520 
FXUS62 KKEY 211528
AFDKEY

Area Forecast Discussion
National Weather Service Key West FL
1128 AM EDT Tue Apr 21 2020

.DISCUSSION...
A weakening front is spreading south through our Gulf waters late
this morning. It will cross the Keys late this afternoon or early
this evening. Shower activity along the front is expected to
diminish this afternoon, though a mainland-borne afternoon shower
or thunderstorm could move from the Everglades eastward across
North Key Largo late this afternoon.

A pleasantly less muggy air mass will trickle in on north winds
behind the front tonight, with dewpoints bottoming out in the mid
60s on Wed morning. By Wednesday afternoon, a quick turn to
easterly winds will start to slosh the moister air mass back
across the Keys, so the more comfortable air mass will be short-
lived.

&&

.MARINE...
Westerly flow will continue until late this afternoon in advance
of a weak front that will cross the Keys by early evening. In
westerly flow, winds often enhance during the late afternoon and
early evening over the waters near the south tip of the Florida
peninsula, specifically for Florida Bay and oceanside waters
adjacent to the Upper Keys. Have therefore added SCEC headlines to
these waters for increasing winds this afternoon.

Behind the front, a turn to northerly winds is expected for
tonight, quickly snapping around out of the east by Wednesday
afternoon.

From synopsis...A weakening frontal boundary will press southeastward 
and cross our entire area late today and this evening. Beyond that, 
gentle northerly breezes will filter into the Keys tonight before 
turning southeast and freshening Wednesday night and early Thursday,
before mainly gentle southerly breezes prevail for the balance of 
this week and into early next weekend. 

&&

.AVIATION...
A weak cold front will pass south across the island terminals
around 22z-24z. Until the frontal passage, some cumulus congestus
will continue. In the west-southwest flow preceding the front, a
reverse cloud line has formed over the Lower/Middle Keys which
is producing a few showers near MTH. 

Following the frontal passage, a turn to northwest wind is
expected, turning north then northeast overnight. Drier low-level
air will arrive, leading to lifting of cloud bases then clearing
later this evening.

&&

.CLIMATE...
In 1987, the daily record low temperature of 63 degrees was recorded
in Key West. Temperature records date back to 1872.

&&

.KEY WATCHES/WARNINGS/ADVISORIES...
FL...None.
GM...None.
&&

$$

Public/Marine/Fire...Haner
Aviation/Nowcasts....Haner
Data Collection......BT

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