Enhanced Risk for Severe Thunderstorms Across the Upper Midwest; Flash Flooding Possible from the Upper Midwest to Southern Plains and Desert Southwest Through Friday

Portions of the Upper Midwest will see an increased threat for severe thunderstorms through this evening, with a few strong tornadoes possible. The same region remains on alert for additional flash flood concerns. Heavy rainfall may lead to flash flooding across the Desert Southwest today, and Southern Plains by Friday. Finally, Major-to-record river flooding continues across the Carolinas.
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Hazardous Weather Conditions

Last Update: 426 PM EDT Thu Sep 20 2018

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Key West, FL Local Forecast Office

12NM SSW Tennessee Reef Light FL

Marine Zone Forecast


Synopsis: A ridge axis will extend west across the Florida Peninsula today through Monday. Meanwhile, a weak tropical wave will develop and move westward across Cuba and the Florida Keys Friday night through early Sunday.

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.

Tonight
East winds 5 to 10 knots, increasing to near 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms.
Friday
East winds near 10 knots. Seas 1 to 2 feet. Scattered showers and isolated thunderstorms.
Friday Night
East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated thunderstorms.
Saturday
East winds 10 to 15 knots. Seas 2 to 3 feet. scattered showers and isolated thunderstorms.
Saturday Night
East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated thunderstorms.
Sunday
East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated thunderstorms.
Sunday Night
East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers and isolated thunderstorms.
Monday Through Tuesday Night
East to southeast winds 10 to 15 knots. Seas 2 to 4 feet. Scattered showers and isolated thunderstorms.
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ABOUT THIS FORECAST

Last Update: 426 PM EDT Thu Sep 20 2018
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