Areal Flood Advisory 12, NWS Key West, FL

Area Forecast Discussion
National Weather Service Key West FL
255 AM EST Sun Dec 19 2021

.DISCUSSION...
This morning, a frontal boundary is moving through the central
Gulf of Mexico and is progged to reach the Florida Panhandle and
Southern Georgia this morning. SPC meso analysis depicts
significant moisture convergence and weak instability ahead of the
boundary. The combined ingredients have put the Central Gulf and
portions of Florida at a marginal risk for isolated to strong to
severe storms. Not to be outdone, the Keys and southern Florida
are at a slight risk due to modest surface cape, rich moisture,
and weak veering at the surface. The higher moisture content is
advecting in from the western Atlantic waters, and portions of
the Caribbean waters. The moisture coupled with the meager
surface cape and very little inhibition yielded showers and
thunderstorms yesterday across most of the Keys. Similar
conditions are still continuing over the Straits of Florida and
the Lower and Middle Keys. KBYX doppler radar exhibits robust
showers and thunderstorms that are producing frequent lightning
and moderate to heavy rainfall over the area mentioned above.
This activity is progged to continue through the morning hours,
before diminishing by the afternoon. The Keys will experience
relatively benign weather conditions over the next 24 hours before
rain chances increase over the region ahead of an approaching
cold front Monday into Tuesday.

A shortwave trough will move into southeast Texas on Monday and
induce a surface reflection in the western Gulf of Mexico and
cause winds to freshen. Similar to yesterday, model guidance is
still struggling with the system's timing, position, and strength.
We will continue to take a wait and see approach with the
potential system. Nevertheless, Tuesday into Wednesday, rain
chances will increase ahead of the frontal boundary and decrease
when the boundary moves off the East Coast of the United States on
Wednesday. SPC put Florida in a marginal risk for strong to
severe thunderstorms on Tuesday. Due to the shortwave trough and
deepening surface cyclone moving into Florida, SPC put the FLorida
Peninsula in a marginal risk for strong to severe thunderstorms
on Tuesday.

&&

.MARINE...
There are no watches, warnings, or advisories currently in effect
for the coastal waters of the Florida Keys. From synopsis, high
pressure moving east over the western North Atlantic will result
in slackening breezes as a frontal boundary approaches the
Southeast United States. Light to gentle breezes are expected on
today. Breezes will freshen on Tuesday in response to a low
pressure system moving east across Florida. Cooler, drier air, and
fresh northwest to north breezes are expected on Wednesday behind
a cold front. Breezes will diminish once again Thursday and
Thursday night.

&&

.AVIATION...
Scattered showers and isolated thunderstorms will continue to
increase in coverage in the vicinity of both EYW and MTH island
terminals through the overnight period. Signs point to heavier and
prolonged activity for MTH and the Upper Keys through early
afternoon, while EYW remains on track to begin decreasing in
coverage after sunrise. Brief periods of MVFR ceilings, IFR
visibilities, and wind gusts near 20 knots remain possible with any
passing activity over either terminal. After activity has seized,
expect the surface winds to gradually turn to the northwest to north
and decrease to near 5 knots.

&&

.CLIMATE...
In 1905, the daily record rainfall of 0.95 inches was recorded in
Key West. Rainfall records for Key West date back to 1871.

&&

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

Public/Marine/Fire...TW
Aviation/Nowcasts....Williams
Data Acquisition.....Williams

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