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Area Forecast Discussion (AFD)

Issued by Key West, FL (KEY)

                            
676 
FXUS62 KKEY 201344
AFDKEY

Area Forecast Discussion
National Weather Service Key West FL
944 AM EDT Sun May 20 2018

.DISCUSSION...
.CURRENTLY...
KBYX detects scattered showers throughout the forecast area. Skies
over the island chain are mostly cloudy. Winds over land are east
to southeast near 15 mph. C-MAN winds, on average, are east to 
southeast at 15 to 20 knots. Temperatures are near 80 degrees. 

.SHORT TERM (This afternoon)...
In the low to mid levels of the atmosphere, a trough of low
pressure near South Florida will move into the eastern Gulf of
Mexico this afternoon. In the upper levels of the atmosphere, an
area of low pressure will be centered over the northeastern Gulf
of Mexico today. The 12z KKEY sounding is moderately unstable and
exceptionally moist for this time of year, with a precipitable
water value just above two inches. Atmospheric moisture will
remain constant this afternoon. Rain chances for the Florida Keys
today will remain well above normal for this time of year due to
the extremely moist and unstable air mass in place. 

&&

.MARINE...
A Small Craft Advisory is in effect for the coastal waters of the
Florida Straits this afternoon due to sustained east to southeast
winds near 20 knots. A Small Craft Advisory will likely be
required for the coastal waters of the Florida Straits tonight 
through Tuesday. A Small Craft Advisory may be required for the 
coastal waters of the Gulf of Mexico and Hawk Channel tonight
through Tuesday. A Small Craft Advisory may be required for the 
coastal waters of the Florida Straits Tuesday night. No advisories
expected Wednesday through at least Thursday. A Small Craft
Advisory may be required for the coastal waters of the Gulf of
Mexico and Atlantic Thursday night. 

&&

.AVIATION...
A swath of heavy rain showers, with a few embedded thunderstorms,
will impact EYW for the next few hours. Prepare for temporary
periods of IFR VIS, MVFR CIGS, and convective wind gusts of 20 to
25 knots. Although a few passing showers may brush near MTH, 
direct flight impacts are not advertised at this time.

&&

.CLIMATE...
On this date in Florida Keys weather history, in 2006, the low
temperature at Key West International Airport was 67 degrees. This
set the daily record for minimum temperature measured in Key West
on May 20th. Temperature records at Key West date back to 1872.

&&

.KEY WATCHES/WARNINGS/ADVISORIES...
FL...None.
GM...Small Craft Advisory for GMZ052>055-072>075.

&&

$$

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

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