A foot or more of snow is forecast for Big Island summits while flooding could be possible for lower elevations through Monday, the National Weather Service said Thursday.
A cold front is forecast to move over the islands from the northwest today, initially bringing a relatively short period of heavy rainfall to Kauai and Oahu. The front is expected to stall near Maui County and the Big Island this evening, bringing the potential for an extended period of heavy rainfall as a slow-moving kona low forms west of Kauai on Saturday, forecasters with the National Weather Service said.
As the low develops, moisture associated with the front will spread back toward the west, bringing the threat of heavy rainfall to all islands, forecasters said. This threat likely persisting well into next week.
A blizzard warning goes into effect at 6 p.m. Friday for the Maunakea and Mauna Loa summits through 6 a.m. Sunday. Twelve inches of snow — and possibly more — are forecast to fall during that period. Winds could top 100 mph atop the island’s tallest mountains with a high wind warning issued for areas over 8,000 feet.
At press-time Thursday, the Maunakea Access Road was reported closed by rangers above the Visitor Information Station at the 9,200-foot level.
Meanwhile, a flash flood watch is currently in effect for the entire state through Monday. Widespread heavy rainfall, isolated thunderstorms and damaging winds are forecast, as wet weather conditions continue for Hawaii Island through next week.
Thunder could be heard in downtown Hilo late Thursday afternoon.
The flash flood watch means conditions are favorable for flash flooding, and the following public reminders were issued:
• All residents in flood-prone areas are asked to remain alert for flooding conditions and to take this time to address any flooding concerns.
• Be aware that road closures may occur without notice.
• Do not attempt to cross flowing water.
• Be on the alert for malfunctioning traffic signals. Please treat flashing traffic lights as a four-way stop.
• Heavy rainfall and ponding can cause poor visibility and hazardous driving conditions.
• If lightning threatens your area, the safest place to be is indoors.