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Favorable migration conditions in the West will be localized and mostly occur at the end of the forecast period, when light to moderate movements, mostly in the northern reaches of the region, will feature Green-winged Teal, Northern Pintail, American Wigeon, Ring-necked Duck, Lesser Scaup, Eared Grebe, Western Grebe, Red-tailed Hawk, Hermit Thrush, Varied Thrush and American Pipit; meanwhile, the East will see a major frontal passage and arrival of cooler air that will usher moderate to very heavy movements to the region that feature Ruddy Duck, Common Loon, Double-crested Cormorant, Northern Harrier, Sandhill Crane, Belted Kingfisher, American Kestrel, House Wren, Fox Sparrow, Dark-eyed Junco, Pine Siskin, and Purple Finch.

Favorable conditions early in the period will bring moderate movements featuring Northern Pintail, Warbling Vireo, Swainson’s Thrush, Wilson’s Warbler, and Western Tanager in parts of the West, particularly the Pacific Northwest, while a passing cold front early in the week will bring moderate to locally heavy movements of Warbling Vireo, Red-eyed Vireo, Veery, Blue-gray Gnatcatcher, Ovenbird, Northern Waterthrush, Blackburnian Warbler, Chestnut-sided Warbler, and Rose-breasted Grosbeak in its wake before southerly flow slows down the system in the East.

Continental Summary: A pulse of moderate movements occurs midweek in the West, as the East experiences a major frontal passage followed by a building high pressure ridge that facilitate major movements over land and over water. Birds on the move…

Continental Summary A widespread movement in the West on Tuesday night will be followed by a similarly large-scale movement in the East on Thursday night. Species on the move this week will include Blue-winged Teal, Northern Pintail, Common Goldeneye, Common…

Several pulses of favorable migration conditions bring mid to late period moderate flights featuring Common Loon, Dunlin, Bonaparte’s Gull, Belted Kingfisher, Golden-crowned Kinglet, Ruby-crowned Kinglet, Marsh Wren, Hermit Thrush, and White-throated Sparrow to many areas of the West, while two frontal passages spawn moderate to very heavy flights featuring Double-crested Cormorant, Northern Harrier, Belted Kingfisher, Vesper Sparrow, Common Grackle, and Red-winged Blackbird in the East.

A late period arrival of favorable conditions will see light to moderate movements, primarily waterfowl, in the West, while the first half of the period in the East will see moderate flights scattered across the region.

A period of generally favorable migration conditions featuring light to moderate flights of Common Nighthawk, Broad-tailed Hummingbird, Willow Flycatcher, Common Yellowthroat, Grasshopper Sparrow, and Western Tanager is in store for much of the West, particularly in the Rockies, while an unfavorable cool and wet start to the East gives way to later week moderate to heavy flights of White-rumped Sandpiper, Dunlin, Red-necked Phalarope, Black Tern, Black-billed Cuckoo, Red-eyed Vireo, Mourning Warbler, and Scarlet Tanager.

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.

Marginal migration conditions begin the period, give way to more widespread flights to end the week in the West, and feature Northern Shoveler, Killdeer, Belted Kingfisher, Yellow Warbler, MacGillivray’s Warbler, Wilson’s Warbler, Savannah Sparrow, and Western Tanager, while favorable conditions kicking off the period in the East in many areas of the East, featuring Blue-winged Teal, Bald Eagle, Ruby-throated Hummingbird, Merlin, Least Flycatcher, Warbling Vireo, Red-eyed Vireo, American Redstart, Black-and-white Warbler, and Magnolia Warbler, give way to increasingly unfavorable conditions in part due to a decaying Hermine.

Favorable conditions begin and end the period in the West where light to moderate flights will feature Common Loon, Gadwall, Turkey Vulture, Ruby-crownd Kinglet, Yellow Warbler, and Lincoln’s Sparrow, while the non coastal East sees an extended period of favorable conditions bring moderate to heavy flights featuring Sharp-shinned Hawk, Northern Flicker, Blue-headed Vireo, Nashville Warbler, Pine Warbler, Palm Warbler, Lincoln’s Sparrow, and Western Meadowlark.

Continental Summary The West sees light movements away from scattered precipitation over the next week, particularly along the Pacific Coast, as light to locally moderate movements associated with the passage of high pressure in the East occur primarily the northern…

Continental Summary A busy early week of movements in the West shuts down by week’s end, while widespread favorable conditions arrive by mid to late week in the East and spawn moderate to heavy movements in many areas. Species on…