Special Weather Statement, NWS Nashville, TN

Area Forecast Discussion
National Weather Service Nashville TN
1214 PM CDT Mon Jul 29 2024

...New AVIATION...

.SHORT TERM...
(Rest of today through Thursday Night)
Issued at 1108 AM CDT Mon Jul 29 2024

Quite a bit of cloud cover out there at forecast time, but shower
activity is pretty sparse. A few showers are being seen east of I-65
but most are getting a break. This looks like it won't be the case
all day, however. Upstream showers and thunderstorms from a decaying
MCS over southern Illinois continue to trek this way and while
intensities have dropped off significantly over the last few hours,
outflows from these storms could provide focusing mechanisms for
afternoon showers and thunderstorms here in the mid-state.
Fortunately, forecast shear values are meager throughout the
afternoon. 20-25 kts of deep layer shear should mitigate any severe
threat. Can't rule out a wind gust of 40-50 mph with any stronger
storm that may develop, but the bigger issue will be heavy rain.
Quite a bit of rain was seen along and east of I-65 yesterday,
especially north of I-40. If these same areas experience prolonged
rainfall this afternoon, at least some localized flooding may become
an issue.

Over the next 24-36 hours, as northwest flow aloft continues, models
persist in developing 2-3 more of these MCS-type features to our
northwest. One late tonight and another tomorrow afternoon, at
least. The downside is the poor ability of models to depict the
eventual trajectory of these type of thunderstorm complexes. For
now, in both instances, the highest PoPs will be along and east of
I-24. Again, some flooding is possible in areas that continue to
see multiple rounds of storms/heavy rain.

Afternoon highs (and eventual Heat Index values) over the next few
days may also prove to be tricky. Current NBM numbers suggest mid to
upper 90s in the afternoon tomorrow through Friday. Cloud cover and
afternoon storms may stymie some of this heat, especially east of
I-65, with those who miss out on any rain getting the brunt of
the heat. Of note, I've had to tamp down NBM dew points slightly
tomorrow as they seem very aggressive, but this still puts much of
our western 2/3 into Heat Advisory territory tomorrow afternoon.
This could also be the case each of the next few afternoons, but
we'll take one at a time due to the PoP uncertainty.

&&

.LONG TERM...
(Friday through next Monday)
Issued at 1108 AM CDT Mon Jul 29 2024

By Friday, we should start to lose the northwest flow aloft and
ridging to our west. This should slow down rain chances and allow
afternoon highs to moderate slightly. Extended guidance suggests
highs back into the low to mid 90s by the weekend and much lower
rain chances, but we'll have to see how an upper low to our north
pans out for the weekend. There could be enough influence for
Saturday afternoon storms and then a longer drying out period into
the start of next week.

&&

.AVIATION...
(18Z TAFS)
Issued at 1208 PM CDT Mon Jul 29 2024

Coverage of showers and thunderstorms has increased enough to
include VCTS and tempo groups in the 18Z tafs. Lower vsby in heavy
downpours and wind gusts to 30KT will be the main impacts. Outside
the storms, VFR conditions are expected this afternoon. Showers
and storms will diminish this evening. Later in the night, an MCS
will make a run at the area with impacts expected mainly at SRB/CSV.
Downpours and gusty winds are expected.

&&

.PRELIMINARY POINT TEMPS/POPS...
Nashville      77  97  79  99 /  40  30  30  20
Clarksville    77  96  77  96 /  40  20  20  10
Crossville     68  88  71  90 /  50  60  50  40
Columbia       75  97  76  97 /  20  20  10  10
Cookeville     71  90  73  91 /  50  50  50  30
Jamestown      69  87  72  91 /  60  60  70  40
Lawrenceburg   74  95  75  95 /  20  30  10  20
Murfreesboro   74  97  76  97 /  40  30  30  20
Waverly        75  97  76  97 /  30  10  10  10

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from noon to 7 PM CDT Tuesday for Bedford-Cheatham-
Davidson-Dickson-Giles-Hickman-Houston-Humphreys-Lawrence-Lewis-
Macon-Marshall-Maury-Montgomery-Perry-Robertson-Rutherford-Smith-
Stewart-Sumner-Trousdale-Wayne-Williamson-Wilson.

&&

SHORT TERM...Unger
LONG TERM....Unger
AVIATION.....13

Special Weather Statement
National Weather Service Nashville TN
205 PM CDT Mon Jul 29 2024

TNZ059-062-075-291930-
Rutherford TN-Williamson TN-Bedford TN-
205 PM CDT Mon Jul 29 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN RUTHERFORD...
SOUTHEASTERN WILLIAMSON AND NORTHERN BEDFORD COUNTIES THROUGH 230 PM
CDT...

At 204 PM CDT, Doppler radar was tracking a strong thunderstorm near
Nolensville, or 7 miles southeast of Franklin, moving east southeast
at 30 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Murfreesboro, Eagleville, Rover, Triune, and Rockvale.

This includes the following highways...
 Interstate 24 between mile markers 78 and 79.
 Interstate 840 between mile markers 32 and 50.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3568 8664 3569 8665 3570 8667 3580 8684
      3594 8673 3584 8641 3563 8656
TIME...MOT...LOC 1904Z 294DEG 26KT 3587 8672

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

21

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