-- Discussion containing changed information from previous version are highlighted. --
365
FXUS64 KMRX 132354
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
754 PM EDT Sun Jul 13 2025

...New AVIATION...

.SHORT TERM...
(This evening through Monday)
Issued at 112 PM EDT Sun Jul 13 2025

Key Message:

Another day of isolated to scattered thunderstorms this afternoon
and evening. Main concerns with any strong to severe storm will be
winds between 40-60mph and isolated flooding.

Discussion:

This Afternoon & Evening: An upper-level weather system is hanging
out over the Great Lakes, but its not bringing much synoptic
support to our region. We`re already seeing some scattered showers
and storms early this afternoon, but forecast soundings suggest that
the environment is not supported of severe weather. That said, since
the airs pretty saturated with PWATS over 1.5" (around 75% of the
historical maximum for mid July) a few storms could dump a lot of
rain quickly or send out strong gusts up to 40 mph.

Monday: The same weather pattern sticks around, with more hit-or-
miss afternoon storms. Some of these could produce strong wind gusts
or quick downpours that could lead to flash flooding in spots. Temps
will rise and humidity will make it feel even hotterexpect heat
index values near 100 in most of the southern and central valley.
Areas farther north will feel a little cooler but still humid.

&&

.LONG TERM...
-- Changed Discussion --
(Monday night through next Sunday)
Issued at 112 PM EDT Sun Jul 13 2025

Key Messages:

1. Daily summer-time convection continues through the long term.
Still potential for increased coverage by late week as a trough
returns to the eastern U.S.

2. Hot conditions return as an upper ridges strength peaks in the
middle part of the work week. Heat indices in the mid 90s to near
100F will become more common across valley locations.

Discussion:

Trough moves eastward Monday with continued chances for diurnal
convection under the hot temperatures. Forecast soundings suggest
that effective shear remains about 10 knots or less, with typical
summer-time diurnal convection expected. The strongest storms could
lead produce wind gusts up to 40 mph and isolated flash flooding of
urban and low lying areas. Outside of storms expect it to remain hot
and muggy with with heat indices near 100F for much of the southern
and central valley. Low to mid 90s are more likely for northern
valley into southwest Virginia through the first half of the week.
Tuesday and Wednesday are currently looking to be the warmest days.

By Thursday a shortwave should be moving through the northern US.
With weakening subsidence aloft, we are likely to see increased
coverage of afternoon shower and thunderstorm activity... but the
temperatures will trend closer to seasonal normals. A humid air mass
will keep indices in the 90s and approaching triple digits in
southeast TN. Upper ridge looks to become dominant once again next
weekend, with daily shower and storm chances remaining likely.
-- End Changed Discussion --

&&

.AVIATION...
-- Changed Discussion --
(00Z TAFS)
Issued at 751 PM EDT Sun Jul 13 2025

Cannot rule out a brief shower/storm at CHA over the next few
hours. Otherwise, focus will turn to fog and low cig chances
overnight. TRI will continue to have the best chances and MVFR to
IFR conditions have been included for the time being. Additional
isolated to scattered convection tomorrow afternoon. Included
PROB30s for most likely times to see activity near a terminal.
-- End Changed Discussion --

&&

.PRELIMINARY POINT TEMPS/POPS...
-- Changed Discussion --
Chattanooga Airport, TN             72  95  74  96 /  10  30  10  40
Knoxville McGhee Tyson Airport, TN  71  93  72  94 /  20  30  20  50
Oak Ridge, TN                       70  91  71  93 /  20  40  20  50
Tri Cities Airport, TN              68  88  69  90 /  30  40  30  70
-- End Changed Discussion --

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...NONE.
VA...NONE.
&&

$$

SHORT TERM...
AVIATION...KRS