Alaska Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
303 PM EDT Sat Jun 02 2018

Valid 12Z Wed Jun 06 2018 - 12Z Sun Jun 10 2018

Ensembles show strong upper ridging over Siberia (near 70N/120E)
with elongated ridging north of Hawai'i along 35N. This favors a
stretching of the upper low initially over the Bering Sea that
will translate eastward into the Gulf and eventually southern
Panhandle next weekend. Another area of upper ridging is forecast
to move westward north of the North Slope. This progressive
pattern will take a couple systems into the Panhandle Wed/Fri
before another heads out of the northern Central Pacific late in
the week. The recent GFS runs compared fairly well with the 00Z
ECMWF and the ensemble means to start the period, but then were
much quicker with the central Pacific system than the ensembles
and 00Z ECMWF/Canadian, which have all trended quicker than 24 hrs
ago. Rather than make a very large adjustment decided to rely on
the better consensus that was slower than the 12Z GFS. Otherwise,
the GFS was in line with the ensembles over much of the
mainland/interior. The focus for rain will be mostly over the
Panhandle but also through the interior with daytime instability
(LIs near and just below zero everyday). Temperatures will
generally be near to above average.

Fracasso


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