175 WWHW40 PHFO 251347 WSWHFO URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE HONOLULU HI 347 AM HST TUE DEC 25 2007 ...WINTER WEATHER ADVISORY EXTENDED FOR BIG ISLAND SUMMITS... .ANOTHER ROUND OF CONVECTIVE SHOWERS WILL AFFECT THE BIG ISLAND TODAY. THE AIRMASS IS UNSTABLE AND THE FREEZING LEVEL REMAINS LOW ENOUGH FOR SNOW TO ACCUMULATE ON THE MAUNA KEA AND MAUNA LOA SUMMITS. PARK RANGERS REPORT THAT SUMMIT ROADS ARE CLOSED TO THE PUBLIC. POSTPONE TRAVEL TO THE SUMMITS UNTIL CONDITIONS IMPROVE. HIZ028-260300- /O.EXT.PHFO.WW.Y.0011.000000T0000Z-071226T0400Z/ BIG ISLAND SUMMITS- INCLUDING THE CITY OF...MAUNA LOA AND MAUNA KEA ABOVE 8000 FEET 347 AM HST TUE DEC 25 2007 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 PM HST THIS AFTERNOON... SCATTERED SNOW SHOWERS WILL BRING 1 TO 3 INCHES OF ADDITIONAL ACCUMULATION TO THE BIG ISLAND SUMMITS TODAY. A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...AND/OR ICY ROADWAYS WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. $$ BRAVENDER