Significant Snowfall for Washington Cascades and Northern Rocky Mountains

A cold front will linger for several days from the Pacific Northwest to portions of the northern Plains early this week. Cold temperatures and copious moisture will combine to produce several feet of snow into the mountain passes, with up to 4 feet of snow down to 4000 feet in the northern Rockies. Travel through mountain passes will be very difficult.
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Last Update: 350 AM HST Mon Dec 18 2017

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Honolulu, HI Local Forecast Office

19NM SW Lanai City HI

Marine Zone Forecast


Synopsis: PHZ100-190215- 350 AM HST Mon Dec 18 2017 .Synopsis for Hawaiian coastal waters... Weak low pressure over the region will lift north-northeast today as a cold front approaches. The cold front will reach the Kauai waters late Tuesday into Tuesday night, then continue down the island chain through midweek. Another cold front will approach the islands Thursday through Friday. $$

Today
Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 4 feet. Scattered showers through the day. Scattered thunderstorms in the afternoon.
Tonight
Winds variable less than 10 knots becoming north 10 knots after midnight. Wind waves 3 feet. Northwest swell 4 feet. Scattered heavy showers and thunderstorms in the evening, then heavy showers and thunderstorms likely after midnight.
Tuesday
Winds variable less than 10 knots. Wind waves 3 feet. Northwest swell 6 feet. Haze through the day. Occasional heavy showers and thunderstorms in the morning. Heavy showers and thunderstorms likely in the afternoon.
Tuesday Night
Northeast winds 10 knots. Wind waves 2 feet or less. North swell 7 feet. Haze. Heavy showers likely and slight chance of thunderstorms.
Wednesday
North winds 15 knots. Wind waves 3 feet. North swell 7 feet. Heavy showers likely and slight chance of thunderstorms.
Wednesday Night
North winds 15 knots. Wind waves 3 feet. North swell 8 feet. Scattered heavy showers and slight chance of thunderstorms.
Thursday
North winds 15 knots. Wind waves 3 feet. North swell 5 to 7 feet. Isolated showers.
Friday
North winds 10 knots. Wind waves 2 feet or less. North swell 4 to 5 feet. Isolated showers.
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Last Update: 350 AM HST Mon Dec 18 2017
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