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Flash flood watch issued for Hawaii Island and Maui beginning Friday night (July 22)

Weather advisory map via National Weather Service/NOAA

Weather advisory map via National Weather Service/NOAA

11 a.m. Thursday (July 21) Hawaii County Civil Defense audio message

The National Weather Service in Honolulu has issued a flash flood watch in effect from late Friday night (July 22) through Sunday afternoon (July 24) for Hawaii Island and Maui.

Tropical Storm Darby is expected to continue to approach Hawaii and depending on the track it is possible for intense rainfall and flash flooding to occur this weekend. The greatest risk of flash flooding will be to east and southeast facing slopes.

In addition to flood prone areas heavy rain events of this size may cause flooding in areas outside the designated flood zones. Low spots in roads can become dangerous and impassable due to severe runoff. High amounts of debris in streams and gulches may clog bridges and culverts resulting in dangerous flooding which could occur outside the normal channels and could also lead to significant property damage.

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.

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