US Final Extended Forecast thru May 29

The Global Numerical Models Continue To Show High-Latitude
Blocking From The Northeast Pacific To The North Atlantic Through
The Medium Range.

An Omega-Ish Flow Configuration Is Expected To Dominate North America Into Early Day 5--With Upper Lows Near Vancouver Island And Astride The Saint Lawrence River.

By Late Day 6, An Unseasonably Strong Jet Is Progged To Plunge Into The Pacific Northwest Coast Along 40n, Which Will Induce Large Height Rises Over Much Of The Eastern United States.

Thereafter. The Ensemble Means From The Gfs And Both The Canadian And European Centres Agree On This Theme, With The Deterministic Models Offering "Noisy"--Ie Unreliable--Depictions Of The Pattern Change. The European Centre Ensemble Mean Formed The Backbone Of The Manual Fronts And Pressures Days 3-7, With Its Stability Over The Past Several Model Cycles The Major Factor In Its Preference Over The Other Guidance.

Substantial Negative Departures From Normal In Temperature Are
Indicated For Much Of The East This Period, With More Modest
Negative Departures In The Pacific Northwest.

The Bulk Of The Precipitation East Of The Rockies Will Focus Along And North Of The Polar Front. Over The Northwest, Precipitation Will Be Less Organized Until Day 7, When The Strong Onshore Push Associated With The New Jet Wrings Out Pacific Moisture From Northern California Through Oregon And Washington.


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