Migrants were active in the region this week in the West, with several pulses of light to moderate movements featuring Semipalmated Plover, Western Sandpiper, Varied Thrush, Nashville Warbler, Blue Grosbeak, and Western Tanager, while many areas of the East experienced moderate and locally heavy movements at times, particularly on Sunday and Monday nights in advance of a cold front, that featured American Bittern, Ruby-crowned Kinglet, House Wren, Yellow Warbler, White-crowned Sparrow, Rose-breasted Grosbeak, and Baltimore Oriole.
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Saturday evening’s moderate flights lit up midwestern radars, followed closely on Sunday by region wide light to moderate movements from the Great Lakes and Mississippi River to the Atlantic Coast. This flurry of activity occurred ahead of a strong cold front, that all but shut down movements in the East away from the immediate coast with its passage on Monday night. The remainder of the period saw much less widespread movements, with local light to moderate flights occurring in the western Great Lakes, Mississippi and Ohio River valleys, and New England from Tuesday through the end of the week.
The diverse array of weather forecast for the region came to pass, bringing moderate and occasional locally heavy flights to many areas over the course of the week. But precipitation shut down movements in many areas and spawned fallouts at various locations along the Gulf coast. Most notably, large numbers of birds were grounded in Alabama and Louisiana early in the period. In the aftermath of these fallouts, a large exodus occurred on Monday night, particularly noticeable from radars in Louisiana. Also of note this week, regular light to moderate flights from Cuba brought migrants to Florida and the southeastern US.
Another week of scattered light to moderate movements occurred in the Great Plains, punctuated by the passage of a strong frontal boundary on Sunday night. Most intense of these flights were the moderate movements in the northern Plains on Friday, Saturday, and Tuesday nights. Although slightly more regular flights of migrants passed through the central and southern Plains during the period, these were never widespread and often hampered by rain.
California and the Desert Southwest once again hosted the most extensive and intense migration activity to begin the period. These flights were light to moderate in most cases, but locally heavy at times, particularly on Tuesday night when they extended substantially farther north along the Pacific Coast. The second half of the week was much less extensive, with locally light to moderate activity continuing in the Desert Southwest on Tuesday night and California on Thursday night.