937
WGHW60 PHFO 151135
FFAHFO
URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE HONOLULU HI
135 AM HST FRI MAY 15 2026
...FLOOD WATCH IN EFFECT THROUGH THIS AFTERNOON FOR MOST HAWAIIAN
ISLANDS...
HIZ001-003-004-006-007-009>011-015>018-022-029>050-160400-
/O.NEW.PHFO.FA.A.0008.260515T1135Z-260516T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NIIHAU-KAUAI SOUTHWEST-KAUAI MOUNTAINS-WAIANAE COAST-OAHU NORTH
SHORE-OLOMANA-CENTRAL OAHU-WAIANAE MOUNTAINS-LANAI MAUKA-
KAHOOLAWE-MAUI WINDWARD WEST-MAUI LEEWARD WEST-HALEAKALA SUMMIT-
KAUAI NORTH-KAUAI EAST-KAUAI SOUTH-EAST HONOLULU-HONOLULU METRO-
EWA PLAIN-KOOLAU WINDWARD-KOOLAU LEEWARD-MOLOKAI WINDWARD-MOLOKAI
SOUTHEAST-MOLOKAI NORTH-MOLOKAI WEST-MOLOKAI LEEWARD SOUTH-LANAI
WINDWARD-LANAI LEEWARD-LANAI SOUTH-MAUI CENTRAL VALLEY NORTH-MAUI
CENTRAL VALLEY SOUTH-WINDWARD HALEAKALA-KIPAHULU-SOUTH
MAUI/UPCOUNTRY-SOUTH HALEAKALA-
135 AM HST FRI MAY 15 2026
* WHAT...FLASH FLOODING CAUSED BY EXCESSIVE RAINFALL IS POSSIBLE.
* WHERE...NIIHAU, KAUAI, OAHU, MOLOKAI, LANAI, KAHOOLAWE, AND MAUI.
* WHEN...THROUGH THIS AFTERNOON.
* IMPACTS...FLOOD PRONE ROADS AND OTHER LOW LYING AREAS MAY BE
CLOSED DUE TO ELEVATED RUNOFF AND OVERFLOWING STREAMS. URBAN AREAS
MAY RECEIVE MORE SIGNIFICANT FLOODING AND PROPERTY DAMAGE DUE TO
RAPID RUNOFF.
* ADDITIONAL DETAILS...
- AN UNSEASONABLY COLD UPPER LEVEL LOW MOVING INTO THE HAWAIIAN
ISLANDS FROM THE NORTH WILL PRODUCE PERIODS OF HEAVY SHOWERS
ACROSS THE ISLAND CHAIN TODAY. THE CENTER OF THE LOW WILL
SETTLE IN OVER KAUAI AROUND NOON HST, THE LOW WILL THEN
WEAKEN AND DRIFT SLOWLY EASTWARD TONIGHT. UNSTABLE CONDITIONS
WITHIN THIS UPPER LOW WILL LIKELY PRODUCE PERIODS OF
THUNDERSTORMS AND HEAVY SHOWERS, POTENTIALLY LEADING TO FLASH
FLOODING CONDITIONS IN SOME AREAS. THIS FLOOD WATCH MAY NEED
TO BE EXTENDED INTO THE OVERNIGHT HOURS FOR SOME COUNTIES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION
SHOULD FLASH FLOOD WARNINGS BE ISSUED.
RCB
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