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Area Forecast Discussion (AFD)

Issued by Key West, FL (KEY)

FXUS62 KKEY 180237

Area Forecast Discussion
National Weather Service Key West FL
1037 PM EDT Tue Apr 17 2018

Data from the Key West evening radiosonde balloon indicated a very
dry and stable air mass. A large-scale ridge extends northward
across the Gulf of Mexico into the mid-Mississippi River Valley,
with deep northwest flow aloft over the Florida Peninsula. An
associated surface high pressure cell of continental origin is
centered over the northeastern Gulf of Mexico this evening, with
gentle to moderate northeast to east breezes prevailing over the
Keys and adjoining coastal waters. Both surface and satellite
observations show only a few shallow cumulus clouds over the Gulf
Stream, with clear skies over the Keys. Currently, air
temperatures in most Keys island communities are in the lower 70s,
with dewpoint temperatures having rebounded to the upper 50s. 

Overnight, a fair and fine weather pattern will persist, with
slightly cooler and drier conditions than average, clear skies,
and gentle breezes.

No watches, warnings, or advisories are in effect for Florida Keys
coastal waters. An area of high pressure over the eastern Gulf of
Mexico will pass eastward over central Florida overnight. An 
Atlantic ridge of high pressure will extend across the Florida 
Peninsula Wednesday. This ridge of high pressure will retreat 
eastward Wednesday night. A trough of low pressure will move 
southward across the Florida Peninsula Thursday and Thursday 

Through 18/24Z, prevailing VFR conditions are expected at both EYW
and MTH.

On this date in Florida Keys weather history, in 1983, a high 
temperature of 72 degrees was recorded at Key West International
Airport. This set the daily record for coolest high temperature
measured on April 17. Though today was cooler than climatological
normal, the temperature reached 77 degrees, so this record will 
stand another year. Temperature records at Key West date back to 



Data Collection......CLR

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