Before July 1 9/2 9/25
Lark Sparrow *** - - Before July 1 9/10 9/28
Least Bittern * - - Before July 1 8/25 9/30
Marbled Godwit * - - Before July 1 9/8 10/2
Prothonotary Warbler * - - Before July 1 8/30 9/24
Snowy Plover * - - Before July 1 9/12 10/3
Tree Swallow ** - - Before July 1 9/4 11/8
Willet * - - Before July 1 9/8 10/5
Yellow-billed Cuckoo ** - - Before July 1 8/22 10/4
Western Wood-Pewee * - Before July 1 7/20 9/17 9/29
Yellow-crowned Night-Heron * - Before July 1 7/31 8/26 10/5
Killdeer *** Before July 1 7/4 8/2 11/3 11/28
Cattle Egret * - - 8/5 9/30 11/3
Upland Sandpiper *** 7/23 7/29 8/6 8/27 9/10
Black-necked Stilt * - - 8/7 9/17 10/4
Eastern Kingbird *** Before July 1 7/25 8/7 9/6 9/22
Short-billed Dowitcher * Before July 1 7/6 8/7 9/2 10/4
Spotted Sandpiper *** Before July 1 7/6 8/7 9/12 10/1
Blue Grosbeak *** 7/27 8/1 8/9 8/27 9/11
Chimney Swift *** - 7/25 8/10 10/10 10/25
Pectoral Sandpiper ** Before July 1 7/20 8/10 8/26 10/20
Green Heron ** Before July 1 7/2 8/11 9/18 10/10
Bank Swallow ** Before July 1 7/5 8/12 9/13 9/29
Baird's Sandpiper ** ]+D11 7/10 8/13 9/11 10/3
Semipalmated Sandpiper ** 7/1 7/15 8/15 9/14 10/3
Solitary Sandpiper *** Before July 1 7/6 8/16 9/12 9/28
Black Tern *** Before July 1 7/5 8/17 9/14 10/2
Lark Bunting ** - - 8/17 9/13 9/30
Mississippi Kite *** Before July 1 8/1 8/18 9/10 9/23
Snowy Egret ** Before July 1 7/5 8/18 10/2 10/24
Semipalmated Plover * 7/1 7/21 8/19 9/17 10/11
Wood Duck ** Before July 1 7/1 8/19 10/27 11/19
Bell's Vireo *** 8/5 8/11 8/20 9/11 9/24
Forster's Tern ** Before July 1 7/26 8/20 9/15 10/26
Buff-breasted Sandpiper * 7/23 8/3 8/21 9/12 9/29
Lesser Yellowlegs ** - Before July 1 8/21 9/18 11/15
Wilson's Phalarope ** - Before July 1 8/21 9/15 10/2
Eastern Wood-Pewee *** Before July 1 8/5 8/22 9/19 10/6
Alder Flycatcher * 7/26 8/7 8/23 9/9 9/21
Little Blue Heron ** - 7/10 8/24 9/16 10/2
Great Crested Flycatcher *** 8/11 8/17 8/25 9/15 9/27
Baltimore Oriole *** 8/6 8/14 8/26 9/12 9/23
Least Sandpiper *** - 7/10 8/26 9/16 9/30
Stilt Sandpiper ** Before July 1 7/8 8/26 9/15 9/30
Yellow Warbler *** 8/1 8/12 8/26 9/17 10/1
Blue-gray Gnatcatcher *** 8/2 8/15 8/27 9/21 10/5
Red-headed Woodpecker *** 7/31 8/13 8/27 9/23 10/13
Common Nighthawk *** - - 8/28 9/22 10/8
Ruby-throated Hummingbird *** Before July 1 7/29 8/28 9/21 10/8

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Dickcissel *** - - Before July 1 7/3 9/10
Northern Rough-winged Swallow ** - - Before July 1 7/15 10/19
Louisiana Waterthrush * - - Before July 1 7/25 9/1
Orchard Oriole *** - - Before July 1 7/29 9/9
Western Kingbird *** - Before July 1 7/17 8/11 9/16
Piping Plover * - - 7/26 8/12 9/24
Least Tern * - - 7/26 8/20 9/13
Purple Martin *** - 7/2 7/23 8/20 9/9
Yellow-billed Cuckoo *** - - Before July 1 8/22 10/4
Least Bittern * - - Before July 1 8/25 9/30
Pectoral Sandpiper ** Before July 1 7/20 8/10 8/26 10/20
Yellow-crowned Night-Heron * - Before July 1 7/31 8/26 10/5
Blue Grosbeak *** 7/27 8/1 8/9 8/27 9/11
Upland Sandpiper *** 7/23 7/29 8/6 8/27 9/10

West

Favorable conditions for migration will be much more widespread across the West this week, with many areas experiencing light to moderate flights. Of particular note, the Pacific Northwest will experience moderate flights where precipitation is not falling on Friday night; much of the northern half of the region will experience light to moderate flights on Monday night; and portions of the Desert Southwest and the eastern front of the Rockies will experience light to moderate flights to close the period.

Screenshot 2015-09-04 13.37.10

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black Storm-Petrel * Before July 1 8/21 9/6 10/21 11/1
Ring-billed Gull ** Before July 1 11/2 11/22 12/5 -
Sooty Shearwater * Before July 1 8/28 9/12 10/2 10/16
Long-tailed Jaeger * 7/19 8/29 9/12 10/1 10/13
Pomarine Jaeger * 7/20 8/30 9/25 10/22 11/14
South Polar Skua * 7/26 9/10 9/25 10/15 10/30
Pied-billed Grebe ** 7/27 10/18 11/11 11/29 -
Ruff * 7/27 8/26 9/10 9/27 10/9
Buller's Shearwater * 7/28 8/21 9/21 10/22 11/15
Cooper's Hawk * 8/1 9/7 10/1 11/2 11/19
Sora * 8/3 8/23 9/22 - -
Blue-winged Teal * 8/6 8/21 9/28 10/24 11/8
Brewer's Sparrow ** 8/6 8/21 9/8 9/28 10/11
Wilson's Warbler *** 8/8 8/22 9/8 9/28 10/12
Blue-gray Gnatcatcher * 8/9 8/24 9/12 9/30 10/13
Gray Flycatcher * 8/9 8/22 9/5 9/25 10/7
Northern Pintail *** 8/9 8/22 11/19 - -
Black-and-white Warbler * 8/10 8/27 10/5 10/31 11/17
American Redstart * 8/11 8/23 9/10 9/27 10/11
Cassin's Vireo * 8/11 8/22 9/6 9/25 10/8
Least Flycatcher * 8/11 8/21 9/6 9/24 10/8
Brown Thrasher * 8/12 8/21 9/5 9/21 10/6
Northern Harrier ** 8/12 10/29 11/20 - -
Orange-crowned Warbler *** 8/12 9/2 9/22 10/12 10/29
Townsend's Warbler *** 8/12 8/30 9/30 10/27 11/10
Yellow-headed Blackbird * 8/12 8/21 9/2 9/24 10/11
Hammond's Flycatcher * 8/13 8/22 9/6 9/24 10/7
Savannah Sparrow *** 8/13 8/29 9/27 10/21 11/9
Clay-colored Sparrow * 8/14 8/28 9/17 10/6 11/2
House Wren ** 8/14 8/24 9/9 9/29 11/8
Warbling Vireo *** 8/14 8/25 9/9 9/29 10/13
Belted Kingfisher *** 8/15 9/5 10/27 11/10 -
Sabine's Gull * 8/15 9/4 9/21 10/6 10/17
Western Tanager *** 8/15 8/25 9/7 9/28 10/12
Common Yellowthroat *** 8/17 8/29 9/16 10/9 10/28
Pectoral Sandpiper ** 8/17 9/1 9/20 10/11 10/28
Vesper Sparrow ** 8/17 8/30 9/15 10/3 10/17
Red-tailed Hawk *** 8/18 9/12 After Dec 31 - -
Marsh Wren ** 8/19 9/27 10/30 11/21 -
Red-shouldered Hawk ** 8/19 9/6 10/3 10/23 -
Common Tern * 8/19 9/1 9/16 10/3 10/16
Pacific-slope Flycatcher ** 8/19 8/28 9/12 10/4 10/20
Swainson's Thrush *** 8/19 8/26 9/8 9/24 10/10
Black Phoebe *** 8/20 9/6 10/30 - -
Green-tailed Towhee ** 8/21 9/1 9/14 10/1 10/12
Parasitic Jaeger * 8/21 9/4 9/20 10/8 10/22
Prairie Warbler * 8/21 9/3 9/19 10/5 10/17
Tennessee Warbler * 8/22 9/4 9/21 10/8 10/22
Sharp-shinned Hawk ** 8/23 9/9 10/22 11/8 -
Brewer's Blackbird *** 8/23 9/8 9/28 10/16 11/10
Turkey Vulture *** 8/23 9/3 9/14 10/6 10/19
Red-winged Blackbird *** 8/24 9/11 10/10 10/31 11/21
Blackburnian Warbler * 8/25 9/8 9/28 10/17 11/7
Red-throated Loon * 8/25 9/5 9/20 9/28 10/2
Bobolink * 8/25 9/6 9/22 10/8 10/21
Red-necked Grebe * 8/26 10/20 11/6 11/22 -
Chestnut-sided Warbler * 8/26 9/7 9/24 10/9 10/24
Vaux's Swift * 8/26 9/5 9/16 10/7 10/21
Blackpoll Warbler * 8/28 9/8 9/24 10/9 10/22
Prothonotary Warbler * 8/28 9/18 10/4 10/21 11/1

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
American Avocet * - Before July 1 8/31 9/28 10/20
Heermann's Gull * - Before July 1 9/16 10/7 12/1
Marbled Godwit * - Before July 1 9/2 - -
Barn Swallow *** - Before July 1 8/23 9/25 10/12
Black-necked Stilt * Before July 1 Before July 1 8/22 9/18 10/7
Franklin's Gull * Before July 1 Before July 1 9/3 10/3 11/1
Green Heron * - Before July 1 8/30 9/23 10/18
Spotted Sandpiper ** Before July 1 7/3 8/21 9/19 10/4
Short-billed Dowitcher * Before July 1 7/4 8/28 9/13 9/24
White-faced Ibis * Before July 1 7/4 8/26 9/25 10/16
Western Sandpiper *** Before July 1 7/8 8/29 9/15 10/6
Greater Yellowlegs *** Before July 1 7/10 8/30 9/14 12/11
Ruddy Turnstone * Before July 1 7/13 8/21 9/8 12/5
Semipalmated Plover *** Before July 1 7/13 8/26 9/14 9/28
California Gull * Before July 1 7/14 11/9 11/26 12/10
Least Sandpiper *** Before July 1 7/15 8/28 9/13 9/25
Stilt Sandpiper * Before July 1 7/17 8/31 9/15 9/27
Surfbird * Before July 1 7/17 9/1 - -
Sanderling * Before July 1 7/18 9/11 - -
Black Turnstone * 7/3 7/19 9/14 11/26 12/7
Wandering Tattler * Before July 1 7/20 8/24 9/24 10/16
Black-footed Albatross * Before July 1 7/21 9/12 10/11 11/5
Elegant Tern * Before July 1 7/21 9/15 10/5 11/26
Black-bellied Plover * Before July 1 7/23 10/8 - -
Fork-tailed Storm-Petrel * 7/16 7/30 8/23 10/7 10/23
Lark Bunting * 7/25 8/4 8/21 9/9 9/26
Hermit Warbler * 7/28 8/6 8/22 9/7 10/26
Arctic Tern * 7/18 8/8 9/5 9/30 10/17
Lesser Yellowlegs ** Before July 1 8/9 8/26 9/14 10/20
Red-breasted Nuthatch ** 7/29 8/10 9/2 10/28 11/14
Solitary Sandpiper * 7/25 8/11 8/26 9/14 9/27
Baird's Sandpiper ** 7/30 8/13 8/29 9/15 9/29
Black-throated Gray Warbler * 7/30 8/13 9/30 10/22 11/4
Osprey * 8/4 8/14 8/26 9/16 10/18
Virginia's Warbler * 8/3 8/14 8/27 9/17 10/2
Pink-footed Shearwater * Before July 1 8/15 9/15 10/19 11/12
Cinnamon Teal * 7/31 8/16 9/5 9/28 10/14
Nashville Warbler ** 8/2 8/16 9/4 9/23 10/12
Red-necked Phalarope *** 8/2 8/16 9/1 9/19 10/5
American White Pelican * Before July 1 8/17 9/1 9/26 12/11
Ashy Storm-Petrel * Before July 1 8/18 9/11 10/8 10/26
Red-headed Woodpecker * 8/8 8/18 8/31 9/15 9/26
Buff-breasted Sandpiper * 8/9 8/19 9/2 9/16 9/26
Gray Catbird * 8/10 8/19 8/31 9/19 10/2
Killdeer *** 8/4 8/19 9/8 9/30 11/20
MacGillivray's Warbler *** 8/8 8/19 9/4 9/23 10/7
Red-eyed Vireo * 8/11 8/19 8/30 9/17 9/29
Yellow Warbler *** 8/5 8/19 9/8 10/3 10/21
Chipping Sparrow * 8/7 8/20 9/8 10/11 11/5
Green-winged Teal ** 8/7 8/20 11/21 - -
Northern Shoveler *** 8/5 8/20 11/22 - -
Northern Waterthrush * 8/9 8/20 9/4 9/19 10/3
Willow Flycatcher ** 8/9 8/20 9/3 9/23 10/7
Black Storm-Petrel * Before July 1 8/21 9/6 10/21 11/1
Blue-winged Teal * 8/6 8/21 9/28 10/24 11/8
Brewer's Sparrow * 8/6 8/21 9/8 9/28 10/11
Brown Thrasher * 8/12 8/21 9/5 9/21 10/6
Buller's Shearwater * 7/28 8/21 9/21 10/22 11/15
Least Flycatcher * 8/11 8/21 9/6 9/24 10/8
Yellow-headed Blackbird * 8/12 8/21 9/2 9/24 10/11
Cassin's Vireo * 8/11 8/22 9/6 9/25 10/8
Gray Flycatcher * 8/9 8/22 9/5 9/25 10/7
Hammond's Flycatcher * 8/13 8/22 9/6 9/24 10/7
Northern Pintail ** 8/9 8/22 11/19 - -
Wilson's Warbler *** 8/8 8/22 9/8 9/28 10/12
American Redstart * 8/11 8/23 9/10 9/27 10/11
Sora * 8/3 8/23 9/22 - -
Blue-gray Gnatcatcher * 8/9 8/24 9/12 9/30 10/13
House Wren ** 8/14 8/24 9/9 9/29 11/8
Warbling Vireo *** 8/14 8/25 9/9 9/29 10/13
Western Tanager *** 8/15 8/25 9/7 9/28 10/12
Ruff * 7/27 8/26 9/10 9/27 10/9
Swainson's Thrush ** 8/19 8/26 9/8 9/24 10/10
Black-and-white Warbler * 8/10 8/27 10/5 10/31 11/17
Clay-colored Sparrow * 8/14 8/28 9/17 10/6 11/2
Pacific-slope Flycatcher ** 8/19 8/28 9/12 10/4 10/20
Sooty Shearwater * Before July 1 8/28 9/12 10/2 10/16

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black-headed Grosbeak *** - - Before July 1 9/2 9/30
Northern Rough-winged Swallow ** - - Before July 1 9/10 9/27
Olive-sided Flycatcher * - - Before July 1 9/19 10/3
Black Skimmer * - Before July 1 7/12 8/23 9/16
Western Kingbird *** - - 7/13 9/10 9/26
Plumbeous Vireo * - - 7/15 9/22 10/6
Hooded Oriole * - Before July 1 7/22 8/21 9/20
Lesser Nighthawk * - Before July 1 7/23 8/26 9/14
Calliope Hummingbird * - Before July 1 7/27 9/3 9/23
Summer Tanager * - - 7/27 10/3 10/15
Bell's Vireo * - Before July 1 7/28 9/26 10/12
Broad-tailed Hummingbird ** - Before July 1 7/28 9/3 9/26
Yellow-billed Cuckoo * - Before July 1 7/28 8/28 9/19
White-winged Dove ** - Before July 1 7/29 8/27 9/19
Blue Grosbeak ** Before July 1 7/1 7/31 9/16 10/12
Caspian Tern ** - Before July 1 7/31 9/6 9/24
Rufous Hummingbird *** Before July 1 7/1 8/1 9/8 9/25
Purple Martin * - Before July 1 8/3 9/7 9/22
Broad-billed Hummingbird * Before July 1 7/16 8/4 8/22 9/6
Common Nighthawk ** - - 8/4 9/1 9/22
Grace's Warbler * Before July 1 7/22 8/4 9/2 9/20
Mississippi Kite * - Before July 1 8/4 9/6 10/1
Pigeon Guillemot * Before July 1 7/19 8/4 8/27 9/13
Sulphur-bellied Flycatcher * Before July 1 7/21 8/4 8/22 9/3
Whimbrel * Before July 1 7/10 8/5 10/3 -
Blue-throated Hummingbird * Before July 1 7/19 8/5 8/22 9/3
Red-faced Warbler * - - 8/5 8/25 9/7
Western Wood-Pewee *** - - 8/7 9/26 10/12
Black-chinned Hummingbird *** Before July 1 7/16 8/9 9/13 10/4
Zone-tailed Hawk * Before July 1 7/17 8/9 9/23 10/11
Snowy Plover * Before July 1 7/4 8/10 9/9 10/4
Eastern Kingbird ** 7/24 8/1 8/11 9/2 9/16
Wilson's Phalarope ** Before July 1 7/13 8/11 9/11 10/3
Swainson's Hawk ** - 7/26 8/14 9/27 10/13
Upland Sandpiper * 7/26 8/2 8/14 8/29 9/10
Black Tern * Before July 1 7/24 8/15 9/24 10/8
Mourning Dove *** - Before July 1 8/17 9/22 10/8
Bank Swallow * - Before July 1 8/18 9/12 9/28
Lark Sparrow ** 7/21 8/1 8/19 9/19 10/5
Semipalmated Sandpiper * Before July 1 7/31 8/19 9/9 9/22
Lazuli Bunting ** 8/5 8/11 8/20 9/17 10/10
Lark Bunting * 7/25 8/4 8/21 9/9 9/26
Ruddy Turnstone * Before July 1 7/13 8/21 9/8 12/5
Spotted Sandpiper *** Before July 1 7/3 8/21 9/19 10/4
Black-necked Stilt ** Before July 1 7/1 8/22 9/18 10/7
Hermit Warbler * 7/28 8/6 8/22 9/7 10/26
Barn Swallow *** - Before July 1 8/23 9/25 10/12
Fork-tailed Storm-Petrel * 7/16 7/30 8/23 10/7 10/23
Wandering Tattler * Before July 1 7/20 8/24 9/24 10/16
Lesser Yellowlegs ** Before July 1 8/9 8/26 9/14 10/20
Osprey ** 8/4 8/14 8/26 9/16 10/18
Semipalmated Plover ** Before July 1 7/13 8/26 9/14 9/28
Solitary Sandpiper ** 7/25 8/11 8/26 9/14 9/27
White-faced Ibis ** Before July 1 7/4 8/26 9/25 10/16
Virginia's Warbler * 8/3 8/14 8/27 9/17 10/2
Least Sandpiper *** Before July 1 7/15 8/28 9/13 9/25
Short-billed Dowitcher * Before July 1 7/4 8/28 9/13 9/24

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black Swift * - - Before July 1 7/3 9/25
Bullock's Oriole ** - - Before July 1 7/20 9/15
Tree Swallow *** - - Before July 1 7/25 9/13
Violet-green Swallow ** - - Before July 1 7/26 10/15
Lucy's Warbler * - - Before July 1 7/27 10/16
Yellow-breasted Chat * - - Before July 1 7/28 9/29
Gull-billed Tern * - - Before July 1 8/1 9/13
Brown-crested Flycatcher ** - - 7/20 8/8 8/22
Cliff Swallow *** - - Before July 1 8/9 9/14
Scott's Oriole * - Before July 1 7/15 8/10 8/24
Indigo Bunting * - Before July 1 7/21 8/11 10/2
Least Tern * - Before July 1 7/15 8/12 8/29
Hooded Oriole ** - Before July 1 7/22 8/21 9/20
Broad-billed Hummingbird * Before July 1 7/16 8/4 8/22 9/6
Blue-throated Hummingbird * Before July 1 7/19 8/5 8/22 9/3
Sulphur-bellied Flycatcher * Before July 1 7/21 8/4 8/22 9/3
Black Skimmer * - Before July 1 7/12 8/23 9/16
Red-faced Warbler * - - 8/5 8/25 9/7
Lesser Nighthawk * - Before July 1 7/23 8/26 9/14
White-winged Dove *** - Before July 1 7/29 8/27 9/19
Pigeon Guillemot * Before July 1 7/19 8/4 8/27 9/13
Yellow-billed Cuckoo * - Before July 1 7/28 8/28 9/19

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Farnsworth and Van Doren

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