(BIVN) – The National Weather Service in Honolulu says a Winter Storm Warning and a Flash Flood Watch are now in effect for Hawaii Island until 6 p.m. Friday.

Heavy snow is expected to develop on summits of Mauna Kea and Mauna Loa today. Storm total snow accumulations of 6 to 12 inches are expected.

“Roads to the summits are expected to become snow covered and slippery, resulting in difficult travel conditions,” forecasters wrote. “Significant reductions in visibility are also expected, with visibilities near zero at times. Strengthening winds may also result in blowing and drifting snow.”

Below the summits, rapidly rising water levels may occur on area streams and significant flooding may occur in low lying and poor drainage areas.

According to forecasters:

The remnants of an old front lingering across the state in combination with an upper level trough moving overhead, will bring the threat for heavy rainfall and flash flooding. The heaviest rainfall is expected to fall from Oahu eastward to the Big Island, particularly in windward areas. Even though widespread heavy rainfall is not expected on Kauai, given the high levels of saturation from recent rainfall, any additional moderate rain falling for an extended period of time could quickly result in flooding problems.