141 
ATHW40 PHFO 190320 AAA
SIMHI 

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE...UPDATED
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0320 UTC MON AUG 19 2013

BASED ON DATA THROUGH 0000 UTC AUGUST 19 2013

THE LARGEST FEATURE NOTED IN SATELLITE LOOP IS A BROAD ANTICYCLONIC 
CIRCULATION SPANNING THE CENTRAL AND EASTERN PACIFIC SOUTH OF 40N. 
THIS CIRCULATION...ACTUALLY A SUBTROPICAL RIDGE...HAS AN EAST TO 
WEST AXIS ALONG ABOUT 35N. LOW LEVEL FLOW SOUTH OF THE RIDGE AXIS IS 
GENERALLY FROM EAST TO WEST...INCLUDING ACROSS THE MAIN HAWAIIAN 
ISLANDS AND LOCAL WATERS. A RAGGED 300 MILE WIDE BAND OF OVERCAST 
LAYERED CLOUDS NORTH OF A LINE FROM 44N140W TO 40N160W TO 38N170W TO 
40N180W MARKS A FRONTAL BOUNDARY ALONG THE NORTHERN FLANK OF THE 
RIDGE. THIS BAND HAS BEEN DRIFTING SOUTH SLOWLY ALONG THAT PORTION 
BETWEEN 160W AND 180W. 

WATER VAPOR LOOP SHOWS A WEAK UPPER LOW NEAR 30N169W. THIS FEATURE 
IS MARKED BY SMALL PATCHES OF CUMULONIMBUS...CB...ALONG ITS 
SOUTHEAST FLANK...MAINLY FROM 28N TO 30N BETWEEN 164W AND 167W. 
OTHER ASSOCIATED CB FARTHER TO THE WEST HAVE DISSIPATED SINCE THIS 
MORNING.

AN AREA OF PATCHY BROKEN LOW CLOUDS LIES ACROSS MAUI COUNTY WINDWARD 
WATERS THIS AFTERNOON...AFFECTING WINDWARD AND MAUKA SECTIONS OF 
THOSE ISLANDS. A SMALLER AREA OF BROKEN LOW CLOUDS IS MOVING 
WESTWARD JUST SOUTH OF THE BIG ISLAND. OTHERWISE...LOCAL WATERS HAVE 
SCATTERED LOW CLOUDS TO CLEAR SKIES. KAUAI HAS SCATTERED LOW CLOUDS 
ACROSS ITS EASTERN HALF...WHILE OAHU HAS BROKEN LOW CLOUDS ACROSS 
THE KOOLAU SUMMITS. ALMOST ALL AREAS OF LANAI HAVE BROKEN LOW 
CLOUDS. MOLOKAI HAS BROKEN LOW CLOUDS ACROSS ITS EASTERN 
THIRD...WHILE MAUI HAS BROKEN TO OVERCAST LOW CLOUDS ACROSS ALL 
SLOPES...LEAVING ONLY IMMEDIATE SHORELINES AND THE SADDLE WITH 
SCATTERED LOW CLOUDS TO CLEAR SKIES. OVERCAST LOW CLOUDS COVER KONA 
SHORES AND SLOPES OF THE BIG ISLAND FROM SOUTH POINT TO KAILUA-KONA. 
KAU SLOPES ARE SIMILARLY COVERED. IN CONTRAST...WINDWARD BIG ISLAND 
SHORES AND SLOPES HAVE SCATTERED LOW CLOUDS TO CLEAR SKIES. 
SATELLITE LOOP SHOWS LOW CLOUDS MOVING ACROSS THE AREA TOWARDS THE 
WEST AT 20 TO 25 MPH.

THE CENTRAL PACIFIC HURRICANE CENTER...CPHC...IS ISSUING ADVISORIES 
ON TROPICAL STORM UNALA...LOCATED 1275 MILES WEST SOUTHWEST OF LIHUE 
KAUAI...UNDER AWIPS HEADER TCMCP5 AND WMO HEADER WTPA25 PHFO. AN 
AREA OF SCATTERED CB FROM 15N TO 19N BETWEEN 167W AND 172W MARKS A 
SURFACE TROUGH OF INTEREST TO CPHC. A 90 TO 120 MILE WIDE BAND OF CB 
SOUTH OF A LINE FROM 14N140W TO 12N150W TO 10N158W MARKS THE 
INTERTROPICAL CONVERGENCE ZONE. 

$$

POWELL