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Pulses of light to moderate movements will follow the favorable conditions across the West, particularly early in the week, and will feature Lesser Yellowlegs, Dunlin, Bonaparte’s Gull, Caspian Tern, Vaux’s Swift, Black-throated Gray Warbler, Wilson’s Warbler, and Yellow-headed Blackbird, while the East sees moderate to heavy flights that track those favorable conditions early to mid week and that feature a large number of arrivals including Green Heron, Willet, Wilson’s Snipe, Red-eyed Vireo, Cliff Swallow, Yellow-throated Warbler, Kentucky Warbler, and Swamp Sparrow among many others.

An active beginning and end to 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.

Light to moderate movements featuring Green Heron, Osprey, Rufous Hummingbird, White-throated Swift, and Common Yellowthroat will be the norm from Friday through the middle of the coming work week in the West, as moderate to heavy flights come to many parts of the East and feature Ruddy Duck, Whimbrel, Northern Flicker, Tree Swallow, Golden-crowned Kinglet, Louisiana Waterthrush, and Indigo Bunting.

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.

Friday and Monday nights will be the most extensive of the light to moderate movements that occur in the West this week featuring Cassin’s Vireo, Tree Swallow, Orange-crowned Warbler, Common Yellowthroat, Black-throated Gray Warbler, White-crowned Sparrow, while several pulses of more extensive light to moderate movements grace the East from Saturday through Wednesday featuring Double-crested Cormorant, Osprey, Pectoral Sandpiper, Baird’s Sandpiper, Eastern Phoebe, Yellow-throated Vireo, Hooded Warbler, and Fox Sparrow.

While the West saw early and late forecast period light to moderate movements along the Pacific Coast and in the Desert Southwest including Broad-tailed Hummingbird, Orange-crowned Warbler, Black-headed Grosbeak, and Bullock’s Oriole, scattered light to moderate movements peaking on Tuesday and Wednesday nights including Greater White-fronted Goose, Blue-winged Teal, Barn Swallow, Brown Thrasher, Lapland Longspur, Vesper Sparrow, and Chipping Sparrow increased in the East.

Most of the movement in the West this period occur this weekend and early in the week, with light to moderate movements that will see increasing arrivals of Osprey, Rufous Hummingbird, Bell’s Vireo, and Hooded Oriole, while the East will experience the greatest intensity and extent of moderate movements from Monday through Thursday with increasing arrivals of Great Blue Heron, Great Egret, American Golden-Plover, Belted Kingfisher, Louisiana Waterthrush, and Song Sparrow.

Light to moderate migration, primarily in California and the Desert Southwest early in the period, brought increasing numbers of Bell’s Vireo, Lucy’s Warbler, Yellow Warbler, and Bullock’s Oriole to the West, while slightly more extensive light to moderate movements on Sunday and Monday nights, including Blue-winged Teal, Eastern Phoebe, Blue-headed Vireo, Tree Swallow, and Pine Warbler among other migrants, highlighted the period in the East.

Continental Summary Weekend birders can look forward to widespread light to moderate movements across the West, while Monday through Wednesday brings similarly widespread light to moderate flights in the East. Species on the move this week will include Blue-winged Teal, Turkey…

Continental Summary In light to moderate migration Mountain Bluebird, Hooded Oriole, Barn Swallow, and Lucy’s Warbler were on the move last weekend in the West, while Wood Duck, Killdeer, American Woodcock, and Northern Parula composed mid to late week flights in the East….

American Robin is a sure sign of spring for many, whether you wait patiently for the first migrants to scamper across a lawn that is (finally) not icy or white (can you tell that parts of the eastern US are very ready for…

BirdCast Regions For migration forecasts and analyses, we use the following divisions to represent the continental US. We use these regions because their component states have many migration patterns in common and because their component states’ proximity make for logical…