952 PM EDT Sun Apr 23 2017
Just about all echoes on KBYX doppler radar have cleared the
southeastern boundary of our service area. Birds have taken flight
northbound from the island chain and from the northern coast of
Cuba, clearly displayed on the low-level reflectivity loop over
the past hour or so. Winds are gentle to moderate from the
northwest. Under partly cloudy skies, temperatures are in the
middle to upper 70s along the island chain at this hour.
The evening local sounding shows indications of subsidence aloft,
thanks to the moderate northwesterly breezes extending to well
above 18000 feet. But there remains enough low level moisture to
wring out a brief shower overnight. The low pop, 10 percent, from
the afternoon zone issuance is plenty to cover that small
possibility. Temperatures should not drop too much overnight,
even with the winds from the northwest. No zone update is planned
late this evening.
No cautionary or advisory headlines will be necessary for any of
the coastal waters surrounding the Florida Keys overnight. The
only minor adjustment to the late evening coastal waters forecast
will be to set all winds initially to NW. The speeds advertised
this afternoon look good.
Prevailing VFR is expected tonight, but brief periods of MVFR
ceilings will be possible before sunrise at EYW & MTH. A weak
frontal boundary will cross the island chain around 24/14z. Behind
the boundary, winds will back to the northwest, and winds will gust
to near 20 knots by late morning/early afternoon.
On this date in Florida Keys weather history, in 1991, the low
temperature in Key West was 79 degrees. This set the daily record
for warmest minimum temperature measured in Key West on April 23rd,
a record which still stands 26 years later. Temperature records at
Key West date back to 1872.
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