Light and moderate flights featuring White-faced Ibis, Semipalmated Plover, Olive-sided Flycatcher, Red-faced Warbler, and Western Tanager were frequent in many areas of the West, while the East saw moderate and locally heavy flights featuring Spotted Sandpiper, Chimney Swift, Warbling Vireo, Red-eyed Vireo, Blackpoll Warbler, Cape May Warbler, and Prairie Warbler in the southerly flow ahead of a frontal boundary.
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Light to moderate flights occurred in many areas over the first half of the week. However, a passing low pressure center and precipitation associated with it and another upper level disturbance quieted the migration scene by Tuesday night. Southerly flow ahead of an approaching frontal boundary brought more favorable conditions for Wednesday and Thursday, with moderate and locally heavy flights in many areas east of the Ohio River Valley.
Moderate to locally heavy flights were scattered across the region for the weekend and first half of the workweek. Then, after soaking and intense rain associated with a very slow moving front continued east, a large exodus of moderate to heavy intensity occurred on Tuesday night. Similarly extensive albeit less intense movements occurred the following nights, with particularly heavy flights in portions of Texas, Florida, and parts of the Carolinas.
A slow moving frontal boundary crossing the region, and its unfavorable winds and precipitation, generally kept the migration scene quiet until Tuesday night, other than locally light flights where conditions were marginally more favorable for migration. Moderate flights resumed in the northern Plains on Tuesday night, in slightly more favorable migration conditions. Similarly, Wednesday night saw more extensive moderate flights, including in the northern and southern Plains states, as low pressure continued to move farther out of the region. However, upon the low’s departure from the region, a wave of cooler air kept movements light other than highly localized moderate flights along the Canadian border and in Oklahoma.
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Greater White-fronted Goose
American Tree Sparrow
Great Blue Heron
Red-faced Warbler. William Higgins/Macaulay Library. 18 Apr 2016. eBird S29048379.
Light and moderate flights were the norm for many areas west of the Rockies and in the Desert Southwest for the period. The Pacific Coast saw action for many nights early in the period, including moderate and locally heavy flights in California on the weekend. Some scattered precipitation, particularly in eastern and northern mountainous regions, kept movements light where it fell. The most extensive movements of the period were Wednesday and Thursday nights, when light to moderate flights occurred from California east through the central Rockies.