When, where, and how far will birds migrate? Our migration forecasts will answer these questions for the first time.
All but the latest of migrants already passed, this week saw in the primarily scattered light and highly localized moderate movements across the West, with late migrants featuring Olive-sided Flycatcher, Willow Flycatcher, Cedar Waxwing, and Townsend's Warbler, while the East saw its light to moderate flights concentrated in the center of the country and featuring primarily departures of Least Sandpiper, White-rumped Sandpiper, Short-billed Dowitcher, Cedar Waxwing, Swainson's Thrush, Tennessee Warbler, Blackpoll Warbler.
As the spring migration winds down for most species, this forecast period sees early week light to moderate movements in the West that feature Common Nighthawk, White-throated Swift, Warbling Vireo, Cedar Waxwing, and Gray Catbird and mostly moderate flights in the East that feature late season shorebirds, Least Tern, Yell0w-billed Cuckoo, Acadian Flycatcher, Alder Flycatcher, and Cedar Waxwing among other late season passerine migrants.
This period brought light to moderate flights that featured Western Sandpiper, Dunlin, Long-billed Dowitcher, Swainson's Thrush, and Cedar Waxwing to the West, primarily in the middle of the week and scattered from California to the Rockies and north to Canada, while the East enjoyed moderate to locally heavy early and later week flights that featured Black Skimmer, Common Nighthawk, Black-billed Cuckoo, Yellow-billed Cuckoo, Swainson's Thrush, Cedar Waxwing, and Dickcissel.
With peaks of spring movements in the rear view for most species, this week will see scattered light flights across much of the West, with moderate flights along the eastern front of the Rockies, that will feature Black Tern, Cordilleran Flycatcher, Willow Flycatcher, MacGillivray's Warbler, and Blue Grosbeak, and moderate to heavy midweek flights where and when precipitation does not fall in the East, featuring Black-bellied Plover, Black Tern, Olive-sided Flycatcher, Alder Flycatcher, Yellow-bellied Flycatcher, and Mourning Warbler.
A reasonable quiet late migration season week in the West featured movements of Black Tern, Olive-sided Flycatcher, Swainson's Thrush, Gray Catbird, Northern Waterthrush, American Redstart, particularly in the Desert Southwest and northern Rockies, while moderate to heavy flights in the East early in the week, featuring White-rumped Sandpiper, Sanderling, Black Skimmer, Eastern Wood-Pewee, Marsh Wren, Saltmarsh Sparrow, and Orchard Oriole, subsided as a more early spring like air mass arrived.
Scattered precipitation across the region this period will add a new dynamic to West, with light to moderate movements featuring Common Nighthawk, Western Wood-Pewee, Eastern Kingbird, Western Tanager, and Lazuli Bunting where precipitation is not falling mostly early in the week in the Southwest and central and southern Rockies, while an early period blast of moderate to heavy movements featuring White-rumped Sandpiper, Common Nighthawk, Willow Flycatcher, Yellow-bellied Flycatcher, Philadelphia Vireo, Tennessee Warbler, and Blackpoll Warbler gets swept aside with the passage of a strong frontal boundary in the middle of the week.