Area Forecast Discussion
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FXUS62 KKEY 261258

Area Forecast Discussion
National Weather Service Key West FL
858 AM EDT Wed Apr 26 2017

The CONUS has bookend low pressure systems with one over the Upper
Mississippi Valley, and the other just of the Delaware coast. High
pressure is parked over South Florida and the Florida Keys this
morning. The morning sounding data shows a significant subsidence
inversion aloft. The tail end of the boundary attached to the low
of the DELMARVA is the most unstable area within the Key West
radar range this morning. A few showers are sliding northward off
last nights Cuban land breeze, and are disintegrating as they
enter the more stable environment. Winds are currently east to
southeast 5 to 10 knots at the island terminals and the marine
stations east of the Seven Mile Bridge, and near 10 knots at the
marine stations west of the Seven Mile Bridge.

Winds will gradually increase through Thursday night as a trough
moves out of the Colorado Front Range. Winds will surge on Friday
due to high pressure over the Atlantic being compressed by this
trough, which will strengthen the gradient over the area. Will add
a slight chance of showers to the forecast on Saturday through
Sunday night mainly due to speed convergence in the east to
southeast winds. The trough will lift out to the northeast on
Monday. An area of high pressure will move eastward across the
Gulf of Mexico on Monday that will decrease east winds through
Wednesday. decreasing winds and a bit more unstable airmass will
add to a higher potential for precipitating cloud lines Monday
through Wednesday.


No headlines today through at least Friday morning. A trough will
move across the eastern United States Thursday and Friday. High
pressure will build across the Western Atlantic and northern Gulf
of Mexico Friday through Sunday resulting in freshening breezes. A
small craft advisory may be required on Friday through much of the


VFR conditions will prevail at EYW and MTH today and tonight.
Sustained southeast to south 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 1948, 2.79 inches
of rain fell in Key West. This set the daily record for maximum
rainfall measured in Key West on April 26th, a record which still
stands 69 years later. Rainfall records at Key West date back to




Data Collection......Chesser

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