Hard freeze likely over the Deep South, inclement pattern expected over the west coast of the U.S. through the weekend

Very cold temperatures are likely to continue over the Deep South and Southeast U.S. into Thursday. A series of low pressure systems will bring abundant moisture to much of northern California and into the Pacific Northwest through the upcoming weekend. Locally heavy rain and strong winds will be likely along coastal locations, with heavy snow expected from Sierra to the Cascades.
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Last Update: 1033 AM EST Thu Jan 18 2018

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Key West, FL Local Forecast Office

4NM ESE Alligator Reef Light FL

Marine Zone Forecast


...SMALL CRAFT ADVISORY IN EFFECT...
Synopsis: High pressure will continue to build southeastward from the Mississippi Valley today, reaching North Florida by Friday. High pressure will intensify across the western North Atlantic Saturday and Saturday night.

The Approximate Shoreward Edge of the Gulf Stream as of January 15, 2018...

45 NM South of Dry Tortugas Light, on Loggerhead Key. 35 NM South of Cosgrove Shoal Light, off the Marquesas Keys. 30 NM South of Sand Key Light, off Key West. 28 NM South of Looe Key, off Big Pine Key. 35 NM South of Sombrero Key Light, off Marathon. 21 NM Southeast of Alligator Reef Light, off Islamorada. 17 NM Southeast of Molasses Reef Light, off Key Largo. 14 NM East of Carysfort Reef Light, off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

This Afternoon
North to northeast winds 20 to 25 knots, decreasing to near 20 knots. Seas 6 to 9 feet.
Tonight
Northeast winds 15 to 20 knots. Seas 4 to 7 feet.
Friday
Northeast winds near 15 knots. Seas 3 to 5 feet. Isolated showers.
Friday Night
Northeast to east winds 15 to 20 knots. Seas 3 to 5 feet. Isolated showers.
Saturday
Northeast to east winds near 15 knots. Seas 3 to 5 feet. Isolated showers.
Saturday Night
Northeast to east winds near 20 knots. Seas 4 to 6 feet. Scattered showers.
Sunday
East winds 15 to 20 knots. Seas 4 to 6 feet. Scattered showers.
Sunday Night
East winds 15 to 20 knots. Seas 4 to 6 feet. Isolated showers.
Monday
East winds near 15 knots. Seas 2 to 4 feet. Isolated showers.
Monday Night
East winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers.
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ABOUT THIS FORECAST

Last Update: 1033 AM EST Thu Jan 18 2018
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