Alaska Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
357 PM EDT Sat May 26 2018

Valid 12Z Wed May 30 2018 - 12Z Sun Jun 03 2018

Recent runs of the ECMWF and GFS looked reasonably aligned with
the large scale pattern over Alaska through next Friday.  However,
a decent amount of noise among ensemble members suggests there is
still quite a bit of uncertainty with the details of the forecast
(especially with the timing and intensity of a possible upper low
closing off in the Gulf of Alaska late next week), so the WPC
forecast still incorporated some continuity and ensemble means
into the Day 4-6 (Wed-Fri) blend.  By next weekend, model
solutions really begin to diverge with the evolution of the upper
low in the Gulf, and without one piece of deterministic guidance
offering much stability with the pattern, the WPC forecast was
heavily weighted towards ensemble means beyond Day 6 (Fri).       
 

WPC medium range Alaskan products including 500mb, surface
fronts/pressures progs and sensible weather grids can be found at:

http://www.wpc.ncep.noaa.gov/alaska/ak_5dayfcst500_wbg.gif
www.wpc.ncep.noaa.gov/alaska/akmedr.shtml
http://www.wpc.ncep.noaa.gov/alaska/ak_5km_gridsbody.html


Gerhardt