642 WWHW40 PHFO 290220 WSWHFO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE HONOLULU HI 420 PM HST WED NOV 28 2007 ...ACCUMULATING SNOW AT THE BIG ISLAND SUMMITS... .AN UPPER LEVEL TROUGH JUST NORTHWEST OF KAUAI WILL MOVE SOUTHEAST OF THE BIG ISLAND ON THURSDAY. CONVECTIVE SHOWERS AHEAD OF THIS SYSTEM WILL AFFECT THE BIG ISLAND THROUGH THURSDAY. COLD MID-LEVEL AIR ASSOCIATED WITH THE UPPER TROUGH HAS LOWERED THE FREEZING LEVEL AND HELPED TO REMOVE THE STABLE TEMPERATURE INVERSION... WHICH HAS ALLOWED SHOWERS TO REACH THE SUMMITS. TEMPERATURES WILL HOVER AROUND FREEZING TONIGHT...ALLOWING SCATTERED SNOW SHOWERS TO ACCUMULATE...WITH 2 TO 5 INCHES POSSIBLE. HIZ028-291530- /O.NEW.PHFO.WW.Y.0009.071129T0220Z-071129T2200Z/ BIG ISLAND SUMMITS- INCLUDING THE CITY OF...MAUNA LOA AND MAUNA KEA ABOVE 8000 FEET 420 PM HST WED NOV 28 2007 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 12 PM HST THURSDAY... THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A WINTER WEATHER ADVISORY...WHICH IS IN EFFECT UNTIL 12 PM HST THURSDAY. SNOW SHOWERS MAY BRING 2 TO 5 INCHES OF ACCUMULATION...MAINLY DURING TONIGHT. PRECIPITATION IS EXPECTED TO DIMINISH ON THURSDAY MORNING. A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. $$