Skip Navigation Links 
NOAA logo - Click to go to the NOAA homepage National Weather Service   NWS logo - Click to go to the NWS homepage
The Weather Prediction Center



Follow the Weather Prediction Center on Facebook Follow the Weather Prediction Center on Twitter
NCEP Quarterly Newsletter
WPC Home
Analyses and Forecasts
   National High & Low
   WPC Discussions
   Surface Analysis
   Days ½-2½ CONUS
   Days 3-7 CONUS
   Days 4-8 Alaska
   Flood Outlook
   Winter Weather
   Storm Summaries
   Heat Index
   Tropical Products
   Daily Weather Map
   GIS Products
Current Watches/

Satellite and Radar Imagery
  GOES-East Satellite
  GOES-West Satellite
  National Radar
Product Archive
WPC Verification
   Medium Range
   Model Diagnostics
   Event Reviews
   Winter Weather
International Desks
Development and Training
WPC Overview
   About the WPC
   WPC History
   Other Sites
Meteorological Calculators
Contact Us
   About Our Site is the U.S. Government's official web portal to all federal, state, and local government web resources and services.
Alaska Extended Forecast Discussion
(Caution: Version displayed is not the latest version. - Issued 1954Z Jun 22, 2019)
Version Selection
Versions back from latest:  0   1   2   3   4   5   6   7   8   9   10   
Abbreviations and acronyms used in this product
View Alaska Map

Alaska Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
354 PM EDT Sat Jun 22 2019

Valid 12Z Wed Jun 26 2019 - 12Z Sun Jun 30 2019

A relatively benign weather pattern will persist across Alaska
during the medium range, with a persistent upper-level ridge axis
extending from the North Pacific across western mainland Alaska
north to the Arctic. Shortwave energy will traverse a mean upper
trough centered across the western Bering Sea/western Aleutians,
with a couple waves of low pressure will move through the mean
trough, with energy splitting as it encounters the ridge, either
deflecting north back into the mean Bering trough or east, well
south of Alaska across the north Pacific. Meanwhile, on the
eastern periphery of the upper ridge, weakening arctic cold fronts
should move southward, bringing a return to near or slightly below
average temperatures to the North Slope and eastern portions of
the Interior, along with the potential for isolated to scattered

The WPC forecast was based on a blend of the GFS and ECMWF during
days 4-5, with more weight placed on the GFS due to continued
better run-to-run consistency relative to the ECMWF. Increasing
weight was placed on ECENS and GEFS ensemble means from day 6
onward to account for increasing spread, including differences in
how solutions handle the upper ridge and the track of low pressure
systems traversing the mean upper trough.


Additional 3-7 Day Hazard information can be found on the WPC
medium range hazards chart at:

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