Common Nighthawk © Benjamin Van Doren

Continental Summary

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.

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 red will experience conditions that are favorable for migration, and areas where red 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

Upper Midwest and Northeast	Gulf Coast and Southeast
Great Plains	West

Upper Midwest and Northeast

A last ditch pulse of moderate to locally heavy flights will occur on Friday and Saturday night across the region in advance of an approaching colder air mass. Once this frontal boundary arrives late in the weekend, migration quiets substantially until mid week. Wednesday night sees a return of more favorable conditions, but these will be increasingly local to end the week; moderate flights will follow a similar pattern of more widespread flights on Wednesday night becoming increasingly localized on Thursday and Friday.

Henslow’s Sparrow © Benjamin Van Doren

Species on the Move

Beginning to Arrive What is this?

Arriving

Peaking

Departing

Gulf Coast and Southeast

A patchwork of conditions across the region will make for locally moderate to heavy flights that punctuate generally light migration. The latter half of the period, beginning Tuesday, will see slightly more extensive movements; however, note that at this late date in spring migration, much larger numbers of insects and bats are likely to co occur with birds, making for apparent but not true increases in bird migration magnitudes.

Acadian Flycatcher © Benjamin Van Doren

Beginning to Arrive What is this?

Arriving

Peaking

Departing

Great Plains

A quiet weekend start will give way to much increased activity by Sunday night, as warming temperatures and favorable winds will facilitate last ditch movements of migrants north and west to breeding areas. Moderate to locally heavy flights are likely. These movements will continue through the period, although forecast precipitation associated with a disturbance in the region will localize these movements for Wednesday, Thursday, and Friday.

Nelson’s Sparrow © Luke Seitz

Species on the Move

Beginning to Arrive What is this?

Arriving

Peaking

Departing

West

Favorable conditions for the first part of the forecast period bring late migrants to the region, with primarily light and locality moderate flights from the central and southern Rockies to the Pacific. These movements will become increasingly localized to the northern and southern tiers of the region as the period progress, eventually evident only from the Desert Southwest. These movements will also become increasingly light, with moderate flights blinking out by mid period.

White-throated Swift © Benjamin Van Doren

Species on the Move

Beginning to Arrive What is this?

Arriving

Peaking

Departing

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