Forecast and Analysis

Regional Migration Analysis: 22-29 August 2014

Andrew Farnsworth The Cornell Lab Aug 29, 2014

Continental Summary

Scattered movements in the West were mostly light to moderate in intensity, in contrast to more widespread moderate and isolated heavy movements in the East. Species on the move this week included Baird’s Sandpiper, Common Nighthawk, Pacific-slope Flycatcher, Great Crested Flycatcher, Swainson’s Thrush, Warbling Vireo, Nashville, Wilson’s, Black-throated Blue, Yellow-throated, and Black-and-white Warblers, and Baltimore Oriole.


Scattered light to moderate movements were the norm this week across the region. Highlights of these movements included consistent flights in the Central Valley of California and a pulse of movements from mid to late week in the northern Rockies and plains of Montana. Species on the move this week included Pacific-slope Flycatcher, Anna’s Hummingbird, Baird’s Sandpiper, Savannah Sparrow, Swainson’s Thrush, and Clay-colored Sparrow.

Great Plains

Precipitation early and late in the period kept movements light during those times. However, a pulse of light to moderate, and even isolated heavy, movements occurred to begin the work week, primarily in central and northern Plains’ states. These were particularly evident Species on the move this week included Gray Catbird, Baltimore Oriole, Great Crested Flycatcher, Least Flycatcher, Ruby-throated Hummingbird, Olive-sided Flycatcher, Green Heron, Warbling Vireo, Wilson’s Warbler, and Canada Warbler.

Upper Midwest and Northeast

Scattered light to moderate movements occurred in many areas of the region during the weekend and early week. By Tuesday night these movements became more concentrated in favorable conditions over the Great Lakes and Mississippi River valley. As the more favorable conditions spread east, the movements became widespread on Wednesday night from the Great Lakes and Mississippi River east though the north Appalachians and New England. By Thursday night flights were primarily concentrated along the coast, with moderate movements from the mid Atlantic north in southern New England and the Hudson River valley. Species on the move this week included Magnolia Warbler, Tennessee Warbler, Chestnut-sided Warbler, Wilson’s Warbler, Warbling Vireo, Common Nighthawk, Yellow-throated Vireo, American Redstart, Blackburnian Warbler, Bay-breasted Warbler, Black-throated Blue Warbler, Black-throated Green Warbler, Nashville Warbler, and Red-eyed Vireo.

Gulf Coast and Southeast

Light to moderate movements were apparent across the entirety of the region for this forecast period. However, there is no question that many insects and bats probably compose these movements on many occasions, given the time of year and the intensities of movements. Species on the move this week included Pine Warbler, Chestnut-sided Warbler, Baltimore Oriole, Great Crested Flycatcher, Summer Tanager, American Redstart, Yellow-throated Warbler, Red-eyed Vireo, Blue-winged Warbler, Black-and-white Warbler, and Northern Parula.