Hawaii Island Weather Update # 2 for January 11th, 2020

Notice Level: Advisory (Information Update Needed)


The following weather advisories continue to remain in effect for the Island of Hawaii:


Flood Advisory for North, South, and East Hawaii remains in effect until 3:45 pm Saturday afternoon (January 11th). Rain was falling at rates of up to 2 inches per hour from Upolu Point to South Point. (See Island Rainfall Rates in Update)


Hawaii County Civil Defense reports elevated river levels of the Wailuku River has prompted officials to put all residences who reside along the river corridor were put on notice of the possibility of evacuation, however, some residences have evacuated the area as a precaution. Wailuku River gauge had peaked at 18-feet with a discharge rate of 23,000 cubic feet per second. Numerous road closures remain in effect in East Hawaii as a result of flooding and runoff conditions.


Flash Flood Watch for Hawaii Island has been extended through Sunday afternoon. Unstable and wet conditions are expected to continue through Saturday into Sunday. Heavy showers and the possibility of thunderstorms are expected to continue through the weekend.


Winter Weather Advisory for the summits of Maunakea and Mauna Loa will remain in effect until 6:00 am Sunday morning (January 12th). Snowfall accumulations up to 4-7 inches are expected through Saturday on parts of the summit of Maunakea and Mauna Loa.


Any changes to weather conditions, we will provide an update as it becomes available.

Synopsis:


The persistent wet and windy weather will continue for another couple of days, as an upper-level disturbance lingers near the islands. Brisk easterly trade winds will continue through the weekend, then gradually shift to the southeast direction early next week as low pressure develops west of Kauai. The potential for localized flash flooding will continue through the weekend, especially over windward and mountain areas, where soils remain saturated. Some drying is possible around Tuesday and Wednesday, but another disturbance may bring a return of wet weather, but lighter winds on Thursday and Friday.

The National Weather Service in Honolulu has extended the * Flood advisory for... The island of Hawaii in Hawaii County * Until 345 PM HST. * At 1235 PM HST, radar indicated moderate rainfall persistently forming over the windward slopes, with rainfall rates generally near one inch per hour. Some showers will however occasionally bring briefly heavier bursts of rain. Streams and rivers remain high, and ponding of water continues in low-lying areas. Water levels in the Wailuku River remain elevated, and residents in upper Piihonua should be prepared to take immediate action if water levels rise further, or if a Flash Flood Warning is issued. Locations in the advisory include but are not limited to... Hakalau, Piihonua, Hilo, Pahala, Paauilo, Waipio Valley, Orchidlands Estates, Piihonua, Pahoa, Puna, Pepeekeo, Keaau, Honokaa, Ookala, Hawaiian Paradise Park and Kawa Flats. 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. && This advisory may need to be extended beyond 345 PM HST if heavy rain persists. A Flash Flood Watch remains in effect. Be prepared to take immediate action if a Flash Flood Warning is issued.

FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SUNDAY AFTERNOON

The Flash Flood Watch continues for


* Kahoolawe, Kauai, Lanai, Maui, Molokai, Niihau, Oahu and the

Big Island.


* Through Sunday afternoon


* An upper level low to the west, combined with enhanced low

level moisture and strong trade winds will bring the possibility

of flash flooding. Although heavy rain will be possible over

leeward locations, the areas most susceptible to flooding will

be windward and mountain locations, where grounds are already

saturated from previous rainfall.


* The extended period of rain could cause flooding in low spots

which could make some roadways impassable. Debris in streams

and gulches may clog bridges and culverts. Strong winds may

cause tree branches to fall which will potentially add to the

amount of debris.


PRECAUTIONARY/PREPAREDNESS ACTIONS


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.

WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 AM HST SUNDAY


* WHAT...Snow. Additional snow accumulations up to 3 inches.


* WHERE...Big Island Summits.


* WHEN...Until 6 AM HST Sunday.


* IMPACTS...Travel could be very difficult. Blowing snow may

significantly reduce visibility at times, with periods of zero

visibility.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet, or

freezing rain will cause travel difficulties. Be prepared for

slippery roads and limited visibilities and use caution while

driving.

The Hawaii Police Department (HPD) and Hawaii County Civil Defense report the following road, lane, and park closures are currently in effect:

  • Kamehameha Avenue/Bayfront Highway/Pauahi Street remains closed to due heavy runoff and ponding from the Alenaio River.

  • Road to the summits of Maunakea and Mauna Loa remain closed until further notice due to winter weather conditions.

  • Coconut Island, Bayfront Parks, Onekahakaha, Kealoha, and Spencer Beach Park remain closed through Saturday.

Message from Hawaii County Civil Defense:


A Flash Flood Watch means that conditions are favorable for flash flooding. Due to the Flash Flood Watch, the following advisories are issued;

  • Communities along the Wailuku River at risk for flooding have been contacted in case water levels rise further and evacuation becomes necessary.

  • Do not cross fast flowing water by vehicle or on foot.

  • Be on the alert for run-off, ponding of water, and debris.

  • A Shelter has been designated at the Butler Building at Afook Chinen Auditorium if evacuations are needed. 

  • Road closures in Hilo include Kamehameha Avenue, Bay Front Highway and Aupuni Street.

Stay tuned to your radio for updates and changes in conditions.


This is your Hawaii County Civil Defense Agency.

HECO, Hawaiian Telcom, Spectrum, and other carriers report no outages at this time and can change without notice. Any changes, we will provide an update as it becomes available.

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