Heavy Rains Expected to Impact Parts of the Eastern U.S.

A strong cold front will produce heavy rain will create mainly localized areas of flash flooding to the Great Lakes and Ohio Valley. There is another flash flood threat in the parts of the Southeast and Southern Appalachians.
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Last Update: 333 AM EDT Tue Sep 21 2021

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Jacksonville, FL Local Forecast Office

6NM NE Mayport FL

Marine Zone Forecast

Synopsis: High pressure centered over the Canadian Maritimes will shift east today as a cold front approaches the eastern coast. The cold front will move across the local waters Wednesday night. High pressure will build into the area Thursday into the weekend.

.GULF STREAM...

The approximate location of the west wall of the Gulf Stream as of Sep 21, 2021 at 1200 UTC...

52 nautical miles east of Flagler Beach. 66 nautical miles east of Saint Augustine Beach. 75 nautical miles east of Jacksonville Beach. 87 nautical miles east of St Simons Island.

This data courtesy of the Naval Oceanographic Office.

Today

Southwest winds 5 to 10 knots becoming southeast 10 to 15 knots in the afternoon. Seas 3 to 4 feet with a dominant period 7 seconds. A moderate chop on the intracoastal waters. Chance of showers and thunderstorms.

Tonight

South winds 10 to 15 knots becoming southwest 5 to 10 knots after midnight. Seas 3 to 4 feet with a dominant period 7 seconds. A light chop on the intracoastal waters. Slight chance of thunderstorms in the evening. Chance of showers.

Wednesday

South winds 5 to 10 knots. Seas 2 to 3 feet with a dominant period 7 seconds. A light chop on the intracoastal waters. Chance of showers and slight chance of thunderstorms.

Wednesday Night

Southwest winds 5 to 10 knots becoming northwest 10 to 15 knots after midnight. Seas 3 to 4 feet. A light chop on the intracoastal waters. Chance of showers and slight chance of thunderstorms.

Thursday

North winds 10 to 15 knots. Seas 3 to 4 feet. A moderate chop on the intracoastal waters. Slight chance of showers.

Thursday Night

North winds 10 knots. Seas 3 to 4 feet. Slight chance of showers.

Friday

Northeast winds 10 knots. Seas 3 to 4 feet. Slight chance of showers.

Friday Night

Northeast winds 5 to 10 knots. Seas 3 to 4 feet. Slight chance of showers.

Saturday

Northeast winds 5 to 10 knots. Seas 3 to 4 feet. Slight chance of showers.