ALASKA EXTENDED FORECAST DISCUSSION...CORRECTION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 1253 PM EST SAT FEB 04 2017 VALID 12Z WED FEB 08 2017 - 12Z SUN FEB 12 2017 THE UPPER LEVEL PATTERN OVER ALASKA IS EXPECTED TO FEATURE INCREASED TROUGHING ALOFT WHICH SHOULD SLIGHTLY RETROGRADE INTO WESTERN AK AND THE ALEUTIANS WITH TIME. THE GUIDANCE SHOWS GENERAL AGREEMENT HERE, BETTER THAN YESTERDAY, THOUGH THE EXPECTED POSITION OF THE UPPER TROUGH AXIS REMAINS IN SOME DOUBT. THE 06Z GFS FEATURED A STRONG CLOSED LOW IN THE BERING SEA FROM WHICH IT HAS SINCE BACKED OFF, AT THE SURFACE FALLING MORE IN LINE WITH THE OTHER DETERMINISTIC AND ENSEMBLE MEAN GUIDANCE. THE VARIOUS GRIDS FOR ALASKA WERE BASED ON A COMPROMISE OF THE 00Z UKMET EARLY, 00Z CANADIAN, 00Z ECMWF, 06Z GFS, AND 12Z GFS, WITH SIGNIFICANT RELIANCE ON THE 00Z NAEFS/00Z ECMWF ENSEMBLE MEANS LATE IN PERIOD WITHIN THE PRESSURE/500 HPA/WIND GRIDS AND THROUGH THE PERIOD FOR TEMPERATURES, PRECIPITATION CHANCES, DEW POINTS, AND CLOUDS. CLOUDS AND PRECIPITATION SHOULD BE ON THE UPSWING FROM WEDNESDAY ONWARD -- MORE IN LINE WITH CLIMATOLOGY -- EAST OF THE UPPER TROUGH ACROSS SOUTHEAST AND EVENTUALLY SOUTHERN AK AS A PAIR OF CYCLONES, ONE WEAK EARLY ON AND THE OTHER SUBSTANTIALLY STRONGER NEXT WEEKEND, MOVE NEAR/TOWARDS SOUTH CENTRAL ALASKA AND KODIAK ISLAND. PRECIPITATION SLOWLY INCREASES IN INTENSITY, POTENTIALLY BECOMING HEAVY NEXT WEEKEND, WITH BOTH THE 00Z ECMWF AND 12Z GFS SHOWING GRID MAXIMA OF 4-5" OF LIQUID EQUIVALENT BETWEEN PRINCE WILLIAM SOUND AND THE PANHANDLE IN THE FEBRUARY 12-13 00Z 24 HOUR PERIOD, WHICH WOULD BE MOSTLY RAIN NEAR THE COAST AND SNOW INLAND AND WITHIN RUGGED TERRAIN. WESTERN AK APPEARS TO BE IN THE CLEAR THIS PERIOD NEAR AND WEST OF THE UPPER TROUGH. TEMPERATURES COOL OFF EARLY AS A COLD FRONT DROPS THROUGH THE LAST FRONTIER AND ATTEMPT TO REBOUND MILDER AS THE STRONGER LOW APPROACHES SOUTHERN AK NEXT SATURDAY AND SUNDAY. ROTH