AN EXTREMELY MOIST AND UNSTABLE ATMOSPHERE OVER THE ISLANDS WILL SUPPORT THE DEVELOPMENT OF SLOW-MOVING HEAVY DOWNPOURS THAT COULD LEAD TO FLASH FLOODING.THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A FLASH FLOOD WATCH FOR ALL HAWAIIAN ISLANDS UNTIL 6 AM HST WEDNESDAY.
* ABUNDANT MOISTURE OVER THE ISLANDS WILL COMBINE WITH A NEARBY
LOW ALOFT TO PRODUCE EXTREMELY HEAVY SHOWERS THAT ARE EXPECTED
TO BE SLOW-MOVING. THE THREAT OF HEAVY RAIN WILL CONTINUE INTO
TONIGHT.
* EXCESSIVE RUNOFF COULD PRODUCE FLOODING THAT LEADS TO FLASH
FLOODING…EVEN IN AREAS WHERE HEAVY RAIN IS NOT OCCURRING. LAND
SLIDES ARE POSSIBLE IN AREAS OF STEEP TERRAIN. HEAVY SHOWERS
WILL BE CAPABLE OF DROPPING 2 TO 3 INCHES OF RAIN IN A VERY
SHORT PERIOD OF TIME.