(BIVN) – The National Weather Service in Honolulu has issued a Flash Flood Watch for Hawaiʻi Island starting from midnight tonight and through Friday afternoon.

A Winter Weather Advisory has also been issued for the summits of Mauna Kea ad Mauna Loa.

According to the National Weather Service:

An upper level low approaching the islands from the northeast will bring an unstable airmass to Maui and the Big Island. High pressure to the northeast will maintain a trade wind surface flow, focusing the heaviest of rain along windward areas. However the strong trade winds and the unstable airmass will allow for showers and thunderstorms to form over additional areas of Maui and the Big Island. The upper level low is expected to linger near these areas through the end of the week.

Also, “cold air aloft and instability associated with this upper feature combined with plenty of moisture will bring the possibility of snow for the Big Island Summits through Friday night,” forecasters say.

Total snow accumulations of 1 to 3 inches, with localized amounts up to 6 inches, are expected.