An active open and close of the forecast period in the West featured light to moderate movements primarily in the southern portion of the region and included Western Sandpiper, Franklin’s Gull, Cassin’s Vireo, Black-throated Gray Warbler, and Nashville Warbler, while increasingly widespread moderate movements punctuated the period in the East and included Franklin’s Gull, Ruby-crowned Kinglet, Common Yellowthroat, Chipping Sparrow, and Summer Tanager.
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What began as a quiet start in the wake of a strong cold front became widespread (with the exception of New England) light to moderate movements by Sunday night. However, this was the region’s greatest extent of migration for the week – unsettled weather over the remainder of the period kept migrants grounded in many areas, and where birds were flying movements were local and mostly light to moderate.
Scattered moderate flights over the weekend grew to cover the entirety of the region by Monday night. This intensity of migration continued, at the same region-wide extent, nearly through the remainder of the work week. Of particular note were widespread moderate movements on Tuesday night and similarly intense flights over Texas on Thursday night.
Quiet was the word for the region this week, with migrants stymied by some unfavorable conditions that included northerly winds and storms. When birds did fly, movements were light and moderate, but these were limited across space and in time. The most intense of the week’s movements occurred in the Dakotas on Saturday night; the most extensive were those flights in the central and southern Plains, primarily over several nights when light to locally moderate movements occurred.
California and the Desert Southwest cornered much of the region’s action. Light to moderate flights kicked off the weekend, generally decreasing thereafter through most of the work week. Scattered precipitation, among some other unfavorable conditions, kept birds grounded or mostly grounded in many other parts of the West. However, Thursday night saw a renewed pulse of activity, with migrants on the move in California in moderate levels, as well as over the Desert Southwest and the Pacific Northwest.