Wednesday, April 18, 2018, 3:44 a.m.: The National Weather Service in Honolulu has issued a Flash Flood Watch for the entire state of Hawai‘i from Thursday morning, April 19, through Friday afternoon, April 20.
Deep moisture associated with an old frontal boundary lingering across the state in combination with an upper level trough moving through the area, will bring the threat for heavy rainfall and flash flooding.
The heaviest rainfall is expected to fall from O‘ahu eastward to the Big Island.
Even though widespread heavy rainfall is not expected on Kaua‘i, many areas have recently received a significant amount of rainfall and the soils remain saturated. As a result, even moderate rain falling for a extended period in these harder hit areas of Kaua‘i could lead to Flash Flooding.
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Rapidly rising water levels may occur on area streams and significant flooding may occur in low-lying and poor drainage areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS
A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.
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Monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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