Categorized | News, Weather

Flash flood watch for Hawaii Island, intermittent road closure in Ka‘u due to flooding

Mamalahoa Highway (Hwy 11) in Ka‘u is closed between the 58 and 59 mile markers due to flooding across the roadway making it impassible. There is no projection as to when the roadway will open due to heavy rains.

Update: At 8:15 p.m. Police reported Mamalahoa Highway (Hwy 11) in Ka‘u between the 58 and 59 mile markers has re-opened to traffic.

6:30 p.m. Hawaii County Civil Defense Message

Weather advisory map via National Weather Service/NOAA

Weather advisory map via National Weather Service/NOAA

UPDATED (8:15 p.m. on 8/24/2015)

Police report Mamalahoa Highway (Hwy 11) in Ka‘u between the 58 and 59 mile markers has re-opened to traffic.

UPDATED (6:15 p.m. on 8/24/2015)

The National Weather Service Flash Flood Watch for Hawaii Island remains in effect. Due to unstable weather conditions and very moist air across the state, the flash flood watch will remain in effect through 6 p.m. Tuesday (Aug 25).

Currently heavy rains and occasional thunder and lighting can be expected across all areas of the island.

With the ongoing upper slope rains and runoff Mamalahoa Highway (Hwy 11) near the Whitington Beach Park in Kau is experiencing intermittent road closure due to flooding conditions. Presently the highway is open to one lane traffic however, motorists are advised to avoid the area and to use alternate routes if possible.

All other major highways and roadways are opened at this time however motorists are advised to drive carefully and to be prepared for hazardous conditions, ponding, and runoff, and to anticipate traffic delays.

Lastly, in consideration of the hazardous road conditions, the joint Puna Council public meeting scheduled for tonight at the Mountain View School has been cancelled.

Campers and hikers should avoid low lying flood prone areas. People should stay away from streams, drainage ditches and low lying areas prone to flooding. The rainfall and runoff will cause hazardous driving conditions due to ponding, reduced visibility and poor braking action. Excessive runoff may cause rockslides and mudslides in steep terrain.

Do not cross fast flowing or rising water in your vehicle or on foot. Turn around, don’t drown.

For links to the latest weather forecasts, reports, radar and satellite imagery visit our Weather Page at

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