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Hawaii Island Information Update for January 9th, 2020

Notice Level: Advisory (Information Update Needed)

Wind Advisory for parts of Hawaii Island remains in effect until 6:00 am Friday morning (January 10th). Winds of 25 to 35 mph with stronger gust up to 50 mph are expected through tonight into Friday morning.

Flash Flood Watch for Hawaii Island remains in effect until 7:00 pm Saturday evening (January 11th). Heavy showers and the chance of thunderstorms are possible over the next few days.

Winter Weather Advisory for the summits of Maunakea and Mauna Loa remains is in effect until 6:00 am Saturday morning (January 11th). Snowfall accumulation up to 4-inches is expected in some parts of the summit.

No outages to cable, phone, or electricity to report as 10:00 pm Thursday evening. Also, no road or lane closures to report as of 10:00 pm Thursday evening related to the wind or weather events.


An increase in showers is expected tonight through Saturday as an upper trough slowly approaches the state from the east. Periods of heavier rainfall will be possible, especially over windward and mauka areas, but the windy trades should keep the showers moving fairly quickly. Winds are expected to slightly decrease later in the weekend and gradually shift out of the east-southeast as a trough develops west of the state early next week. This could lead to more unsettled weather especially for the western half of the state during the first half of next week.

FLASH FLOOD WATCH NOW IN EFFECT THROUGH SATURDAY AFTERNOON... The Flash Flood Watch is now in effect for * Maui and the Big Island. * Through Saturday afternoon * An unstable airmass will move over the islands tonight and into the weekend, bringing an increase in enhanced showers across the area but primarily the eastern islands. While showers will be possible over most areas, the areas most susceptible to flooding will be windward locations which have already received rain this week. * 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.

WIND ADVISORY NOW IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Northeast winds 25 to 35 mph with gusts up to 50 mph. * WHERE...Lanai, Kahoolawe, and portions of Maui, Oahu and the Big Island. The strongest winds will be through gaps as well as over and downslope of ridges. On Oahu this includes areas over and downslope of the Koolau and Waianae ranges. On the Big Island this includes areas over and downslope of the Kohala mountains, as well as through the Saddle and around South Point. On Maui this includes areas in and around Kahului southward through Maalea Bay. * WHEN...Until 6 AM HST Friday. * IMPACTS...Winds this strong can down tents, knock down tree branches, make it difficult to steer high profile vehicles, and can cause power outages. 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 IN EFFECT UNTIL 6 AM HST SATURDAY... * WHAT...Snow. Additional snow accumulations of up to 4 inches. * WHERE...Big Island Summits. * WHEN...Until 6 AM HST Saturday. * 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.

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