Big Island, Hawaii – Hazardous winter conditions are possible at the highest elevations of the Big Island as a Winter Storm Watch remains in effect through early next week.
According to the National Weather Service in Honolulu, a Winter Storm Watch is in effect from Saturday afternoon through Monday afternoon for the summits of Mauna Kea and Mauna Loa, generally above 11,000 feet. Forecasters warn that heavy snowfall is possible, with storm-total accumulations exceeding 12 inches in some areas.
Strong winds are also expected, with gusts reaching up to 50 miles per hour, which could lead to significant blowing snow and periods of near-zero visibility. These conditions may make travel very difficult to impossible, particularly during the height of the storm.
The winter weather threat is being driven by a disturbance aloft combined with abundant moisture, creating a setup favorable for prolonged snowfall at summit level. The National Weather Service cautions that conditions can deteriorate rapidly, especially during heavier snow bands and stronger wind periods.
Travel impacts are expected along Mauna Kea Access Road and Mauna Loa Observatory Road, where snow accumulation, drifting, and whiteout conditions may occur. Access to summit facilities may be restricted or closed if conditions worsen.
The watch specifically affects hikers, campers, astronomers, and anyone planning summit travel, including commercial and research operations. Officials strongly advise monitoring forecast updates and being prepared for rapidly changing weather.
A Winter Storm Watch indicates that significant winter weather is possible, though confidence on exact timing and totals will increase as the event approaches. The watch may be upgraded to a Winter Storm Warning if conditions become more certain.
Anyone considering travel to the Big Island summits this weekend is urged to postpone plans if possible, carry appropriate cold-weather and survival gear, and remain alert for updates from the National Weather Service.
