Areas Of Locally Heavy Snow And Rain Today

A strong low pressure system over the Great Lakes will produce locally heavy snow and rain, before reaching eastern Canada by tomorrow morning. Heavy snow is expected across the Upper Mississippi Valley and Great Lakes with the arrival of an Arctic air mass, while locally heavy rain is possible along and ahead of the associated cold front over the eastern Ohio Valley and southeastern New England.
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Last Update: 444 PM EST Mon Dec 9 2019

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Key West, FL Local Forecast Office

7NM E Vaca Cut FL

Marine Zone Forecast


Synopsis: A ridge of high pressure extends from the western North Atlantic southwestward into the Florida Keys, maintaining moderate to occasionally fresh east to southeast breezes through Tuesday evening. A dying cold front over the Gulf of Mexico will erode the western flank of the ridge axis late Tuesday night through Wednesday night, allowing breezes to diminish. Another weak area of low pressure will fester over the Gulf of Mexico Thursday and Thursday night.

The Approximate Shoreward Edge of the Gulf Stream as of December 7...

52 NM South of Dry Tortugas Light...on Loggerhead Key. 41 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 38 NM South of Sand Key Light...off Key West. 24 NM South of Looe Key...off Big Pine Key. 22 NM South of Sombrero Key Light...off Marathon. 14 NM Southeast of Alligator Reef Light...off Islamorada. 7 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 to southeast winds near 15 knots. Seas 2 to 4 feet. Nearshore waters a moderate chop. Isolated showers.
Tuesday
East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers.
Tuesday Night
East to southeast winds 10 to 15 knots increasing to near 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop, becoming a moderate chop. Isolated showers.
Wednesday
East winds near 10 knots, decreasing to 5 to 10 knots. Seas 1 to 3 feet. Nearshore waters a light chop, becoming smooth to a light chop. Isolated showers.
Wednesday Night
Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers.
Thursday
Northeast to east winds near 15 knots. Seas 1 to 3 feet. Nearshore waters a moderate chop. Isolated showers.
Thursday Night
East winds 10 to 15 knots. Seas 1 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers.
Friday
East to southeast winds 10 to 15 knots. Seas 1 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers.
Friday Night
South winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers.
Saturday
Southwest to west winds 5 to 10 knots, becoming northwest. Seas around 1 foot. Nearshore waters smooth to a light chop. Scattered showers.
Saturday Night
Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Isolated showers.
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Last Update: 444 PM EST Mon Dec 9 2019
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