Severe Thunderstorms Possible for the Great Lakes into Ohio Valley; Heavy to Excessive Rainfall Over the Southern Plains

Severe thunderstorms will race along a cold front from the Upper Mississippi Valley into the Great Lakes and Ohio Valley with the main threat being damaging winds. The tail end of this front will possibly produce heavy to excessive rainfall across the southern Plains into the Lower Mississippi Valley through Saturday. Finally, Major-to-record river flooding continues across the Carolinas.
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Hazardous Weather Conditions

Last Update: 1031 PM EDT Thu Sep 20 2018

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Key West, FL Local Forecast Office

Florida Bay FL

Marine Zone Forecast


Synopsis: A ridge axis will extend west-southwest into the southeastern United States tonight through Tuesday. Meanwhile, an area of low pressure will rotate clockwise around Bermuda, lifting northeast along the Eastern Seaboard Tuesday and Tuesday night. Moderate east to southeast breezes will prevail across the Florida Keys through much of the forecast period.

The Approximate Shoreward Edge of the Gulf Stream as of September 20...

17 NM South of Dry Tortugas Light...on Loggerhead Key. 9 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 11 NM South of Sand Key Light...off Key West. 14 NM South of Looe Key...off Big Pine Key. 16 NM South of Sombrero Key Light...off Marathon. 11 NM Southeast of Alligator Reef Light...off Islamorada. 8 NM Southeast of Molasses Reef Light...off Key Largo. 4 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

Overnight
Northeast to east winds 5 to 10 knots. Bay waters smooth to a light chop. Scattered showers and isolated thunderstorms.
Friday Through Sunday
East winds near 10 knots. Bay waters a light chop. Scattered showers and isolated thunderstorms.
Sunday Night
East winds near 10 knots. Bay waters a light chop. Scattered showers and isolated thunderstorms.
Monday Through Tuesday
East to southeast winds near 10 knots. bay waters a light chop. Scattered showers and isolated thunderstorms.
Tuesday Night
East to southeast winds 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers and isolated thunderstorms.
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ABOUT THIS FORECAST

Last Update: 1031 PM EDT Thu Sep 20 2018
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