Heavy rain threat continues through Saturday from the Ohio Valley to the Mid-Atlantic and the Northeast. Scattered showers and thunderstorms will be possible over the Southwest and Rockies.

Widespread showers and thunderstorms will continue over much of the Mid-Atlantic, Northeast and the Ohio valley through the weekend. The central Appalachians and the lower Great Lakes/Ohio valley will likely have the higher rainfall amounts. Showers and thunderstorms will be possible this weekend as well from the desert southwest/southern Rockies northward to the northern Rockies and High Plains.
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Last Update: 430 PM EDT FRI SEP 30 2016

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Key West, FL Local Forecast Office

3NM NNE Florida Bay 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 WEAK PRESSURE PATTERN WILL PERSIST ACROSS THE FLORIDA KEYS AND SURROUNDING COASTAL WATERS TONIGHT. BREEZES WILL FRESHEN SATURDAY THROUGH MONDAY...WITH GENTLE TO MODERATE BREEZES ON ALL WATERS. HURRICANE MATTHEW...PRESENTLY IN THE SOUTH CENTRAL CARIBBEAN SEA...WILL TRACK ACROSS THE NORTHERN BAHAMAS TUESDAY AND EAST OF THE FLORIDA PENINSULA WEDNESDAY. AS A RESULT...HAZARDOUS SEAS AND GUSTY WINDS WILL AFFECT MAINLY THE EASTERN PORTIONS OF THE FLORIDA KEYS COASTAL WATERS...AND IT REMAINS TOO SOON TO RULE OUT ANY ADDITIONAL IMPACTS FROM MATTHEW.

THE APPROXIMATE SHOREWARD EDGE OF THE GULF STREAM CURRENT...AS OF SEPTEMBER 30...

18 NM SOUTH OF DRY TORTUGAS LIGHT...ON LOGGERHEAD KEY. 11 NM SOUTH OF COSGROVE SHOAL LIGHT...OFF THE MARQUESAS KEYS. 11 NM SOUTH OF SAND KEY LIGHT...OFF KEY WEST. 10 NM SOUTH OF LOOE KEY...OFF BIG PINE KEY. 5 NM SOUTH OF SOMBRERO KEY LIGHT...OFF MARATHON. 2 NM SOUTHEAST OF ALLIGATOR REEF LIGHT...OFF ISLAMORADA. 3 NM SOUTHEAST OF MOLASSES REEF LIGHT...OFF KEY LARGO. 8 NM EAST OF CARYSFORT REEF LIGHT...OFF OCEAN REEF.

GULF STREAM INFORMATION BASED ON THE NAVAL OCEANOGRAPHIC OFFICE.

Tonight
Northeast to east winds 5 to 10 knots. Bay waters smooth to a light chop. Scattered showers and thunderstorms.
Saturday Through Sunday Night
Northeast to east winds 10 to 15 knots. Bay waters a light to moderate chop. Scattered showers and thunderstorms.
Monday
Northeast to east winds near 15 knots. Bay waters a moderate chop. Scattered showers and thunderstorms.
Monday Night
North to northeast winds 15 to 20 knots. Bay waters choppy. Scattered showers and thunderstorms.
Tuesday
North to northeast winds near 20 knots. Bay waters rough. Scattered showers and thunderstorms.
Tuesday Night And Wednesday
Northwest to north winds near 20 knots. Bay waters rough. Scattered showers and thunderstorms.
Wednesday Night
Northwest to north winds near 15 knots. Bay waters a moderate chop. Scattered showers and isolated thunderstorms.
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ABOUT THIS FORECAST

Last Update: 430 PM EDT FRI SEP 30 2016
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