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WGHW60 PHFO 050109
FFAHFO
FLOOD WATCH
NATIONAL WEATHER SERVICE HONOLULU HI
309 PM HST SUN JAN 4 2026
...FLOOD WATCH IN EFFECT THROUGH MONDAY AFTERNOON FOR ALL HAWAIIAN
ISLANDS...
HIZ001-003-004-006-007-009>011-015>018-022-023-026-027-029>054-
051530-
/O.CON.PHFO.FA.A.0001.000000T0000Z-260106T0400Z/
/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-
KONA-KOHALA-BIG ISLAND INTERIOR-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-
BIG ISLAND SOUTH-BIG ISLAND SOUTHEAST-BIG ISLAND EAST-BIG ISLAND
NORTH-
309 PM HST SUN JAN 4 2026
* WHAT...THE POSSIBILITY OF FLASH FLOODING CAUSED BY EXCESSIVE
RAINFALL.
* WHERE...ALL THE MAIN HAWAIIAN ISLANDS.
* WHEN...THROUGH MONDAY 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. SIGNIFICANT FLOODING MAY OCCUR DUE TO THE OVERFLOW
OF STREAMS AND DRAINAGES. LANDSLIDES MAY ALSO OCCUR IN AREAS WITH
STEEP TERRAIN.
* ADDITIONAL DETAILS...
- A KONA LOW NORTH OF KAUAI WILL MOVE GENERALLY SOUTH TODAY AND
MONDAY, REMAINING CLOSE TO THE WEST END OF THE STATE. IT WILL
THEN MOVE WEST AND WEAKEN WEDNESDAY INTO THURSDAY.
DEEP MOISTURE WITHIN AN INCREASINGLY UNSTABLE ENVIRONMENT
WILL REMAIN ACROSS ALL ISLANDS. EXPECT PERIODS OF MODERATE TO
LOCALLY HEAVY RAINFALL AND ISOLATED THUNDERSTORMS. FOR BIG
ISLAND AND MAUI COUNTY, THE GREATEST FLOOD RISK REMAINS ALONG
SOUTHEAST FACING MOUNTAIN SLOPES AS SOUTHERLY FLOW MORE
EFFICIENTLY LIFTS RICH MOISTURE UP THESE SLOPES.
LINGERING INSTABILITY OVER SOME ISLANDS MAY EXTEND THE TIMING
OF THIS FLOOD WATCH INTO TUESDAY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION
SHOULD FLASH FLOOD WARNINGS BE ISSUED.
SP
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