ALASKA EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 101 PM EST TUE FEB 17 2015 VALID 12Z SAT FEB 21 2015 - 12Z WED FEB 25 2015 NO MAJOR CHANGES PLANNED---WITH THE 17/00Z ECENS/NAEFS MAINTAINING THE LONGWAVE TROUGH VERY CLOSE TO WHERE IT HAS BEEN FOR THE BETTER PART OF A WEEK---AND THE UPPER LEVEL RIDGE BETWEEN 130W-140W. AND FOR THE MOST PART---THE BROAD WARMING TREND ACROSS THE INTERIOR---AND A SLIGHT WESTWARD PUSH OF COLDER AIR PERIODICALLY INTO THE PANHANDLE---REMAINS IN PLAY FOR MOST OF THIS MEDIUM RANGE PERIOD. AS MENTIONED YESTERDAY...THE GUIDANCE SPREAD CONTINUES TO BE INVOF NORTHEAST SIBERIA AND THE SOUTHEASTWARD PUSH OF A 'FRESH' ARCTIC AIRMASS ACROSS THE BERING STRAIT AND INTO THE NORTHWEST COAST OF THE STATE. THE CURRENT TEMPERATURES GRIDS (BLENDED MEANS) DID NOT SUPPORT AN APPRECIABLE COOL DOWN (HIGH TEMPERATURES---MAYBE DOWN 2-3F) ALONG THE WEST COAST IN THE DAY 7-8 TIME FRAME. BUT OVERALL...NOT MUCH CHANGE AND IF ANYTHING---A SLIGHT WARMING TREND ALONG THE NORTH SLOPE. VOJTESAK