Severe Thunderstorm Threat Increasing This Week from the High Plains to Gulf Coast

A storm system will move from the Rockies to the East Coast during the next several days bringing a severe thunderstorm threat to many parts of the nation. On Thursday, large hail will be the main threat in the High Plains. By Friday a more widespread threat will develop in the ArkLaTex region where damaging winds, very large hail and tornadoes will be possible.
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Last Update: 1031 PM EDT WED MAR 22 2017

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Key West, FL Local Forecast Office

6NM NW Cosgrove Shoal Light FL

Marine Zone Forecast

SEAS ARE GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES. INDIVIDUAL WAVES MAY BE MORE THAN TWICE THE SIGNIFICANT WAVE HEIGHT.

Synopsis: A TROUGH OF LOW PRESSURE WILL PROGRESS SOUTHWARD DOWN THE FLORIDA PENINSULA TONIGHT AND THURSDAY. THIS TROUGH OF LOW PRESSURE SHOULD PASS THROUGH THE FLORIDA KEYS THURSDAY NIGHT. AN ATLANTIC RIDGE OF HIGH PRESSURE WILL EXTEND ACROSS THE SOUTHEASTERN UNITED STATES AND PRESS SOUTHWARD FRIDAY THROUGH THIS WEEKEND.

THE APPROXIMATE SHOREWARD EDGE OF THE GULF STREAM CURRENT...AS OF MARCH TWENTY-FIRST...

42 NM SOUTH OF DRY TORTUGAS LIGHT...ON LOGGERHEAD KEY. 26 NM SOUTH OF COSGROVE SHOAL LIGHT...OFF THE MARQUESAS KEYS. 21 NM SOUTH OF SAND KEY LIGHT...OFF KEY WEST. 21 NM SOUTH OF LOOE KEY...OFF BIG PINE KEY. 20 NM SOUTH OF SOMBRERO KEY LIGHT...OFF MARATHON. 12 NM SOUTHEAST OF ALLIGATOR REEF LIGHT...OFF ISLAMORADA. 11 NM SOUTHEAST OF MOLASSES REEF LIGHT...OFF KEY LARGO. 9 NM EAST OF CARYSFORT REEF LIGHT...OFF OCEAN REEF.

GULF STREAM INFORMATION COURTESY OF THE NAVAL OCEANOGRAPHIC OFFICE.

Overnight
Mostly north winds near 10 knots. Seas 1 to 2 feet. nearshore waters a light chop.
Thursday
North winds near 10 knots...becoming northeast and increasing to 15 to 20 knots in the afternoon. Seas 1 to 2 feet...building to 2 to 4 feet. Nearshore waters a light chop...becoming choppy. Scattered showers and isolated thunderstorms in the afternoon.
Thursday Night
Northeast to east winds near 20 knots...increasing to 20 to 25 knots by midnight. Seas 3 to 5 feet. Nearshore waters rough...becoming very rough. Scattered showers and isolated thunderstorms.
Friday
Northeast to east winds 20 to 25 knots. Seas 4 to 5 feet. Nearshore waters very rough. Scattered showers.
Friday Night
East winds near 20 knots. Seas 3 to 5 feet. Nearshore waters rough. Scattered showers.
Saturday
East winds 15 to 20 knots. Seas 3 to 4 feet. Nearshore waters choppy. Isolated showers.
Saturday Night Through Monday
East winds near 15 knots. Seas 2 to 4 feet. Nearshore waters a moderate chop. Isolated showers.
Monday Night
East winds 10 to 15 knots. Seas around 2 feet. Nearshore waters a light to moderate chop.
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ABOUT THIS FORECAST

Last Update: 1031 PM EDT WED MAR 22 2017
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