FNUS70 PHFO 181649
FWSHFO

SPOT FORECAST FOR PRESIDENTS DAY
NATIONAL WEATHER SERVICE HONOLULU HI
649 AM HST MON JAN 18 2010

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

.DISCUSSION...
A LIGHT TO MODERATE TRADE WIND FLOW WILL PREVAIL INTO
TUESDAY OVER WATERS EAST AND SOUTH OF THE VOLCANO AREA...
WITH LIGHT NORTHEAST TRANSPORT WINDS NEAR HALEMAUMAU.
SURFACE WINDS AT THE VOLCANO WILL FAVOR A NORTH-NORTHEAST
DIRECTION FOR MOST OF THE DAY...EXCEPT FOR A FEW HOURS
IN THE AFTERNOON...WHEN WINDS ARE EXPECTED TO BE FROM
THE WEST-SOUTHWEST...AT SPEEDS NEAR 10 MPH. WINDS WILL
SHIFT TO THE NORTH TOWARDS EVENING...AND BECOME NORTH-NORTHWEST
OVERNIGHT. THE PATTERN IS EXPECTED TO REPEAT ON TUESDAY. A VERY
STABLE ATMOSPHERE WILL KEEP EMISSIONS TRAPPED BELOW 5000 FEET AT
ALL TIMES...WITH A NIGHTTIME STABLE LAYER NEAR THE GROUND TRAPPING
EMISSIONS VERY CLOSE TO THE GROUND THROUGH MID-MORNING. A MARKED
INCREASE IN NORTHEAST WINDS IS EXPECTED TUESDAY NIGHT THROUGH
THURSDAY...BUT LIGHTER SOUTHEAST WINDS ARE EXPECTED TO RETURN ON
FRIDAY. RAIN CHANCES OVER THE AREA ARE MINIMAL.


.TODAY...
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....AROUND 72.
MIN HUMIDITY........60 PERCENT.
WIND (20 FT)........NORTHEAST 8 TO 10 MPH.
MIXING HEIGHT.......3500 FT AGL.
TRANSPORT WINDS.....NORTHEAST AROUND 10 MPH.

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY.
MIN TEMPERATURE.....AROUND 50.
MAX HUMIDITY........100 PERCENT.
WIND (20 FT)........NORTH AROUND 9 MPH.
MIXING HEIGHT.......3500 FT AGL.
TRANSPORT WINDS.....NORTHEAST AROUND 10 MPH.

.TUESDAY...
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........60 PERCENT.
WIND (20 FT)........NORTHEAST AROUND 9 MPH.
MIXING HEIGHT.......3500 FT AGL.
TRANSPORT WINDS.....NORTHEAST AROUND 10 MPH.


FORECASTER...BIRCHARD

$$

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