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UPDATE 3: Flood Advisory/Flash Flood Watch Extended

February 15, 2018, 10:45 AM HST (Updated February 15, 2018, 4:12 PM)
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UPDATE 3: Feb. 15, 4:04 p.m.

The National Weather Service in Honolulu has issued a Flood Advisory for Hawai‘i County until 7 p.m.

At 3:57 p.m., radar showed two areas of moderate to locally heavy showers affecting the Big Island, with isolated showers falling at  rates in excess of two inches per hour.

Persistent showers continue  to fall along the south and southeast slopes of the Ka‘ū and Puna Districts, especially in the Volcanoes National Park.

Showers along a weak front are affecting the North Kona and Kohala Districts and will move down the western coast through the remainder of the afternoon.

Locations in the advisory include but are not limited to Kailua-Kona, Na‘alehu, Waipio Valley, Kukuihaele, Hawi, Honaunau, Kamuela, Kawaihae, Kahaluu-Keauhou, Kealakekua, Kawa Flats and Kapa‘au.

Stay away from streams, drainage ditches and low lying areas prone to flooding.

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Rainfall and runoff will also cause hazardous driving conditions due  to ponding, reduced visibility and poor braking action.

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

This advisory may need to be extended beyond 7 p.m. HST if heavy rain
persists.

This advisory replaces the previously issued advisory that was in effect for portions of the island of Hawaii County.

A Flash Flood Watch remains in effect through tonight.

UPDATE 2: Feb. 15, 3:30 p.m.

A Flash Flood Watch has been issued for the Big Island, in effect through Friday, Feb. 16, 2018, at 6 a.m.

A weak front stalling near the Big Island will maintain chances for heavy showers through the night.

A weak front will stall over the Big Island, and an upper level low to the north will maintain enough instability to trigger heavy showers over portions of the Big Island tonight.

A Flash Flood Watch means that conditions may develop that lead to flash flooding.

Flash flooding is a VERY DANGEROUS SITUATION.

Monitor forecasts and be prepared to move to higher ground if  heavy rain occurs or a Flash Flood Warning is issued.

UPDATE: Feb. 15, 1:30 p.m.

The Flood Advisory for Hawai‘i County has been extended until 430 p.m.

At 1:29 p.m., radar showed continuous moderate rainfall along south- and southeast-facing slopes of the Ka‘ū and Puna Districts, with isolated heavy showers falling at rates of more than two inches per hour.

The most persistent rainfall has been observed in Hawai‘i Volcanoes National Park and near Pahala.

Locations in the advisory include but are not limited to Volcano, Na‘alehu, Pahala, Wood Valley, Kawa Flats and Punalu‘u Beach.

Stay away from streams, drainage ditches and low lying areas prone to flooding.

Rainfall and runoff will also cause hazardous driving conditions due to ponding, reduced visibility and poor braking action.

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

This advisory may need to be extended beyond 4:30 p.m. if heavy rain persists.

This advisory replaces the previously issued advisory that was in effect for portions of the Island of Hawai‘i.

A Flash Flood Watch is remains in effect.

ORIGINAL POST: Feb. 15, 2018, 10:45

The National Weather Service in Honolulu has issued a Flood Advisory for Hawai‘i County, which is in effect until 1:30 p.m.

At 10:33 a.m., radar showed continuous moderate rainfall along south- and southeast-facing slopes of the Ka‘ū and Puna Districts, with isolated heavy showers falling at rates of more than two inches per hour.

The most persistent rainfall has been observed in Hawai‘i Volcanoes National Park and near Pahala, where the Pa‘auau Gulch gauge has measured a rapid rise in stream flow.

Locations in the advisory include but are not limited to Volcano, Kalapana, Na‘alehu, Pahala, Wood Valley, Kawa Flats and Punalu‘u Beach.

Stay away from streams, drainage ditches and low lying areas prone to flooding.

Rainfall and runoff will also cause hazardous driving conditions due to ponding, reduced visibility and poor braking action.

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

This advisory may need to be extended beyond 1:30 p.m. if heavy rain persists.

A Flash Flood Watch also remains in effect.

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