Heavy snow and hazardous travel for portions of the Great Lakes, Northeast, and New England

Heavy snow, bitterly cold temperatures, and treacherous travel will be likely from the Great Lakes to the Northeast, and into New England over the next couple of days. Heavy Lake Effect snow of one to two feet will impact areas downwind of Lake Eerie and Ontario. Widespread snowfall of 6 to 12 inches will also impact much of northern New England.

Last Update: 418 PM EST Tue Dec 12 2017

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Key West, FL Local Forecast Office

23NM N Smith Shoal Light FL

Marine Zone Forecast

Synopsis: A cold front will sweep across Florida Keys coastal waters this evening, accompanied by a short-lived wind surge. An area of high pressure will move eastward across the Gulf of Mexico on Wednesday, and weaken over the Florida Peninsula Wednesday night and Thursday. Another high pressure system will intensify and advance eastward across the southeastern United States and western North Atlantic, from Friday through Sunday.

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.

Northwest winds near 20 knots, becoming northwest to north overnight. Seas building to 4 to 7 feet. Isolated showers this evening.
North to northeast winds 15 to 20 knots early, decreasing to 10 to 15 knots in the afternoon. Seas 4 to 6 feet early, subsiding to 3 to 5 feet.
Wednesday Night
North winds near 10 knots, becoming variable 5 to 10 knots. Seas subsiding to 2 to 3 feet.
Variable winds 5 to 10 knots. Seas 1 to 2 feet.
Thursday Night
Southeast winds near 5 knots. Seas 1 to 2 feet.
East winds near 5 knots. Seas around 1 foot.
Friday Night
Northeast winds increasing to 10 to 15 knots. seas building to 2 to 3 feet.
East winds increasing to 15 to 20 knots. Seas building to 3 to 5 feet. Isolated showers.
Saturday Night
East winds 15 to 20 knots. Seas 3 to 5 feet. Isolated showers.
Sunday And Sunday Night
East to southeast winds 15 to 20 knots. Seas 3 to 5 feet. Isolated showers.
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Last Update: 418 PM EST Tue Dec 12 2017
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