Arctic Air Plunges into the Great Lakes, Northeast and Mid-Atlantic

Arctic air dropping through the northern and eastern U.S. and a storm off the east coast will bring periods of snow, very cold wind chills and hazardous traveling conditions from the Upper Great Lakes to the Northeast. Meanwhile in southern California, Santa Ana winds will decrease but hot, dry air will remain over the area with elevated fire weather conditions.
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Hazardous Weather Conditions

Last Update: 422 PM EST Wed Dec 13 2017

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Key West, FL Local Forecast Office

45NM SSW Rebecca Shoal Light FL

Marine Zone Forecast


Synopsis: An area of high pressure will move eastward across the Gulf of Mexico this evening, and linger over the Florida Peninsula overnight and Thursday. Another high pressure system will intensify and advance eastward across the southeastern United States and western North Atlantic Friday through Monday.

The Approximate Shoreward Edge of the Gulf Stream as of December 12, 2017,

50 NM South of Dry Tortugas Light, on Loggerhead Key. 13 NM South of Cosgrove Shoal Light, off the Marquesas Keys. 21 NM South of Sand Key Light, off Key West. 31 NM South of Looe Key, off Big Pine Key. 36 NM South of Sombrero Key Light, off Marathon. 15 NM Southeast of Alligator Reef Light, off Islamorada. 10 NM Southeast of Molasses Reef Light, off Key Largo. 2 NM East of Carysfort Reef Light, off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

Tonight
North to northeast winds 5 to 10 knots. Seas 3 to 5 feet due to lingering northwest to northerly swells. Seas subsiding to 2 to 4 feet.
Thursday
Northeast winds near 5 knots. Seas 1 to 3 feet due to northwest to north swells.
Thursday Night
East winds 5 to 10 knots. Seas 1 to 2 feet.
Friday
Northeast to east winds 5 to 10 knots. Seas 1 to 2 feet.
Friday Night
Northeast winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers.
Saturday
Northeast to east winds near 15 knots. Seas 3 to 5 feet. Isolated showers.
Saturday Night
East winds 15 to 20 knots. Seas 4 to 6 feet. Isolated showers.
Sunday
East to southeast winds 15 to 20 knots. Seas 4 to 6 feet. Isolated showers.
Sunday Night
East to southeast winds 15 to 20 knots. Seas 4 to 6 feet. Isolated showers.
Monday
Southeast winds near 15 knots. Seas 3 to 5 feet. isolated showers.
Monday Night
East winds 10 to 15 knots. Seas 2 to 4 feet. isolated showers.
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ABOUT THIS FORECAST

Last Update: 422 PM EST Wed Dec 13 2017
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