A warning has been issued for a "Kona Low" which has hit Hawaii and several of its islands which are set for a "multi-day heavy rain event."
The seasonal cyclone developed over the state on Tuesday night, leading to flood advisories being posted for Kauai, Oahu and Maui in particular.
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"Excessive rainfall and flash flooding is a concern" in these places, the National Weather Service (NWS) said in its most recent area forecast discussion.
Forecasters went on to describe the "multi-day rain event" as "like a fire hose shooting water."
A "Kona Low" is a tropical storm that turns the wind around in the opposite direction, bringing moisture-heavy air.
Its showers are expected to increase throughout Wednesday, especially over the western half of the state, with heavy bands of rain developing with embedded thunderstorms. These will start over Oahu and move eastward towards Maui County by the evening.
The NWS said: "Wednesday night into Thursday looks to the time period for the potential for flash flooding is the highest.
"Due to the widespread rain event, large rises should be expected over streams.
"A Flood Watch is in effect for the entire state starting Wednesday, but for the Wednesday and Thursday time frame, the greatest chance for flooding impacts will be over Oahu and Maui County with Big Island seeing the least chance for flooding impacts."
Flood advisories have been posted for Hawaii island and the islands of Kauai, Oahu and Maui through 4:30 pm. Radar indicated heavy rain over parts of the state with rain rates of 1 to 2 inches per hour. Showers should trend down in the evening. Issued: 2 PM HST pic.twitter.com/SKj51HovEf
— NWSHonolulu (@NWSHonolulu) May 15, 2024
Thursday and Thursday night could see a slight decrease in rain rates, but "a steady stream of moisture with prolonged periods of moderate to locally heavy rain will persist around Oahu and Maui County throughout the day."
By Friday, the "Kona Low" will have begun shifting westward and drier winds will develop over the eastern part of the state—this will decrease the flooding dangers but showers are still possible.
Places like Kauai, in the west, will likely see "persistent showery weather" by this point, although not as widespread as the east will have seen over the next two days.
Even more water is set to be pulled towards Kauai and Oahu, "possibly even in excess of two inches," the NWS said. This means "significant flooding impacts over Kauai this weekend."
People have been warned that there may be property damage in urban or low-lying spots due to runoff, with the possibility of landslides in steep areas.
Honolulu's Flood Watch says: "You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
"Remember that it does not have to be raining at your location for flash flooding to occur. If you notice signs of heavy rain or thunderstorms upslope, move quickly away from flood-prone areas."
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Hawaii 'Kona Low' Map Shows Areas To Be Hit Hardest As Warning Issued - Newsweek
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