061 WWHW70 PHFO 210148 NPWHFO URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE HONOLULU HI 348 PM HST MON FEB 20 2006 ...DENSE FOG OVER MAUNA KEA AND MAUNA LOA... .CLOUDS HUGGING THE SUMMITS OF THE BIG ISLAND ARE PERIODICALLY REDUCING VISIBILITY TO LESS THAN 1/4 OF A MILE ABOVE 9000 FEET. CONDITIONS ARE EXPECTED TO IMPROVE EARLY TUESDAY MORNING. HIZ028-211400- /O.EXT.PHFO.FG.Y.0002.000000T0000Z-060221T1400Z/ BIG ISLAND SUMMITS- 348 PM HST MON FEB 20 2006 ...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 4 AM HST TUESDAY... THE DENSE FOG ADVISORY IS NOW IN EFFECT UNTIL 4 AM HST TUESDAY. A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN... USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU. $$