ALASKA EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 128 PM EST TUE FEB 24 2015 VALID 12Z SAT FEB 28 2015 - 12Z WED MAR 04 2015 THE ALASKA MEDIUM RANGE FORECAST WAS COMPILED USING A BLEND OF THE 24/00Z ECENS/NAEFS MEANS. WITH THE 24/00Z GEFS MEAN A SLIGHTLY-MORE-PROGRESSIVE SOLUTION FROM THE DATELINE EASTWARD---BOTH IN THE BERING SEA AND NORTH CENTRAL PACIFIC VERSUS THE ECENS MEANS---THOUGHT THE INCORPORATION OF THE NAEFS WILL BE A DECENT MIDDLE-GROUND "PLACEHOLDER" FOR EMBEDDED MID-LEVEL ENERGY INJECTING INTO THE UPPER-LEVEL TROUGH---ALONG 160W LONGITUDE. OVERALL...THE AMPLIFICATION OF THE MID-TO UPPER-LEVEL RIDGE ALONG 140W WILL BUILD A DOME OF MILDER AIR OVER THE STATE---WITH THE EASTWARD MIGRATION OF UPPER-LEVEL TROUGHING---GRADUALLY MODIFYING THE WARMTH AS A MIX OF MERGING CLOUD LAYERS AND LIGHT PRECIPITATION. THE COLD ADVECTION---APPROACHING THE STATE FROM THE WEST AND NORTHWEST---LOOKS TO BE A TRANSITORY FEATURE OF THE SYNOPTIC-SCALE PATTERN ON DAYS 4-5. VOJTESAK