Flash Flood Watch, Winter Storm Warning and other advisories for Hawaii Island

Weather advisory map via National Weather Service/NOAA



Timelapse movies of the snowfall on Mauna Loa and Mauna Kea. Views on Mauna Loa are looking north with Mauna Kea in the distance.

Flash Flood Watch

A Flash Flood Watch remains in effect for Hawaii Island through Sunday afternoon (Dec 4).

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

Winter Storm WARNING

A Winter Storm Warning is in effect for Hawaii Island summits 6 a.m. Sunday morning through 6 a.m. Monday (Dec 5) for summits above 11,000 feet.

A light dusting of snow and ice is possible through tonight with an additional 6-12 inches of snow expected Sunday and Sunday night. The winter conditions will make for dangerous travel via car or foot.

Winds on the summits are south 15-30 mph with higher gusts. Temperatures in the upper 20s to mid 30s. Visibility is below 1/4 mile at times.

Mauna Kea Access Road to the summit is currently closed.

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

High Surf Advisory

A High Surf Advisory is in effect until 6 p.m. this evening (Dec 3) for east facing shores of Hawaii Island.

Surf is forecast to be in the 5-8 foot range.

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 and th Alenuihaha Channel until 6 p.m. this evening (Dec 3).

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