422
FXUS64 KOHX 231707
AFDOHX

Area Forecast Discussion
National Weather Service Nashville TN
1207 PM CDT Mon Sep 23 2024

...New SHORT TERM, LONG TERM...

.SHORT TERM...
(Rest of today through Tuesday)
Issued at 1200 PM CDT Mon Sep 23 2024

We expect a little more coverage of showers and storms this
afternoon than yesterday thanks to falling heights, stronger
shear, and perhaps some weak mid level impulses. A storm or 2 may
become briefly severe with gusty winds, but mid level lapse rates
are still unimpressive. Generally greater coverage of showers and
storms is expected north of I-40 with very low coverage down
toward the Alabama border.

A few showers or storms will linger tonight as deep southwest flow
develops ahead of an approaching trough. On Tuesday, coverage
will ramp up more as a surface front pushes into the area. A few
afternoon storms could be briefly severe with gusty winds. SPC has
our area under a marginal risk (1 out of 5). The additional
clouds and rain coverage will knock highs down a few degrees for
Tuesday.

&&

.LONG TERM...
(Tuesday Night through next Monday)
Issued at 1200 PM CDT Mon Sep 23 2024

The extended forecast continues to look unsettled with daily rain
chances. The front arriving Tuesday will stall out midweek as a
couple of big systems start to come into play. The first will be
a developing upper level low pressure system over Arkansas and the
other will be a likely tropical system coming up from the eastern
Gulf of Mexico. The tropical system is currently in the
strengthening stages and is expected to become strong Hurricane
Helene before moving onshore along the Florida Gulf Coast. The
storm will then gradually weaken as it gets lifted northward
between the upper level low over Arkansas and an upper ridge over
the Atlantic. The tropical low and mid latitude low are expected
to merge over the region this weekend keeping rain chances going
throughout the forecast period. The highest probabilities for
soaking rain in our area are shown Thursday into Friday as the
biggest slug of tropical moisture lifts across the area.

Our latest rainfall forecast shows generally 2 to 4 inches of
rain by Saturday with the higher totals over the Plateau.
Obviously there is a lot of uncertainty with this forecast
involving a tropical systems, so we could end up with lower or
perhaps higher totals. Localized flooding could be a concern
Thursday into Friday. Also, gusty winds and localized severe
storms cannot be ruled out, but there is far too much uncertainty
at this time to say what that risk level will be.

&&

.AVIATION...
(12Z TAFS)
Issued at 615 AM CDT Mon Sep 23 2024

Patchy dense fog has developed this morning, primarily impacting
KCKV, KCSV, and KSRB with IFR visibilities. This fog will diminish
after sunrise. Primary aviation concern through today will be
scattered showers and thunderstorms. Greatest coverage of storms
is expected between 18Z and 00Z, but confidence in exact timing
for terminals is low. Primary impacts will be reduced visibility
from heavy rain, gusty winds, and lightning. Fog is likely to
redevelop tonight, especially across the Plateau, with IFR
visibilities once again.

&&

.PRELIMINARY POINT TEMPS/POPS...
Nashville      90  71  86  67 /  40  30  70  60
Clarksville    86  69  82  63 /  40  50  70  20
Crossville     86  64  82  61 /  50  20  80  80
Columbia       91  69  86  65 /  30  30  70  60
Cookeville     86  66  84  64 /  50  20  80  80
Jamestown      84  64  81  63 /  60  30  80  80
Lawrenceburg   90  68  86  64 /  30  20  70  80
Murfreesboro   91  69  87  66 /  40  30  70  70
Waverly        89  67  81  62 /  30  40  70  20

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...13
LONG TERM....13
AVIATION.....Clements