Regional Migration Forecast: 1-8 September 2017

Gray Catbird. Max McCarthy/Macaulay Library. eBird S38503313.

Continental Summary

Pulses of early and mid period favorable migration conditions will bring similarly time pulses of moderate flights to many areas of the West featuring American White Pelican, Killdeer, Elegant Tern, Cassin’s Vireo, Yellow Warbler, and MacGillivray’s Warbler, while a significant mid period cold front will spawn moderate to very heavy flights in the East featuring Buff-breasted Sandpiper, Common Nighthawk, Least Flycatcher, Olive-sided Flycatcher, Warbling Vireo, numerous warblers, and Bobolink. As the remnants of Harvey plod through the eastern US early in the period, a new and currently strong tropical system (Irma) will be approaching the southeastern US by the end of the period; BirdCast will be watching closely.

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.

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Please note that photographs and other digital media showing birds come from the Macaulay Library, which receives credit along with the photographer/observer in the media caption as part of a new initiative that allows public contribution, access and use of natural history media.

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

Moderate to heavy flights will kick off the weekend in many areas, but they will become increasingly restricted by Sunday and Monday; the remnants of Hurricane Harvey and some significant southerly flow will keep many birds out of the skies in many areas. But a strong frontal boundary following Harvey’s remnants will bring a fresh set of favorable migration conditions by Monday night, particularly in the Upper Midwest, where moderate to locally very heavy flights will occur. As this frontal boundary pushes east, these intense movements will spread toward the coast, reaching their greatest extents on Wednesday night. By Thursday and Friday more variable conditions will be apparent, in part due to the approach of Hurricane Irma; moderate and heavy flights are still likely, but most of these flights will be away from the immediate coast.

Bobolink. Tim Lenz/Macaulay Library. eBird S38810278.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Northern Harrier ** 8/2 10/9 10/21 11/2 11/13
Cooper's Hawk *** 8/2 9/7 10/11 10/28 11/8
Bald Eagle ** 8/2 9/5 9/17 9/26 10/1
Peregrine Falcon * 8/2 9/23 10/4 10/17 10/28
Northern Shoveler ** 8/9 10/12 11/8 After Nov 30 -
Red-breasted Nuthatch ** 8/12 9/4 10/2 10/17 After Nov 30
Green-winged Teal ** 8/13 10/11 10/24 After Nov 30 -
Blue Jay ****! 8/23 9/8 9/28 10/30 11/26
Nashville Warbler *** 8/23 9/3 9/20 10/10 10/22
Black-throated Blue Warbler *** 8/23 9/2 9/25 10/14 10/23
Pine Warbler *** 8/23 9/4 9/21 10/12 10/26
Common Yellowthroat *** 8/24 9/2 9/17 10/9 10/23
Black-throated Green Warbler *** 8/24 9/7 9/21 10/6 10/17
Scarlet Tanager *** 8/24 9/3 9/15 10/1 10/12
Cape May Warbler *** 8/25 9/4 9/18 10/2 10/15
Red-shouldered Hawk ** 8/26 9/5 9/21 11/10 11/19
Merlin *** 8/26 9/4 9/20 10/26 11/6
Bay-breasted Warbler *** 8/26 9/4 9/15 9/28 10/8
Philadelphia Vireo *** 8/27 9/5 9/16 9/28 10/7
Swainson's Thrush *** 8/27 9/5 9/17 9/30 10/14
Summer Tanager * 8/27 9/7 9/17 10/2 10/12
Turkey Vulture *** 8/28 9/6 9/19 10/27 After Nov 30
Gray Catbird *** 8/28 9/8 9/18 10/9 10/22
Northern Parula *** 8/28 9/7 9/20 10/4 10/15
Blackpoll Warbler *** 8/28 9/7 9/22 10/8 10/23
American Kestrel *** 8/29 9/6 9/26 10/22 11/2
Northern Flicker ****! 8/30 9/12 9/25 10/10 10/30
House Wren *** 8/30 9/5 9/15 10/7 10/21
Brown Thrasher *** 8/30 9/9 9/21 10/4 10/17
Rose-breasted Grosbeak *** 8/30 9/7 9/17 9/30 10/9
Sharp-shinned Hawk *** 8/31 9/10 10/17 10/30 After Nov 30
Broad-winged Hawk *** 8/31 9/8 9/18 9/29 10/7
Gray-cheeked Thrush *** 9/2 9/11 9/23 10/5 10/14
Palm Warbler *** 9/2 9/21 10/6 10/21 11/1
Pied-billed Grebe *** 9/4 10/11 10/31 11/20 After Nov 30
Northern Pintail ** 9/5 10/12 10/27 11/7 After Nov 30
Great Cormorant * 9/5 11/16 After Nov 30 - -
Marsh Wren * 9/7 9/19 9/30 10/17 10/29
Blue-headed Vireo *** 9/8 9/21 10/4 10/19 10/31
Eastern Phoebe ****! 9/9 9/18 9/30 10/18 11/3

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Sanderling * - 8/2 9/2 9/22 10/4
Belted Kingfisher ** - 8/2 9/19 10/16 10/29
Prairie Warbler * - 8/2 9/10 9/25 10/7
Blue-winged Teal ** 8/2 8/19 9/7 10/22 11/5
Bobolink ** 8/2 8/19 9/2 9/16 10/19
Sora * 8/12 8/21 9/24 10/12 10/25
Least Flycatcher ** 8/11 8/21 9/3 9/21 10/4
Buff-breasted Sandpiper ** 8/16 8/23 9/3 9/14 9/22
Blackburnian Warbler ** 8/12 8/23 9/8 9/26 10/7
Yellow-bellied Flycatcher * 8/13 8/24 9/6 9/20 9/30
Red-eyed Vireo *** 8/15 8/24 9/7 9/28 10/11
American Golden-Plover ** 8/16 8/26 9/9 9/22 10/16
Chestnut-sided Warbler *** 8/14 8/26 9/9 9/25 10/6
Warbling Vireo *** 8/19 8/27 9/5 9/17 9/25
Veery ** 8/19 8/28 9/7 9/19 9/28
Wood Thrush ** 8/22 8/28 9/12 10/1 10/12
Golden-winged Warbler * 8/18 8/28 9/8 9/20 9/29
Yellow-throated Vireo *** 8/21 8/29 9/9 9/22 10/2
Ovenbird ** 8/15 8/29 9/12 9/30 10/12
Black-and-white Warbler *** 8/2 8/29 9/13 9/30 10/11
Tennessee Warbler *** 8/17 8/29 9/15 10/4 10/19
White-eyed Vireo *** 8/23 8/31 9/10 9/23 10/3
Northern Waterthrush ** 8/2 8/31 9/10 9/24 10/9
Hooded Warbler * 8/23 8/31 9/10 9/24 10/5
American Redstart *** 8/20 8/31 9/12 9/26 10/8
Wilson's Warbler *** 8/22 8/31 9/11 9/23 10/2
Red-headed Woodpecker * 8/23 9/1 9/11 9/27 10/13
Magnolia Warbler *** 8/20 9/1 9/16 10/2 10/13
Common Yellowthroat *** 8/24 9/2 9/17 10/9 10/23
Black-throated Blue Warbler *** 8/23 9/2 9/25 10/14 10/23
Nashville Warbler *** 8/23 9/3 9/20 10/10 10/22
Scarlet Tanager *** 8/24 9/3 9/15 10/1 10/12
Merlin *** 8/26 9/4 9/20 10/26 11/6
Red-breasted Nuthatch ** 8/12 9/4 10/2 10/17 After Nov 30
Cape May Warbler *** 8/25 9/4 9/18 10/2 10/15
Bay-breasted Warbler *** 8/26 9/4 9/15 9/28 10/8
Pine Warbler ** 8/23 9/4 9/21 10/12 10/26
Bald Eagle *** 8/2 9/5 9/17 9/26 10/1
Red-shouldered Hawk ** 8/26 9/5 9/21 11/10 11/19
Philadelphia Vireo *** 8/27 9/5 9/16 9/28 10/7
House Wren ** 8/30 9/5 9/15 10/7 10/21
Swainson's Thrush *** 8/27 9/5 9/17 9/30 10/14
Turkey Vulture *** 8/28 9/6 9/19 10/27 After Nov 30
American Kestrel ** 8/29 9/6 9/26 10/22 11/2
Cooper's Hawk ** 8/2 9/7 10/11 10/28 11/8
Northern Parula *** 8/28 9/7 9/20 10/4 10/15
Blackpoll Warbler *** 8/28 9/7 9/22 10/8 10/23
Black-throated Green Warbler *** 8/24 9/7 9/21 10/6 10/17
Summer Tanager * 8/27 9/7 9/17 10/2 10/12
Rose-breasted Grosbeak *** 8/30 9/7 9/17 9/30 10/9
Broad-winged Hawk *** 8/31 9/8 9/18 9/29 10/7
Blue Jay *** 8/23 9/8 9/28 10/30 11/26
Gray Catbird *** 8/28 9/8 9/18 10/9 10/22
Brown Thrasher *** 8/30 9/9 9/21 10/4 10/17

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Killdeer *** - - Before Aug 1 10/25 11/24
Spotted Sandpiper *** - - Before Aug 1 9/3 9/18
Whimbrel * - - Before Aug 1 9/19 10/3
Yellow-crowned Night-Heron * - 8/2 8/6 10/10 10/28
Yellow-billed Cuckoo * - 8/2 8/6 9/28 10/12
Tree Swallow *** - 8/2 8/9 10/25 11/6
Ruddy Turnstone * - 8/2 8/10 9/2 9/25
Snowy Egret ** - 8/2 8/11 10/17 10/31
Green Heron *** - 8/2 8/12 9/16 10/5
Great Egret *** - 8/2 8/13 10/22 11/5
Solitary Sandpiper *** - 8/2 8/13 9/11 9/30
Laughing Gull ** - 8/2 8/14 After Nov 30 -
Great Blue Heron *** - 8/2 8/15 10/20 After Nov 30
Osprey *** - 8/2 8/15 10/19 11/4
Forster's Tern * - 8/2 8/16 9/26 After Nov 30
Short-billed Dowitcher *** 8/2 8/11 8/17 9/4 9/14
Cedar Waxwing *** - 8/2 8/17 9/25 After Nov 30
Semipalmated Plover *** - 8/2 8/18 9/11 9/28
Chimney Swift *** 8/9 8/14 8/18 10/11 10/20
Lesser Yellowlegs *** - 8/2 8/19 9/5 9/24
Least Sandpiper *** - 8/2 8/19 9/8 9/22
Greater Yellowlegs ** - 8/2 8/20 11/11 After Nov 30
Semipalmated Sandpiper *** 8/2 8/7 8/20 9/6 9/20
Caspian Tern ** - 8/2 8/20 9/12 10/22
Baltimore Oriole *** - 8/2 8/20 9/3 9/13
Wood Duck ** - 8/2 8/21 11/2 11/22
Royal Tern * - 8/2 8/21 11/8 After Nov 30
Pectoral Sandpiper ** 8/11 8/17 8/23 9/7 11/13
Black Tern ** 8/7 8/16 8/25 9/7 9/18
Stilt Sandpiper ** 8/12 8/18 8/26 9/8 9/18
Blue-gray Gnatcatcher *** 8/2 8/12 8/26 9/15 9/27
White-rumped Sandpiper * - 8/2 8/27 9/15 9/22
Great Crested Flycatcher *** 8/15 8/21 8/27 9/14 9/24
Red Knot * 8/11 8/19 8/28 9/10 9/22
Western Sandpiper * 8/13 8/19 8/28 9/9 9/20
Blue-winged Warbler ** - 8/2 8/28 9/15 9/26
Common Nighthawk *** 8/13 8/20 8/29 9/8 9/15
Eastern Wood-Pewee *** 8/7 8/18 8/29 9/24 10/9
Canada Warbler ** 8/2 8/18 8/29 9/11 9/24
Baird's Sandpiper ** 8/12 8/20 8/30 9/10 9/19
Olive-sided Flycatcher * 8/2 8/18 8/30 9/12 9/25
Ruby-throated Hummingbird *** - 8/2 8/31 9/21 10/3
Sanderling ** - 8/2 9/2 9/22 10/4
Bobolink ** 8/2 8/19 9/2 9/16 10/19
Buff-breasted Sandpiper ** 8/16 8/23 9/3 9/14 9/22
Least Flycatcher ** 8/11 8/21 9/3 9/21 10/4
Warbling Vireo *** 8/19 8/27 9/5 9/17 9/25
Yellow-bellied Flycatcher * 8/13 8/24 9/6 9/20 9/30
Blue-winged Teal ** 8/2 8/19 9/7 10/22 11/5
Red-eyed Vireo *** 8/15 8/24 9/7 9/28 10/11
Veery *** 8/19 8/28 9/7 9/19 9/28
Golden-winged Warbler * 8/18 8/28 9/8 9/20 9/29
Blackburnian Warbler *** 8/12 8/23 9/8 9/26 10/7
American Golden-Plover * 8/16 8/26 9/9 9/22 10/16
Yellow-throated Vireo *** 8/21 8/29 9/9 9/22 10/2
Chestnut-sided Warbler *** 8/14 8/26 9/9 9/25 10/6

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black Skimmer * - - Before Aug 1 8/3 10/28
Yellow Warbler *** - - Before Aug 1 8/10 9/24
Orchard Oriole * - - Before Aug 1 8/21 9/6
Least Tern ** - - Before Aug 1 8/22 9/6
Purple Martin *** - - Before Aug 1 8/22 9/7
Glossy Ibis * - - Before Aug 1 8/23 9/24
American Oystercatcher * - 8/2 8/4 8/23 9/26
Common Tern *** - - Before Aug 1 8/24 9/30
Little Blue Heron * - 8/2 8/9 8/25 10/24
Black-crowned Night-Heron * - 8/2 8/9 8/25 10/27
Northern Rough-winged Swallow ** - - Before Aug 1 8/25 10/25
Eastern Kingbird *** - 8/2 8/9 8/26 9/7
Black-bellied Plover * - 8/2 8/18 8/27 After Nov 30
Willet ** - 8/2 8/11 8/28 9/14
Bank Swallow *** - 8/2 8/5 8/28 9/12
Barn Swallow *** - 8/2 8/9 8/28 9/13
Cliff Swallow ** - - Before Aug 1 8/29 9/17
Blue Grosbeak * - - Before Aug 1 8/31 10/17
Ruddy Turnstone ** - 8/2 8/10 9/2 9/25
Spotted Sandpiper *** - - Before Aug 1 9/3 9/18
Baltimore Oriole *** - 8/2 8/20 9/3 9/13
Short-billed Dowitcher *** 8/2 8/11 8/17 9/4 9/14
Lesser Yellowlegs *** - 8/2 8/19 9/5 9/24
Semipalmated Sandpiper *** 8/2 8/7 8/20 9/6 9/20
Pectoral Sandpiper ** 8/11 8/17 8/23 9/7 11/13
Black Tern ** 8/7 8/16 8/25 9/7 9/18
Stilt Sandpiper ** 8/12 8/18 8/26 9/8 9/18
Least Sandpiper *** - 8/2 8/19 9/8 9/22
Common Nighthawk *** 8/13 8/20 8/29 9/8 9/15
Western Sandpiper * 8/13 8/19 8/28 9/9 9/20

Gulf Coast and Southeast

As many areas begin to dry (at least in the sky) after last week’s unprecedented torrential inundation, migrants mostly face marginal migration conditions; light to locally moderate flights will be the norm in most areas from Friday through Wednesday. However, Wednesday night sees the arrival of a significant cold front, spawning heavy and very heavy flights mostly west of the Mississippi River Valley. By Thursday night these intense flights spread farther east as the frontal boundary reaches Florida and the Carolinas. Hurricane Irma approaches the region by Friday, but its path remains uncertain relative to the strong frontal boundary forecast to sit on the Atlantic Coast; migrants will continue in moderate to heavy flights from Texas east to Appalachia.

Common Nighthawk. James Rieman/Macaulay Library. eBird S38427604.

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Great Blue Heron *** 8/2 11/5 11/16 After Nov 30 -
Cooper's Hawk ** 8/2 9/21 10/17 After Nov 30 -
American Avocet * 8/2 10/22 11/7 After Nov 30 -
Yellow-bellied Flycatcher * 8/2 9/4 9/16 10/1 10/11
Least Flycatcher ** 8/2 9/2 9/12 9/24 10/5
Yellow-throated Warbler ** 8/2 9/3 9/25 10/20 11/4
Prairie Warbler ** 8/2 9/7 9/22 10/14 11/3
Northern Parula *** 8/11 9/2 9/19 10/24 11/4
Belted Kingfisher *** 8/13 9/18 10/22 After Nov 30 -
Northern Waterthrush *** 8/15 9/7 9/20 10/3 10/13
Red-eyed Vireo *** 8/20 9/3 9/17 10/8 10/24
White-eyed Vireo *** 8/21 9/2 9/19 10/13 10/28
Blue-winged Warbler ** 8/21 9/2 9/15 9/29 10/10
Bobolink ** 8/21 9/2 9/20 10/13 10/26
Red-headed Woodpecker ** 8/22 9/4 9/18 10/26 11/5
Black-and-white Warbler *** 8/22 9/5 9/22 10/25 11/5
Chimney Swift *** 8/23 9/5 9/21 10/11 10/22
Chestnut-sided Warbler *** 8/23 9/6 9/22 10/9 10/23
Ovenbird *** 8/26 9/11 9/25 10/25 11/5
Blackburnian Warbler *** 8/26 9/5 9/18 10/3 10/28
Baltimore Oriole *** 8/26 9/2 9/12 9/23 10/1
Wilson's Warbler *** 8/27 9/4 9/17 9/29 10/16
Black Vulture ** 8/28 9/30 11/18 After Nov 30 -
Warbling Vireo ** 8/28 9/6 9/17 9/29 10/8
Cedar Waxwing * 8/28 9/6 9/18 9/29 10/7
Black-throated Green Warbler *** 8/28 9/6 10/10 10/25 11/6
Sora * 8/29 9/21 11/7 11/17 After Nov 30
Nashville Warbler *** 8/30 9/11 10/4 10/24 11/12
Scarlet Tanager *** 8/30 9/12 9/28 10/14 10/25
Veery *** 8/31 9/8 9/20 10/1 10/10
Tennessee Warbler *** 8/31 9/11 10/3 10/23 11/3
American Redstart ****! 8/31 9/12 9/26 10/19 11/2
Magnolia Warbler *** 8/31 9/13 10/1 10/19 10/31
Black-throated Blue Warbler *** 8/31 9/11 10/11 10/27 11/5
Common Yellowthroat *** 9/1 9/17 10/6 10/21 11/2
Brown Thrasher *** 9/2 9/22 10/6 10/21 11/3
Clay-colored Sparrow * 9/2 9/16 10/4 10/21 11/6
Bald Eagle *** 9/3 9/15 11/21 After Nov 30 -
Blue-headed Vireo ** 9/3 10/15 10/31 11/8 11/14
Cape May Warbler *** 9/3 9/12 9/25 10/28 11/5
Broad-winged Hawk *** 9/6 9/15 9/25 10/6 10/16
Northern Mockingbird ****! 9/7 9/23 10/10 10/26 11/22
Sharp-shinned Hawk *** 9/8 9/24 10/28 11/15 After Nov 30
Merlin *** 9/8 9/18 10/9 11/2 11/16
Scissor-tailed Flycatcher ** 9/8 9/23 10/7 11/3 11/23
Swainson's Thrush *** 9/8 9/17 9/29 10/13 10/23

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Swainson's Hawk * - 8/2 10/2 10/16 10/28
Black-bellied Plover * - 8/2 10/31 After Nov 30 -
Caspian Tern * - 8/2 11/7 After Nov 30 -
Olive-sided Flycatcher * - 8/2 9/6 9/24 10/4
Yellow Warbler *** - 8/2 9/8 9/30 10/13
Kentucky Warbler * 8/2 8/13 9/4 9/25 10/6
Hooded Warbler ** 8/8 8/20 9/20 10/5 10/29
Great Crested Flycatcher *** 8/15 8/23 9/2 9/19 10/1
Worm-eating Warbler ** 8/11 8/23 9/16 10/1 10/10
Yellow-breasted Chat ** 8/17 8/25 9/7 9/23 10/7
Blue-winged Teal * 8/8 8/26 11/8 11/29 After Nov 30
Buff-breasted Sandpiper * 8/18 8/27 9/4 9/17 9/25
Common Nighthawk ** 8/21 8/27 9/3 9/16 9/24
Canada Warbler ** 8/17 8/27 9/8 9/22 10/4
Cave Swallow * 8/2 8/28 9/4 9/16 11/21
Ruby-throated Hummingbird *** 8/13 8/29 9/13 10/4 10/19
Blue-gray Gnatcatcher *** 8/2 8/29 9/12 9/26 10/15
Dickcissel * 8/21 8/29 9/5 9/20 10/25
Mourning Warbler ** 8/21 8/30 9/11 9/22 10/2
Yellow-throated Vireo ** 8/17 8/31 9/15 9/30 10/13
Eastern Wood-Pewee *** 8/19 9/1 9/17 10/17 11/2
Acadian Flycatcher ** 8/21 9/1 9/15 10/2 10/16
Pine Warbler *** 8/15 9/1 10/9 10/26 11/3
Summer Tanager *** 8/21 9/1 9/15 10/1 10/18
Least Flycatcher ** 8/2 9/2 9/12 9/24 10/5
White-eyed Vireo *** 8/21 9/2 9/19 10/13 10/28
Blue-winged Warbler ** 8/21 9/2 9/15 9/29 10/10
Northern Parula *** 8/11 9/2 9/19 10/24 11/4
Baltimore Oriole *** 8/26 9/2 9/12 9/23 10/1
Bobolink * 8/21 9/2 9/20 10/13 10/26
Red-eyed Vireo *** 8/20 9/3 9/17 10/8 10/24
Yellow-throated Warbler ** 8/2 9/3 9/25 10/20 11/4
Red-headed Woodpecker * 8/22 9/4 9/18 10/26 11/5
Yellow-bellied Flycatcher * 8/2 9/4 9/16 10/1 10/11
Wilson's Warbler *** 8/27 9/4 9/17 9/29 10/16
Chimney Swift *** 8/23 9/5 9/21 10/11 10/22
Black-and-white Warbler *** 8/22 9/5 9/22 10/25 11/5
Blackburnian Warbler ** 8/26 9/5 9/18 10/3 10/28
Warbling Vireo * 8/28 9/6 9/17 9/29 10/8
Cedar Waxwing * 8/28 9/6 9/18 9/29 10/7
Chestnut-sided Warbler *** 8/23 9/6 9/22 10/9 10/23
Black-throated Green Warbler ** 8/28 9/6 10/10 10/25 11/6
Northern Waterthrush *** 8/15 9/7 9/20 10/3 10/13
Prairie Warbler ** 8/2 9/7 9/22 10/14 11/3
Veery *** 8/31 9/8 9/20 10/1 10/10

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Cattle Egret ** - - Before Aug 1 10/3 10/18
Green Heron *** - - Before Aug 1 9/18 10/8
Yellow-crowned Night-Heron * - - Before Aug 1 10/8 10/23
Least Tern ** - - Before Aug 1 9/3 9/17
Black-chinned Hummingbird * - - Before Aug 1 9/21 10/10
Eastern Kingbird *** - - Before Aug 1 9/22 10/5
Cliff Swallow ** - - Before Aug 1 9/14 10/18
Orchard Oriole * - - Before Aug 1 9/14 9/30
Gray Kingbird * - - Before Aug 1 9/17 10/11
Barn Swallow *** - 8/2 8/10 9/9 11/14
Louisiana Waterthrush * - 8/2 8/13 9/6 9/30
Wilson's Plover * - 8/2 8/14 9/3 9/23
Stilt Sandpiper * - 8/2 8/14 9/17 9/27
Pectoral Sandpiper * - 8/2 8/16 9/19 9/30
Spotted Sandpiper *** - 8/2 8/18 9/10 9/22
Common Tern * - 8/2 8/18 9/30 11/10
Upland Sandpiper ** - 8/2 8/19 9/11 9/24
Sanderling * - 8/2 8/19 9/3 9/16
Semipalmated Plover ** - 8/2 8/20 9/17 9/27
Piping Plover * - 8/2 8/20 After Nov 30 -
Solitary Sandpiper ** 8/13 8/16 8/20 9/11 9/23
Short-billed Dowitcher * - 8/2 8/22 9/6 9/21
Wilson's Phalarope * - 8/2 8/23 9/14 10/2
Black Tern *** 8/2 8/6 8/24 9/10 9/26
Least Sandpiper *** - 8/2 8/25 9/15 After Nov 30
Semipalmated Sandpiper ** 8/2 8/13 8/26 9/14 9/28
Prothonotary Warbler * 8/2 8/15 8/29 9/24 10/6
Baird's Sandpiper * 8/2 8/19 8/30 9/17 9/28
Western Sandpiper ** 8/2 8/17 8/31 9/15 After Nov 30
Bank Swallow ** 8/14 8/21 8/31 9/12 9/22
Great Crested Flycatcher *** 8/15 8/23 9/2 9/19 10/1
Common Nighthawk *** 8/21 8/27 9/3 9/16 9/24
Buff-breasted Sandpiper ** 8/18 8/27 9/4 9/17 9/25
Cave Swallow * 8/2 8/28 9/4 9/16 11/21
Kentucky Warbler * 8/2 8/13 9/4 9/25 10/6
Dickcissel * 8/21 8/29 9/5 9/20 10/25
Olive-sided Flycatcher * - 8/2 9/6 9/24 10/4
Yellow-breasted Chat ** 8/17 8/25 9/7 9/23 10/7
Yellow Warbler *** - 8/2 9/8 9/30 10/13
Canada Warbler ** 8/17 8/27 9/8 9/22 10/4

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Purple Martin *** - - Before Aug 1 8/3 9/10
Western Kingbird ** - - Before Aug 1 8/14 9/8
Blue Grosbeak ** - - Before Aug 1 8/24 10/28
Sandwich Tern * - 8/2 8/16 8/27 After Nov 30
Ruddy Turnstone ** - 8/2 8/17 8/28 9/7
Mississippi Kite *** - 8/2 8/10 8/29 9/8
Black Skimmer ** - 8/2 8/14 8/30 9/11
Wilson's Plover * - 8/2 8/14 9/3 9/23
Sanderling * - 8/2 8/19 9/3 9/16
Least Tern *** - - Before Aug 1 9/3 9/17
Short-billed Dowitcher * - 8/2 8/22 9/6 9/21
Louisiana Waterthrush * - 8/2 8/13 9/6 9/30
Barn Swallow *** - 8/2 8/10 9/9 11/14

Great Plains

Scattered moderate to locally heavy flights punctuate the airspace above the region for the first days of the period; but a change comes on Monday, with the arrival of northerly flow that will spawn moderate to very heavy flights on Monday night. These flights occur mostly in northern and central Plains before expanding across the region on Tuesday night. As more marginal conditions approach, lower intensity flights occur on Wednesday night and continue to decrease in extent and intensity as the period comes to an end.

Olive-sided Flycatcher. Kevin Groeneweg/Macaulay Library. eBird S38782681.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
American White Pelican ** 8/2 9/8 10/18 After Nov 30 -
Turkey Vulture *** 8/2 9/4 9/27 10/16 10/25
Cooper's Hawk *** 8/2 9/5 9/24 10/24 11/8
Red-shouldered Hawk * 8/2 9/7 9/29 10/28 11/25
Wilson's Snipe * 8/2 10/3 10/18 11/3 11/16
Peregrine Falcon * 8/2 9/13 9/24 10/9 10/23
Gray Catbird *** 8/2 9/4 9/13 10/1 10/13
Western Meadowlark ** 8/2 9/9 10/15 10/29 11/7
Purple Finch * 8/2 10/27 After Nov 30 - -
American Golden-Plover * 8/12 9/22 9/30 10/12 11/16
Merlin * 8/19 9/6 10/24 11/8 11/24
Black-throated Green Warbler * 8/20 9/2 9/22 10/13 10/28
Clay-colored Sparrow *** 8/20 9/3 9/24 10/16 10/30
Blue-headed Vireo *** 8/25 9/2 9/16 9/28 10/24
Brown Thrasher *** 8/26 9/4 9/14 9/29 10/9
Northern Parula *** 8/26 9/2 9/12 9/24 10/5
Nashville Warbler *** 8/27 9/5 9/22 10/14 10/24
Osprey *** 8/28 9/9 9/23 10/6 11/11
Common Yellowthroat *** 8/30 9/6 9/20 10/12 10/21
Sharp-shinned Hawk *** 8/31 10/2 10/17 10/28 After Nov 30
Eastern Phoebe *** 9/1 9/13 9/25 10/12 10/25
Summer Tanager *** 9/2 9/10 9/20 10/4 10/14
Pied-billed Grebe *** 9/3 9/16 10/30 11/13 11/29
Franklin's Gull *** 9/3 9/16 10/16 11/7 After Nov 30
Red-tailed Hawk *** 9/5 9/27 10/27 11/9 After Nov 30
Orange-crowned Warbler ****! 9/5 9/21 10/4 10/17 10/28
Western Grebe * 9/6 10/17 10/31 After Nov 30 -
Scissor-tailed Flycatcher *** 9/6 9/16 9/27 10/19 11/1
Lincoln's Sparrow *** 9/6 9/21 10/11 10/29 11/10
Northern Flicker ****! 9/7 9/16 10/1 11/4 11/13
Ruby-crowned Kinglet *** 9/7 9/21 10/8 10/24 11/8
Vesper Sparrow *** 9/7 9/23 10/10 10/27 11/6
Indigo Bunting ** 9/7 9/11 9/20 10/12 10/21
Broad-winged Hawk ** 9/8 9/15 9/23 10/5 10/12
Spotted Towhee *** 9/9 9/23 10/9 10/25 11/6

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Great Egret * - 8/2 9/13 10/20 11/11
Swainson's Hawk ** - 8/2 9/11 10/14 10/22
Sora * - 8/2 9/27 10/20 11/4
Greater Yellowlegs * - 8/2 10/27 11/16 After Nov 30
Tennessee Warbler ** 8/2 8/9 9/9 10/3 10/23
Blue-winged Teal *** 8/2 8/10 9/13 10/24 11/10
Rose-breasted Grosbeak * 8/2 8/12 9/2 9/29 10/12
Sanderling * 8/2 8/20 9/6 10/7 10/26
Least Flycatcher *** 8/2 8/20 9/4 9/20 10/2
Chestnut-sided Warbler * 8/11 8/21 9/3 9/18 10/1
Red-necked Phalarope * 8/2 8/22 9/7 9/29 10/15
Ovenbird ** 8/13 8/22 9/4 9/18 10/5
Olive-sided Flycatcher *** 8/13 8/23 9/3 9/16 9/24
Black-and-white Warbler *** 8/11 8/23 9/5 9/21 10/2
American Redstart *** 8/10 8/24 9/5 9/19 9/28
Yellow-breasted Chat * 8/19 8/26 9/5 9/20 9/30
Magnolia Warbler * 8/16 8/27 9/9 9/23 10/3
Say's Phoebe * 8/16 8/28 9/7 9/26 10/8
Warbling Vireo *** 8/20 8/28 9/6 9/19 9/27
Caspian Tern * 8/2 8/31 9/11 9/26 10/9
Yellow-throated Vireo * 8/24 8/31 9/8 9/19 9/27
Philadelphia Vireo * 8/18 8/31 9/13 9/27 10/6
White-eyed Vireo * 8/24 9/1 9/12 9/27 10/8
House Wren ** 8/25 9/1 9/11 10/6 10/20
Swainson's Thrush *** 8/24 9/1 9/11 9/22 10/1
Blue-headed Vireo *** 8/25 9/2 9/16 9/28 10/24
Northern Parula ** 8/26 9/2 9/12 9/24 10/5
Black-throated Green Warbler * 8/20 9/2 9/22 10/13 10/28
Clay-colored Sparrow *** 8/20 9/3 9/24 10/16 10/30
Turkey Vulture *** 8/2 9/4 9/27 10/16 10/25
Gray Catbird *** 8/2 9/4 9/13 10/1 10/13
Brown Thrasher *** 8/26 9/4 9/14 9/29 10/9
Cooper's Hawk ** 8/2 9/5 9/24 10/24 11/8
Nashville Warbler *** 8/27 9/5 9/22 10/14 10/24
Merlin * 8/19 9/6 10/24 11/8 11/24
Common Yellowthroat *** 8/30 9/6 9/20 10/12 10/21
Red-shouldered Hawk * 8/2 9/7 9/29 10/28 11/25
American White Pelican ** 8/2 9/8 10/18 After Nov 30 -
Osprey *** 8/28 9/9 9/23 10/6 11/11
Western Meadowlark *** 8/2 9/9 10/15 10/29 11/7

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Cattle Egret * - - Before Aug 1 10/1 11/2
Killdeer *** - - Before Aug 1 11/4 After Nov 30
Spotted Sandpiper *** - - Before Aug 1 9/9 9/29
Baird's Sandpiper ** - - Before Aug 1 9/10 9/21
Pectoral Sandpiper ** - - Before Aug 1 9/2 10/23
Black Tern ** - - Before Aug 1 9/12 9/30
Northern Rough-winged Swallow ** - - Before Aug 1 10/7 10/23
Tree Swallow ** - - Before Aug 1 9/9 11/1
Lark Sparrow *** - - Before Aug 1 9/13 9/26
Bobolink * - - Before Aug 1 9/4 10/2
Yellow-headed Blackbird * - 8/2 8/9 9/27 10/8
Lark Bunting ** - 8/2 8/11 9/17 9/24
Eastern Kingbird *** - 8/2 8/13 9/4 9/21
Solitary Sandpiper ** 8/2 8/7 8/15 9/10 9/26
Marbled Godwit * - 8/2 8/15 9/10 10/2
Chimney Swift *** - 8/2 8/15 10/11 10/20
Green Heron *** - 8/2 8/17 9/22 10/9
Mourning Dove *** - 8/2 8/17 10/4 10/25
Bank Swallow *** - 8/2 8/19 9/10 9/26
Wood Duck ** - 8/2 8/20 10/28 After Nov 30
Snowy Egret ** - 8/2 8/20 10/5 10/26
Mississippi Kite *** 8/9 8/14 8/20 9/7 9/20
Lesser Yellowlegs ** - 8/2 8/20 9/13 11/8
Semipalmated Sandpiper *** 8/2 8/13 8/20 9/9 9/23
Forster's Tern ** - 8/2 8/20 9/10 10/19
Eastern Wood-Pewee *** - 8/2 8/20 9/21 10/5
Little Blue Heron ** 8/2 8/11 8/21 9/8 10/7
Snowy Plover * 8/2 8/9 8/23 9/8 9/19
Wilson's Phalarope ** 8/12 8/17 8/23 9/12 9/25
Black-necked Stilt * 8/2 8/15 8/24 9/7 9/18
Least Sandpiper *** 8/2 8/6 8/25 9/14 9/24
Western Wood-Pewee * 8/12 8/18 8/25 9/11 9/23
Bell's Vireo *** 8/14 8/19 8/26 9/9 9/19
Baltimore Oriole *** 8/7 8/17 8/26 9/8 9/18
Black-crowned Night-Heron * - 8/2 8/27 9/27 10/28
Stilt Sandpiper *** 8/13 8/19 8/27 9/8 9/16
Semipalmated Plover ** 8/22 8/25 8/29 9/15 9/23
Buff-breasted Sandpiper ** 8/16 8/21 8/29 9/10 9/18
Common Nighthawk *** 8/15 8/21 8/29 10/1 10/10
Red-headed Woodpecker *** - 8/2 8/29 9/23 10/13
Northern Waterthrush ** 8/12 8/19 8/29 9/8 9/17
Yellow Warbler *** - 8/2 8/29 9/18 9/27
Great Crested Flycatcher *** 8/2 8/25 8/30 9/16 9/25
Blue-gray Gnatcatcher *** - 8/2 8/30 9/20 10/1
Ruby-throated Hummingbird *** - 8/2 8/31 9/22 10/5
Canada Warbler * 8/2 8/16 8/31 9/14 9/25
White-faced Ibis * - 8/2 9/1 10/2 10/30
Red-eyed Vireo *** 8/2 8/20 9/1 9/20 10/2
Mourning Warbler * 8/12 8/20 9/1 9/13 9/27
Rose-breasted Grosbeak ** 8/2 8/12 9/2 9/29 10/12
Olive-sided Flycatcher *** 8/13 8/23 9/3 9/16 9/24
Chestnut-sided Warbler * 8/11 8/21 9/3 9/18 10/1
Least Flycatcher *** 8/2 8/20 9/4 9/20 10/2
Ovenbird ** 8/13 8/22 9/4 9/18 10/5
Black-and-white Warbler *** 8/11 8/23 9/5 9/21 10/2
American Redstart *** 8/10 8/24 9/5 9/19 9/28
Yellow-breasted Chat * 8/19 8/26 9/5 9/20 9/30
Sanderling * 8/2 8/20 9/6 10/7 10/26
Warbling Vireo *** 8/20 8/28 9/6 9/19 9/27
Red-necked Phalarope * 8/2 8/22 9/7 9/29 10/15
Say's Phoebe ** 8/16 8/28 9/7 9/26 10/8
Yellow-throated Vireo ** 8/24 8/31 9/8 9/19 9/27
Tennessee Warbler * 8/2 8/9 9/9 10/3 10/23
Magnolia Warbler * 8/16 8/27 9/9 9/23 10/3

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Western Kingbird *** - - Before Aug 1 8/3 9/15
Orchard Oriole *** - - Before Aug 1 8/15 9/18
Yellow-crowned Night-Heron * - - Before Aug 1 8/17 10/10
Yellow-billed Cuckoo *** - - Before Aug 1 8/17 10/2
Least Tern * - - Before Aug 1 8/22 9/15
Purple Martin *** - - Before Aug 1 8/23 9/6
Blue Grosbeak *** - 8/2 8/9 8/23 9/3
Upland Sandpiper *** - - Before Aug 1 8/25 9/17
Willet * - - Before Aug 1 8/26 9/29
Cliff Swallow *** - - Before Aug 1 8/31 9/22
Black-bellied Plover * - 8/2 8/21 9/1 11/21
Pectoral Sandpiper ** - - Before Aug 1 9/2 10/23
Eastern Kingbird *** - 8/2 8/13 9/4 9/21
Bobolink * - - Before Aug 1 9/4 10/2
Mississippi Kite *** 8/9 8/14 8/20 9/7 9/20
Black-necked Stilt ** 8/2 8/15 8/24 9/7 9/18
Little Blue Heron ** 8/2 8/11 8/21 9/8 10/7
Snowy Plover * 8/2 8/9 8/23 9/8 9/19
Stilt Sandpiper *** 8/13 8/19 8/27 9/8 9/16
Northern Waterthrush ** 8/12 8/19 8/29 9/8 9/17
Baltimore Oriole *** 8/7 8/17 8/26 9/8 9/18
Spotted Sandpiper *** - - Before Aug 1 9/9 9/29
Semipalmated Sandpiper *** 8/2 8/13 8/20 9/9 9/23
Bell's Vireo *** 8/14 8/19 8/26 9/9 9/19
Tree Swallow ** - - Before Aug 1 9/9 11/1

West

Moderate flights are widespread to begin the period, with the exception being the Desert Southwest and southern Rockies. These flights continue, albeit significantly reduced in extent over the following days as more marginal conditions build into the region. Note that a weakening Tropical Storm Lidia passes south of the region, perhaps bring a stray pelagic waif to southern California on Saturday or Sunday. The work week begins with widespread favorable conditions for moderate flights in the northern half of the region, in particular the northern Rockies where more intense flights may occur. These conditions continue, deteriorating slightly by Tuesday and Wednesday nights, with concurrent decreases in flight intensities. This pattern continues through the end of the period, with most flights during the latter half of the work week being light and scattered away from the immediate coast (e.g. moderate flights are possible in portions of the Pacific Northwest).

Killdeer. Brad Rangell/Macaulay Library. eBird S38741997.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Canada Goose ** 8/2 11/4 After Nov 30 - -
Pied-billed Grebe ** 8/2 10/19 11/11 After Nov 30 -
Sooty Shearwater * 8/2 9/5 9/15 9/29 10/8
Cooper's Hawk ** 8/2 9/7 10/1 10/24 11/11
California Gull * 8/2 10/22 11/7 After Nov 30 -
Savannah Sparrow *** 8/2 9/3 9/23 10/24 11/2
Red-tailed Hawk *** 8/7 9/10 After Nov 30 - -
Ring-billed Gull ** 8/10 11/7 11/22 After Nov 30 -
Turkey Vulture *** 8/14 9/9 9/17 10/5 10/17
Heermann's Gull * 8/15 9/14 9/21 10/2 After Nov 30
Black Phoebe *** 8/16 9/9 11/17 After Nov 30 -
Northern Harrier ** 8/17 11/8 11/20 After Nov 30 -
Red-shouldered Hawk ** 8/17 9/12 10/3 After Nov 30 -
Marsh Wren * 8/21 9/20 10/29 After Nov 30 -
Sharp-shinned Hawk ** 8/23 9/10 10/19 11/11 After Nov 30
Brewer's Blackbird *** 8/23 9/11 9/27 10/20 After Nov 30
Common Tern * 8/24 9/6 9/17 10/1 10/11
Vesper Sparrow ** 8/24 9/2 9/13 9/27 10/15
Red-winged Blackbird *** 8/25 9/12 10/10 10/27 After Nov 30
Red-necked Grebe * 8/26 10/20 11/3 11/13 11/20
Parasitic Jaeger * 8/26 9/6 9/19 10/1 10/29
Vaux's Swift ** 8/28 9/5 9/14 10/3 10/20
Green-tailed Towhee *** 8/28 9/4 9/13 9/24 10/3
Merlin ** 8/30 9/14 11/9 11/28 After Nov 30
American Robin *** 8/30 9/4 10/10 10/17 11/14
Lincoln's Sparrow *** 8/30 9/11 10/4 10/21 11/5
American Pipit *** 8/31 9/11 11/15 After Nov 30 -
Say's Phoebe *** 9/1 9/13 11/21 After Nov 30 -
American Wigeon *** 9/2 10/17 11/22 After Nov 30 -
Eared Grebe *** 9/2 9/16 11/11 After Nov 30 -
Sabine's Gull * 9/2 9/11 9/21 10/3 10/13
Mountain Bluebird * 9/3 9/8 9/19 10/17 10/27
Summer Tanager * 9/4 9/9 9/16 10/3 10/13
Northern Flicker *** 9/5 9/29 10/16 11/8 11/22
Red-naped Sapsucker * 9/6 9/19 10/7 10/22 11/3
White-crowned Sparrow ****! 9/6 9/21 10/11 10/21 10/31
Fox Sparrow *** 9/9 9/23 10/20 11/1 11/8

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Blue-winged Teal * - 8/2 9/22 10/23 11/3
Common Merganser * - 8/2 9/23 9/28 9/30
Belted Kingfisher ** - 8/2 10/22 After Nov 30 -
Red-breasted Nuthatch ** - 8/2 9/7 10/19 10/30
Blue-gray Gnatcatcher * - 8/2 9/10 9/22 10/3
Nashville Warbler ** - 8/2 9/5 9/19 9/29
MacGillivray's Warbler *** - 8/2 9/5 9/21 10/2
Yellow Warbler *** - 8/2 9/8 10/2 10/21
Black-throated Gray Warbler * - 8/2 10/4 10/19 10/29
Chipping Sparrow ** - 8/2 9/8 10/18 11/2
Cinnamon Teal * 8/2 8/13 9/2 9/27 10/13
American White Pelican * 8/2 8/13 9/2 9/27 10/19
Killdeer *** 8/2 8/14 9/7 10/3 11/3
Black Turnstone * 8/6 8/17 9/21 10/2 After Nov 30
Sanderling * 8/2 8/17 9/8 9/26 10/6
Northern Shoveler *** 8/6 8/20 11/20 After Nov 30 -
Northern Pintail ** 8/12 8/20 11/19 After Nov 30 -
Green-winged Teal ** 8/2 8/20 11/17 After Nov 30 -
Elegant Tern * 8/2 8/21 9/7 After Nov 30 -
Yellow-headed Blackbird * 8/6 8/22 9/2 9/23 10/11
Pectoral Sandpiper ** 8/16 8/25 9/20 10/9 10/24
Pacific-slope Flycatcher ** 8/14 8/25 9/12 10/3 10/17
Gray Catbird * 8/2 8/25 9/2 9/17 9/26
Willow Flycatcher ** 8/14 8/26 9/5 9/19 9/29
Pink-footed Shearwater * 8/8 8/27 9/14 10/25 11/7
Wilson's Warbler *** 8/2 8/27 9/8 9/24 10/9
Clay-colored Sparrow * 8/17 8/28 9/14 10/18 11/6
Cassin's Vireo * 8/2 8/29 9/8 9/20 9/29
Warbling Vireo *** 8/21 8/29 9/9 9/22 10/9
Swainson's Thrush ** 8/22 8/29 9/10 9/25 10/7
Brewer's Sparrow * 8/2 8/29 9/9 9/24 10/5
Common Yellowthroat *** 8/18 8/30 9/15 10/5 10/27
Townsend's Warbler *** 8/13 8/30 10/2 10/22 11/6
Western Tanager *** 8/23 8/30 9/8 9/21 10/3
Hammond's Flycatcher * 8/24 8/31 9/8 9/19 9/26
Plumbeous Vireo * 8/27 8/31 9/6 9/19 9/27
House Wren ** 8/23 8/31 9/9 9/21 10/26
Sora * 8/21 9/1 9/13 9/23 After Nov 30
Orange-crowned Warbler *** 8/18 9/1 9/18 10/15 10/27
Vesper Sparrow ** 8/24 9/2 9/13 9/27 10/15
Savannah Sparrow *** 8/2 9/3 9/23 10/24 11/2
American Robin ** 8/30 9/4 10/10 10/17 11/14
Green-tailed Towhee ** 8/28 9/4 9/13 9/24 10/3
Sooty Shearwater * 8/2 9/5 9/15 9/29 10/8
Vaux's Swift * 8/28 9/5 9/14 10/3 10/20
Parasitic Jaeger * 8/26 9/6 9/19 10/1 10/29
Common Tern * 8/24 9/6 9/17 10/1 10/11
Cooper's Hawk ** 8/2 9/7 10/1 10/24 11/11
Mountain Bluebird * 9/3 9/8 9/19 10/17 10/27
Turkey Vulture ** 8/14 9/9 9/17 10/5 10/17
Black Phoebe ** 8/16 9/9 11/17 After Nov 30 -
Summer Tanager * 9/4 9/9 9/16 10/3 10/13

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Snowy Plover * - - Before Aug 1 9/11 10/1
Whimbrel * - - Before Aug 1 9/29 10/13
Wilson's Phalarope ** - - Before Aug 1 9/8 9/27
Caspian Tern ** - - Before Aug 1 9/7 9/27
Black Tern * - - Before Aug 1 9/22 10/4
White-winged Dove *** - - Before Aug 1 9/3 9/15
Common Nighthawk * - - Before Aug 1 9/2 9/24
Black-chinned Hummingbird *** - - Before Aug 1 9/14 10/3
Rufous Hummingbird *** - - Before Aug 1 9/7 9/24
Calliope Hummingbird * - - Before Aug 1 9/5 9/24
Western Kingbird *** - - Before Aug 1 9/4 9/24
Bell's Vireo * - - Before Aug 1 9/28 10/11
Northern Rough-winged Swallow ** - - Before Aug 1 9/10 9/25
Purple Martin * - - Before Aug 1 9/4 9/20
Black-headed Grosbeak *** - - Before Aug 1 9/14 9/28
Blue Grosbeak ** - - Before Aug 1 9/16 10/9
Bullock's Oriole ** - - Before Aug 1 9/2 9/14
Western Wood-Pewee *** - 8/2 8/10 9/20 9/30
Lazuli Bunting ** - 8/2 8/14 9/21 10/2
Lark Sparrow ** - 8/2 8/15 9/20 9/30
Bank Swallow * - 8/2 8/17 9/11 9/25
Lark Bunting * - 8/2 8/17 9/17 9/26
Swainson's Hawk ** - 8/2 8/18 9/28 10/12
Spotted Sandpiper *** - 8/2 8/18 9/17 10/3
Mourning Dove *** 8/9 8/14 8/19 9/21 10/8
Hermit Warbler * - 8/2 8/19 9/3 10/23
Semipalmated Sandpiper * 8/2 8/9 8/20 9/5 9/15
Barn Swallow *** 8/2 8/9 8/23 9/17 10/12
Osprey ** - 8/2 8/25 9/16 10/2
Lesser Yellowlegs ** 8/2 8/15 8/25 9/6 10/7
Least Sandpiper *** 8/2 8/14 8/25 9/6 9/16
Western Sandpiper *** 8/2 8/14 8/25 9/6 10/5
Semipalmated Plover *** 8/9 8/17 8/26 9/8 9/20
Solitary Sandpiper ** 8/2 8/13 8/26 9/9 9/22
Wandering Tattler * 8/10 8/17 8/26 10/2 10/10
Short-billed Dowitcher ** 8/10 8/18 8/26 9/6 9/13
White-faced Ibis ** 8/2 8/12 8/27 9/26 10/13
Black-necked Stilt ** 8/16 8/20 8/27 9/26 10/6
Baird's Sandpiper ** 8/3 8/17 8/27 9/8 9/20
Green Heron * 8/2 8/10 8/28 9/23 10/17
Greater Yellowlegs * 8/11 8/18 8/28 After Nov 30 -
Marbled Godwit * 8/9 8/17 8/28 9/29 After Nov 30
Virginia's Warbler * 8/2 8/14 8/28 9/16 10/1
Olive-sided Flycatcher ** 8/23 8/26 8/29 9/17 9/28
American Avocet * 8/15 8/21 8/30 9/30 After Nov 30
Franklin's Gull * - 8/2 8/31 10/3 11/5
Sage Thrasher * - 8/2 8/31 9/20 10/13
Red-necked Phalarope *** 8/8 8/20 9/1 9/16 10/9
Cinnamon Teal * 8/2 8/13 9/2 9/27 10/13
American White Pelican * 8/2 8/13 9/2 9/27 10/19
Gray Catbird ** 8/2 8/25 9/2 9/17 9/26
Yellow-headed Blackbird * 8/6 8/22 9/2 9/23 10/11
Willow Flycatcher *** 8/14 8/26 9/5 9/19 9/29
Nashville Warbler ** - 8/2 9/5 9/19 9/29
MacGillivray's Warbler *** - 8/2 9/5 9/21 10/2
Plumbeous Vireo * 8/27 8/31 9/6 9/19 9/27
Killdeer ** 8/2 8/14 9/7 10/3 11/3
Elegant Tern * 8/2 8/21 9/7 After Nov 30 -
Red-breasted Nuthatch * - 8/2 9/7 10/19 10/30
Sanderling * 8/2 8/17 9/8 9/26 10/6
Hammond's Flycatcher * 8/24 8/31 9/8 9/19 9/26
Cassin's Vireo ** 8/2 8/29 9/8 9/20 9/29
Yellow Warbler *** - 8/2 9/8 10/2 10/21
Wilson's Warbler *** 8/2 8/27 9/8 9/24 10/9
Chipping Sparrow *** - 8/2 9/8 10/18 11/2
Western Tanager *** 8/23 8/30 9/8 9/21 10/3
Warbling Vireo *** 8/21 8/29 9/9 9/22 10/9
House Wren *** 8/23 8/31 9/9 9/21 10/26
Brewer's Sparrow ** 8/2 8/29 9/9 9/24 10/5

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Tree Swallow *** - - Before Aug 1 8/3 9/17
Violet-green Swallow *** - - Before Aug 1 8/3 10/23
Yellow-breasted Chat * - - Before Aug 1 8/3 9/25
Hooded Oriole ** - - Before Aug 1 8/3 9/22
Broad-billed Hummingbird * - - Before Aug 1 8/7 9/16
Cliff Swallow *** - - Before Aug 1 8/11 9/14
Pigeon Guillemot ** - - Before Aug 1 8/27 9/8
Eastern Kingbird *** - 8/2 8/14 8/30 9/10
Broad-tailed Hummingbird *** - - Before Aug 1 9/1 9/26
Common Nighthawk ** - - Before Aug 1 9/2 9/24
Bullock's Oriole ** - - Before Aug 1 9/2 9/14
White-winged Dove *** - - Before Aug 1 9/3 9/15
Hermit Warbler * - 8/2 8/19 9/3 10/23
Western Kingbird *** - - Before Aug 1 9/4 9/24
Purple Martin * - - Before Aug 1 9/4 9/20
Semipalmated Sandpiper ** 8/2 8/9 8/20 9/5 9/15
Calliope Hummingbird * - - Before Aug 1 9/5 9/24
Lesser Yellowlegs ** 8/2 8/15 8/25 9/6 10/7
Least Sandpiper *** 8/2 8/14 8/25 9/6 9/16
Western Sandpiper *** 8/2 8/14 8/25 9/6 10/5
Short-billed Dowitcher ** 8/10 8/18 8/26 9/6 9/13
Caspian Tern *** - - Before Aug 1 9/7 9/27
Rufous Hummingbird *** - - Before Aug 1 9/7 9/24
Semipalmated Plover *** 8/9 8/17 8/26 9/8 9/20
Baird's Sandpiper *** 8/3 8/17 8/27 9/8 9/20
Wilson's Phalarope ** - - Before Aug 1 9/8 9/27
Solitary Sandpiper ** 8/2 8/13 8/26 9/9 9/22

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Farnsworth and Van Doren

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