UPDATE: Thunderstorms, Downpours May Redevelop Tonight or Friday

September 15, 2016, 6:58 AM HST
* Updated September 16, 10:43 AM
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Sept. 15, 3 p.m. NOAA/NWS

Sept. 15, 3 p.m. NOAA/NWS

Sept. 16, 6 a.m. NOAA/NWS

Sept. 16, 6 a.m. NOAA/NWS



UPDATE: Thursday, Sept. 15, 4 p.m.

The Flash Flood Watch issued by the National Weather Service remains in effect through tomorrow afternoon for Hawai‘i Island. Abundant tropical moisture and unstable air mass are contributing to the threat of heavy rainfall and potential for flash flooding.

Conditions have improved considerably today in the wake of earlier thunderstorms, but the air mass remains very moist and unstable, so there is a chance for additional thunderstorms with very heavy downpours to redevelop tonight or Friday.


In many areas the ground is saturated from recent rainfall and additional heavy rain could easily lead to flash flooding.


The public is advised to take precautionary actions. A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is very dangerous. You should monitor later forecasts and be prepared to take action should flash flood warnings be issued.

ORIGINAL POST: Thursday, Sept. 15, 7 a.m.

The National Weather Service issues a Flash Flood Watch at 3:25 a.m. Sept. 15, 2016, now in effect for the Big Island through Friday afternoon.


A very moist and unstable air mass interacting with an upper level trough will result in unsettled weather with the potential for flash flooding.

The evacuation shelter at Paauilo Gym has been closed.

Hawaii Electric Light reports power restoration repair efforts have begun for those areas with power outages.


For further information please contact the Kaloko-Honokōhau National Historical Park visitor center at 326-9057.

Hawaii Police Department reports South Kopua Road in Glenwood is flooded 1.5 miles in from Route 11. Traffic is rerouted through alternate routes.

A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is very dangerous.

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