Winter Storm Warning
The National Weather Service in Honolulu has issued a Winter Storm Warning for Hawaii Island summits through 6 p.m. Friday for summits above 12,000 feet.
Heavy snow with accumulations in excess of 6-12 inches is possible on summits. There is also the potential for sleet and also ice accumulations on summit roadways. 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 east to southeast 25-40 mph with gusts up to 50 mph. Temperatures in the mid 20s to lower 30s. Visibility is low as a half-mile.
For updated information on summit road conditions visit: mkwc.ifa.hawaii.edu/current/ro…
Flash Flood Watch
A nearby upper level low and deep moisture will continue to cause areas of heavy showers and thunderstorms. This general pattern will continue for the next several days. 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.
High Surf Advisory
A High Surf Advisory is in effect until 6 p.m. Friday (Dec 2) for Hawaii Island east facing shores along south, north and east coasts.
Surf in the 6-10 foot range is forecast.
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.
A Wind Advisory is in effect for Hawaii Island until 10 p.m. this evening (Nov 30). Areas of strong trade winds will be in Ka‘u, North and East Kohala, interior locations, South Point, Pahala, Hilo, Volcano, Honokaa, Waimea, Waikoloa, Bradshaw Field and the Saddle Road area above 5,000 feet in elevation.
Winds are forecast to be in the 25-35 mph range with gusts to 50 mph.
The strong winds can send trees, branches and other objects into roadways, power lines and/or equipment. Winds this strong can damage roofs and cause flying debris if outdoor items are not properly tied down. These winds can make driving difficult especially for high profile vehicles. The winds can also forcefully swing doors open or shut so use caution when opening or closing vehicle doors.
Hawaii Electric Light Company (HELCO) reminds people that if you see a downed power line you should stay as far away as possible and report any damage or outages to their dispatch center at (808) 969-6666.
A Gale Warning remains in effect until 6 p.m. this evening (Dec 1) for the Maalaea Bay, the Pailolo and Alenuihaha Channels.
Winds and sea are forecast to have east gales 30-35 knots, rough seas 10-15 feet with levels being the highest in the channels and south of Hawaii Island.
Small Craft Advisory
A Small Craft Advisory is in effect for Hawaii Island windward waters until 6 p.m. Friday (Dec 2). A high pressure system northeast of the island will produce strong trade winds across the state.
Windward waters will experience east to northeast winds 25-30 knots and seas 9-12 feet.
Marine Weather Statement
Strong and gusty winds and dangerous lightning is forecast for the Alenuihaha Channel, Hawaii Island windward, leeward and southeast waters.
An area of showers and thunderstorms moving west and northwest over Hawaii island and Maui coastal waters will produce strong and gusty winds to 33 knots, cloud to surface lightning strikes and visibility below 1 nautical mile in heavy rain. Some storms are capable of producing even stronger wind gusts and could pose a serious hazard for boaters. Consider remaining in harbor and if heading out remain alert for hazardous weather and possible marine warnings.
For links to the latest weather forecasts, reports, radar and satellite imagery visit our Weather Page at hawaii247.com/weather