Area Forecast Discussion
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FXUS62 KKEY 180209

Area Forecast Discussion
National Weather Service Key West FL
909 PM EST Fri Nov 17 2017

KBYX detects isolated showers over nearshore and offshore waters
surrounding the Lower Keys. Elsewhere, KBYX detects no
precipitation echoes in the remainder of the forecast area. Skies
over the island chain are partly cloudy. Winds over land are
northeast to east at 10 to 15 mph. C-MAN winds, on average, are
northeast to east near 15 knots, with gusts near 20 knots.
Temperatures are in the mid 70s.

.SHORT TERM (Overnight)...
In the low levels of the atmosphere, an area of high pressure will
be located near the Carolina coastline overnight. In the mid
levels of the atmosphere, a ridge of high pressure will be
centered over the southeast coast of the United States tonight. In
the upper levels of the atmosphere, a trough of low pressure will
be located near the Bahamas overnight. The 00z KKEY sounding is
marginally unstable and seasonably moist, with a precipitable
water (PWAT) value just under one and one quarter of an inch.
Atmospheric moisture will decrease overnight. By sunrise Saturday,
PWAT values will be just under one inch, which is near the 25th
percentile for this time of year. The invasion of this drier air
mass will be responsible for no chance of rain for the Florida
Keys tonight.


Small craft are urged to exercise caution on the coastal waters of
the Atlantic and offshore Gulf of Mexico until winds decrease
tonight. No advisories expected overnight through at least Sunday.


VFR conditions will prevail at EYW and MTH tonight and Saturday.
Sustained northeast to east winds of 10 to 15 knots expected from
just off the surface to about 3,000 feet.


On this date in Florida Keys weather history, in 1940, the low
temperature in Key West was 56 degrees. This set the daily record
for minimum temperature measured in Key West on November 17th, a
record which still stands 77 years later. Temperature records at
Key West date back to 1872.





Data Collection......L. Kasper

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