Area Forecast Discussion
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FXUS62 KKEY 251849

Area Forecast Discussion
National Weather Service Key West FL
249 PM EDT Tue Apr 25 2017

South Florida and the Keys are under the influence of high
pressure spreading northward from the Caribbean. A vigorous low
pressure system is moving northward along the Outer Banks with a
frontal zone extending southward across the central Bahamas. Winds
along the Keys Island Chain are out of the west at 5 to 10 knots
at the island terminals and the marine stations west of the Seven
Mile Bridge, and near 10 knots at the C-MAN Stations to the east.

No changes are required for this forecast cycle. Lower dew point
temperatures and light winds overnight will allow for some added
radiational cooling along the Island Chain, dropping lows to 65
to 70 degrees. Then the warming trend begins on Wednesday. Winds
will turn east to southeast allowing warmer air to advect over the
area returning daily maximums to the mid 80`s by Wednesday and
through the weekend. Helping the warm air to move northward will
be a trough moving across the easter United States Wednesday night
and Thursday. High pressure over the Atlantic will strengthen
resulting in increasing east to southeast winds on Friday.
Expecting fresh winds Friday night through Sunday night, but rain
chances will be low due to stable air aloft. The next trough will
dig through the Colorado Front Range on Sunday night, then lift
quickly northeastward. As the trough lifts out, a weakening
frontal zone will decay north of the area. High pressure will move
over the southeastern Gulf of Mexico resulting gentle to light
winds through midweek.


Light and variable winds overnight will turn northeast to east
and increase slightly. A trough will move across the eastern
United States on Thursday and help to strengthen the pressure
gradient around the Atlantic high pressure. This will result in
freshening breezes on Friday night through Sunday night. A small
craft advisory is likely late Friday through Sunday night.


VFR conditions through the period with mostly clear skies. Expect
west winds 8-10 knots today with some gusts around 15 knots. Winds
will diminish to less than 5 knots after sunset. Southeast winds
around 10 knots expected Wednesday.


On this date in Keys Weather History. April 25, 1948. 2.21 inches
of rain fell at the Key West Airport setting the daily record for
rainfall. Rainfall records for Key West date back to 1871.


Key West  69  83  76  85 / -  -  -  -
Marathon  69  85  76  87 / -  -  -  -




Data Collection......Chesser

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