HAWAII ISLAND – The summits of Mauna Kea and Mauna Loa could get a half a foot of snow tomorrow night.

The National Weather Service in Honolulu says a Winter Storm Watch will go in effect for the Hawaii Island summits above 12500 feet elevation Monday evening into Tuesday.

A trough aloft to the northwest will “destabilize the atmosphere and lift deep tropical moisture over the state over the next few days,” forecasters say. “High elevations on the Big Island will have the potential to receive heavy snow accumulations which will likely focus on Monday night through Tuesday night.”

6 inches or more of snowfall possible on Mauna Kea and Mauna Loa.

A Winter Storm Watch means there is a potential for significant snow, sleet, or ice accumulations that may impact travel.