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Light to moderate flights becomes increasingly likely in the West and will feature White-throated Swift, Willow Flycatcher, Western Wood-Pewee, Eastern Kingbird, Swainson’s Thrush, MacGillivray’s Warbler, and Western Tanager, as spring migration winds down, while scattered moderate to heavy flights featuring Black Tern, Common Nighthawk, Chimney Swift, Yellow-billed Cuckoo, Acadian Flycatcher, Philadelphia Vireo, Cedar Waxwing, and Mourning Warbler will punctuate the migration scene in the East amidst unsettled conditions.

Extensive moderate to heavy movements occur over many portions of the East during this period, representing a serious change of guard from the last later season Neotropical migrants and the growing waves of intracontinental migrants, while the West experiences a…

Light to moderate movements continue in the West amidst some scattered mountain precipitation, while the East has moderate to heavy movements and fallout potential interspersed between strong spring storm systems and the marginal to unfavorable conditions that trail them. Birds…

A patchwork of favorable conditions across northern reaches of the West, primarily, brings light to moderate flights featuring Pectoral Sandpiper, Orange-crowned Warbler, a suite of vagrant eastern warblers, Brewer’s Blackbird, and Savannah Sparrow, while a weekend cold front kicks off moderate to very heavy flights followed later in the period by another similarly intense pulse, both featuring Turkey Vulture, Broad-winged Hawk, Eastern Phoebe, Blue-headed Vireo, Blue Jay, Swainson’s Thrush, Northern Parula, Black-throated Blue Warbler, Nashville Warbler, Blue-winged Warbler, and Clay-colored Sparrow.

A general quiet late season period in the West will see scattered light flights in the middle of the work week that feature Northern Shoveler, Northern Pintail, Tundra Swan, Northern Harrier, Sandhill Crane, Mew Gull, and Say’s Phoebe, while two strong frontal passages will bring light to moderate late season flights of Canada Goose, Tundra Swan, Bufflehead, Long-tailed Duck, Red-throated Loon, American Pipit, White-throated Sparrow, and Dark-eyed Junco to the East.

An active weather week will be in store for the West and the East, the former experiencing a pulse of favorable conditions early with light to moderate flights followed by largely unfavorable conditions and the latter exhibiting nearly the opposite pattern. Flights in the east, when favorable conditions are present, will be moderate to locally heavy. Note also that two strong low pressure systems are forecast to move through the central and eastern portions of the US, creating concentration and fallout potential when and where they pass.

Conditions in the West are favorable for light to moderate migration featuring Green-winged Teal, Northern Shoveler, Red-tailed Hawk, Least Sandpiper, Red-necked Phalarope, Yellow Warbler, and MacGillivray’s Warbler in the first half of the forecast period, while moderate to heavy flights of Wood Duck, Lesser Yellowlegs, Least Sandpiper, Ruby-throated Hummingbird, Great Crested Flycatcher, Yellow Warbler, and Baltimore Oriole will follow the passage of a frontal system through the East late in the period.

Pulses of movements will track the advance of several low pressure systems across the continent this week, with those system producing light to moderate movements in the West and moderate to heavy movements in the East. Species on the move…

A week of scattered light movement in the West will stand in stark contrast to moderate to heavy flights for much of the week in the East. Species on the move this week will include Tundra Swan, Gadwall, Bufflehead, Canvasback, Hooded Merganser, Sandhill…

A week of often favorable migration conditions punctuated with scattered precipitation will see light to moderate flights in many areas of the West that will feature American White Pelican, Black-chinned Hummingbird, Pacific-slope Flycatcher, Orange-crowned Warbler, White-crowned Sparrow, and Hooded Oriole, while cooler temperatures in the East alternate with some pulses of marginally favorable migration conditions that feature light to moderate movements of Common Loon, Double-crested Cormorant, Broad-winged Hawk, Northern Flicker, Purple Martin, Golden-crowned Kinglet, and Prairie Warbler.

The West will experience light to moderate movements early and late in the forecast period, and locally midweek where scattered precipitation is not falling, as the East experiences a mostly marginal and unfavorable weather week that will allow mostly light…

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.