UPDATE 8: Flash Flood Watch Remains Active

April 11, 2019, 6:14 AM HST (Updated April 11, 2019, 5:09 PM)
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UPDATE 8: 5 PM, Thursday, April 11, 2019

The National Weather Service has cancelled the Flood Advisory for Hawai‘i Island. The Flash Flood Watch remains active through Friday.

This forecast means conditions may develop that lead to flash flooding.

Residents in flood-prone areas are advised to be on the alert for possible flooding conditions.

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Motorists are urged to exercise caution while driving. Road closures may occur without notice.

The Hawai‘i Police Department reports all main roads are open at this time.

Thunderstorms are expected. If lightning threatens your area, the safest place to be is indoors.

UPDATE 7: 3:45 PM, Thursday, April 11, 2019

National Weather Service Honolulu reports the High Surf Advisory will remain in effect until 6 p.m. Sunday, April 14, 2019.

SURF: 6 to 9 feet along east facing shores of Kaua‘i, O‘ahu, Moloka‘i, Maui and Big Island tonight, rising to 8 to 12 feet late Friday through Saturday.

IMPACTS: Moderate…Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous.

PRECAUTIONARY/PREPAREDNESS ACTIONS: Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. When in doubt, don’t go out.

A Small Craft Advisory also remains in effect until 6 p.m. Sunday, April 14.

Winds and Seas: East winds 20 to 30 knots with higher gusts. Seas 7 to 12 feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS

A Small Craft Advisory means that wind speeds of 25 to 33 knots and/or seas 10 feet or greater are expected to produce conditions hazardous to small craft. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in these conditions.

The Flood Advisory for the Island of Hawai‘i will expire at 4 p.m.

Weather radar showed that heavy rain has ended.

A Flash Flood Watch remains in effect for the Big Island through Friday.

UPDATE 6: 3:30 PM, Thursday, April 11, 2019

The Flash Flood Watch continues for Maui and the Big Island. Through Friday afternoon, April 12, 2019.

A broad upper level low nearing the Big Island from the east will remain in the area through Friday. Cold air aloft and instability associated with this upper feature combined with plenty of moisture will lead to periods of heavy showers and thunderstorms. Rainfall will become heavy at times, potentially leading to flash flooding. Although most of the activity will focus over windward areas with strong trades in place, heavy showers and thunderstorms will also remain possible across leeward areas.

A Flash Flood Watch means that conditions are favorable for flash flooding. Flash flooding is LIFE THREATENING. Do not cross fast flowing water in your vehicle or on foot.

Monitor later forecasts and be prepared to take action if a Flash Flood Warning is issued. If you experience heavy rain or rising water, head to higher ground immediately.

A Winter Weather Advisory for Big Island Summits above 11,500 feet remains in effect

A broad upper level low nearing the Big Island from the east will remain in the area through Friday. Cold air aloft and instability associated with this upper feature combined with plenty of moisture will bring periods of snow for the Big Island Summits through Friday night.

Snow and ice accumulation is occurring. Plan on slippery road conditions. Additional snow accumulations of 1 to 3 inches is expected.

A Winter Weather Advisory for snow means periods of snow will cause travel difficulties. Be prepared for snow covered roads and limited visibilities, and use extreme caution while driving.

UPDATE 5: 1:10 PM, Thursday, April 11, 2019

The Flood advisory for the Island of Hawai‘i has been extended until 4 p.m.

At 1:06 PM HST, radar indicated bands of heavy rain and  thunderstorms near Orchidlands Estates extending north to Laupahoehoe. Rain was falling at a rate of 1 to 2 inches per hour.

Locations in the advisory include but are not limited to Hilo, Hawaiian Acres, Laupahoehoe, Orchidlands Estates, Hawaiian Paradise Park, Glenwood, Pepe‘ekeo, Kea‘au, Pāhoa, Hōnomu, Mountain
View and Papa‘ikou.

UPDATE 4: 11:00 AM, Thursday, April 11, 2019

The National Weather Service has issued a Flood Advisory for Hawai‘i Island for the areas from Hāmākua, Hilo and Puna.

A Flood Advisory is issued when flooding is expected or occurring.  Problems such as flooding in low-lying areas and areas of poor drainage, as well as minor flooding of streets and roadways are possible

An island wide Flash Flood Watch issued by the National Weather Service is in effect through Friday.

UPDATE 3: 10:13 AM, Thursday, April 11, 2019

The National Weather Service in Honolulu has issued a Flood Advisory for Hawai‘i County until 1:15 p.m.

At 10:10 a.m., radar indicated heavy rain moving onshore near Orchidlands Estates extending north to Laupahoehoe. Rain was falling at a rate of 1 to 2 inches per hour.

Locations in the advisory include but are not limited to Hilo, Hawaiian Acres, Orchidlands Estates, Pepe‘ekeo, Kea‘au, Hawaiian Paradise Park, Pāhoa, Honomu, Mountain View, Papaikou, Ninole and Hakalau.

PRECAUTIONARY/PREPAREDNESS ACTIONS

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.

UPDATE 2: 8 AM: National Weather Service

Flash Flood Watch

The National Weather Service continues the Flash Flood Watch for Hawai‘i Island through Friday. The Flood Advisory for South Hilo and Puna has been cancelled.

A Flash Flood Watch means conditions are favorable for flash flooding to occur.

Due to the Flash Flood Watch the following policies are in effect:

  • Motorists are urged to drive with caution as road closures can occur without notice.
  • Flash Flooding is life threatening. Do not cross fast moving water. Turn around, don’t drown.
  • If lightning threatens your area, the safest place to be is indoors.

Police reports that all roads are open at this time.

High Surf Advisory

The National Weather Service continues the High Surf Advisory through Sunday for east-facing shores of Hawaii Island from Kohala through Puna to Ka‘ū Districts.

A High Surf Advisory means there is a threat to life and property from surf. The most dangerous times will coincide with high tides on Friday and Saturday evenings.

Due to the High Surf Advisory, the following is in effect:

  • Beach-goers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. If in doubt, get out.

There are no beach park closures at this time.

UPDATE 1: 7:12 AM 

THE FLOOD ADVISORY FOR HAWAI‘I COUNTY EXPIRED AT 7:15 a.m.

Weather radar showed that heavy rain has ended.

A flash flood watch remains in effect for the Big Island through Friday afternoon.

ORIGINAL POST: 6 AM: COUNTY OF HAWAII Civil Defense Message

Flash Flood Watch

The National Weather Service has issued a Flash Flood Watch for Hawai‘i Island through Friday.

A Flash Flood Watch means conditions are favorable for flash flooding to occur.

Flood Advisory

The National Weather Service has issued a Flood Advisory for South Hilo and Puna.

A Flood Advisory means that rainfall and runoff will cause hazardous conditions due to ponding, reduced visibility, and poor braking action.

Due to the Flash Flood Watch and Flood Advisory, the following policies are in effect:

  • Motorists are urged to drive with caution as road closures can occur without notice.
  • Flash Flooding is life threatening. Do not cross fast moving water. Turn around, don’t drown.
  • If lightning threatens your area, the safest place to be is indoors.

Police reports that all roads are open at this time.

High Surf Advisory

A High Surf Advisory is issued for Hawai‘i Island for east-facing shores from Kohala through Puna to Ka‘ū Districts through Sunday.

A High Surf Advisory means there is a threat to life and property from surf. The most dangerous times will coincide with high tides on Friday and Saturday evenings.

Due to the High Surf Advisory, the following policy is in effect:

  • Beach-goers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. If in doubt, get out.

There are no beach park closures at this time.

Conditions are being monitored and you will be kept informed of any changes that may affect your safety.

3:40 AM, National Weather Service

WIND ADVISORY NOW IN EFFECT UNTIL 6 AM HST FRIDAY

WINDS: NE 20 to 30 mph with localized gusts to 50 mph are expected across the South Kohala district of the Big Island. Winds will be strongest over and immediately downwind of
mountains.

IMPACTS: Winds this strong could down tree branches and cause localized power outages. Motorists, especially those in high profile vehicles, are urged to drive with extreme caution.

PRECAUTIONARY/PREPAREDNESS ACTIONS

A Wind Advisory means that sustained winds of at least 30 mph, or gusts of at least 50 mph, are expected. Motorists should use extra caution.

WINTER WEATHER ADVISORY FOR BIG ISLAND SUMMITS ABOVE 11,000 FEET

A broad upper level low nearing the Big Island from the east will remain in the area through Friday. Cold air aloft and instability associated with this upper feature combined with plenty of moisture will bring periods of snow for the Big Island summits through 6 a.m. Saturday night.

Plan on slippery road conditions. Total snow accumulations of 1 to 3 inches, with localized higher
amounts, are expected.

Be prepared for reduced visibilities at times in snow, along with blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS

A Winter Weather Advisory for snow means periods of snow will cause travel difficulties. Be prepared for snow covered roads and limited visibilities, and use extreme caution while driving.

3:32 AM: SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 6 PM HST SUNDAY

Alenuihaha Channel-Big Island windward, leeward Waters- and SE waters.

Winds and Seas: East winds 20 to 30 kt. Seas 8 to 12 feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS

A Small Craft Advisory means that wind speeds of 25 to 33 knots and/or seas 10 feet or greater are expected to produce conditions hazardous to small craft. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in these conditions.

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