This period brought light to moderate flights that featured Western Sandpiper, Dunlin, Long-billed Dowitcher, Swainson’s Thrush, and Cedar Waxwing to the West, primarily in the middle of the week and scattered from California to the Rockies and north to Canada, while the East enjoyed moderate to locally heavy early and later week flights that featured Black Skimmer, Common Nighthawk, Black-billed Cuckoo, Yellow-billed Cuckoo, Swainson’s Thrush, Cedar Waxwing, and Dickcissel.
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Moderate to locally heavy flights overspread the region over the weekend, until a low pressure system set the brakes for most flights away from the Great Lakes and New England. In the wake of this frontal passage, primarily light to locally moderate flights were the norm of the rest of the work week, although these flights were not widespread or consistent in their spatial distribution.
Aside from locally moderate flights early in the period in the western portions of the region, primarily in Texas, this was a typical quiet, late season week. Isolated moderate movements in Florida on Friday night punctuated the otherwise lackluster light flights to the east of the Mississippi. Strong storms shut down most western movements on Monday and Thursday nights in Texas.
Moderate to locally heavy movements passed through the region this week. The northern Plains enjoyed these movements over the weekend, followed by the central and southern Plains on Sunday, Tuesday, and Wednesday nights. However, migration activity was certainly disrupted in many areas by significant and intense storms, particularly on Sunday, Wednesday, and Thursday nights.
Light but widely scattered flights in California, Montana, and New Mexico highlighted the weekend, as other parts of the regions saw little movement. By Tuesday and Wednesday light to locally moderate movements were slightly more widespread, from California through New Mexico and north into the central Rockies. Note that some areas, particularly in southern New Mexico, continued to experience isolated moderate movements, even late in the week. Note that local bat movements may have contributed significantly to some of these New Mexico radar returns early and late in the week.