Flood Watch

NWS Honolulu HI · US

Updated

Details

Flood Watch Remains In Effect Through Saturday Afternoon

Event: Flood Watch
Issued: 2026-09-25 14:35:00 UTC
Onset: 2026-09-25 14:35:00 UTC
Message expires: 2026-09-26 04:45:00 UTC
Expected end: 2026-09-27 04:00:00 UTC
Category: Meteorological
Urgency: Future
Severity: Severe
Certainty: Possible
Response: Prepare

Description

Overview

Hurricane Nolo is expected to bring heavy showers to the eastern end of the state over the next few days. The exact track of the dangerous tropical cyclone remains somewhat uncertain, but significant heavy rain is likely over windward and southeast Big Island.

What

Flash flooding caused by excessive rainfall is possible.

Where

Big Island, Maui, Lanai, Molokai, and Kahoolawe.

When

Through Saturday afternoon.

Impacts

Significant flooding may occur due to the overflow of streams and drainages. Roads in several areas may be closed, along with property damage in urban or low lying spots due to runoff. Landslides may also occur in areas with steep terrain.

Additional details

- Deep moisture on the north side of Hurricane Nolo will bring heavy showers to the Big Island, and to a lesser extend to Maui through the Saturday. Windward and southeast Big Island, and windward Maui, are the most likely to experience heavy rain due to the slow moving system, with considerable flooding possible over the remaining portions of Big Island and Maui today and Saturday. The remainder of Maui County has a lower possibility of flooding, but remains at risk.

Instructions

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

Affected areas

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

Public contact

Issuer: NWS Honolulu HI
Website: http://www.weather.gov

Message record

Received: 2026-09-25 14:36:00 UTC
Issue to receipt: ~1m1s
CAP status: Actual
CAP message type: Update
Lifecycle: Updated
Source: NWWS-OI
Feed: NWWS
Recovered: No

CAP routing and identity

ULID: 01M3CFX7QG4ANNFMVN10J86478
Identifier: urn:oid:2.49.0.1.840.0.63236fa3a4fb72ab342348c93af571cd44836a0c.001.1
Sender: w-nws.webmaster@noaa.gov
Scope: Public
CAP source: 211803 v2.3.0
Handling codes: IPAWSv1.0
Issuing office: NWS Honolulu HI
AWIPS ID: CAPHFO
NWWS sequence: nwws_processor.3677
WMO heading: XOHW50
WMO data type: CAP alert message XML (XO)
WMO geography: Hawaiian Islands (HW)
WMO bulletin number: 50

References

Identifier: urn:oid:2.49.0.1.840.0.cb1399e1cc8e8553e0387819fafb629a00062f5b.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-25 01:45:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.20a785c891f972e0073d00bbea65c5d10779d95f.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-25 02:51:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.0be23b1680d7f4f271507185e74b730f908185fa.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-24 14:48:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.27c93ef1b29bda3e04166629795fe71aa61e2ea6.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-23 13:44:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.59599f54f3e9e47644ed14ad1fd6294e24114766.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-23 00:48:00 UTC

Event codes

Name	Value
SAME	FFA
NationalWeatherService	FAA

Parameters

Name	Value
AWIPSidentifier	FFAHFO
WMOidentifier	WGHW60 PHFO 251435
NWSheadline	FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
BLOCKCHANNEL	EAS
BLOCKCHANNEL	NWEM
EAS-ORG	WXR
VTEC	/O.CON.PHFO.FA.A.0013.000000T0000Z-260927T0400Z/
eventEndingTime	2026-09-26T18:00:00-10:00
BLOCKCHANNEL	CMAS
expiredReferences	w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.0be23b1680d7f4f271507185e74b730f908185fa.001.1,2026-09-24T04:48:00-10:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.27c93ef1b29bda3e04166629795fe71aa61e2ea6.001.1,2026-09-23T03:44:00-10:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.59599f54f3e9e47644ed14ad1fd6294e24114766.001.1,2026-09-22T14:48:00-10:00

Locations

Location data

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

Name	Value
SAME	015009
SAME	015001
UGC	HIZ015
UGC	HIZ016
UGC	HIZ017
UGC	HIZ018
UGC	HIZ022
UGC	HIZ023
UGC	HIZ026
UGC	HIZ027
UGC	HIZ028
UGC	HIZ037
UGC	HIZ038
UGC	HIZ039
UGC	HIZ040
UGC	HIZ041
UGC	HIZ042
UGC	HIZ043
UGC	HIZ044
UGC	HIZ045
UGC	HIZ046
UGC	HIZ047
UGC	HIZ048
UGC	HIZ049
UGC	HIZ050
UGC	HIZ051
UGC	HIZ052
UGC	HIZ053
UGC	HIZ054