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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Hazardous Weather Conditions

Last Update: 1003 AM EDT Mon Sep 20 2021

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Miami - South Florida Local Forecast Office

11NM W Marco Island FL

Marine Zone Forecast


Synopsis: South Florida remains on the periphery of weak surface high pressure. Scattered showers and thunderstorms will be possible from time to time over all local waters over the coming days. Winds and waves could be locally higher in and around any shower or thunderstorm.

.GULF STREAM HAZARDS...None.

The approximate location of the west wall of the Gulf Stream as of Sep 18, 2021 at 1200 UTC...

9 nautical miles southeast of Fowey Rocks. 13 nautical miles southeast of Port Everglades. 12 nautical miles east of Lake Worth. 14 nautical miles east of Jupiter Inlet.

This data courtesy of the Naval Oceanographic Office.

Rest Of Today
Nearshore, east southeast winds 5 knots in the morning. Winds north northwest. Offshore, east northeast winds 5 knots in the morning. Seas less than 2 feet. Period 5 seconds. Bay and inland waters a light chop. Chance of showers and thunderstorms in the morning, then showers and thunderstorms likely.
Tonight
East northeast winds 5 to 10 knots. Seas less than 2 feet. Period 2 seconds. Bay and inland waters a light chop. Chance of showers and thunderstorms through the night.
Tuesday
East northeast winds 5 to 10 knots. Seas less than 2 feet. Period 3 seconds. Bay and inland waters a light chop. Showers likely in the morning. Thunderstorms likely through the day. Showers.
Tuesday Night
East northeast winds 5 to 10 knots. Seas less than 2 feet. Period 2 seconds. Bay and inland waters a light chop. Showers likely late in the evening. Chance of thunderstorms through the night. Chance of showers after midnight.
Wednesday
East winds around 5 knots becoming south southeast in the afternoon, then becoming west southwest becoming northwest in the evening. Seas less than 2 feet. Bay and inland waters smooth. Chance of thunderstorms in the morning. Showers likely. Thunderstorms likely.
Wednesday Night
North winds around 5 knots becoming east after midnight. Seas less than 1 foot. Bay and inland waters smooth. Chance of showers and thunderstorms.
Thursday
South southeast winds around 5 knots becoming west southwest in the afternoon. Seas less than 2 feet. Bay and inland waters smooth. Chance of showers and thunderstorms in the morning, then showers and thunderstorms likely.
Thursday Night
North northwest winds around 5 knots becoming east after midnight. Seas around 2 feet. Bay and inland waters smooth. Chance of thunderstorms late in the evening. Chance of showers through the night. Slight chance of thunderstorms after midnight.
Friday
East southeast winds around 5 knots becoming south southwest in the afternoon, then becoming west in the evening. Seas around 2 feet. Bay and inland waters smooth. Chance of showers and thunderstorms in the morning, then showers and thunderstorms likely.
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ABOUT THIS FORECAST

Last Update: 1003 AM EDT Mon Sep 20 2021
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