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Marginal and locally favorable migration conditions early in the period eventually yield to slightly more widespread favorable migration conditions, featuring Northern Shoveler, Eared Grebe, Belted Kingfisher, Orange-crowned Warbler, Townsend’s Warbler, Savannah Sparrow, and White-crowned Sparrow in the West and Bald Eagle, Chimney Swift, Northern Flicker, Merlin, Blue-headed Vireo, White-eyed Vireo, Magnolia Warbler, Pine Warbler, Common Yellowthroat, and Wilson’s Warbler in the East.

Favorable conditions mid period bring light to moderate movements of American Wigeon, Ring-necked Duck, Pied-billed Grebe, Bale Eagle, Northern Flicker, and Yellow-rumped Warbler to the West, while moderate to very heavy weekend movements of Gadwall, Ruddy Duck, Horned Grebe, Sandhill Crane, Ruby-crowned Kinglet, Yellow-rumped Warbler, Eastern Meadowlark, and Fox Sparrow take flight in the East.

Continental Summary Changeable conditions in the West and the East bring pulses and pockets of moderate to very heavy movements this week among numerous disturbances moving east across the country. Species on the move this week will include numerous shorebirds,…

Pulses of favorable migration conditions this week in the West will bring moderate flights featuring Turkey Vulture, Pectoral Sandpiper, Parasitic Jaeger, Common Tern, Mountain Bluebird, Summer Tanager, and Orange-crowned Warbler, while the East experiences scattered moderate to heavy flights featuring Eastern Wood-Pewee, Yellow-bellied Flycatcher, Red-eyed Vireo, Blue-headed Vireo, Swainson’s Thrush, Magnolia Warbler, and Common Yellowthroat when conditions allow. Another tropical system off the Atlantic coast brings potential for interesting observations, as does a tropical system moving across the Gulf of California and into the southern Rockies and western Texas.

Continental Summary This week’s migration forecast highlights favorable conditions for migrant arrivals in the Gulf Coast region and unfavorable conditions for migrants to advance into much of the West, Great Plains and Upper Midwest and Northeast because of late winter-early…

Continental Summary A patchwork of marginal and locally favorable conditions bring scattered light to moderate movements across the continent this week. Species on the move this week will include Green-winged Teal, Black-bellied Plover, Solitary Sandpiper, Upland Sandpiper, Least Sandpiper, Olive-sided…

Increasingly favorable conditions for light to moderate movements will build across the West for the work week, featuring Green Heron, Marbled Godwit, Short-billed Dowitcher, Cassin’s Vireo, Barn Swallow, Gray Flycatcher, and Summer Tanager, while the East experiences moderate to heavy flights of Broad-winged Hawk, Sora, Semipalmated Plover, American Avocet, Barn Swallow, Wood Thrush, Black-and-white Warbler, Prothonotary Warbler, Scarlet Tanager, Rose-breasted Grosbeak, Baltimore Oriole, and Lark Sparrow in the Plains for the first half of the period and similarly intense movements farther east later in the period.

Favorable migration conditions do not arrive in the West until mid period, bringing light to moderate flights of Redhead, Ruddy Duck, Red-tailed Hawk, Northern Flicker, Hermit Thrush, Yellow-rumped Warbler, Western Meadowlark, Fox Sparrow, Golden-crowned Sparrow, and Dark-eyed Junco, while a warming trend in the East yields to more typical fall conditions featuring moderate to heavy movements of Pied-billed Grebe, Franklin’s Gull, Northern Flicker, American Kestrel, Eastern Bluebird, Ruby-crowned Kinglet, Red-winged Blackbird, White-throated Sparrow, and Dark-eyed Junco.

Scattered favorable conditions primary in the middle of the forecast period will see light to moderate flights of Green Heron, Western Sandpiper, Red-necked Phalarope, Olive-sided Flycatcher, Hammond’s Flycatcher, Warbling Vireo, and Townsend’s Warbler for the West, while widespread favorable migration bring moderate to heavy flights in many areas of the East and will feature Sora, Least Sandpiper, Semipalmated Sandpiper, Common Nighthawk, Blue-headed Vireo, Kentucky Warbler, Summer Tanager, and Painted Bunting. Continued unfavorable conditions in many areas of northern Central America will slow the typical seasonal pulses of trans-Gulf migration.

Continental Summary: Major movements begin the period in the East and West, followed by periods of less favorable conditions until another pulse of movements end the forecast period. Birds on the move this week will include Broad-winged and Sharp-shinned Hawk,…

Continental Summary Marginal conditions that begin the period in the West become more favorable for increasingly widespread light to moderate movements over the course of the forecast period, while the East experiences several bouts of favorable winds and warming temperatures…

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.