Light to moderate movements, primarily in California and the Desert Southwest, in the first half of the week included Swainson’s Hawk, Franklin’s Gull, Barn Swallow, Cliff Swallow, Nashville Warbler, Common Grackle for the West, while scattered pulses of light to moderate movements reached a peak by the end of the week in the East and included Great Crested Flycatcher, Tree Swallow, Golden-crowned Kinglet, Chipping Sparrow, Swamp Sparrow, and Orchard Oriole.
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Other than a few bursts of light to moderate movements in the Upper Mississippi River valley, most of the region was quiet until Wednesday night. Moderate movements, with some heavy migration, occurred on this night from the western Great Lakes south and east toward the mid Atlantic coast. These movements occurred in largely favorable conditions in advance of a cold front moving through the Great Plains. This front continued through the region and nearly reached the Atlantic Coast on Thursday night, shutting down movements in its wake and spawning light to moderate coastal flights from Virginia to southern New England.
For most of the period, scattered light to locally moderate movements were the norm. But by Wednesday and Thursday night, increasingly favorable winds and warmer conditions brought more extensive movements. These were primarily moderate flights, but they extended from Texas to Florida. By Thursday night, some of these movements in central and northern Florida were moderate to heavy.
A few nights of light to moderate movements brought migrants into the region, but none of these movements were widespread. Early period movements were generally in the central and southern Plains. Tuesday night finally saw moderate movements from the northern (and central) Plains, where such flights have been generally understated this spring. But after these flights, conditions deteriorated with the passage of low pressure, keeping flights local, mostly light, and primarily southerly in extent.
California and the Desert Southwest saw a run of nights that spanned the forecast period on which light to moderate movements occurred. Arizona, as evident from Phoenix and Yuma radars, saw the greatest intensities of these movements. Aside from these parts of the West, scattered and local light movements in parts of the Pacific Northwest, Great Basin, and Montana brought migrant arrivals in small numbers.