ALASKA EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 141 PM EST MON NOV 30 2015 VALID 12Z FRI DEC 04 2015 - 12Z TUE DEC 08 2015 ...MAJOR COASTAL LOWS MAINLY EFFECTING THE ALASKAN SRN/SERN TIER... ...GUIDANCE/UNCERTAINTY ASSESSMENT... THE LATEST WPC ALASKAN MEDIUM RANGE SURFACE FRONTS/PRESSURES AND 500 MB PROGS ALONG WITH THE HIGH RESOLUTION SENSIBLE WEATHER GRIDS HAVE BEEN PRIMARILY DERIVED FROM A COMPOSITE BLEND OF REASONABLY WELL CLUSTERED GUIDANCE FROM THE 00 UTC GEFS/ECMWF ENSEMBLE MEANS FOR MAX CONTINUITY. OPTED FOR ONLY MINIMAL INPUT FROM THE GFS/EC DETERMINISTIC MODELS IN A PATTERN WITH ABOVE NORMAL MID-LARGER SCALE PREDICTABILITY BUT LESS CERTAIN SMALLER SCALE EMBEDDED LOW DETAILS. ...WEATHER THREATS... THIS ACTIVE WEATHER PATTERN REMAINS HIGHLIGHTED NOT ONLY BY A SHORT RANGE LEAD LOW OVER THE GULF OF AK THAT LINGERS INTO FRI...BUT ALSO WITH A DEEP LOW TRACK HELD FROM SOUTH OF THE ALEUTIANS/SW AK TO THE GULF OF AK FRI INTO SUN AND YET AGAIN WITH A THIRD LOW ON TRACK UPSTREAM NEXT WEEKEND INTO EARLY NEXT WEEK. THESE STORMY LOWS WILL SUPPORT HIGHLY UNSETTLED WIND/WEATHER/WAVES. THIS WILL FOCUS A HEAVY PCPN PATTERN INLAND INTO COASTAL SRN AND ESPECIALLY SERN AK AS FURTHER ENHANCED INTO FAVORED TERRAIN WHERE VERY HIGH SNOW TOTALS WILL OCCUR. EXPECT MODEST ORGANIZED PCPN WILL WRAP AROUND THE LOWS BACK INTO THE ALEUTIANS/SW AK...AND THE FLOW ALSO REMAINS FAVORABLE FOR COLD AIR ADVECTION SHOWERS OFF THE OPEN BERING SEA UNDER MEAN LOW/TROUGHING ALOFT. EXPECT MORE LIMITED MOISTURE/SNOW WITH MID-UPPER LEVEL NRN STREAM TROUGHING CENTERING FOCUS OVER WRN AK BY MEDIUM RANGE TIME SCALE ALONG WITH SURFACE FRONTAL COOLING WELL DOWN THROUGH THE ALASKAN INTERIOR. SCHICHTEL