Area Forecast Discussion
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000
FXUS62 KKEY 210111
AFDKEY

Area Forecast Discussion
National Weather Service Key West FL
911 PM EDT Fri Oct 20 2017

.DISCUSSION...
.CURRENTLY...
KBYX detects widely separated showers throughout the forecast
area. Skies over the island chain are variably cloudy. Winds over
land are northeast to east near 15 mph. C-MAN winds, on average,
are northeast to east at 15 to 20 knots. Temperatures are in the
lower 80s.

.SHORT TERM (Overnight)...
In the low levels of the atmosphere, an area of high pressure will
be located over the Mid-Atlantic United States overnight. In the
mid levels of the atmosphere, an area of high pressure will be
centered over the southeastern United States tonight. In the upper
levels of the atmosphere, a ridge of high pressure will pass
eastward across the Florida peninsula overnight. The 00z KKEY
sounding is moderately unstable and seasonably moist, with a
precipitable water (PWAT) value just above one and one half of an
inch. Atmospheric moisture will increase overnight. By sunrise
Saturday, PWAT values will be just above one and three quarters of
an inch, which is near the 75th percentile for this time of year.
Middle of the road chance POPs should suffice for tonight.

&&

.MARINE...
A Small Craft Advisory is in effect for the coastal waters of the
Gulf of Mexico and Atlantic overnight due to sustained northeast
to east surface winds near 20 knots. A Small Craft Advisory will
likely be required for the coastal waters of the Gulf of Mexico
and Atlantic Saturday and Saturday night. A Small Craft Advisory
will likely be required for the coastal waters of the Florida
Straits Sunday. A Small Craft Advisory may be required for the
coastal waters of the Florida Straits Sunday night. No advisories
expected Monday through Tuesday night.

&&

.AVIATION...
VFR conditions will prevail at EYW and MTH tonight and Saturday.
MVFR conditions are conceivable at EYW and MTH after midnight
tonight and Saturday. This possibility is not great enough to
include in the terminal forecasts at this time. Sustained east
winds near 20 knots expected from just off the surface to about
3,000 feet.

&&

.CLIMATE...
On this date in Florida Keys weather history, in 1940, the low
temperature in Key West was 65 degrees. This set the daily record
for minimum temperature measured in Key West on October 20th, a
record which still stands 77 years later. Temperature records at
Key West date back to 1872.

&&

.KEY WATCHES/WARNINGS/ADVISORIES...
FL...None.
GM...Small Craft Advisory for GMZ032>035-042>044-052>055-072>075.

&&

$$

Public/Marine/Fire...BS
Aviation/Nowcasts....BS
Data Collection......Chesser

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