Severe Thunderstorms Possible from the Central Plains to the Ohio Valley

Severe thunderstorms containing damaging winds, large to very large hail, heavy rainfall, and isolated tornadoes will be possible Thursday from the Central Plains into the Great Lakes. The primary threat is expected to move into the Great Lakes on Friday. Heavy rainfall with these thunderstorms could cause localized flooding.
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Hazardous Weather Conditions

Last Update: 1038 PM EDT Wed Jun 28 2017

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Key West, FL Local Forecast Office

12NM N Vaca Cut FL

Marine Zone Forecast


Synopsis: A weak surface ridge will extend to the Bahamas overnight. A ridge of high pressure will exit the eastern United States and strengthen somewhat for the balance of this week and into this weekend.

The Approximate Shoreward Edge of the Gulf Stream as of June 27, 2017...

60 NM South of Dry Tortugas Light, on Loggerhead Key. 38 NM South of Cosgrove Shoal Light, off the Marquesas Keys. 30 NM South of Sand Key Light, off Key West. 22 NM South of Looe Key, off Big Pine Key. 20 NM South of Sombrero Key Light, off Marathon. 14 NM Southeast of Alligator Reef Light, off Islamorada. 10 NM Southeast of Molasses Reef Light, off Key Largo. 8 NM East of Carysfort Reef Light, off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

Overnight
Variable winds 5 to 10 knots, becoming east to southeast. Seas 1 foot or less. Nearshore waters smooth to a light chop. Scattered showers and isolated thunderstorms developing.
Thursday
East to southeast winds 5 to 10 knots. Seas 1 foot or less. Nearshore waters smooth to a light chop. Scattered showers and isolated thunderstorms.
Thursday Night
East winds increasing to 10 to 15 knots. Seas building to 1 to 2 feet. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms.
Friday
East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Scattered showers and isolated thunderstorms.
Friday Night
East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers and thunderstorms.
Saturday
East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers and thunderstorms.
Saturday Night
East to southeast winds 10 to 15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate chop. Isolated showers and thunderstorms.
Sunday Through Monday Night
East to southeast winds near 10 knots. Seas around 1 foot. Nearshore waters a light chop. scattered showers and isolated thunderstorms.
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ABOUT THIS FORECAST

Last Update: 1038 PM EDT Wed Jun 28 2017
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