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Area Forecast Discussion (AFD)

Issued by Key West, FL (KEY)

FXUS62 KKEY 210341

Area Forecast Discussion
National Weather Service Key West FL
1041 PM EST Tue Feb 20 2018

Under partly cloudy skies with winds ranging from fresh/strong
across the Straits to moderate across the Gulf and Bay waters,
temperatures along the island chain are in the middle 70s. There
have been very small and weak echoes on KBYX Doppler radar in the
Straits this evening, but they have been very brief.

The late evening local sounding showed the persistence of the
veered profile. But, moisture in the lowest layers has diminished
noticeably in the last twelve hours. There may be brief, small,
very weak echoes over the Straits overnight, but not worth a
mention. Winds should remain elevated and gusty over the
southeastern half of the service area. The afternoon zone issuance
has the expected conditions advertised well through the overnight
period. No update is planned. 


Mixing is still significantly more over the southeastern half of
the service area this evening. There were no changes on the
recently updated coastal waters forecast, with an advisory for
small craft over the Straits of Florida and for Hawk Channel.
Small craft should exercise caution in Florida Bay and the Gulf 
waters adjacent to the Middle and Lower Keys. Do not expect much
change in the local pressure pattern for the next several days. 


VFR will prevail at both KEYW and KMTH terminals. Some uncertainty 
for overnight VFR ceilings. Should they occur after midnight, 
expect them around FL040. East-southeast winds sustained near 15 
knots, with occasional gusts near 25 knots until midnight. Gusty 
winds pick up again in the morning as winds at FL010 remain near 
30 knots. 


On this date in Keys weather history, in 2015, a low temperature 
of 49 degrees was recorded in Key West. This set the daily record 
for coldest temperature for February 20th. Temperature records 
for Key West date back to 1872. 


GM...Small Craft Advisory for GMZ042>044-052>055-072>075.



Data Collection......Chesser

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