FNUS70 PHFO 141835
FWSHFO

SPOT FORECAST FOR PRESIDENTS DAY
NATIONAL WEATHER SERVICE HONOLULU HI
835 AM HST SAT MAR 14 2009

IF CONDITIONS BECOME UNREPRESENTATIVE...PLEASE CONTACT
THE NATIONAL WEATHER SERVICE.

.DISCUSSION...DEEP LAYERED LOW PRESSURE NORTH OF HAWAII IS PRODUCING
LIGHT LOW LEVEL SOUTHWEST FLOW. PRESSURE GRADIENTS REMAIN LIGHT IN THE
VICINITY OF THE BIG ISLAND ALLOWING FOR LIGHT AND VARIABLE WINDS THIS
MORNING...WHICH WILL GIVE WAY TO LIGHT SOUTHWEST WINDS AND OCCASIONAL
SEA BREEZE INFLUENCE LATE MORNING INTO THIS AFTERNOON. HIGH CONCENTRATIONS
OF VOG TRAPPED BY A NOCTURNAL INVERSION NEAR THE SURFACE THIS MORNING
SHOULD DECREASE AS DAYTIME MIXING BEGINS. THIS SCENARIO MAY REPEAT ITSELF
TOMORROW MORNING AS WELL. TONIGHT DRAINAGE WINDS ARE POSSIBLE GIVEN THE
WEAK LOCAL PRESSURE GRADIENTS. TRANSPORT FLOW WILL CONTINUE TO CARRY
ANY EMISSIONS IN A GENERAL NORTH DIRECTION.

.TODAY...
SKY/WEATHER.........PARTLY SUNNY. HAZE. SCATTERED SHOWERS.
MAX TEMPERATURE.....AROUND 63.
MIN HUMIDITY........55 PERCENT.
20-FOOT WINDS.......SOUTHWEST 8 TO 10 MPH.
MIXING HEIGHT.......3500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 20 MPH.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED SHOWERS.
MIN TEMPERATURE.....AROUND 48.
MAX HUMIDITY........90 PERCENT.
20-FOOT WINDS.......SOUTHWEST AROUND 7 MPH UNTIL LATE EVENING...THEN
                    NORTH AROUND 8 MPH.
MIXING HEIGHT.......3500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 20 MPH.

.SUNDAY...
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....AROUND 64.
MIN HUMIDITY........50 PERCENT.
20-FOOT WINDS.......LIGHT AND VARIABLE EARLY...THEN SOUTHWEST
                    AROUND 7 MPH.
MIXING HEIGHT.......3500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.


$$

FORECASTER...DEJESUS
REQUESTED BY...NPS
REASON FOR REQUEST...VOLCANIC EMISSIONS