Strong to Severe Thunderstorms, Heavy Rain, And Flash Flooding Across the Midwest

Strong to severe thunderstorms, heavy rain and flooding is possible from the Great Lakes to the south-central Plains, as a strong cold front pushes into the extended area. Meanwhile, well above average temperatures are very likely across the Northeastern quad of the country, including the Northeast, Mid-Atlantic, Great Lakes and Ohio Valley.
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Last Update: 1026 AM EDT Sun Sep 22 2019

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Key West, FL Local Forecast Office

5NM E Vaca Cut FL

Marine Zone Forecast


...SMALL CRAFT ADVISORY IN EFFECT...
Synopsis: Strong northeast to east breezes will continue across the Florida Keys coastal waters this afternoon, between high pressure over the Southeast United States and lower pressure over the western Caribbean. The high pressure will gradually weaken tonight through Tuesday, allowing easterly breezes to slowly diminish. Gentle to moderate east breezes will prevail from Tuesday night through Thursday night, as weak high pressure lingers over the Florida peninsula.

The Approximate Shoreward Edge of the Gulf Stream as of September 21...

55 NM South of Dry Tortugas Light...on Loggerhead Key. 33 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 27 NM South of Sand Key Light...off Key West. 21 NM South of Looe Key...off Big Pine Key. 18 NM South of Sombrero Key Light...off Marathon. 21 NM Southeast of Alligator Reef Light...off Islamorada. 20 NM Southeast of Molasses Reef Light...off Key Largo. 13 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

This Afternoon
Northeast to east winds 25 to 30 knots, decreasing to near 25 knots. Seas 3 to 6 feet. Nearshore waters extremely rough. Numerous showers and isolated thunderstorms.
Tonight
Northeast to east winds 20 to 25 knots. Seas 3 to 5 feet. Nearshore waters very rough. Numerous showers and isolated thunderstorms.
Monday
Northeast winds near 20 knots. Seas 2 to 4 feet. nearshore waters rough. Scattered showers and isolated thunderstorms.
Monday Night
Northeast winds near 20 knots in the evening, decreasing to near 15 knots after midnight. Seas 2 to 4 feet. Nearshore waters rough, becoming a moderate chop. Scattered showers and isolated thunderstorms.
Tuesday
Northeast winds 10 to 15 knots. Seas 1 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers.
Tuesday Night
Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers.
Wednesday
Northeast to east winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Isolated showers.
Wednesday Night
East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers.
Thursday
East winds near 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light 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.
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Last Update: 1026 AM EDT Sun Sep 22 2019
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