Satellite Interpretation Message
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000
ATHW40 PHFO 181830
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1830 UTC FRI APR 18 2014

BASED ON DATA THROUGH 1800 UTC APRIL 18 2014

WATER VAPOR IMAGERY SHOWED AN UPPER LEVEL TROUGH SITTING SOUTHWEST
OF THE STATE THIS MORNING.  THE TROUGH AXIS STRETCHED FROM 20N 163W
TO 15N 165W TO 09N 170W.  THE TROUGH WAS NEARLY STATIONARY.  THERE
WAS A HINT THAT AN UPPER LOW WAS TRYING TO FORM NEAR 17N 164W BUT
IT WAS NOT QUIET HAPPENING YET.

THE SOUTHERLY WINDS ON THE EAST SIDE OF THIS UPPER TROUGH WAS
DRAWING A SWATH OF CIRRUS CLOUDS UP FROM THE DEEPER TROPICS TOWARD
THE ISLANDS.  THE CIRRUS WAS MOSTLY BETWEEN 158W AND 164W FROM 10N
TO 20N.  THE CIRRUS NEAR 10N WAS OVERCAST IN COVERAGE...AND BECAME
SCATTERED TO BROKEN AT 20N.  SCATTERED TO BROKEN FRAGMENTS OF CIRRUS
WERE THEN VEERING TOWARD THE EAST ACROSS THE ISLANDS AND CONTINUING
TO 142W BETWEEN 18N AND 22N.

A LARGE STREAM OF CIRRUS WAS ALSO LOCATED FAR NORTH OF THE ISLANDS.
THIS WEST SOUTHWEST TO EAST NORTHEAST ALIGNED STREAM WAS ROUGHLY 300
MILES WIDE.  THE SOUTH EDGE OF THE CIRRUS EXTENDED FROM 24N 180E TO
35N 140W.  THE CIRRUS WAS FLOWING OVER A FRONTAL SYSTEM DIRECTLY
BENEATH IT.

MEANWHILE...AT THE LOWER LEVELS OF THE ATMOSPHERE...PERSISTENT TRADE
WINDS CONTINUED TO SWEEP RANDOM PATCHES AND CLUSTERS OF LOW CLOUDS
INTO THE HAWAIIAN ISLANDS.  NEAR THE ISLANDS...THE LOW CLOUDS WERE
MOVING WEST NEAR 25 MILES AN HOUR.

THE MIX OF LOW CLOUDS AND HIGH LEVEL CIRRUS CLOUDS WAS MAKING SKIES
MOSTLY CLOUDY TO CLOUDY OVER MOST OF THE STATE.  THE SUNNIEST
SKIES...AT 8 AM...WERE SEEN OVER MAUI.  HOWEVER...THERE WERE SOME
CLOUDY AREAS OVER EAST MAUI AND OVER THE WEST MAUI MOUNTAINS.

$$




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