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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Hazardous Weather Conditions

Last Update: 416 PM EST Sun Dec 17 2017

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Key West, FL Local Forecast Office

3NM N American Shoal Light FL

Marine Zone Forecast


Synopsis: A high pressure cell will persist from the subtropical North Atlantic to the eastern Gulf of Mexico, from tonight through Friday.

The Approximate Shoreward Edge of the Gulf Stream as of December 16, 2017,

30 NM South of Dry Tortugas Light, on Loggerhead Key. 17 NM South of Cosgrove Shoal Light, off the Marquesas Keys. 26 NM South of Sand Key Light, off Key West. 32 NM South of Looe Key, off Big Pine Key. 29 NM South of Sombrero Key Light, off Marathon. 14 NM Southeast of Alligator Reef Light, off Islamorada. 9 NM Southeast of Molasses Reef Light, off Key Largo. 6 NM East of Carysfort Reef Light, off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

Tonight
East winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop.
Monday Through Tuesday
East winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop.
Tuesday Night
East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop.
Wednesday
Southeast winds near 10 knots. Seas 1 to 3 feet. nearshore waters a light chop.
Wednesday Night Through Thursday Night
East to southeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop.
Friday
East winds 10 to 15 knots. Seas 1 to 3 feet. Nearshore waters a light to moderate chop.
Friday Night
East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop.
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ABOUT THIS FORECAST

Last Update: 416 PM EST Sun Dec 17 2017
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