Forecast and Analysis

Regional Migration Analysis: 5-12 September 2014

Andrew Farnsworth The Cornell Lab Sep 12, 2014

Continental Summary

Light to moderate movements were widespread across the West this week, while . Species on the move this week included American Wigeon, Broad-winged Hawk, Black-billed Cuckoo, Pacific-slope Flycatcher, Eastern Wood-Pewee, Red-eyed Vireo, Ruby-crowned Kinglet, American Redstart, Blackpoll, Tennessee, Chestnut-sided and Orange-crowned Warblers, White-crowned and Lincoln’s Sparrows, and Baltimore Oriole.


Light to moderate movements were widespread across the region during this forecast period. These movements included a suite of pulses through the Pacific Northwest and the Central Valley on the weekend and a large movement with some heavy flights in the Desert Southwest on Wednesday night. Species on the move this week included White-crowned Sparrow, Lincoln’s Sparrow, American Pipit, Ruby-crowned Kinglet, Fox Sparrow, Pacific-slope Flycatcher, Orange-crowned Warbler, American Kestrel, American Wigeon, and Say’s Phoebe.

Great Plains

Scattered moderate to locally heavy movements kicked off the weekend but became increasingly sparse during the days that followed. After the passage of more substantial storms on Tuesday night, the remainder of the week saw a return of moderate movements in a number of locations across the region. However, none of the movements were regionwide, as numerous scattered storms and a patchwork of favorable and unfavorable conditions kept migration provincial. One of the largest of the series of movements came to the southern Plains, where locally heavy movements followed the passage of a frontal boundary on Wednesday night. Species on the move this week included Gray Catbird, Eastern Phoebe, Indigo Bunting, Mountain Bluebird, White-eyed Vireo, Broad-winged Hawk, Osprey, and Black-billed Cuckoo.

Upper Midwest and Northeast

Moderate to heavy, and even locally very heavy movements kicked off the weekend in the Midwest behind the passage of a strong frontal boundary. As this system pushed east, so did the moderate to heavy movements, finally reaching the coast by Sunday night. A period of relative calm followed as less favorable and more summer like conditions, as well as precipitation, returned to many areas for the beginning of the week. But another frontal passage spurred a new round of moderate to heavy flights to end the week. Thursday saw these movements reach their greatest extents, from the Upper Midwest through DelMarVa and northern New England; however, the largest movements were primarily west of the Appalachians. Species on the move this week included Swainson’s Thrush, Blackpoll Warbler, Palm Warbler, Tennessee Warbler, Northern Parula, Philadelphia Vireo, American Redstart, Nashville Warbler, Magnolia Warbler, Canada Goose, Blue Jay, Lincoln’s Sparrow, Black-throated Green Warbler, Cape May Warbler, and Northern Flicker.

Gulf Coast and Southeast

Moderate to heavy movements occurred over the weekend in many areas, even among scattered showers in some coastal and mountain locations. These movements diminished over the early part of the work week, becoming increasingly eastern in distribution by Tuesday and Wednesday. Movements were primarily occurring in the southeastern coastal Plain on these nights. But by the end of the period, more widespread movements returned, albeit at primarily light to moderate intensities. Species on the move this week included American Redstart, Baltimore Oriole, Chestnut-sided Warbler, Red-eyed Vireo, Black-and-white Warbler, Least Flycatcher, Blackburnian Warbler, Northern Parula, Ovenbird, Prairie Warbler, Worm-eating Warbler, Eastern Wood-Pewee, Rose-breasted Grosbeak, and Pine Warbler.