Area Forecast Discussion
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000
FXUS62 KKEY 291318
AFDKEY

Area Forecast Discussion
National Weather Service Key West FL
918 AM EDT THU SEP 29 2016

.DISCUSSION...
.CURRENTLY...
KBYX detects patchy, light rain over offshore Gulf of Mexico waters
north-northwest of the Lower Keys. Elsewhere, KBYX detects no
precipitation echoes in the remainder of the forecast area. Skies
over the island chain are variably cloudy. Winds over land are south
near 5 mph. C-MAN winds, on average, are south near 5 knots.
Temperatures are in the lower to mid 80s.

.SHORT TERM (This afternoon)...
In the low to mid levels of the atmosphere, an Atlantic ridge of
high pressure will extend across the Florida Straits this afternoon.
In the upper levels of the atmosphere, a trough of low pressure will
be located over the eastern Gulf of Mexico today. The 12z 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 this afternoon. By sunset this
evening, PWAT values will be just below two inches, which is near the
75th percentile for this time of year. Despite ample atmospheric
instability and moisture in place for convection, anticyclone flow in
the low to mid levels of the atmosphere will limit POPs to slight
chance category today.

&&

.MARINE...
Light southerly breezes will prevail on all Keys coastal waters this
afternoon. No advisories or cautionary headlines expected today
through at least Sunday night.

&&

.AVIATION...
VFR conditions will persist through 30/12z at both the Key West and
Marathon International Terminals. Winds will remain light mainly
south today, becoming variable overnight.

&&

.CLIMATE...
On this date in Florida Keys weather history, in 1994, 3.15 inches of
rain fell at Key West International Airport. This set the daily
record for maximum rainfall measured in Key West on September 29th, a
record which still stands 22 years later. Rainfall records at Key
West date back to 1871.

&&

.KEY Watches/Warnings/Advisories...
FL...None.
GM...None.

&&

$$

Public/Marine/Fire...BS
Aviation/Nowcasts....BWC
Data Collection......Fling

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