Hilo, HI – A Winter Weather Advisory is in effect for the Big Island summits from 6 p.m. Monday to 6 p.m. Tuesday, as deepening moisture from an upper-level low brings periods of snow and a rain–snow mix to the highest elevations, according to the National Weather Service (NWS) Honolulu. Snow accumulations of up to 4 inches are possible over the next 24 hours.
The advisory impacts the summits of Mauna Kea and Mauna Loa, where temperatures will be cold enough to support intermittent snow showers. At times, precipitation may switch between snow and rain, creating challenging conditions for drivers and summit crews.
According to NWS Honolulu, moisture from an upper-level low positioned southwest of the islands is expected to spread over the eastern end of the state, increasing the likelihood of summit snow showers through Tuesday. Although snowfall rates are not expected to be heavy, the combination of snow, icy spots, and periods of reduced visibility could cause slippery and hazardous travel on summit access roads.
These conditions may impact astronomers, observatory staff, and visitors attempting to travel to the high elevations. Summit roads on Mauna Kea—often subject to closure during winter events—could see restricted access depending on visibility and surface conditions overnight.
NWS Honolulu urges travelers to use caution, slow down, and be prepared for rapidly changing conditions. Limited visibility and slick pavement may develop during snow bursts, particularly during the overnight and early morning hours.
Snow showers are expected to taper later Tuesday afternoon as the low weakens and moisture begins to lift away from the Big Island.
Residents and visitors planning high-elevation travel should stay updated with forecast changes and verify road status with summit officials before heading uphill.
