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Species on the move included Least Sandpiper, White-rumped Sandpiper, Long-billed Dowitcher, Alder Flycatcher, Willow Flycatcher, Swainson’s Thrush, Tennessee Warbler, Connecticut Warbler, Northern Waterthrush, Wilson’s Warbler, White-throated Sparrow, White-crowned Sparrow, Blue Grosbeak, and Bobolink.

Species on the move included Bufflehead, Willet, Least Sandpiper, Long-billed…

Moderate to locally heavy flights occurred in many areas of the West this period and featured Cackling Goose, Greater White-fronted Goose, Ring-necked Duck, Merlin, American Pipit, Fox Sparrow, Golden-crowned Sparrow, and Lincoln’s Sparrow, while moderate to locally very heavy flights occurred in the East, featuring Sharp-shinned Hawk, Gray-cheeked Thrush, Ruby-crowned Kinglet, Yellow-rumped Warbler, Palm Warbler, Savannah Sparrow, Harris’ Sparrow, White-crowned Sparrow and White-throated Sparrow.

Spring migration continues to ramp up slowly, and early migrants such as Western Kingbird began appearing in numbers during the past week. This individual was photographed on 16 April 2007 by Brian Sullivan.

Scattered light migration occurred in several areas over…

Scattered light to moderate movements across the West and pulses of moderate movements in the northern Plains and Northeast highlight migration across the continent this past week. Species on the move this week included Green-winged Teal, Blue-winged Teal, Northern Pintail….

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.

Scattered light to moderate flights were the later period highlights in the West, while moderate to very heavy flights graced the later period in the East.

Light to moderate movements were widely scattered across the southern portions of the West this week, while scattered light to moderate movements highlighted an otherwise uneventful week of migration pulses in the East. Species on the move this week included…

Scattered light to moderate movements featuring American Wigeon, Sanderling, Yellow Warbler, Wilson’s Warbler, and Yellow-headed Blackbird highlighted the week in the West, while Black-bellied Plover, Wilson’s Phalarope, Common Nighthawk, Least Flycatcher, Chestnut-sided Warbler, Yellow Warbler, and Wilson’s Warbler composed generally light early period and increasing moderate and even isolated heavy later period movements in the East.

Moderate movements featuring Semipalmated Plover, Caspian Tern, Olive-sided Flycatcher, Warbling Vireo, Swainson’s Thrush, Nashville Warbler, and Western Tanager were the norm for California and the Desert Southwest, while moderate to locally heavy flights graced portions of the East and featured Spotted Sandpiper, Great Crested Flycatcher, Red-eyed Vireo, Wood Thrush, Blackpoll Warbler, Baltimore Oriole, and Dickcissel.

As the East pulsed with a major frontal passage and moderate to heavy movements in its wake, the West continued previous weeks’ pattern of many moderate movements. Birds on the move this week included Broad-winged Hawk, Northern Flicker, Warbling Vireo,…

Locally moderate flights occurred in the West during this period and featured Bufflehead, Lesser Scaup, Dunlin, Herring Gull, Mew Gull, Ruby-crowned Kinglet, Hermit Thrush, and American Pipit, while a significant pulse of moderate to very heavy flights occurred in the East and featured Brant, Bufflehead, Surf Scoter, American Coot, Bonaparte’s Gull, Hermit Thrush, Lapland Longspur, American Tree Sparrow, White-throated Sparrow, and Swamp Sparrow.

A quiet late season week in the West saw primarily scattered light movements, while a wild post-frontal passage ride of Franklin’s Gulls and Cave Swallows in the Northeast highlighted the period’s primarily localized light to moderate flights.