AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
452 PM HST TUE APR 8 2008

.SYNOPSIS...
THE ATMOSPHERE HAS BECOME MOIST AND UNSTABLE BEHIND A NORTHWEST
MOVING TROUGH. CLOUD COVER WILL INCREASE AND SHOWERS WILL BECOME MORE
ACTIVE THROUGH FRIDAY. TRADE WINDS WILL RETURN FOR THE SECOND HALF OF
THE WEEK. TRADES ARE EXPECTED TO REMAIN INTO NEXT WEEK WITH THE POSSIBILITY
OF INCREASED SHOWERS OVER THE WEEKEND.

&&

.DISCUSSION...
GENERAL FLOW OUT OF THE SOUTHEAST HAS BROUGHT HAZE...OR VOG...EMANATING
FROM HALEMAUMAU AND PUU OO VENTS UP AND OVER THE ISLAND CHAIN. THE
HAZE CAN BE SEEN IN THE VISIBLE SATELLITE IMAGERY AND HAS REACHED
AS FAR AS OAHU THIS AFTERNOON. KAUAI CAN EXPECT THE HAZE TO REACH THE
ISLAND TONIGHT. HAZE WILL REMAIN OVER THE SMALLER ISLANDS THROUGH
WEDNESDAY AND FINALLY DISPERSE WEDNESDAY EVENING AS THE TRADE WINDS
REENTER THE STATE.

ON THE BIG ISLAND...WINDS AT THE SURFACE WILL BECOME LIGHT AND
VARIABLE TONIGHT. HOWEVER...JUST ABOVE THE SURFACE WINDS WILL
REMAIN OUT OF THE SOUTHEAST...BRINGING THE PLUME FROM THE VENTS
OVER THE SOUTHEAST RIFT AND INTO THE SOUTH HILO DISTRICT. CLOUDS
AND RAIN EXPECTED IN THE AREA TONIGHT SHOULD PROVIDE SOME RELIEF
BY MIXING PARTICULATES OUT OF THE ATMOSPHERE. THE PLUME AND
PARTICULATES FROM THE VOLCANO ARE EXPECTED TO SHIFT BACK OVER THE
KAU DISTRICT AS THE TRADE WINDS PICK UP LATE WEDNESDAY MORNING.

THE ATMOSPHERE HAS BECOME MORE UNSTABLE TODAY WITH AN UPPER LEVEL
LOW JUST NORTHWEST OF KAUAI AND THE SUBTROPICAL JET RUNNING UP
OVER THE ISLANDS. WE ALSO HAVE MOISTURE RIDING UP THE BACKSIDE OF
A NORTHWEST MOVING SURFACE TROUGH LOCATED NEAR KAUAI. THE MOISTURE
AND INSTABILITY PRODUCED SOME ISOLATED THUNDERSTORMS ON THE BIG
ISLAND THIS AFTERNOON AS WELL AS SOME HEAVY SHOWERS OVER THE NORTH
SHORE AND KOOLAU MTS OF OAHU. EXPECT SHOWER COVERAGE TO INCREASE
OVER THE WINDWARD BIG ISLAND THIS EVENING...AND THE CHANCE FOR HEAVY
SHOWERS INCREASES OVER THE SMALLER ISLANDS LATER TONIGHT AND
REMAINS THROUGH WEDNESDAY. ISOLATED THUNDERSTORMS ARE ALSO POSSIBLE
THIS EVENING OVER THE BIG ISLAND...AND THEN TOMORROW AFTERNOON
OVER THE SMALLER ISLANDS. THE SURFACE TROUGH CONTINUES MOVING
NORTHWEST OF THE ISLANDS WEDNESDAY NIGHT AS TRADE WINDS FILL IN TO
THE STATE. THE UPPER LOW REMAINS WEST OF THE ISLANDS AS IT WEAKENS
MAINTAINING THE THREAT OF ENHANCED SHOWERS THROUGH FRIDAY.

TRADES ARE EXPECTED TO REMAIN INTO NEXT WEEK WITH THE POSSIBILITY
OF INCREASED SHOWERS OVER THE WEEKEND.


&&

.HFO WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

$$

MORRISON