Skip Navigation Links weather.gov 
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
   QPF
   PQPF
   Flood Outlook
   Winter Weather
   Storm Summaries
   Heat Index
   Tropical Products
   Daily Weather Map
   GIS Products
Current Watches/
Warnings

Satellite and Radar Imagery
   Satellite Images
   National Radar
Product Archive
WPC Verification
   QPF
   Medium Range
   Model Diagnostics
   Event Reviews
International Desks
Development and Training
   Development
WPC Overview
   About the WPC
   Staff
   WPC History
   Accomplishments
   Other Sites
   FAQs
Meteorological Calculators
Contact Us
   About Our Site
 
USA.gov 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 1750Z Feb 23, 2015)
 
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
1250 PM EST MON FEB 23 2015

VALID 12Z FRI FEB 27 2015 - 12Z TUE MAR 03 2015

THE WPC MEDIUM-RANGE PRODUCT SUITE WAS PRIMARILY DERIVED FROM A
50-50 BLEND OF VERY COMPATABLE GUIDANCE FROM THE 00 UTC GEFS/ECMWF
ENSEMBLE MEANS. THIS FORECAST APPROACH ACTS TO MITIGATE MUCH OF
THE EMBEDDED SYSTEM DIFFERENCES THAT ARE MORE EVIDENT IN THE
DETERMINISTIC MODELS...ESPECIALLY FROM NRN ALASKA INTO THE ARCTIC
OCEAN DAYS 4-8. THIS MAINTAINS GOOD WPC CONTINUITY.

AN AMPLIFIED/WARMING MID-UPPER LEVEL RIDGE ROBUSTLY BUILDS OVER
MUCH OF ALASKA BY FRI/DAY 4. MODEST WEEKEND BERING SEA BASED
SYSTEM PASSAGE TO OVER NWRN AND NRN ALASKA IS FOLLOWED BY POTENT
REBUILDING OF RIDGE AMPLITUDE SUN-NEXT TUE IN RESPONSE TO
AMPLIFIED UPSTREAM TROUGHS ALOFT/DEEP SURFACE LOW ENERGY RENEWED
APPROACH INTO THE BERING SEA. THIS LOW DEVELOPMENT SEEMS WELL
SUPPORTED BY LATEST WEST-CENTRAL PACIFIC WATER VAPOR IMAGERY.
ENERGY WORKS TOWARD WRN ALASKA BY DAYS 7/8 ALONG WITH A TRAILING
INFLUENCE DOWN THROUGH THE ALEUTIANS...ALL SLOWED BY THE LEAD
RIDGE. THE ERN ALEUTIANS/SWRN AK MAY ALSO BE EFFECTED THEN BY NERN
PACIFIC LOW APPROACH CUTTING NEWD UNDERNEATH/INTO THE ALASKAN
RIDGE.

SCHICHTEL