Area Forecast Discussion
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FXUS62 KKEY 250118

Area Forecast Discussion
National Weather Service Key West FL
918 PM EDT Mon Jul 24 2017

KBYX detects no precipitation echoes in the forecast area. Skies
over the island chain are partly cloudy. Winds over land are east
to southeast at 5 to 10 mph. C-MAN winds, on average, are east to
southeast near 10 knots. Temperatures are in the mid 80s.

.SHORT TERM (Overnight)...
In the low to mid levels of the atmosphere, an Atlantic ridge of
high pressure will extend across south central Florida overnight.
In the upper levels of the atmosphere, a ridge of high pressure
will be located over the Bahamas tonight. The 00z KKEY sounding is
very unstable and seasonably moist, with a precipitable water
(PWAT) value just above one and three quarters of an inch.
Atmospheric moisture will increase overnight. By sunrise Tuesday,
PWAT values will be just below two inches, which is near the 75th
percentile for this time of year. Ample atmospheric instability
and moisture in place, coupled with lack of apparent convective
inhibition, will be responsible for scattered showers and isolated
thunderstorms developing overnight.


Gentle east to southeast breezes will prevail on all Keys coastal
waters overnight. No advisories or cautionary headlines expected
tonight through at least Saturday night.


VFR conditions will persist until at least midnight at both the
Key West and Marathon International terminals. Ample tropical
moisture and converging outflow boundaries from convection over
Cuba and Andros Island are the likely culprits for sub-VFR
conditions late tonight. Expect east to southeast winds, with an
episode of showers and thunderstorms, between 25/09z and 25/15z.
Additional showers and thunderstorms are possible after 25/21z.


On this date in Florida Keys weather history, in 1921, the low
temperature in Key West was 70 degrees. This set the daily record
for minimum temperature measured in Key West on July 24th, a
record which still stands 96 years later. Temperature records at
Key West date back to 1872.





Data Collection......Vickery

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