Satellite Interpretation Message
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000
ATHW40 PHFO 070611 RRA
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0600 UTC TUE JUL 07 2015

BASED ON DATA THROUGH 0530 UTC JULY 07 2015

THE TIGHTENING PRESSURE GRADIENT SOUTH OF THE SOUTHERN END OF A
SURFACE RIDGE HAS CAUSED THE LOW-LEVEL TRADE WIND FLOW TO GRADUALLY
INCREASE DURING THE PAST 24 HOURS. THIS LOW-LEVEL FLOW HAS BEEN
TRANSPORTING SCATTERED CUMULUS CLOUDS WITH EMBEDDED ISOLATED SHOWERS
TOWARD THE MAIN HAWAIIAN ISLAND CHAIN. THE INDIVIDUAL LOW CLOUD
ELEMENTS OVER THE WINDWARD HAWAIIAN COASTAL WATERS WERE GENERALLY
MOVING TOWARD THE SOUTH SOUTHWEST AT ABOUT 20 MPH. THE HIGHEST TOPS
OF THE LOW CLOUDS WERE ESTIMATED TO BE 8 THOUSAND FEET.

AS OF 700 PM HST...BROKEN LOW CLOUDS COVERED MOST OF THE
NORTHEASTERN HALF OF KAUAI...WHILE SCATTERED LOW CLOUDS WERE
ELSEWHERE ON THAT ISLAND. BROKEN TO LOCALLY OVERCAST LOW CLOUDS WERE
ALONG THE KOOLAU MOUNTAIN RANGE...WITH SCATTERED TO BROKEN LOW
CLOUDS ACROSS MOST OF THE REST OF OAHU. SCATTERED TO BROKEN LOW
CLOUDS COVERED MOST OF THE EASTERN TIP OF MOLOKAI. SKIES APPEARED TO
BE MOSTLY CLEAR ON LANAI AND THE REMAINDER OF MOLOKAI. ON MAUI...
BROKEN LOW CLOUDS WERE ALONG THE WINDWARD COAST AND LOWER WINDWARD
SLOPES OF MOUNT HALEAKALA...AS WELL AS OVER PARTS OF THE WESTERN
MOUNTAINS. BROKEN TO LOCALLY OVERCAST LOW CLOUDS COVERED PORTIONS
OF THE SOUTHERN AND SOUTHWESTERN UPSLOPE AND COASTAL AREAS OF THE
BIG ISLAND...AS WELL AS MOST OF THE LOWER ELEVATIONS OF THE WINDWARD
BIG ISLAND.

ACCORDING TO LOOPS OF WATER VAPOR IMAGERY...A NEARLY STATIONARY
MID-TROPOSPHERIC LOW WAS CENTERED NEAR 22.5N 151W...OR ABOUT 320
MILES NORTHEAST OF HILO. A MID-TROPOSPHERIC TROUGH EXTENDED FROM
THIS LOW TO A POINT ABOUT 180 MILES EAST SOUTHEAST OF SOUTH POINT.
AS A RESULT...MID-TROPOSPHERIC WINDS ACROSS THE MAIN HAWAIIAN
ISLANDS WERE FROM THE NORTH AND NORTH NORTHEAST AT 10 TO 20 MPH.

THERE WERE A NUMBER OF SYSTEMS OF INTEREST IN THE DEEP TROPICS SOUTH
SOUTHWEST THROUGH SOUTHEAST OF THE MAIN HAWAIIAN ISLANDS. OF MOST
INTEREST TO THE ISLANDS OVER THE NEXT FEW DAYS WAS A LARGE AREA OF
LOW PRESSURE LOCATED ABOUT 1350 MILES EAST SOUTHEAST OF HILO.
SHOWERS AND THUNDERSTORMS ASSOCIATED WITH THIS SYSTEM CONTINUED TO
GRADUALLY BECOME BETTER ORGANIZED. HOWEVER...SATELLITE DATA
SUGGESTED THAT THE LOW DOES NOT HAVE A WELL-DEFINED LOW-LEVEL CENTER
AT THIS TIME. ENVIRONMENTAL CONDITIONS ARE EXPECTED TO REMAIN
CONDUCIVE FOR CONTINUED DEVELOPMENT...AND A TROPICAL CYCLONE WILL
LIKELY FORM DURING THE NEXT DAY OR TWO AS THIS SYSTEM MOVES TOWARD
THE WEST NORTHWEST AT 15 TO 20 MPH.

PERSISTENT SHOWERS AND THUNDERSTORMS NEAR A WEAK...NEARLY STATIONARY
SURFACE LOW WERE LOCATED ABOUT 775 MILES SOUTH SOUTHEAST OF HILO.
THIS SYSTEM REMAINS DISORGANIZED THIS EVENING...AND ENVIRONMENTAL
CONDITIONS DO NOT APPEAR TO BE FAVORABLE FOR SIGNIFICANT DEVELOPMENT
IN THIS AREA DURING THE NEXT TWO DAYS. SHOWERS AND THUNDERSTORMS
ASSOCIATED WITH A BROAD AREA OF LOW PRESSURE LOCATED ABOUT 1100
MILES SOUTH SOUTHWEST OF HONOLULU HAVE BECOME SLIGHTLY BETTER
ORGANIZED THIS EVENING. ENVIRONMENTAL CONDITIONS APPEAR TO BE
CONDUCIVE FOR SOME SLOW DEVELOPMENT OF THIS NEARLY STATIONARY SYSTEM
THROUGH EARLY WEDNESDAY EVENING.

$$

HOUSTON




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