(BIVN) – The National Weather Service in Honolulu has issued a Winter Weather Advisory for Big Island summits until 6 p.m. Sunday.

A Winter Weather Advisory means that periods of snow, sleet or freezing rain will cause travel difficulties, forecasters say, adding that motorists should “be prepared for slippery roads and limited visibilities, and use caution while driving.”

At 3:30 p.m. Saturday, the National Weather Service reported:

Mixed precipitation occurring. The ice will result in difficult travel conditions. Additional snow accumulations of up to one inch and ice accumulations of around one tenth are expected.

The road to the summit of Mauna Kea is closed to the public at the Visitor Information Station (elevation of 9,200 feet) due to thick fog, high humidity, freezing temperatures, snow and black ice. Rangers say they will continue to monitor the conditions.