Regional Migration Analysis: 7-14 October 2016

White-crowned Sparrow. Bill Lee/Macaulay Library. eBird S32027821.

White-crowned Sparrow. Bill Lee/Macaulay Library. eBird S32027821.

Continental Summary

Locally light and moderate flights featuring Cackling Goose, Common Loon, Pacific Loon, White-winged Scoter, Ferruginous Hawk, Dunlin, Merlin, White-throated Sparrow, Golden-crowned Sparrow, and Fox Sparrow punctuated the migration scene in the West during this period, while an early and late pulse of moderate and heavy movements featuring Pied-billed Grebe, Black Vulture, Northern Harrier, Yellow-bellied Sapsucker, American Pipit, Marsh Wren, Orange-crowned Warbler, White-crowned Sparrow, Nelson’s Sparrow, Le Conte’s Sparrow, and Dark-eyed Junco graced the East.

Curious what birds will move next? Check out our forecast.

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
Great Plainsbirdcast_plains West
BirdCast West Region

Upper Midwest and Northeast

Moderate to locally very heavy flights were widespread in the region for the weekend as a strong frontal system passed. Moderate flights persisted into the beginning of the work week, though mostly in coastal locations where conditions remained favorable for flying. Farther west, southerly flow and scattered precipitation kept the scene much more quiet. By Wednesday night, another frontal boundary pushing through the Great Lakes and Ohio River Valley spawned moderate to heavy flights in the Upper Midwest. With the continued movement of this frontal boundary to the east, and eventually out of the region on Thursday night, moderate to locally heavy flights became more extensive.

Top Movers

Increasing

Species Increase from Last Week % of Checklists Reporting
White-crowned Sparrow 192% 7.4
Dark-eyed Junco 148% 7.8
White-throated Sparrow 105% 20.6
Golden-crowned Kinglet 121% 8.5
Swamp Sparrow 92% 10.9
Yellow-rumped Warbler 67% 23.4
Orange-crowned Warbler 133% 2.6
Ruby-crowned Kinglet 41% 12.7
Winter Wren 75% 2.6
Lincoln's Sparrow 66% 7.1
Nelson's Sparrow 139% 1.1
Ruddy Duck 79% 2.3
Brown Creeper 62% 4.5
Harris's Sparrow 133% 0.6
Fox Sparrow 156% 0.5
Pied-billed Grebe 52% 7.8
Yellow-bellied Sapsucker 41% 6.8
Ring-necked Duck 72% 0.9
Le Conte's Sparrow 172% 0.3
Northern Gannet 98% 0.7
Savannah Sparrow 37% 6.9
Northern Rough-winged Swallow 62% 2.3
Hermit Thrush 49% 2.2
Black Scoter 73% 0.8

Decreasing

Species Decrease from Last Week % of Checklists Reporting
Broad-winged Hawk -75% 1.3
Red-eyed Vireo -57% 6.1
White-eyed Vireo -57% 1.3
Ruby-throated Hummingbird -45% 5.8
Green Heron -50% 2.2
American Redstart -34% 9
Eastern Wood-Pewee -38% 5.9
Yellow-throated Vireo -69% 0.6
Swainson's Thrush -37% 5.7
Gray Catbird -26% 30.8
Philadelphia Vireo -53% 1.5
Brown Thrasher -40% 4.6
Pine Warbler -46% 3.3
Northern Parula -47% 6
Cedar Waxwing -30% 12.6
Warbling Vireo -80% 0.3
Least Sandpiper -46% 2.4
Semipalmated Sandpiper -56% 1.1
Semipalmated Plover -48% 1.6
Magnolia Warbler -36% 9.4
Chestnut-sided Warbler -40% 2.2
Lesser Yellowlegs -36% 3.1
House Wren -26% 8.6

Northern Harrier. Kris Petersen/Macaulay Library. eBird S32016848.

Northern Harrier. Kris Petersen/Macaulay Library. eBird S32016848.

Gulf Coast and Southeast

Moderate to very heavy flights were the norm across the region to begin the period. This was particularly true in more eastern locations with the favorable winds and clear skies associated with the passage of Hurricane Matthew. Some entrainment and displacement of seabirds was associated with the passage of this storm, including inland reports of Black-capped Petrel and Sooty Tern. The days that followed saw generally decreasing extents and intensities of flights, as more southerly flow less favorable to migration set up shop in the region. But migrants took flight again on Wednesday and Thursday nights in increasingly more widespread and intense flights as a cooler air mass with northerly winds arrive.

Top Movers

Increasing

Species Increase from Last Week % of Checklists Reporting
Ruby-crowned Kinglet 557% 5.7
Tennessee Warbler 119% 12.9
Nashville Warbler 248% 4.6
Palm Warbler 72% 12.3
House Wren 112% 5.4
Pied-billed Grebe 76% 10.2
Orange-crowned Warbler 674% 1.5
Yellow-rumped Warbler 300% 1.8
Swainson's Thrush 59% 14.1
Northern Waterthrush 101% 7.1
Gray Catbird 48% 22.3
Golden-winged Warbler 196% 2.5
Blackburnian Warbler 137% 4.6
Magnolia Warbler 49% 14.8
Peregrine Falcon 93% 3.6
Marsh Wren 166% 1.9
Northern Harrier 84% 4
Rose-breasted Grosbeak 46% 9.4
Northern Flicker 37% 13.2
American Kestrel 43% 8.2
Yellow-bellied Sapsucker 283% 0.9

Decreasing

Species Decrease from Last Week % of Checklists Reporting
Baltimore Oriole -46% 2.3
Eastern Kingbird -44% 1.8
Great Crested Flycatcher -34% 2.7
Cassin's Sparrow -82% 0
Orchard Oriole -59% 0.2
Gray Kingbird -73% 0.1
Purple Martin -53% 0.3
Semipalmated Sandpiper -42% 0.8
Prothonotary Warbler -50% 0.6
Green Heron -24% 7.6
Bell's Vireo -84% 0
Wilson's Phalarope -74% 0.1
Ruby-throated Hummingbird -11% 22
Short-billed Dowitcher -30% 1
Killdeer -11% 12.1
Common Nighthawk -36% 0.7
American Goldfinch -11% 9.2
Semipalmated Plover -18% 2.7
Louisiana Waterthrush -74% 0.1

Black Vulture. Brian Henderson/Macaulay Library. eBird S31992765.

Black Vulture. Brian Henderson/Macaulay Library. eBird S31992765.

Great Plains

Scattered moderate and heavy movements occurred on several days during the period, never reaching region wide extents. The northern and eastern Plains saw action to begin the period, continuing into the early part of the work week. The most intense flights of the week occurred in the central Plains on Tuesday night, amidst scattered precipitation of a passing low pressure system, and the following night in the central and southern Plains with the passage of this system.

Top Movers

Increasing

Species Increase from Last Week % of Checklists Reporting
Dark-eyed Junco 210% 11.6
Lincoln's Sparrow 105% 9.8
Ruby-crowned Kinglet 75% 20.1
California Gull 911% 2.1
Harris's Sparrow 96% 6.3
Black Vulture 566% 2.4
Yellow-rumped Warbler 73% 22.2
Bald Eagle 76% 11.5
Savannah Sparrow 74% 8.9
White-crowned Sparrow 73% 9.1
Golden-crowned Kinglet 228% 1.3
Swamp Sparrow 121% 2.4
White-throated Sparrow 40% 9.2
American Pipit 131% 2
Black-billed Magpie 168% 2.1
Song Sparrow 38% 8.3
White-breasted Nuthatch 27% 21.6
Brown Creeper 185% 1
Common Yellowthroat 47% 6
Vesper Sparrow 36% 7.1
Bonaparte's Gull 87% 1.4
Fox Sparrow 55% 1.4

Decreasing

Species Decrease from Last Week % of Checklists Reporting
Yellow Warbler -91% 0.3
Ruby-throated Hummingbird -64% 3.8
Common Tern -87% 0.1
Caspian Tern -99% 0
Wilson's Warbler -65% 1.5
Least Flycatcher -83% 0.5
Black-and-white Warbler -100% 0
Say's Phoebe -83% 0.2
Peregrine Falcon -58% 1.3
Snowy Egret -45% 3.7
American Wigeon -48% 1.9
Blue-winged Teal -38% 8.9
Great Horned Owl -49% 2.5
Chimney Swift -36% 8
Cattle Egret -55% 1.2
Common Nighthawk -48% 2
Semipalmated Sandpiper -61% 0.8
Green Heron -52% 0.6
Great Egret -21% 17.7
Barn Swallow -31% 10
Black Tern -63% 0.7
Northern Shoveler -20% 6.4
Least Sandpiper -34% 3.5
Brown Thrasher -49% 4.2

Ferruginous Hawk. Brooke Miller/Macaulay Library. eBird S31919065.

Ferruginous Hawk. Brooke Miller/Macaulay Library. eBird S31919065.

West

Locally moderate flights occurred in the region during the first half of the forecast period. These were notably in the Central Valley of California on Friday and Saturday nights, and also in the Pacific Northwest on Monday night. The second half of the period saw the greatest extent of movements on Tuesday night, with light to moderate flights scattered from the coastal mountain ranges east into the northern and southern Rockies. Light to moderate flights ended the period, particularly in more southerly reaches of the region. Note that isolated heavy movements also took place in New Mexico on Wednesday night, associated with more extensive flights to the east in favorable conditions behind a frontal passage.

Top Movers

Increasing

Species Increase from Last Week % of Checklists Reporting
Cackling Goose 83% 3.4
American Pipit 80% 7.2
Golden-crowned Sparrow 37% 16.1
Hermit Thrush 47% 4.2
Yellow-rumped Warbler 30% 27.7
Palm Warbler 281% 0.8
Common Loon 44% 4.2
Dunlin 89% 1.6
Fox Sparrow 35% 8.3
Ruby-crowned Kinglet 23% 15
Surf Scoter 41% 4.5
Greater White-fronted Goose 51% 2.7
White-throated Sparrow 109% 0.9
White-winged Scoter 76% 1.4
Bald Eagle 36% 4.2
Ferruginous Hawk 86% 0.9
White-crowned Sparrow 15% 34.5
American Wigeon 21% 8.6
Red-throated Pipit 1960% 0.2
Red-throated Loon 72% 1
Merlin 40% 2.7
Pacific Loon 46% 1.5
Golden-crowned Kinglet 21% 6.6
Greater Scaup 73% 0.6

Decreasing

Species Decrease from Last Week % of Checklists Reporting
Pacific-slope Flycatcher -57% 2
Wilson's Warbler -53% 4.4
Yellow Warbler -52% 4.7
Western Wood-Pewee -49% 1.9
White-faced Ibis -55% 1.8
Willow Flycatcher -59% 0.8
Caspian Tern -42% 2.3
Red-necked Phalarope -53% 0.9
Vaux's Swift -42% 1.4
Broad-tailed Hummingbird -57% 0.5
MacGillivray's Warbler -54% 0.7
Barn Swallow -36% 7
Western Tanager -36% 3.4
Lesser Nighthawk -90% 0
Black-chinned Hummingbird -43% 1.2
Sabine's Gull -61% 0.8
Hooded Oriole -74% 0.1
Cliff Swallow -70% 0.3
Violet-green Swallow -34% 1.8
Olive-sided Flycatcher -71% 0.1
Snowy Egret -25% 8.3
Wilson's Phalarope -76% 0.1
Dusky Flycatcher -79% 0.1
Blue Grosbeak -43% 0.6
Stilt Sandpiper -94% 0

–––––––––––––––––––––––––––––––––––

Farnsworth and Van Doren

Toggle Grid