Satellite Interpretation Message
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000
ATHW40 PHFO 290545
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC FRI JUL 29 2016

BASED ON DATA THROUGH 0500 UTC JULY 29 2016

THE VERY TIGHT PRESSURE GRADIENT SOUTH-SOUTHWEST OF A 1034 MB
SURFACE HIGH CENTERED NEAR 41N 143W...OR ALMOST 1600 MILES NORTH-
NORTHEAST OF HONOLULU...WAS MAINTAINING A GUSTY LOW-LEVEL TRADE
WIND FLOW ACROSS THE MAIN HAWAIIAN ISLAND CHAIN EARLY THIS
EVENING. THE TRADES WERE CARRYING SCATTERED TO BROKEN LOW
CLOUDS...PRIMARILY STRATOCUMULUS...ACROSS THE WINDWARD COASTAL
WATERS. THERE WERE ALSO BANDS OF SCATTERED TO LOCALLY BROKEN LOW
CLOUDS EXTENDING LEEWARD OF SOME OF THE ISLANDS. RADAR
REFLECTIVITY DATA INDICATED THERE WERE A FEW LIGHT SHOWERS
EMBEDDED WITHIN THE LOW CLOUDS NORTHEAST OF MOLOKAI AND EAST OF
THE BIG ISLAND.

THE INDIVIDUAL LOW CLOUD ELEMENTS WERE GENERALLY MOVING TOWARD THE
SOUTHWEST OR WEST-SOUTHWEST AT ABOUT 25 MPH. THE HIGHEST TOPS OF
THE LOW CLOUDS IN THE VICINITY OF THE ISLANDS WERE ESTIMATED TO BE
ABOUT 6 THOUSAND FEET.

AS OF 700 PM HST THURSDAY...BROKEN TO LOCALLY OVERCAST LOW CLOUDS
WERE ACROSS THE WINDWARD AND MAUKA AREAS OF KAUAI AND OAHU...WITH
SCATTERED LOW CLOUDS ELSEWHERE ON THOSE ISLANDS. BROKEN TO
OVERCAST LOW CLOUDS WERE OVER NORTHEASTERN MOLOKAI. A FEW LOW
CLOUDS WERE ABOVE LANAI AND ELSEWHERE ON MOLOKAI. ON MAUI...BROKEN
TO OVERCAST LOW CLOUDS WERE ALONG THE WINDWARD SHORELINES AND OVER
THE WESTERN MOUNTAINS. BROKEN TO LOCALLY OVERCAST LOW CLOUDS
COVERED PORTIONS OF THE LEEWARD COAT AND UPSLOPE REGION OF THE
KONA DISTRICTS ON THE BIG ISLAND. THERE WERE ALSO BROKEN LOW
CLOUDS ALONG THE LOWER ELEVATIONS OF THE WINDWARD BIG ISLAND.

ACCORDING TO LOOPS OF WATER VAPOR IMAGERY...MIDDLE TO UPPER
TROPOSPHERIC LOW WERE CENTERED NEAR 23N 145W...OR ABOUT 675 MILES
EAST-NORTHEAST OF HILO. THESE UPPER LEVEL FEATURES APPEARED TO BE
MOVING SLOWLY TOWARD THE WEST-NORTHWEST. ELSEWHERE...THE AXIS OF
AN UPPER TROPOSPHERIC TROUGH EXTENDED FROM NEAR 40N 173W TO 23N
178W...OR VERY CLOSE TO MIDWAY ATOLL. THERE HAS BEEN LITTLE
SIGNIFICANT MOVEMENT OF THIS UPPER LEVEL TROUGH DURING THE PAST
SEVERAL HOURS. OTHERWISE...AN AREA OF LIGHT WINDS ALOFT WAS ABOVE
THE MAIN HAWAIIAN ISLANDS. THIS APPEARED TO BE INDICATIVE OF AN
UPPER LEVEL COL. THERE WAS ALSO SOME SUBSIDENCE ALOFT OVER THE
REGION...WHICH WAS CONTRIBUTING TO THE STABLE ATMOSPHERIC
CONDITIONS IN THE VICINITY OF THE ALOHA STATE.

THE AXIS OF A SURFACE TROUGH EXTENDED FROM NEAR 29N 171W THROUGH
A POINT ABOUT 85 MILES SOUTHEAST OF MIDWAY ATOLL TO 24.5 180W.
THIS TROUGH...WHICH WAS ASSOCIATED WITH THE REMNANTS OF FORMER
TROPICAL CYCLONE DARBY...HAS BEEN MOVING SLOWLY WESTWARD.
ISOLATED THUNDERSTORMS WERE WITHIN 90 MILES SOUTHEAST OF THIS
FEATURE...AS WELL AS TO THE NORTHWEST OF THE TROUGH SOUTH OF
27.5N. THE HIGHEST TOPS OF THE THUNDERSTORMS IN THE VICINITY OF
THIS TROUGH WERE ESTIMATED TO BE ABOUT 34 THOUSAND FEET.

IN THE DEEP TROPICS FAR SOUTH OF THE HAWAIIAN ISLANDS...THE
INTERTROPICAL CONVERGENCE ZONE...OR ITCZ...EXTENDED FROM NEAR 09N
140W TO 12N 156W TO 08N 180E. ISOLATED MODERATE TSTMS WERE WITHIN
200 MILES OF THE ITCZ WEST OF 150W...WHILE A FEW THUNDERSTORMS
WERE WITHIN 80 MILES OF THE ITCZ EAST OF 150W. THE HIGHEST TOPS OF
THE THUNDERSTORMS ALONG THE ITCZ WERE ESTIMATED TO BE ABOUT 50
THOUSAND FEET.

$$

HOUSTON


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