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Hawaii Island Weather Update for March 18th, 2020

Notice Level: Precautionary (Information Update Needed)

A Flash Flood Watch for Hawaii Island has been extended until Thursday evening (March 19th). A Kona low to the west of the state will continue to produce bands of moderate to heavy rain along with the possibility of thunderstorms across areas around the state.

Winter Weather Advisory for the summits of Maunakea and Mauna Loa remains in effect until Wednesday evening (March 18th). Snowfall occurred on both summits and overnight and with the possibility of more snow through today. (See Post for Further Details)

Published By: HIRSC Team - Southern Nevada (Henderson) Section and Weather Unit

FLASH FLOOD WATCH NOW IN EFFECT THROUGH THURSDAY AFTERNOON... The Flash Flood Watch is now in effect for * All Hawaiian Islands. * Through Thursday afternoon. * A kona low west of the state will continue to produce bands of heavy rain and thunderstorms across portions of the island chain through Thursday. While all islands could experience flooding rainfall, the greatest risk for flooding will be on Kauai and Oahu where soils remain saturated due to recent heavy rain. Another large heavy shower band forming just west of Kauai will move into the western half of the state later this morning. * Heavy rain will likely affect urban and leeward locations, as well as lower elevations, which are more vulnerable to flooding impacts. 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 REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Snow. Additional snow accumulations of up to 5 inches are expected. * WHERE...Big Island Summits above 12,000 feet elevation. * WHEN...Until 6 PM HST Wednesday. * IMPACTS...Travel could be very difficult. Roads to the summits are closed to the public. 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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