Excessive Heat Continues today for Portions of Central and Eastern U.S.; Change in Weather Pattern this Week

Dangerous heat and humidity continues today from portions of the Plains to the East Coast. A cold front will bring lower temperatures, and potential for strong to severe thunderstorms with damaging winds and heavy rain that could produce flash flooding to the Central and Eastern U.S. through early this week. High pressure shifts West this week with building heat and monsoonal moisture.
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Last Update: 437 PM EDT Sun Jul 21 2019

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Key West, FL Local Forecast Office

5NM E Vaca Cut FL

Marine Zone Forecast


Synopsis: High pressure will extend west across the Florida Peninsula this evening and overnight, with gentle to moderate easterly breezes continuing across the Keys waters. A trough is forecast to approach Florida, moving over the peninsula Monday night and Tuesday. Breezes over Keys waters will weaken and veer south. Light winds are expected Tuesday through Thursday, as the surface ridge remains near the Keys.

The Approximate Shoreward Edge of the Gulf Stream as of July 20...

9 NM South of Dry Tortugas Light...on Loggerhead Key. 10 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 9 NM South of Sand Key Light...off Key West. 12 NM South of Looe Key...off Big Pine Key. 13 NM South of Sombrero Key Light...off Marathon. 7 NM Southeast of Alligator Reef Light...off Islamorada. 4 NM Southeast of Molasses Reef Light...off Key Largo. 3 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

Tonight
East to southeast winds near 10 knots. Seas 1 to 2 feet. Nearshore waters a light chop. Scattered showers and thunderstorms.
Monday And Monday Night
East winds 5 to 10 knots. Seas 1 to 2 feet. Nearshore waters smooth to a light chop. Scattered showers and thunderstorms.
Tuesday
East to southeast winds 5 to 10 knots, becoming southwest late. Seas around 1 foot. Nearshore waters smooth to a light chop. Scattered showers and thunderstorms.
Tuesday Night And Wednesday
Southwest winds 5 to 10 knots. seas around 1 foot. Nearshore waters smooth to a light chop. scattered showers and isolated thunderstorms.
Wednesday Night And Thursday
South to southwest winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. Scattered showers and isolated thunderstorms.
Thursday Night
East winds near 5 knots. Seas 1 foot or less. Nearshore waters smooth. Isolated showers and thunderstorms.
Friday
East winds 5 to 10 knots. Seas around 1 foot. Nearshore waters smooth to a light chop. Isolated showers and thunderstorms.
Friday Night
East winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers and thunderstorms.
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Last Update: 437 PM EDT Sun Jul 21 2019
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