Alaska Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
241 PM EDT Mon Apr 02 2018

Valid 12Z Fri Apr 06 2018 - 12Z Tue Apr 10 2018

...Pattern Highlights/Threats and Guidance/Uncertainty
Assessment...

A well organized closed low will retrograde westward over southern
Alaska over the next few days and reach the Bering Sea by
Thursday. There is lingering potential for locally enhanced
western and southwestern Alaska snow into Friday. Energy and
modestly unsettled conditions are expected to split both into the
western Bering Sea and back into the Alaskan interior over the
weekend.

Well underneath, deepened north Pacific storms will track near the
Aleutians Friday-Saturday and again Sunday-Tuesday along with some
enhanced winds/waves and precipitation in a pattern with
subsequent storm tracks southeastward to well offshore over the
western then southern Gulf of Alaska. Otherwise, expect a
relatively benign threat pattern for the rest of Alaska in mainly
nondiscript flow.

The WPC Alaskan medium range product suite was mainly derived from
a composite blend of reasonably compatable/clustered GFS/ECMWF and
GEFS/NAEFS/ECMWF ensemble means days 4-8. Leaned weighting a bit
more on ensembles with time amid growing forecast spread to best
maintain WPC forecast continuity. 

Schichtel