(BIVN) – The summits of Maunakea and Mauna Loa will be under a Winter Storm Watch from Thursday evening through Friday afternoon.

The National Weather Service in Honolulu says heavy snow will be possible, with total accumulation in excess of 6 inches. Plan on difficult travel conditions on mountain summits above 12,000 feet.

“Increasing mid to high clouds ahead of a disturbance aloft may produce snow on the high summits,” forecasters wrote on Wednesday afternoon. “Moisture will increase late Thursday night and early Friday, leading to snow,” they said.

The Mauna Kea Observatories Forecast said at 5 p.m. that blizzard-like conditions will be possible at the summit particularly around Friday morning.