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Flash Flood watch for all Hawaiian Islands, Winter Storm Warning for summits

Weather advisory map via National Weather Service/NOAA

Weather advisory map via National Weather Service/NOAA

Flash Flood Watch


Hawaii County Civil Defense audio update

Update: Kawa Flats in Ka`u is now open to both directions of traffic.

The National Weather Service in Honolulu has discontinued the Flash Flood Warning for portions of Hawaii Island and have replace it with a Flash Flood Watch through Sunday afternoon (Dec 4) for all Hawaiian Islands.

The combination of deep tropical moisture and an unstable airmass will result in potential for heavy showers and thunderstorms across the state through the weekend.

Rainfall rates from heavier downpours and thunderstorms could cause streams to quickly overflow their banks leading to flash flooding.

Campers and hikers should avoid low lying flood prone areas. People should stay away from streams, drainage ditches and low lying areas prone to flooding. The rainfall and runoff will cause hazardous driving conditions due to ponding, reduced visibility and poor braking action. Excessive runoff may cause rockslides and mudslides in steep terrain.

Debris in streams and gulches may clog bridges and culverts resulting in flooding outside normal water channels causing damage.

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

Mauna Loa looking north towards Mauna Kea. Photo courtesy of Mauna Loa, Hawaii Observatory

Mauna Loa looking north towards Mauna Kea. Photo courtesy of Mauna Loa, Hawaii Observatory

Winter Storm Warning

A Winter Storm Warning is in effect for Hawaii Island summits through 6 p.m. Saturday (Dec 3) for summits above 11,000 feet.

Heavy snow with accumulations 20-30 inches today through Saturday on summits. The heavy snow, drifting snow, strong winds and freezing fog will make for dangerous travel via car or foot. Mauna Kea Access Road to the summit is currently closed.

Winds on the summits are south 10-20 mph with higher gusts. Temperatures in the mid 20s to lower 30s. Visibility is below 1/4 mile at times.

For updated information on summit road conditions visit: mkwc.ifa.hawaii.edu/current/ro…

Winter Storm Watch

A Winter Storm Watch will go into effect Sunday morning through Sunday night (Dec 4) for Hawaii Island summits above 11,000 feet.

Accumulations and timing up to 12 inches of snow expected tonight and saturday at the summits. An additional 12 inches of snow is possible Sunday and Sunday night.

Summits will experience dangerous driving and hiking conditions due to heavy snow blowing and drifting snow and freezing fog. Winds will be from the south 10 to 20 mph with higher gusts. Temperatures will be in the mid 20s to lower 30s with visibility less than 1/4 mile at times.

High Surf Advisory

A High Surf Advisory is in effect until 6 p.m. this evening (Dec 2) for Hawaii Island east facing shores along south, north and east coasts.

Surf in the 6-10 foot range is forecast. Surf will remain at and just above advisory levels today then gradually begin to trend down by tonight through the weekend.

Coastal areas can expect strong breaking waves, shore breaks and strong longshore and rip currents making swimming difficult and dangerous.

Beachgoers, swimmers and surfers should heed the advice given by ocean safety officials and be careful. Know your limits and when in doubt, don’t go out.

Boaters should expect recreational surfers and bodyboarders using harbor channels to access surfing areas.

Small Craft Advisory

A Small Craft Advisory is in effect for Hawaii Island windward, leeward and southeast waters until 6 p.m. Saturday (Dec 3).

For links to the latest weather forecasts, reports, radar and satellite imagery visit our Weather Page at hawaii247.com/weather

NWS Infrared Satellite Image Loop

NWS Infrared Satellite Image Loop

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