Special Weather Statement, NWS Nashville, TN

Area Forecast Discussion
National Weather Service Nashville TN
532 PM CST Sun Dec 5 2021

.UPDATE...
FOR 00Z AVIATION DISCUSSION.

&&

.DISCUSSION...

Hopefully you've been able to get out and enjoy this late fall day
as temperatures have climbed into the mid 60s to lower 70s this
afternoon. Scattered showers have been contained to West Tennessee
so far, but that is changing as some showers move across the
Tennessee River. No lightning has been noted yet, but 500 J/kg of
MLCAPE is in place in that area with no capping. The shear is not
quite in place yet, so the thinking is a couple non severe storms
are possible this afternoon.

The severe threat increasing this evening as the low level jet
ramps up which increase the low level helicity. HREF shows mean
0-1 km SRH about 250 m2s2 after 00z. CAPE values are still
expected to be in excess of 500 J/kg. Models show another batch of
showers and storms move into the west likely after 8 PM. With the
parameters in place, it is possible for a couple of storms to be
severe with damaging winds and even a tornado. The timing for the
main event remains unchanged with the line of storms entering the
northwest around 2 AM, reaching metro between 5-6 AM, and exiting
the plateau by 9 AM. Models continue to show 0-1 km SRH values
exceeding 250 m2s2 ahead of the line with MLCAPE values around 500
J/kg. CAPE values begin to fall below 500 J/kg after 3 AM and
activity is expected to weaken as it approaches the plateau. The
main concerns continue to be damaging winds and a couple
tornadoes. Rain could be heavy at times with PWAT values around
the 95th percentile, but flooding shouldn't be an issue with the
progressive nature of the cold front.

Showers will quickly clear from west to east tomorrow with cold
air filtering into the area behind the front. In fact, locations
will start in the 50s and even 60s along the plateau, but will
fall into the 40s during the afternoon. Temperatures will fall
into the 20s by Tuesday morning. An upper trough will swing
through Tuesday night into Wednesday morning, but the best
moisture will be confined south and east of our area. A couple of
showers are possible late Tuesday night or early Wednesday
especially along the plateau. Profiles might be cool enough to
even support a few snow flakes, but this will be inconsequential.
Another shortwave slides well north of the area on Thursday, but
there is some moisture drawn northward toward a surface low that
will be lifting into the Great Lakes region. This could spark a
couple showers late Thursday. A more organized and potent system
will develop and impact our area late Friday or Saturday. This
system could have some severe weather or flooding potential and is
worth keeping an eye on.

&&

.AVIATION...
00Z TAF DISCUSSION.

Cold front will be on approach late tonight and will move into our
northwestern counties around 09Z. Look for showers to begin with
the fropa, and a small window of heavier tstms will occur just
ahead of the front. Shear is on the strong side and look for wind
gusts to persist for both convective and non convective scenarios.
The front and convection will clear the Plateau around 15Z.
Clearing will commence in our northwest around 18Z and transition
quickly eastward.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

DISCUSSION......Reagan
AVIATION........21

Hazardous Weather Outlook
National Weather Service Nashville TN
358 AM CST Sun Dec 5 2021

TNZ005>011-023>034-056>066-075-077>080-093>095-061030-
Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-Houston-
Humphreys-Dickson-Cheatham-Davidson-Wilson-Trousdale-Smith-Jackson-
Putnam-Overton-Fentress-Perry-Hickman-Lewis-Williamson-Maury-
Marshall-Rutherford-Cannon-De Kalb-White-Cumberland-Bedford-Coffee-
Warren-Grundy-Van Buren-Wayne-Lawrence-Giles-
358 AM CST Sun Dec 5 2021

This Hazardous Weather Outlook is for Middle Tennessee.

.DAY ONE...Today and tonight.

Strong to severe storms are possible late today and tonight...
especially across the northwest. Damaging wind is the main threat.
Minor flooding may also occur, also mainly across the northwest.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

A line of strong to severe storms will continue across the area early
Monday. It will weaken east of I-65 but will carry the potential to
the Plateau into the late morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any
information about observed severe weather to the NWS while following
all local, state, and CDC guidelines.

07

Special Weather Statement
National Weather Service Nashville TN
502 PM CST Sun Dec 5 2021

TNZ005-052330-
Stewart TN-
502 PM CST Sun Dec 5 2021

...A strong thunderstorm will impact portions of northern Stewart
County through 530 PM CST...

At 502 PM CST, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Dover, moving northeast at 45 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Big Rock and Land Between The Lakes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3666 8785 3663 8785 3664 8764 3661 8764
      3650 8804 3653 8803 3656 8803 3668 8807
      3668 8802
TIME...MOT...LOC 2302Z 243DEG 40KT 3659 8795

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Barnwell

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