Area Forecast Discussion
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FXUS62 KKEY 271354

Area Forecast Discussion
National Weather Service Key West FL
954 AM EDT Sat May 27 2017

The `ghost line` mentioned in the previous forecast discussion
indeed brought a nearly solid but narrow band of showers inside
the reef from Sombrero Key westward, which rapidly dissipated
prior to 9 am.

High pressure in the 700-500 mb remains with axis across north
Florida with a near-surface col-region poised to remain in place
near the Florida Keys. Mesoscale processes should dominate this
afternoon with afternoon mainland seabreeze and surface ridge
across the eastern Gulf imparting a backing light northerly flow
across the southeast Gulf of Mexico. The 850-700 mb moisture
convergence axis seen this morning across the Florida Straits
should drift a bit southward today, and progged soundings today
reflect that with slight decrease in column moisture across the

While some puffs of moderate cumulus are possible over the Lower
Keys once again, the chance for measureable rainfall will remain
slight today. No changes are planned for the public zone and
related gridded forecast data.


At this time, no watches, warnings, advisories or cautionary
headlines are expected through at least Tuesday. Light and
variable winds are expected across the Florida Keys coastal waters
this afternoon. An afternoon seabreeze should turn winds southerly
over Florida Bay, with high pressure in the eastern Gulf of Mexico
likely backing winds from east to north over waters north of the
Lower Keys. Beyond the reef, a light and steady east to southeast
wind of 5 to 10 knots should continue through the afternoon.


A thin line of slow-moving showers near the Lower Keys has recently
rained out. The tempo for sub-VFR conditions at the KEYW terminal
will be removed in the very near term. Expect VFR conditions to
pervail there and at the KMTH terminal through the bulk of
theforecast period with light easterly or variable winds.


On this date in 1894, the low temperature in Key West dipped to 70
degrees. This is a long-standing low temperature record for May 27
in the city since temperature records have been kept since 1871.




Data Collection.....Vickery

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