Satellite Interpretation Message
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000
ATHW40 PHFO 281246
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC TUE JUL 28 2015

BASED ON DATA THROUGH 1200 UTC JULY 28 2015

SHOWER ACTIVITY HAS INCREASED OVER PARTS OF THE ISLAND CHAIN DURING
THE PAST FEW HOURS...MOST NOTABLY OVER AND IN VICINITY OF OAHU AND
OVER EASTERN BIG ISLAND. THE SHOWERS THAT ARE PASSING THROUGH OAHU
NOW CAME FROM AN AREA OF CLOUDINESS SITUATED OVER THE WINDWARD
WATERS OF MAUI AND MOLOKAI AT SUNSET. PRIMARILY THE KOOLAU MOUNTAINS
AND THE ADJACENT WINDWARD DISTRICTS ARE AFFECTED...AND FROM TIME TO
TIME...A SHOWER WILL STRAY DOWNWIND INTO THE LEEWARD COMMUNITIES.
THE LAST OF THE SHOWERS WITH THIS AREA IS ABOUT TO LEAVE OAHU AND
BEGIN THREATENING KAUAI. KAUAI HAS BEEN MOSTLY DRY UP TO NOW WITH
SCATTERED TO LOCALLY BROKEN LOW CLOUDS. NARROW BAND OF SHOWERS HAS
FORMED WHILE ON ITS APPROACH TO THE EAST FACING SHORELINE OF THE BIG
ISLAND. THIS BAND IS ABOUT TO MOVE ASHORE. AS OF 2 AM HST...IT IS
MAINLY FAIR AND DRY ACROSS MAUI COUNTY AND THE HAMAKUA SIDE OF THE
BIG ISLAND. THERE ARE STILL SOME LINGERING SCATTERED TO BROKEN LOW
CLOUDS STRETCHED ACROSS THE LEEWARD SIDE OF THE BIG ISLAND.
SCATTERED LOW CLOUDS EXTENDED FOR 600 MILES EAST OF THE BIG ISLAND
AND MAUI BEFORE THERE ARE ANY SIGNIFICANT AMOUNTS.

THE GENERAL LOW LEVEL WIND FLOW IN VICINITY AND OVER THE ISLANDS IS
FROM EAST TO WEST WITH A SLIGHT SOUTH COMPONENT OVER THE WESTERN
HALF OF THE ISLAND CHAIN. THE SPEED IS CLOCKED AT 15 TO 20 MPH.

OUTSIDE OF THE MAIN HAWAIIAN ISLANDS...A FIELD OF SCATTERED
CUMULONIMBUS CLOUDS /CB/ AND TOWERING CUMULUS /TCU/ LIES NORTHWEST
TO NORTH OF THE ISLANDS BETWEEN 30N AND 25N FROM 156W TO 180W. THE
HIGHEST CB TOP IS 44000 FEET. THE LIKELY CAUSE FOR THESE CUMULUS
BASED CLOUDS IS AN UPPER LEVEL LOW OR A SHORTWAVE TROUGH LOCATED 735
MILES WEST OF KAUAI AT COORDINATES 23N171W. THIS FEATURE IS MOVING
EAST AT 10 TO 15 MPH. THE SHORTWAVE TROUGH EXTENDED NORTHEASTWARD TO
30N163W. WATER VAPOR IMAGERY SHOWS A 250 MILE WIDE BAND OF THIN
CIRRUS GRAZING BOTH KAUAI AND OAHU...OR 125 MILES EITHER SIDE OF A
LINE FROM 20N180W TO 20N171W TO 25N155W.

INFRARED SATELLITE IMAGERY SHOWS SEVERAL LOW LEVEL TROUGHS OVER
THE OPEN WATERS IN THE CENTRAL NORTH PACIFIC. FIRST TROUGH IS
LOCATED 710 MILES EAST OF THE BIG ISLAND WITH THE COORDINATES OF
30N145W TO 19N143W MOVING WEST AT 12 MPH. THIS TROUGH HAS BECOME
MORE EVIDENT IN THE PAST FEW HOURS. THE SECOND TROUGH IS CLOSER TO
THE ISLANDS...ABOUT 400 MILES EAST OF MAUI WITH THE COORDINATES OF
25N150W TO 20N150W. THIRD TROUGH IS PLACED 350 MILES SOUTH OF THE
BIG ISLAND FROM 14N155W TO 06N153W. THE TROUGH IS SURROUNDED BY
SCATTERED CONVECTION ABOUT 100 MILES WEST AND 150 MILES EAST OF THE
TROUGH. SOME OF THIS CONVECTION HAS SPILLED INTO OUR OFFSHORE
WATERS. LASTLY...THE FOURTH TROUGH IS LOCATED 380 MILES WEST OF
KAUAI WITH THE COORDINATES OF 27N165W TO 20N166W...AND IS MOVING
WEST AT 12 MPH.

IN THE TROPICS SOUTH OF THE ISLANDS...A CLUSTER OF MODERATE
INTENSITY CB/S IS LOCATED BETWEEN 14N AND 08N EAST OF 147W. HIGHEST
CB TOP IS 53000 FEET.

$$

LAU







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