Hawaii Severe Flash Flood Warning | Effective 09/10/2026 01:18

Headline: 
Flash Flood Warning issued September 9 at 10:18PM HST until September 9 at 11:30PM HST by NWS Honolulu HI
Event: 
Flash Flood Warning
Urgency: 
Immediate
Effective: 
September 10, 2026 - 1:18am
Expires: 
September 10, 2026 - 2:30am
Description: 
At 1018 PM HST, radar continues to show rain forming and moving over the Kau and Puna districts, with rainfall rates up to 1 inch per hour. Big Island Civil Defense reports water over Highway 11 in multiple locations between Pahala and Naalehu. HAZARD...Flash flooding caused by heavy rain. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Some locations that will experience flash flooding include... Hawaiian Paradise Park, Hawaii Volcanoes National Park, Wood Valley, Volcano, Pahala, Glenwood, Punaluu Beach, Kawa Flats, Mountain View, Hawaiian Acres and Naalehu.
Instruction: 
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Area Description: 
Hawaii in Hawaii, HI
Forcast Office: 
NWS Honolulu HI
Sender: 
w-nws.webmaster@noaa.gov