Satellite Interpretation Message
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000
ATHW40 PHFO 141233
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC SUN FEB 14 2016

BASED ON DATA THROUGH 1200 UTC FEBRUARY 14 2016

AS WAS THE CASE EARLIER IN THE NIGHT...THE EASTERN HALF OF THE
TROPICAL CENTRAL NORTH PACIFIC...FROM 10N TO 30N BETWEEN 140W AND
160W...IS DOMINATED BY FEW TO SCATTERED STABLE SHALLOW LOW
CLOUDS...STRATOCUMULUS /SC/ AND CUMULUS /CU/...THAT ARE TRACKING
GENERALLY WESTWARD WITHIN A STURDY TRADE WIND FLOW. HOWEVER...NEAR
AND NORTH OF THE MAIN HAWAIIAN ISLANDS...NORTH OF 20N BETWEEN
153W AND 160W...THE LOW CLOUDS ARE TURNING TOWARD THE NORTH.
BETWEEN 160W AND THE INTERNATIONAL DATE LINE ALONG 180...A NEARLY
300 MILE WIDE NORTHEAST TO SOUTHWEST ORIENTED BAND OF OVERCAST
LAYERED CLOUDS INTERSECTS THE AREA. NORTHWEST OF THIS BOUNDARY...
BROKEN TO OVERCAST COLD-AIR CU AND TOWERING CU ARE SEEN STREAMING
SOUTHEASTWARD.

LOW CLOUDS OVER AND NEAR THE MAIN HAWAIIAN ISLANDS REMAIN
RELATIVELY SPARSE IN COVERAGE...BUT AREAS OF BROKEN LOW CLOUDS
HAVE DEVELOPED OVERNIGHT WITHIN A CLOUD FIELD DOMINATED BY
SCATTERED SC AND CU. THE LOW-LEVEL FLOW NEAR AND SOUTH OF THE BIG
ISLAND CONTINUES TO MOVE FROM EAST TO WEST...WITH SC AND CU CLOUDS
MOVING AT SPEEDS NEAR 30 MPH. LOW CLOUDS NEAR KAUAI ARE MOVING
MORE SLOWLY TOWARD THE WEST-NORTHWEST...AT SPEEDS NEAR 15 MPH.

THE OVERCAST CLOUD BAND NORTHWEST OF THE MAIN HAWAIIAN ISLANDS
MARKS A SURFACE FRONT THAT IS CENTERED ALONG A LINE FROM 30N163W
TO 25N169W TO 20N176W. LOW-LEVEL CONVERGENCE AHEAD OF THE FRONT
IS LEADING TO INCREASED CLOUDINESS BETWEEN KAUAI AND THE FRONT...
WITH BROKEN TO OVERCAST LOW- AND MID-LEVEL CLOUDS LOCATED ALONG A
200 MILE WIDE LINE CENTERED ALONG 30N158W TO 22N167W TO 19N170W.

LOW CLOUDS NEAR THE ISLANDS ARE PREDOMINANTLY SCATTERED IN
COVERAGE AND ARE VERY SHALLOW AND STABLE...NOT LIKELY ABLE TO DROP
ANY SIGNIFICANT RAINFALL. WATER VAPOR IMAGERY SHOWS WHY THE
EASTERN PORTION OF THE TROPICAL CENTRAL NORTH PACIFIC LACKS
ANYTHING BESIDE SHALLOW STABLE LOW CLOUDS...AS A STRONG AND
RELATIVELY SHARP NORTHEAST TO SOUTHWEST ORIENTED RIDGE ALOFT
PREVAILS OVER THE AREA...PROVIDING STRONG LARGE-SCALE SINKING
MOTION OVER THE REGION.

$$

BIRCHARD


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