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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Last Update: 1017 PM EST Tue Dec 12 2017

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Key West, FL Local Forecast Office

Florida Bay FL

Marine Zone Forecast


...SMALL CRAFT ADVISORY IN EFFECT...
Synopsis: A cold front will sweep across Florida Keys coastal waters late 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.

Overnight
Northwest to north winds 10 to 15 knots, increasing to near 20 knots. Bay waters a light to moderate chop, becoming rough. Isolated showers late this evening.
Wednesday
North winds 15 to 20 knots decreasing to near 10 knots late in the afternoon. Bay waters choppy.
Wednesday Night
North winds 5 to 10 knots. Bay waters smooth to a light chop.
Thursday
North winds 5 to 10 knots becoming southwest late in the afternoon. Bay waters smooth to a light chop.
Thursday Night
Variable winds near 5 knots. Bay waters smooth.
Friday
North winds 5 to 10 knots becoming west to northwest late in the afternoon. Bay waters smooth to a light chop.
Friday Night
North to northeast winds near 10 knots. Bay waters a light chop.
Saturday
Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. Isolated showers.
Saturday Night
East winds near 15 knots. Bay waters a moderate chop.
Sunday And Sunday Night
East to southeast winds 10 to 15 knots. Bay waters a light to moderate chop. Isolated showers.
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ABOUT THIS FORECAST

Last Update: 1017 PM EST Tue Dec 12 2017
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