Heavy Rainfall and Flash Flood Threats From the Lower Mississippi Valley Into Ohio/Tennessee Valleys; Elevated to Critical Fire Concerns Out West

Heavy to excessive rainfall with flash flood concerns will be possible from the Lower Mississippi Valley into parts of the Ohio/Tennessee Valleys. Elevated to Critical Fire weather threats will persist across the Great Basin and central Rockies. Finally, Major to Record river flooding will continue in portions of the Midwest and across parts of North and South Carolina.
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Hazardous Weather Conditions

Last Update: 1021 PM EDT Sat Sep 22 2018

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Key West, FL Local Forecast Office

23NM N Smith Shoal Light FL

Marine Zone Forecast


Synopsis: A ridge axis will extend west-southwest into the southeastern United States overnight through Tuesday. Meanwhile, an area of low pressure will rotate clockwise in the northwestern Atlantic, lifting northeast along the Eastern Seaboard late Tuesday. Light to gentle east to southeast breezes will prevail across the Florida Keys through much of the forecast period, strengthening a bit mid week.

The Approximate Shoreward Edge of the Gulf Stream as of September 20, 2018...

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
East to southeast winds near 10 knots. Seas 1 to 2 feet. Scattered showers and thunderstorms.
Sunday And Sunday Night
East to southeast winds near 10 knots. Seas 1 to 2 feet. Scattered showers and thunderstorms.
Sunday Night
East to southeast winds 5 to 10 knots. Seas 1 to 2 feet. Scattered showers and thunderstorms.
Monday And Monday Night
East to southeast winds near 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms.
Tuesday
East to southeast winds near 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms.
Tuesday Night Through Thursday Night
East to southeast winds 10 to 15 knots. Seas 1 to 3 feet. Scattered showers and isolated thunderstorms.
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ABOUT THIS FORECAST

Last Update: 1021 PM EDT Sat Sep 22 2018
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