Strong westerly winds at elevation, pockets of rain and generally nasty conditions kept most migrants still headed north grounded last night. There was a little pocket of birds taking off from the Gray’s Harbor area – probably stragglers of the shorebird and water fowl variety. They didn’t get very far. There were some moderate and widespread returns from California’s Central Valley so this isn’t over yet – but close.
The arctic low has moved south and is still dragging in a cold air mass, condensing moisture as it arrives – there’s even snow at higher elevations. The center is up in BC so we’re getting the westerly winds at the bottom of the trough. There is a high pressure ridge organizing out in the Pacific but it’s effects are a few days out.
Nationally the migration was heaviest in the northern fetches of the Mississippi Flyway. The Atlantic Flyway was active in the Mid-Atlantic States. For details refer to the regional NEXRAD trackers found in the sidebar links. To take a look at the national migration picture click here where Paul Hurtado has archived last night’s event.
Admin Note: This is the last update for this season. I will probably do a final post in June where i’ll put up the intervening local radar loops for documentation. Other than that — barring some meltdown — TTFN, be back in the fall.
Left click for larger gallery view: