Flash Flood Watches in Southeast and Tennessee Valley; Critical Fire Weather in California; Severe Weather in Upper Midwest

Flash flood watches are in effect today in parts of the Southeast and Tennessee Valley from organized areas of heavy to excessive rainfall. Meanwhile, critical fire weather conditions are likely across northern California with offshore winds and dry conditions. Finally, a strong cold front will produce severe thunderstorms across the Upper to Mid Mississippi Valley.
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Last Update: 1026 AM EDT Mon Sep 20 2021

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Key West, FL Local Forecast Office

3NM SE Key Largo FL

Marine Zone Forecast


Synopsis: A broad high pressure over the eastern third of the United States will result in light to gentle northeast to east breezes peaking and lulling through Wednesday, with peaks generally in the late overnight and early morning hours. A mid- latitude longwave trough will approach the Florida Peninsula by mid to late week, resulting in a return to light and variable breezes. Rain and thunder chances will remain elevated through Friday.

The Approximate Shoreward Edge of the Gulf Stream as of September 18...

49 NM South of Dry Tortugas Light...on Loggerhead Key. 29 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 37 NM South of Sand Key Light...off Key West. 45 NM South of Looe Key...off Big Pine Key. 39 NM South of Sombrero Key Light...off Marathon. 26 NM Southeast of Alligator Reef Light...off Islamorada. 17 NM Southeast of Molasses Reef Light...off Key Largo. 7 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

This Afternoon
Northeast to east winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. Scattered showers and isolated thunderstorms.
Tonight
Northeast to east winds increasing to 10 to 15 knots. seas building to around 2 feet. Nearshore waters becoming a light to moderate chop. Scattered showers and isolated thunderstorms.
Tuesday
Northeast to east winds near 10 knots. Seas subsiding to 1 to 2 feet. Nearshore waters a light chop. Scattered showers and isolated thunderstorms in the morning, then numerous showers and isolated thunderstorms in the afternoon.
Tuesday Night
Northeast to east winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Numerous showers and isolated thunderstorms in the evening, then scattered showers and isolated thunderstorms after midnight.
Wednesday
East winds 5 to 10 knots, becoming variable. Seas around 1 foot. Nearshore waters smooth to a light chop. Scattered showers and isolated thunderstorms.
Wednesday Night
Variable winds near 5 knots, becoming east to southeast. Seas 1 foot or less. Nearshore waters smooth. scattered showers and isolated thunderstorms.
Thursday
Southeast to south winds near 5 knots, becoming variable. Seas 1 foot or less. Nearshore waters smooth. Scattered showers and isolated thunderstorms.
Thursday Night
Variable winds near 5 knots, becoming southeast. Seas 1 foot or less. Nearshore waters smooth. Scattered showers and isolated thunderstorms.
Friday And Friday Night
Southeast to south winds near 5 knots. Seas 1 foot or less. Nearshore waters smooth. Scattered showers and isolated thunderstorms.
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ABOUT THIS FORECAST

Last Update: 1026 AM EDT Mon Sep 20 2021
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