997
WGHW60 PHFO 180340
FFAHFO

Flood Watch
National Weather Service Honolulu HI
540 PM HST Thu Sep 17 2026

.Remnant moisture from former Tropical Storm Norbert will bring
periods of moderate to heavy showers to mainly windward sides of the
Hawaiian Islands through late tonight.

HIZ015>018-022-023-026>028-037>054-181600-
/O.CON.PHFO.FA.A.0012.000000T0000Z-260918T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lanai Mauka-Kahoolawe-Maui Windward West-Maui Leeward West-
Haleakala Summit-Kona-Kohala-Big Island Interior-Big Island
Summit-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-
540 PM HST Thu Sep 17 2026

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Maui, Lanai, Molokai, The Big Island and Kahoolawe.

* WHEN...Through late tonight.

* 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...
  - A band of remnant moisture from Norbert will move west across the
    islands through Friday, bringing moderate to locally heavy
    showers and isolated thunderstorms to mainly windward sides of
    the islands. Thunderstorms could produce briefly higher rain
    rates, increasing the risk of flash flooding.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

HIZ001-003-004-006-007-009>011-029>036-181600-
/O.CON.PHFO.FA.A.0012.000000T0000Z-260918T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Niihau-Kauai Southwest-Kauai Mountains-Waianae Coast-Oahu North
Shore-Olomana-Central Oahu-Waianae Mountains-Kauai North-Kauai
East-Kauai South-East Honolulu-Honolulu Metro-Ewa Plain-Koolau
Windward-Koolau Leeward-
540 PM HST Thu Sep 17 2026

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Kauai, Niihau and Oahu.

* WHEN...Through late tonight.

* 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...
  - A band of remnant moisture from Norbert will move west across the
    islands through Friday, bringing moderate to locally heavy
    showers to mainly windward sides of the islands. There is a
    slight chance of thunderstorms as well, which could produce
    briefly higher rain rates, increasing the risk of flash flooding.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

SS