Satellite Interpretation Message
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ATHW40 PHFO 071226
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC TUE JUL 07 2015

BASED ON DATA THROUGH 1200 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 COUPLE OF DAYS. ALSO...A NEW SURFACE HIGH
NEAR 37N 167W...WHICH WAS MOVING TOWARD EAST NORTHEAST AT ABOUT 20
MPH...HAS ALSO HELPED TO INCREASE THE PRESSURE GRADIENT ACROSS THE
AREA EARLY THIS MORNING. THE LOW-LEVEL TRADE WIND FLOW HAS BEEN
TRANSPORTING SCATTERED TO BROKEN CUMULUS CLOUDS WITH EMBEDDED
SCATTERED SHOWERS TOWARD THE WINDWARD BIG ISLAND. THERE WERE ALSO
SCATTERED LOW CLOUDS AND ISOLATED SHOWERS BEING TRANSPORTED BY THE
TRADES INTO THE WINDWARD FACING SECTIONS OF SOME OF THE SMALLER
HAWAIIAN ISLANDS EARLY THIS MORNING. 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 TO 9 THOUSAND FEET.

AS OF 200 AM HST TUESDAY...SKIES WERE MOSTLY CLEAR OVER KAUAI.
BROKEN TO LOCALLY OVERCAST CLOUDS COVERED MOST OF THE WINDWARD
SHORES AND KOOLAU MOUNTAIN RANGE ON OAHU. THERE WERE SCATTERED TO
LOCALLY BROKEN LOW CLOUDS ELSEWHERE ON THAT ISLAND. BROKEN LOW
CLOUDS COVERED THE EASTERN TIP OF MOLOKAI. ON MAUI...SCATTERED LOW
CLOUDS WERE ALONG THE WINDWARD SHORES...LOWER WINDWARD SLOPES OF
MOUNT HALEAKALA AND THE WESTERN MOUNTAINS. BROKEN LOW CLOUDS WERE
MAINLY OVER THE EASTERN BIG ISLAND.

ACCORDING TO LOOPS OF WATER VAPOR IMAGERY...A NEARLY STATIONARY
MID-TROPOSPHERIC LOW WAS CENTERED NEAR 22N 151W...OR ABOUT 330 MILES
NORTHEAST OF HILO. A MID-TROPOSPHERIC TROUGH EXTENDED FROM THIS LOW
ACROSS THE BIG ISLAND. 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 AT LEAST THREE 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 1300 MILES EAST SOUTHEAST OF HILO.
SHOWERS AND THUNDERSTORMS ASSOCIATED WITH THIS SYSTEM HAVE CONTINUED
TO BECOME BETTER ORGANIZED...AND SATELLITE WIND DATA INDICATED THAT
THE SURFACE CIRCULATION HAS BECOME A LITTLE BETTER DEFINED OVERNIGHT
ACCORDING TO THE NATIONAL HURRICANE CENTER IN MIAMI...FLORIDA.
ENVIRONMENTAL CONDITIONS ARE EXPECTED TO BE CONDUCIVE FOR FURTHER
DEVELOPMENT...AND A TROPICAL CYCLONE WILL LIKELY FORM LATER TODAY OR
TONIGHT AS THIS SYSTEM MOVES TOWARD THE WEST NORTHWEST AT 15 TO 20
MPH.

SHOWERS AND THUNDERSTORMS PERSIST NEAR A WEAK...NEARLY STATIONARY
SURFACE LOW LOCATED ABOUT 750 MILES SOUTH SOUTHEAST OF HILO. THIS
SYSTEM REMAINED DISORGANIZED...AND ENVIRONMENTAL CONDITIONS DO NOT
APPEAR TO BE FAVORABLE FOR SIGNIFICANT DEVELOPMENT IN THIS AREA
DURING THE NEXT TWO DAYS. ELSEWHERE...SHOWERS AND THUNDERSTORMS
ASSOCIATED WITH A BROAD AREA OF LOW PRESSURE LOCATED ABOUT 1100
MILES SOUTH SOUTHWEST OF HONOLULU INCREASED IN COVERAGE...AND HAVE
BECOME SLIGHTLY BETTER ORGANIZED EARLY THIS MORNING. ENVIRONMENTAL
CONDITIONS APPEAR TO BE SOMEWHAT CONDUCIVE FOR SOME SLOW DEVELOPMENT
OF THIS SYSTEM AS IT MOVES SLOWLY TOWARD THE NORTH OR NORTHEAST OVER
THE NEXT COUPLE OF DAYS.

$$

HOUSTON






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