Regional Migration Forecast: 13-20 October 2017

Wilson’s Snipe. Louise Auclair/Macaulay Library. eBird S39830094.

Continental Summary

Early and late period migration conditions will be favorable for light to moderate flights in the West that feature Sharp-shinned Hawk, Belted Kingfisher, Northern Flicker, Ruby-crowned Kinglet, Yellow-rumped Warbler, Western Meadowlark, Golden-crowned Sparrow, and Fox Sparrow, while the passage of a significant frontal boundary brings moderate to very heavy flights of Cooper’s Hawk, Franklin’s Gull, Belted Kingfisher, Northern Flicker, Brown Creeper, Ruby-crowned Kinglet, Savannah Sparrow, Le Conte’s Sparrow, Song Sparrow, and White-throated Sparrow to the East.

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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Quick Links to Regions

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BirdCast West Region

Upper Midwest and Northeast

Locally moderate movements will occur in the patchwork of favorable migration conditions occurring in the region during the weekend. A large low pressure center will bring a significant change by Sunday as it moves first through the Great Lakes; moderate to very heavy flights will follow. By Monday night many areas east of the Ohio River Valley will experience moderate to very heavy flights. After this frontal passage, more marginal and unfavorable conditions build into the region that decrease both intensity and extent of movements. Some coastal areas will continue to experience locally moderate, and perhaps at times heavy, flights through the remainder of the period. However, much of the region will see light to locally moderate flights, particularly to the west of the Appalachians where southerly flow will prevail.

Winter Wren. Jay McGowan/Macaulay Library. eBird S39623205.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Great Cormorant * 9/5 11/16 After Nov 30 - -
Dunlin ** 9/13 10/17 10/29 11/11 11/22
American Black Duck *** 9/23 10/14 After Nov 30 - -
Surf Scoter ** 9/25 10/19 11/4 11/12 11/17
Redhead * 9/28 10/19 11/14 11/18 11/20
Dark-eyed Junco ****! 9/28 10/14 11/10 11/16 11/22
Fox Sparrow *** 9/28 10/16 11/9 After Nov 30 -
Ruddy Duck *** 9/29 10/17 11/8 11/23 After Nov 30
Gadwall *** 10/4 10/19 11/12 11/22 After Nov 30
Ring-necked Duck *** 10/7 10/23 11/9 11/17 11/24
Greater Scaup * 10/9 10/22 After Nov 30 - -
Red-necked Grebe * 10/11 10/23 11/5 11/15 11/23
Red-throated Loon ** 10/11 10/28 After Nov 30 - -
Canvasback * 10/12 10/23 After Nov 30 - -
Lesser Scaup *** 10/12 10/25 11/14 11/20 After Nov 30
Bonaparte's Gull *** 10/12 10/25 11/11 After Nov 30 -
White-winged Scoter ** 10/12 10/24 11/6 11/13 11/18
Common Loon *** 10/14 10/26 11/11 11/24 After Nov 30
Horned Grebe *** 10/15 10/26 11/11 11/17 11/22
Common Merganser ** 10/16 11/29 After Nov 30 - -
Red-breasted Merganser *** 10/16 11/1 After Nov 30 - -
Long-tailed Duck *** 10/18 10/27 After Nov 30 - -
Bufflehead ****! 10/20 10/30 11/22 After Nov 30 -
Hooded Merganser *** 10/20 11/3 After Nov 30 - -

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Sharp-shinned Hawk *** 8/31 9/10 10/17 10/30 After Nov 30
American Pipit ** 9/10 9/22 10/24 11/11 11/25
Eastern Bluebird *** 9/12 9/27 10/18 11/12 After Nov 30
Winter Wren *** 9/17 9/28 10/15 10/28 11/8
Brown Creeper *** 9/19 9/29 10/14 10/24 11/5
Ruby-crowned Kinglet ****! 9/18 9/30 10/14 10/28 11/8
White-throated Sparrow ****! 9/18 9/30 10/18 10/31 11/12
Golden-crowned Kinglet ****! 9/22 10/1 10/15 11/6 11/18
Song Sparrow *** 9/19 10/1 10/14 10/28 11/10
Eastern Meadowlark ** 9/17 10/2 10/16 10/30 11/11
White-crowned Sparrow *** 9/23 10/2 10/15 10/27 11/6
Wilson's Snipe * 9/24 10/3 10/16 10/29 After Nov 30
Rusty Blackbird ** 9/19 10/3 10/23 11/10 After Nov 30
Red-winged Blackbird *** 9/24 10/4 10/18 11/6 After Nov 30
Hermit Thrush *** 9/25 10/6 10/19 10/31 11/10
American Wigeon ** 9/23 10/8 10/28 11/10 11/29
Field Sparrow *** 9/29 10/8 10/18 10/30 11/8
Common Grackle ** 10/2 10/8 10/18 11/7 After Nov 30
Purple Finch *** 9/26 10/8 10/24 11/8 After Nov 30
Northern Harrier ** 8/2 10/9 10/21 11/2 11/13
Pine Siskin *** 9/27 10/10 10/28 11/11 After Nov 30
Green-winged Teal ** 8/13 10/11 10/24 After Nov 30 -
Pied-billed Grebe *** 9/4 10/11 10/31 11/20 After Nov 30
Northern Shoveler * 8/9 10/12 11/8 After Nov 30 -
Northern Pintail ** 9/5 10/12 10/27 11/7 After Nov 30
Vesper Sparrow * 10/5 10/12 10/21 11/2 11/10
Brant ** 10/1 10/13 10/30 11/8 11/15
American Black Duck ** 9/23 10/14 After Nov 30 - -
Dark-eyed Junco ****! 9/28 10/14 11/10 11/16 11/22
Fox Sparrow *** 9/28 10/16 11/9 After Nov 30 -
Ruddy Duck *** 9/29 10/17 11/8 11/23 After Nov 30
Dunlin ** 9/13 10/17 10/29 11/11 11/22
Gadwall ** 10/4 10/19 11/12 11/22 After Nov 30
Redhead * 9/28 10/19 11/14 11/18 11/20
Surf Scoter * 9/25 10/19 11/4 11/12 11/17

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
Tree Swallow *** - 8/2 8/9 10/25 11/6
Snowy Egret ** - 8/2 8/11 10/17 10/31
Great Egret *** - 8/2 8/13 10/22 11/5
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
Greater Yellowlegs ** - 8/2 8/20 11/11 After Nov 30
Wood Duck ** - 8/2 8/21 11/2 11/22
Royal Tern * - 8/2 8/21 11/8 After Nov 30
Blue-winged Teal ** 8/2 8/19 9/7 10/22 11/5
Turkey Vulture *** 8/28 9/6 9/19 10/27 After Nov 30
Belted Kingfisher *** - 8/2 9/19 10/16 10/29
Merlin * 8/26 9/4 9/20 10/26 11/6
Red-shouldered Hawk * 8/26 9/5 9/21 11/10 11/19
Black-throated Blue Warbler *** 8/23 9/2 9/25 10/14 10/23
American Kestrel ** 8/29 9/6 9/26 10/22 11/2
Blue Jay *** 8/23 9/8 9/28 10/30 11/26
Eastern Phoebe *** 9/9 9/18 9/30 10/18 11/3
Marsh Wren * 9/7 9/19 9/30 10/17 10/29
Red-breasted Nuthatch ** 8/12 9/4 10/2 10/17 After Nov 30
Peregrine Falcon ** 8/2 9/23 10/4 10/17 10/28
Blue-headed Vireo *** 9/8 9/21 10/4 10/19 10/31
Yellow-bellied Sapsucker *** 9/16 9/25 10/5 10/16 10/24
Lincoln's Sparrow *** 9/10 9/22 10/5 10/19 10/31
Palm Warbler *** 9/2 9/21 10/6 10/21 11/1
Eastern Towhee *** 9/23 9/30 10/9 10/23 11/3
Horned Lark * 9/23 9/29 10/10 10/15 10/17
Cooper's Hawk *** 8/2 9/7 10/11 10/28 11/8
Yellow-rumped Warbler *** 9/19 9/29 10/12 10/26 11/7
Chipping Sparrow *** 9/16 10/2 10/12 10/29 11/9
Savannah Sparrow *** 9/12 9/26 10/12 10/29 11/12
American Robin *** 9/13 9/24 10/13 11/8 After Nov 30
Swamp Sparrow *** 9/20 9/30 10/13 10/27 11/10
Brown Creeper ** 9/19 9/29 10/14 10/24 11/5
Ruby-crowned Kinglet *** 9/18 9/30 10/14 10/28 11/8
Song Sparrow *** 9/19 10/1 10/14 10/28 11/10
Winter Wren ** 9/17 9/28 10/15 10/28 11/8
Golden-crowned Kinglet *** 9/22 10/1 10/15 11/6 11/18
White-crowned Sparrow *** 9/23 10/2 10/15 10/27 11/6
Wilson's Snipe * 9/24 10/3 10/16 10/29 After Nov 30
Eastern Meadowlark * 9/17 10/2 10/16 10/30 11/11
Sharp-shinned Hawk *** 8/31 9/10 10/17 10/30 After Nov 30
Eastern Bluebird ** 9/12 9/27 10/18 11/12 After Nov 30
Field Sparrow *** 9/29 10/8 10/18 10/30 11/8
White-throated Sparrow *** 9/18 9/30 10/18 10/31 11/12
Red-winged Blackbird *** 9/24 10/4 10/18 11/6 After Nov 30
Common Grackle *** 10/2 10/8 10/18 11/7 After Nov 30
Hermit Thrush *** 9/25 10/6 10/19 10/31 11/10
Northern Harrier ** 8/2 10/9 10/21 11/2 11/13
Vesper Sparrow ** 10/5 10/12 10/21 11/2 11/10

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
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
Black-bellied Plover * - 8/2 8/18 8/27 After Nov 30
Blue Grosbeak * - - Before Aug 1 8/31 10/17
Pectoral Sandpiper ** 8/11 8/17 8/23 9/7 11/13
Caspian Tern ** - 8/2 8/20 9/12 10/22
Bobolink ** 8/2 8/19 9/2 9/16 10/19
American Golden-Plover * 8/16 8/26 9/9 9/22 10/16
Cedar Waxwing *** - 8/2 8/17 9/25 After Nov 30
Forster's Tern * - 8/2 8/16 9/26 After Nov 30
Swainson's Thrush *** 8/27 9/5 9/17 9/30 10/14
Cape May Warbler *** 8/25 9/4 9/18 10/2 10/15
Brown Thrasher *** 8/30 9/9 9/21 10/4 10/17
Tennessee Warbler *** 8/17 8/29 9/15 10/4 10/19
Northern Parula *** 8/28 9/7 9/20 10/4 10/15
Gray-cheeked Thrush ** 9/2 9/11 9/23 10/5 10/14
Black-throated Green Warbler *** 8/24 9/7 9/21 10/6 10/17
House Wren *** 8/30 9/5 9/15 10/7 10/21
Blackpoll Warbler *** 8/28 9/7 9/22 10/8 10/23
Gray Catbird *** 8/28 9/8 9/18 10/9 10/22
Common Yellowthroat *** 8/24 9/2 9/17 10/9 10/23
Yellow-crowned Night-Heron * - 8/2 8/6 10/10 10/28
Northern Flicker *** 8/30 9/12 9/25 10/10 10/30
Nashville Warbler *** 8/23 9/3 9/20 10/10 10/22
Chimney Swift *** 8/9 8/14 8/18 10/11 10/20
Sora * 8/12 8/21 9/24 10/12 10/25
Pine Warbler *** 8/23 9/4 9/21 10/12 10/26
Indigo Bunting *** 9/10 9/16 9/25 10/12 10/21
Black-throated Blue Warbler *** 8/23 9/2 9/25 10/14 10/23
Horned Lark * 9/23 9/29 10/10 10/15 10/17
Belted Kingfisher *** - 8/2 9/19 10/16 10/29
Yellow-bellied Sapsucker *** 9/16 9/25 10/5 10/16 10/24
Snowy Egret ** - 8/2 8/11 10/17 10/31
Peregrine Falcon *** 8/2 9/23 10/4 10/17 10/28
Red-breasted Nuthatch * 8/12 9/4 10/2 10/17 After Nov 30
Marsh Wren ** 9/7 9/19 9/30 10/17 10/29
Eastern Phoebe *** 9/9 9/18 9/30 10/18 11/3
Osprey *** - 8/2 8/15 10/19 11/4
Blue-headed Vireo *** 9/8 9/21 10/4 10/19 10/31
Lincoln's Sparrow *** 9/10 9/22 10/5 10/19 10/31
Great Blue Heron *** - 8/2 8/15 10/20 After Nov 30
Palm Warbler *** 9/2 9/21 10/6 10/21 11/1

Gulf Coast and Southeast

A weekend of locally moderate flights where migration conditions allow will give way to much more significant flights by Sunday and Monday. A cold front passing through the region will spawn heavy and very heavy flights in many areas, first to the west of the Mississippi River on Sunday and then to almost all of the remainder of the region by Monday night. Note that some areas, particularly Florida, may have potential for local concentrations and fallouts where heavy migration meets precipitation; birders should watch these conditions carefully. Moderate to locally very heavy flights continue into Wednesday night, gradually decreasing in extent from the west. By the end of the period, intense movements continue, mostly to the east of the Mississippi River.

Belted Kingfisher. Karen Lebing/Macaulay Library. eBird S39830011.

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 -
American Avocet * 8/2 10/22 11/7 After Nov 30 -
Blue-headed Vireo ** 9/3 10/15 10/31 11/8 11/14
Northern Harrier *** 9/16 10/27 11/16 After Nov 30 -
Herring Gull ** 9/22 11/29 After Nov 30 - -
Pied-billed Grebe *** 9/25 10/31 11/20 After Nov 30 -
Ruby-crowned Kinglet ****! 9/26 10/14 11/16 11/24 After Nov 30
American White Pelican *** 9/29 10/30 11/15 11/21 After Nov 30
Wilson's Snipe *** 9/30 10/15 11/14 After Nov 30 -
Red-tailed Hawk *** 10/1 10/26 11/20 After Nov 30 -
Western Meadowlark * 10/2 10/19 11/12 After Nov 30 -
Eastern Meadowlark *** 10/2 10/15 11/3 11/23 After Nov 30
Spotted Towhee * 10/5 10/16 After Nov 30 - -
Savannah Sparrow *** 10/5 10/20 11/10 11/27 After Nov 30
Brown Creeper ** 10/6 10/18 11/23 After Nov 30 -
Yellow-rumped Warbler ****! 10/6 10/18 After Nov 30 - -
Winter Wren *** 10/7 10/17 After Nov 30 - -
Golden-crowned Kinglet *** 10/7 10/17 11/15 After Nov 30 -
Song Sparrow *** 10/7 10/19 11/17 After Nov 30 -
Sandhill Crane ** 10/8 10/29 After Nov 30 - -
White-throated Sparrow ****! 10/9 10/19 11/18 After Nov 30 -
American Wigeon *** 10/10 10/30 11/18 After Nov 30 -
Dunlin *** 10/10 10/26 11/12 After Nov 30 -
Green-winged Teal *** 10/11 11/4 11/18 After Nov 30 -
Vesper Sparrow *** 10/12 10/23 11/7 11/15 11/22
Chipping Sparrow *** 10/13 10/24 After Nov 30 - -
Franklin's Gull ** 10/14 10/26 11/7 11/25 After Nov 30
Field Sparrow *** 10/14 10/25 11/14 After Nov 30 -
Pine Siskin ** 10/14 10/30 After Nov 30 - -
Hermit Thrush *** 10/15 10/25 11/11 11/17 11/21
Gadwall *** 10/17 10/30 11/19 After Nov 30 -
Orange-crowned Warbler *** 10/17 10/28 11/10 11/18 11/24
Northern Pintail *** 10/18 10/31 11/18 After Nov 30 -
Ruddy Duck *** 10/18 11/1 11/19 After Nov 30 -
Common Gallinule *** 10/18 10/28 11/11 11/19 After Nov 30
Common Gallinule *** 10/18 10/28 11/11 11/19 After Nov 30
Dark-eyed Junco *** 10/18 11/2 After Nov 30 - -
Northern Gannet * 10/19 11/4 After Nov 30 - -
Ring-necked Duck *** 10/20 11/5 11/23 After Nov 30 -
Redhead *** 10/21 11/3 11/19 After Nov 30 -
Eared Grebe * 10/21 11/4 11/24 After Nov 30 -
Black-necked Stilt ** 10/21 10/29 11/9 After Nov 30 -

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black-bellied Plover * - 8/2 10/31 After Nov 30 -
Caspian Tern * - 8/2 11/7 After Nov 30 -
Blue-winged Teal * 8/8 8/26 11/8 11/29 After Nov 30
Bald Eagle ** 9/3 9/15 11/21 After Nov 30 -
Belted Kingfisher *** 8/13 9/18 10/22 After Nov 30 -
Cooper's Hawk ** 8/2 9/21 10/17 After Nov 30 -
Sora * 8/29 9/21 11/7 11/17 After Nov 30
Sharp-shinned Hawk ** 9/8 9/24 10/28 11/15 After Nov 30
Brown-headed Cowbird ** 9/15 9/27 10/23 After Nov 30 -
American Kestrel *** 9/12 9/29 11/12 After Nov 30 -
Black Vulture ** 8/28 9/30 11/18 After Nov 30 -
Northern Flicker *** 9/18 10/1 10/17 10/29 11/8
Tree Swallow ** 9/24 10/3 11/2 11/14 11/22
Marsh Wren ** 9/20 10/3 11/1 11/18 After Nov 30
Lincoln's Sparrow ** 9/23 10/4 10/31 11/13 11/21
Painted Bunting * 9/28 10/4 10/14 10/29 11/9
Red-winged Blackbird *** 9/22 10/4 11/9 After Nov 30 -
Palm Warbler *** 9/15 10/5 10/20 10/31 11/7
House Wren *** 9/23 10/6 10/28 11/12 After Nov 30
American Bittern * 9/14 10/9 11/12 After Nov 30 -
Eastern Phoebe *** 9/25 10/9 10/30 After Nov 30 -
Common Grackle *** 9/29 10/9 10/21 After Nov 30 -
Yellow-bellied Sapsucker *** 9/30 10/9 10/24 10/31 11/6
Eastern Towhee ** 9/10 10/10 10/19 11/1 11/12
Double-crested Cormorant *** 9/27 10/11 11/22 After Nov 30 -
Red-breasted Nuthatch * 10/2 10/11 10/23 After Nov 30 -
Sedge Wren * 9/28 10/11 11/2 After Nov 30 -
Ruby-crowned Kinglet *** 9/26 10/14 11/16 11/24 After Nov 30
Wilson's Snipe ** 9/30 10/15 11/14 After Nov 30 -
Blue-headed Vireo ** 9/3 10/15 10/31 11/8 11/14
Eastern Meadowlark *** 10/2 10/15 11/3 11/23 After Nov 30
Spotted Towhee * 10/5 10/16 After Nov 30 - -
Winter Wren * 10/7 10/17 After Nov 30 - -
Golden-crowned Kinglet *** 10/7 10/17 11/15 After Nov 30 -
Brown Creeper * 10/6 10/18 11/23 After Nov 30 -
Yellow-rumped Warbler *** 10/6 10/18 After Nov 30 - -
Song Sparrow *** 10/7 10/19 11/17 After Nov 30 -
White-throated Sparrow *** 10/9 10/19 11/18 After Nov 30 -
Western Meadowlark * 10/2 10/19 11/12 After Nov 30 -
Savannah Sparrow *** 10/5 10/20 11/10 11/27 After Nov 30

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Piping Plover * - 8/2 8/20 After Nov 30 -
Eastern Wood-Pewee *** 8/19 9/1 9/17 10/17 11/2
Red-headed Woodpecker ** 8/22 9/4 9/18 10/26 11/5
Northern Parula *** 8/11 9/2 9/19 10/24 11/4
Black-and-white Warbler *** 8/22 9/5 9/22 10/25 11/5
Prairie Warbler *** 8/2 9/7 9/22 10/14 11/3
Ovenbird *** 8/26 9/11 9/25 10/25 11/5
Yellow-throated Warbler ** 8/2 9/3 9/25 10/20 11/4
Cape May Warbler * 9/3 9/12 9/25 10/28 11/5
American Redstart *** 8/31 9/12 9/26 10/19 11/2
Scarlet Tanager *** 8/30 9/12 9/28 10/14 10/25
Magnolia Warbler *** 8/31 9/13 10/1 10/19 10/31
Swainson's Hawk * - 8/2 10/2 10/16 10/28
Wood Thrush ** 9/10 9/21 10/2 10/15 10/25
Tennessee Warbler *** 8/31 9/11 10/3 10/23 11/3
Nashville Warbler ** 8/30 9/11 10/4 10/24 11/12
Clay-colored Sparrow * 9/2 9/16 10/4 10/21 11/6
Rose-breasted Grosbeak *** 9/12 9/21 10/4 10/16 10/26
Brown Thrasher *** 9/2 9/22 10/6 10/21 11/3
Common Yellowthroat *** 9/1 9/17 10/6 10/21 11/2
Peregrine Falcon ** 9/15 9/25 10/7 10/18 10/26
Scissor-tailed Flycatcher *** 9/8 9/23 10/7 11/3 11/23
Merlin * 9/8 9/18 10/9 11/2 11/16
Pine Warbler *** 8/15 9/1 10/9 10/26 11/3
Gray Catbird *** 9/16 9/27 10/10 10/23 11/6
Northern Mockingbird *** 9/7 9/23 10/10 10/26 11/22
Black-throated Green Warbler *** 8/28 9/6 10/10 10/25 11/6
Black-throated Blue Warbler *** 8/31 9/11 10/11 10/27 11/5
Indigo Bunting *** 9/21 9/30 10/11 10/25 11/5
Northern Rough-winged Swallow ** 9/25 10/3 10/13 11/2 11/20
Painted Bunting ** 9/28 10/4 10/14 10/29 11/9
Cooper's Hawk ** 8/2 9/21 10/17 After Nov 30 -
Northern Flicker *** 9/18 10/1 10/17 10/29 11/8
Eastern Towhee *** 9/10 10/10 10/19 11/1 11/12
Palm Warbler *** 9/15 10/5 10/20 10/31 11/7
Common Grackle *** 9/29 10/9 10/21 After Nov 30 -

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Blue Grosbeak ** - - Before Aug 1 8/24 10/28
Sandwich Tern * - 8/2 8/16 8/27 After Nov 30
Barn Swallow *** - 8/2 8/10 9/9 11/14
Cliff Swallow ** - - Before Aug 1 9/14 10/18
Least Sandpiper * - 8/2 8/25 9/15 After Nov 30
Western Sandpiper * 8/2 8/17 8/31 9/15 After Nov 30
Cave Swallow * 8/2 8/28 9/4 9/16 11/21
Dickcissel * 8/21 8/29 9/5 9/20 10/25
Blue-gray Gnatcatcher *** 8/2 8/29 9/12 9/26 10/15
Wilson's Warbler *** 8/27 9/4 9/17 9/29 10/16
Common Tern * - 8/2 8/18 9/30 11/10
Summer Tanager *** 8/21 9/1 9/15 10/1 10/18
Acadian Flycatcher *** 8/21 9/1 9/15 10/2 10/16
Cattle Egret ** - - Before Aug 1 10/3 10/18
Blackburnian Warbler ** 8/26 9/5 9/18 10/3 10/28
Ruby-throated Hummingbird *** 8/13 8/29 9/13 10/4 10/19
Hooded Warbler *** 8/8 8/20 9/20 10/5 10/29
Broad-winged Hawk ** 9/6 9/15 9/25 10/6 10/16
Yellow-crowned Night-Heron * - - Before Aug 1 10/8 10/23
Red-eyed Vireo *** 8/20 9/3 9/17 10/8 10/24
Chestnut-sided Warbler *** 8/23 9/6 9/22 10/9 10/23
Chimney Swift *** 8/23 9/5 9/21 10/11 10/22
White-eyed Vireo *** 8/21 9/2 9/19 10/13 10/28
Swainson's Thrush *** 9/8 9/17 9/29 10/13 10/23
Bobolink * 8/21 9/2 9/20 10/13 10/26
Prairie Warbler *** 8/2 9/7 9/22 10/14 11/3
Scarlet Tanager *** 8/30 9/12 9/28 10/14 10/25
Wood Thrush *** 9/10 9/21 10/2 10/15 10/25
Swainson's Hawk * - 8/2 10/2 10/16 10/28
Rose-breasted Grosbeak *** 9/12 9/21 10/4 10/16 10/26
Eastern Wood-Pewee *** 8/19 9/1 9/17 10/17 11/2
Peregrine Falcon *** 9/15 9/25 10/7 10/18 10/26
American Redstart *** 8/31 9/12 9/26 10/19 11/2
Magnolia Warbler *** 8/31 9/13 10/1 10/19 10/31
Yellow-throated Warbler *** 8/2 9/3 9/25 10/20 11/4
Brown Thrasher *** 9/2 9/22 10/6 10/21 11/3
Common Yellowthroat *** 9/1 9/17 10/6 10/21 11/2
Clay-colored Sparrow * 9/2 9/16 10/4 10/21 11/6

Great Plains

The passage of a strong low pressure system on Saturday brings moderate to very heavy flights across the region on Saturday and Sunday nights. Less favorable conditions, driven by the return of southerly winds, rapidly decrease the extent and intensity of these flights to locally light to moderate movements by Monday. As high pressure continues to build in the region, migration amounts will remain largely light for the duration of the period as southerly winds and warmer temperatures prevail across the region. Some locally more intense flights may occur if wind speeds are low or winds are calm, but these flights will not be widespread.

Franklin’s Gull. Matthew Sabatine/Macaulay Library. eBird S39514185.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Purple Finch * 8/2 10/27 After Nov 30 - -
Western Grebe * 9/6 10/17 10/31 After Nov 30 -
Dark-eyed Junco ****! 9/29 10/14 11/20 After Nov 30 -
Herring Gull *** 9/30 10/24 After Nov 30 - -
American Wigeon *** 10/4 10/20 11/4 11/20 After Nov 30
Greater White-fronted Goose *** 10/5 10/18 11/5 11/24 After Nov 30
Green-winged Teal *** 10/5 10/20 11/5 After Nov 30 -
Sandhill Crane *** 10/7 10/18 10/31 11/13 After Nov 30
Horned Grebe *** 10/8 10/21 11/6 11/22 After Nov 30
Gadwall ****! 10/9 10/20 11/7 After Nov 30 -
Northern Pintail *** 10/10 10/23 11/6 After Nov 30 -
Ring-billed Gull *** 10/11 10/23 11/10 After Nov 30 -
Rough-legged Hawk *** 10/12 10/29 After Nov 30 - -
Ruddy Duck ****! 10/13 10/24 11/6 11/21 After Nov 30
Mallard ****! 10/14 10/31 11/17 After Nov 30 -
Ring-necked Duck *** 10/16 10/25 11/5 11/14 11/19
Common Loon *** 10/16 10/27 11/11 After Nov 30 -
Bonaparte's Gull *** 10/16 10/28 11/12 After Nov 30 -
Redhead *** 10/17 10/26 11/8 11/20 After Nov 30
Bald Eagle *** 10/17 11/10 After Nov 30 - -
Northern Shoveler ****! 10/19 10/27 11/7 11/19 After Nov 30
Canvasback *** 10/19 10/28 11/10 After Nov 30 -
Lesser Scaup ****! 10/21 10/30 11/12 After Nov 30 -

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Greater Yellowlegs * - 8/2 10/27 11/16 After Nov 30
Merlin * 8/19 9/6 10/24 11/8 11/24
American White Pelican ** 8/2 9/8 10/18 After Nov 30 -
Western Meadowlark *** 8/2 9/9 10/15 10/29 11/7
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
Double-crested Cormorant *** 9/10 9/26 10/23 After Nov 30 -
Red-winged Blackbird *** 9/12 9/26 10/22 After Nov 30 -
Red-tailed Hawk *** 9/5 9/27 10/27 11/9 After Nov 30
Yellow-bellied Sapsucker * 9/12 9/27 After Nov 30 - -
White-throated Sparrow *** 9/16 9/28 10/15 11/6 11/17
Eastern Meadowlark *** 9/21 10/1 10/17 11/7 11/19
Sharp-shinned Hawk ** 8/31 10/2 10/17 10/28 After Nov 30
Swamp Sparrow *** 9/21 10/2 10/16 11/2 11/14
Wilson's Snipe ** 8/2 10/3 10/18 11/3 11/16
Savannah Sparrow *** 9/13 10/3 10/15 10/29 11/8
Field Sparrow *** 9/20 10/4 10/18 11/4 11/15
Le Conte's Sparrow *** 9/25 10/4 10/16 10/28 11/7
American Avocet * 9/23 10/5 10/20 11/12 After Nov 30
Brown Creeper ** 9/18 10/5 After Nov 30 - -
American Pipit *** 9/17 10/6 10/24 11/12 After Nov 30
Song Sparrow *** 9/26 10/8 10/24 11/6 11/17
Pine Siskin ** 9/26 10/9 11/2 After Nov 30 -
Northern Harrier *** 9/12 10/11 10/28 11/12 After Nov 30
Golden-crowned Kinglet ** 9/25 10/12 11/5 11/15 After Nov 30
Dark-eyed Junco ****! 9/29 10/14 11/20 After Nov 30 -
Western Grebe * 9/6 10/17 10/31 After Nov 30 -
Greater White-fronted Goose *** 10/5 10/18 11/5 11/24 After Nov 30
Sandhill Crane *** 10/7 10/18 10/31 11/13 After Nov 30
Gadwall *** 10/9 10/20 11/7 After Nov 30 -
American Wigeon *** 10/4 10/20 11/4 11/20 After Nov 30
Green-winged Teal *** 10/5 10/20 11/5 After Nov 30 -
Horned Grebe *** 10/8 10/21 11/6 11/22 After Nov 30

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Killdeer *** - - Before Aug 1 11/4 After Nov 30
Wood Duck ** - 8/2 8/20 10/28 After Nov 30
Swainson's Hawk *** - 8/2 9/11 10/14 10/22
Blue-winged Teal *** 8/2 8/10 9/13 10/24 11/10
Great Egret *** - 8/2 9/13 10/20 11/11
Nashville Warbler *** 8/27 9/5 9/22 10/14 10/24
Cooper's Hawk ** 8/2 9/5 9/24 10/24 11/8
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
Sora * - 8/2 9/27 10/20 11/4
Scissor-tailed Flycatcher *** 9/6 9/16 9/27 10/19 11/1
Red-shouldered Hawk * 8/2 9/7 9/29 10/28 11/25
Northern Flicker *** 9/7 9/16 10/1 11/4 11/13
Chipping Sparrow *** 9/20 9/24 10/1 11/1 11/13
Orange-crowned Warbler *** 9/5 9/21 10/4 10/17 10/28
Common Grackle *** 9/13 9/20 10/6 10/29 After Nov 30
Ruby-crowned Kinglet *** 9/7 9/21 10/8 10/24 11/8
Sedge Wren *** 9/19 9/28 10/9 10/21 10/31
Marsh Wren *** 9/14 9/27 10/9 10/23 11/5
Spotted Towhee *** 9/9 9/23 10/9 10/25 11/6
Vesper Sparrow *** 9/7 9/23 10/10 10/27 11/6
Nelson's Sparrow ** 9/23 9/30 10/10 10/21 10/29
Sprague's Pipit * 9/19 9/29 10/11 10/25 11/6
Yellow-rumped Warbler *** 9/15 9/26 10/11 10/24 11/15
Lincoln's Sparrow *** 9/6 9/21 10/11 10/29 11/10
Savannah Sparrow *** 9/13 10/3 10/15 10/29 11/8
White-throated Sparrow *** 9/16 9/28 10/15 11/6 11/17
Western Meadowlark *** 8/2 9/9 10/15 10/29 11/7
Franklin's Gull *** 9/3 9/16 10/16 11/7 After Nov 30
Le Conte's Sparrow *** 9/25 10/4 10/16 10/28 11/7
Swamp Sparrow *** 9/21 10/2 10/16 11/2 11/14
Sharp-shinned Hawk ** 8/31 10/2 10/17 10/28 After Nov 30
Eastern Meadowlark *** 9/21 10/1 10/17 11/7 11/19
American White Pelican *** 8/2 9/8 10/18 After Nov 30 -
Wilson's Snipe ** 8/2 10/3 10/18 11/3 11/16
Field Sparrow *** 9/20 10/4 10/18 11/4 11/15
American Avocet *** 9/23 10/5 10/20 11/12 After Nov 30

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black-bellied Plover * - 8/2 8/21 9/1 11/21
Pectoral Sandpiper ** - - Before Aug 1 9/2 10/23
Tree Swallow ** - - Before Aug 1 9/9 11/1
Forster's Tern ** - 8/2 8/20 9/10 10/19
Lesser Yellowlegs ** - 8/2 8/20 9/13 11/8
Black-crowned Night-Heron * - 8/2 8/27 9/27 10/28
Blue-headed Vireo *** 8/25 9/2 9/16 9/28 10/24
Red-necked Phalarope * 8/2 8/22 9/7 9/29 10/15
Cattle Egret * - - Before Aug 1 10/1 11/2
White-faced Ibis * - 8/2 9/1 10/2 10/30
Tennessee Warbler * 8/2 8/9 9/9 10/3 10/23
Mourning Dove *** - 8/2 8/17 10/4 10/25
Summer Tanager *** 9/2 9/10 9/20 10/4 10/14
Snowy Egret ** - 8/2 8/20 10/5 10/26
Osprey *** 8/28 9/9 9/23 10/6 11/11
House Wren *** 8/25 9/1 9/11 10/6 10/20
Sanderling * 8/2 8/20 9/6 10/7 10/26
Northern Rough-winged Swallow ** - - Before Aug 1 10/7 10/23
Peregrine Falcon * 8/2 9/13 9/24 10/9 10/23
Chimney Swift *** - 8/2 8/15 10/11 10/20
American Golden-Plover * 8/12 9/22 9/30 10/12 11/16
Eastern Phoebe *** 9/1 9/13 9/25 10/12 10/25
Common Yellowthroat *** 8/30 9/6 9/20 10/12 10/21
Indigo Bunting *** 9/7 9/11 9/20 10/12 10/21
Black-throated Green Warbler * 8/20 9/2 9/22 10/13 10/28
Swainson's Hawk *** - 8/2 9/11 10/14 10/22
Nashville Warbler *** 8/27 9/5 9/22 10/14 10/24
Turkey Vulture *** 8/2 9/4 9/27 10/16 10/25
Clay-colored Sparrow *** 8/20 9/3 9/24 10/16 10/30
Orange-crowned Warbler *** 9/5 9/21 10/4 10/17 10/28
Scissor-tailed Flycatcher *** 9/6 9/16 9/27 10/19 11/1
Great Egret *** - 8/2 9/13 10/20 11/11
Sora * - 8/2 9/27 10/20 11/4
Sedge Wren *** 9/19 9/28 10/9 10/21 10/31
Nelson's Sparrow ** 9/23 9/30 10/10 10/21 10/29

West

Light to moderate flights will be scattered across the region where favorable migration conditions occur. Some of these flights, notably in the eastern Rockies on Saturday night, may be locally more intense. By Sunday and Monday these movements become even more restricted, primarily to the Desert Southwest and northern Rockies. By the middle of the work week flights are even more widely scattered, before diminishing to their smallest extents on Thursday. The end of the period sees the next disturbance arrive to the Pacific Coast, offering a glimpse of more favorable conditions to come in the next period.

Yellow-rumped Warbler. Hallie Daly/Macaulay Library. eBird S39887743.

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 -
California Gull * 8/2 10/22 11/7 After Nov 30 -
Ring-billed Gull ** 8/10 11/7 11/22 After Nov 30 -
Northern Harrier ** 8/17 11/8 11/20 After Nov 30 -
Red-necked Grebe * 8/26 10/20 11/3 11/13 11/20
American Wigeon *** 9/2 10/17 11/22 After Nov 30 -
Sandhill Crane * 9/14 11/10 11/18 After Nov 30 -
Horned Grebe ** 9/20 10/21 11/8 11/15 11/19
Ring-necked Duck *** 9/21 10/17 11/20 After Nov 30 -
Ruddy Duck *** 9/21 10/14 11/18 After Nov 30 -
Bald Eagle ** 9/26 10/19 After Nov 30 - -
Mew Gull ** 10/1 10/22 11/20 After Nov 30 -
Redhead ** 10/3 10/14 11/14 After Nov 30 -
Western Grebe *** 10/3 10/14 11/2 After Nov 30 -
Dunlin *** 10/5 10/15 10/30 After Nov 30 -
Gadwall *** 10/7 10/25 11/17 After Nov 30 -
Surf Scoter *** 10/7 10/21 11/10 11/15 11/18
Greater Scaup ** 10/8 10/20 After Nov 30 - -
Lesser Scaup *** 10/8 10/26 11/19 After Nov 30 -
Clark's Grebe * 10/8 10/18 11/6 After Nov 30 -
Canvasback *** 10/9 11/4 11/19 After Nov 30 -
Glaucous-winged Gull ** 10/10 10/23 After Nov 30 - -
White-winged Scoter * 10/11 10/20 11/5 11/15 After Nov 30
Common Loon *** 10/12 10/23 11/4 11/14 11/22
Rough-legged Hawk * 10/12 11/29 After Nov 30 - -
Pacific Loon * 10/14 10/29 11/24 After Nov 30 -
Bufflehead ****! 10/16 10/29 After Nov 30 - -
Bonaparte's Gull *** 10/17 10/28 11/10 After Nov 30 -
Hooded Merganser *** 10/19 11/2 After Nov 30 - -
Red-breasted Merganser *** 10/20 11/2 11/20 After Nov 30 -
Trumpeter Swan * 10/21 11/4 After Nov 30 - -

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Belted Kingfisher ** - 8/2 10/22 After Nov 30 -
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 -
Black Phoebe ** 8/16 9/9 11/17 After Nov 30 -
Sharp-shinned Hawk * 8/23 9/10 10/19 11/11 After Nov 30
Red-tailed Hawk *** 8/7 9/10 After Nov 30 - -
American Pipit ** 8/31 9/11 11/15 After Nov 30 -
Say's Phoebe ** 9/1 9/13 11/21 After Nov 30 -
Merlin * 8/30 9/14 11/9 11/28 After Nov 30
Eared Grebe *** 9/2 9/16 11/11 After Nov 30 -
Marsh Wren * 8/21 9/20 10/29 After Nov 30 -
Fox Sparrow *** 9/9 9/23 10/20 11/1 11/8
Golden-crowned Sparrow *** 9/13 9/26 10/19 10/26 11/18
Yellow-rumped Warbler ****! 9/13 9/27 10/14 10/23 11/3
Northern Flicker *** 9/5 9/29 10/16 11/8 11/22
Varied Thrush ** 9/18 9/29 After Nov 30 - -
Western Meadowlark *** 9/16 9/30 10/16 After Nov 30 -
Cackling Goose ** 9/16 10/3 After Nov 30 - -
Ruby-crowned Kinglet *** 9/21 10/3 11/5 11/10 11/12
White-throated Sparrow * 9/20 10/3 10/28 11/5 11/10
Golden-crowned Kinglet ** 9/10 10/4 10/23 11/6 11/18
Dark-eyed Junco *** 9/23 10/5 11/8 11/13 11/16
Hermit Thrush *** 9/25 10/6 10/26 11/6 11/15
Herring Gull ** 9/28 10/13 After Nov 30 - -
Redhead * 10/3 10/14 11/14 After Nov 30 -
Ruddy Duck ** 9/21 10/14 11/18 After Nov 30 -
Western Grebe *** 10/3 10/14 11/2 After Nov 30 -
Dunlin ** 10/5 10/15 10/30 After Nov 30 -
American Wigeon *** 9/2 10/17 11/22 After Nov 30 -
Ring-necked Duck *** 9/21 10/17 11/20 After Nov 30 -
Clark's Grebe * 10/8 10/18 11/6 After Nov 30 -
Pied-billed Grebe ** 8/2 10/19 11/11 After Nov 30 -
Bald Eagle ** 9/26 10/19 After Nov 30 - -
Greater Scaup * 10/8 10/20 After Nov 30 - -
White-winged Scoter * 10/11 10/20 11/5 11/15 After Nov 30
Red-necked Grebe * 8/26 10/20 11/3 11/13 11/20
Surf Scoter ** 10/7 10/21 11/10 11/15 11/18
Horned Grebe ** 9/20 10/21 11/8 11/15 11/19

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Greater Yellowlegs * 8/11 8/18 8/28 After Nov 30 -
Elegant Tern * 8/2 8/21 9/7 After Nov 30 -
Red-breasted Nuthatch * - 8/2 9/7 10/19 10/30
Chipping Sparrow *** - 8/2 9/8 10/18 11/2
Pink-footed Shearwater * 8/8 8/27 9/14 10/25 11/7
Clay-colored Sparrow * 8/17 8/28 9/14 10/18 11/6
Orange-crowned Warbler *** 8/18 9/1 9/18 10/15 10/27
Mountain Bluebird * 9/3 9/8 9/19 10/17 10/27
Blue-winged Teal * - 8/2 9/22 10/23 11/3
Savannah Sparrow ** 8/2 9/3 9/23 10/24 11/2
Brewer's Blackbird ** 8/23 9/11 9/27 10/20 After Nov 30
Black-bellied Plover * 9/12 9/18 9/30 After Nov 30 -
Cooper's Hawk * 8/2 9/7 10/1 10/24 11/11
Townsend's Warbler ** 8/13 8/30 10/2 10/22 11/6
Red-shouldered Hawk * 8/17 9/12 10/3 After Nov 30 -
Black-throated Gray Warbler *** - 8/2 10/4 10/19 10/29
Lincoln's Sparrow ** 8/30 9/11 10/4 10/21 11/5
Red-naped Sapsucker * 9/6 9/19 10/7 10/22 11/3
American Robin ** 8/30 9/4 10/10 10/17 11/14
Red-winged Blackbird ** 8/25 9/12 10/10 10/27 After Nov 30
White-crowned Sparrow *** 9/6 9/21 10/11 10/21 10/31
Yellow-rumped Warbler *** 9/13 9/27 10/14 10/23 11/3
Northern Flicker *** 9/5 9/29 10/16 11/8 11/22
Western Meadowlark * 9/16 9/30 10/16 After Nov 30 -
Sharp-shinned Hawk * 8/23 9/10 10/19 11/11 After Nov 30
Golden-crowned Sparrow * 9/13 9/26 10/19 10/26 11/18
Fox Sparrow * 9/9 9/23 10/20 11/1 11/8

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Violet-green Swallow *** - - Before Aug 1 8/3 10/23
Hermit Warbler * - 8/2 8/19 9/3 10/23
House Wren *** 8/23 8/31 9/9 9/21 10/26
Green Heron * 8/2 8/10 8/28 9/23 10/17
Sora * 8/21 9/1 9/13 9/23 After Nov 30
American White Pelican * 8/2 8/13 9/2 9/27 10/19
Vesper Sparrow ** 8/24 9/2 9/13 9/27 10/15
Marbled Godwit * 8/9 8/17 8/28 9/29 After Nov 30
American Avocet * 8/15 8/21 8/30 9/30 After Nov 30
Parasitic Jaeger * 8/26 9/6 9/19 10/1 10/29
Black Turnstone * 8/6 8/17 9/21 10/2 After Nov 30
Heermann's Gull * 8/15 9/14 9/21 10/2 After Nov 30
Yellow Warbler *** - 8/2 9/8 10/2 10/21
Killdeer *** 8/2 8/14 9/7 10/3 11/3
Franklin's Gull * - 8/2 8/31 10/3 11/5
Vaux's Swift ** 8/28 9/5 9/14 10/3 10/20
Pacific-slope Flycatcher *** 8/14 8/25 9/12 10/3 10/17
Turkey Vulture *** 8/14 9/9 9/17 10/5 10/17
Common Yellowthroat *** 8/18 8/30 9/15 10/5 10/27
Pectoral Sandpiper ** 8/16 8/25 9/20 10/9 10/24
Greater White-fronted Goose ** 9/13 9/21 10/3 10/12 10/19
Orange-crowned Warbler *** 8/18 9/1 9/18 10/15 10/27
Mountain Bluebird * 9/3 9/8 9/19 10/17 10/27
American Robin * 8/30 9/4 10/10 10/17 11/14
Chipping Sparrow *** - 8/2 9/8 10/18 11/2
Clay-colored Sparrow * 8/17 8/28 9/14 10/18 11/6
Red-breasted Nuthatch *** - 8/2 9/7 10/19 10/30
Black-throated Gray Warbler *** - 8/2 10/4 10/19 10/29
Brewer's Blackbird * 8/23 9/11 9/27 10/20 After Nov 30
Lincoln's Sparrow ** 8/30 9/11 10/4 10/21 11/5
White-crowned Sparrow *** 9/6 9/21 10/11 10/21 10/31

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Farnsworth and Van Doren

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