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Remnants of Hilda bring heavy rain to Hawaii Island, Flash Flood Watch in effect

Weather advisory map via National Weather Service/NOAA

Weather advisory map via National Weather Service/NOAA


4:15 p.m. Friday (Aug 14) Hawaii County Civil Defense audio message


Rainbow Falls in Hilo, Hawaii saw the swollen stream churn muddy water over the falls.

The remnants of Hilda are moving over Hawaii Island producing heavy rainfall a flash flood watch is in effect until a.m. Saturday (Aug 13). There may be thunderstorms, mudslides and streams overflowing their banks. A flood advisory has been issued for the areas including, but not limited to, Kainaliu, Kealakekua, Hawaiian Ocean View Estates, Keauhou and Kailua-Kona.

At 3:26 p.m. weather radar showed heavy rain continuing over the South Kona district with the highest rates of two inches per hour reported by a rain gage at Honaunau. Moderate to heavy rainfall has also developed over the Ka‘u district near Wood Valley and along the Mamalahoa Highway (Hwy 11) between Pahala and Naalehu. The area of rainfall has been shifting slowly southward.

A record rainfall of 2.42 inches was set at Hilo International Airport Thursday (Aug 13). This breaks the old August 13th record of 1.66 inches set in 1969.

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 hawaii247.com/weather


A view over Hilo from Mauna Kea summit courtesy of the Canada-France-Hawaii Telescope CloudCam on the night of August 13-14, 2015. Line patterns overlaid are constellations, the white lines streaking across the sky are meteors. August 12-13 was the peak for the Perseids meteor shower. Flashes from lightning can also be seen but it is very cloudy so no bolts can be seen. Courtesy CFHT

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