Alaska Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
307 PM EDT Fri Jun 08 2018

Valid 12Z Tue Jun 12 2018 - 12Z Sat Jun 16 2018

The Alaskan medium range forecast remains uncertain next week over
higher latitudes, but guidance has trended and become better
clustered with the idea that an arctic mid-upper level trough/low
and an associated series of impulses/height falls will dig
southward over the north slope and interior. This will result in
post-frontal cooling temperatures and an unsettled local weather
pattern with some scattered precipitation.

Underneath, model/ensembles remain much better clustered with a
series of organized maritime lows. A lead system should clip the
southern Gulf of Alaska early-mid next week in a weakening state
and spread modest moisture/precipitation into SERN Alaska. This
should be followed by an upstream low/frontal system tracking to
the south of the Aleutians slated to lift northeastward to the AK
peninsula in about a week and also spread some heavier
moisture/precipitation into southwest and southern Alaska.

Overall, the WPC Alaskan medium range product suite was mainly
derived from a blend of reasonably clustered 12 UTC GFS and 00 UTC
ECMWF/ECMWF ensemble mean guidance. This solution offers good WPC
continuity in a pattern with average predictability.

Schichtel

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