847 
FXUS64 KMRX 041742
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
142 PM EDT Fri Sep 4 2026

...New DISCUSSION, AVIATION...

.KEY MESSAGES...
Updated at 138 PM EDT Fri Sep 4 2026
 
- Very hot conditions will continue again today with highs reaching 
well into the 90s and heat index values approaching or exceeding 100 
for most places outside the higher elevations. Take frequent breaks 
and drink plenty of water when outdoors.

- Heat Advisory extended through Saturday with conditions similar to 
today expected.

- A few storms this afternoon/evening mainly in southwest VA, and 
again on Saturday across the entire eastern Tennessee Valley. Some 
storms may may become strong to severe, with damaging wind gusts the 
primary threat.

-With a Heat Advisory in effect and the chance for afternoon
 thunderstorms anyone doing outdoor activities on Saturday should
 prepare for heat and keep an eye on the radar all afternoon.

&&

.DISCUSSION...
Issued at 138 PM EDT Fri Sep 4 2026

Dog days of summer continue through at least Saturday with the stout 
ridge staying relatively locked in place over the southern United 
States. Heat Advisory that was in effect for today has been extended 
to now include Saturday. Temperatures and Heat Index values will be 
relatively similar both today and tomorrow, with triple digits 
values expected for much of the eastern Tennessee Valley. If you 
plan on attending any outdoor activities this weekend it's extremely 
important to plan for these high temperatures. Drink plenty of water 
and stay in the shade as much as possible.

In addition, the hot temperatures today and tomorrow will bring a 
couple of rounds of afternoon showers and thunderstorms. With the 
very high temperatures some of the strongest storms could become 
severe with damaging winds as the primary hazard.  Showers and 
storms will be isolated in the Tennessee Valley today and more 
scattered in the higher elevations. 

On Saturday, the trough dips into the Ohio Valley as the ridge moves 
a bit west to be more over the Plains. At the surface, a weak cold 
front will move through the region, bringing better chances for 
showers and storms, especially north of Interstate 40. With better 
synoptic lift in place on Saturday, there is also a higher chance 
for strong to severe storms especially in extreme northeast 
Tennessee and southwest Virginia, closer to the trough. With 
moderate instability, weak deep layer shear and high freezing 
levels, the primary threat will be damaging straight-line winds once 
again.

Starting Sunday we'll get a "break" from these near record 
temperatures, but it's still going to be above normal for the 
foreseeable future as the stubborn ridge remains locked in place 
over the United States. There's a sliver of hope that heading into 
next weekend we get a bit cooler as a couple of system moving across 
Canada try and break down the ridge.

Daily Record High Maximum Temperatures

Date    Chattanooga    Knoxville      Tri-Cities     Oak Ridge             
09-04   102(1954)      101(1954)      99(1954)       100(1954)      
09-05 104(1925) 103(1954) 99(1954) 102(1954)

&&

.AVIATION...
(18Z TAFS)
Issued at 138 PM EDT Fri Sep 4 2026

VFR conditions expected for the next 24 hours. A few very isolated
storms are possible this afternoon, but they're likely to remain
isolated enough to not directly impact an airport.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             76  99  74  97 /   0  30  10  10 
Knoxville McGhee Tyson Airport, TN  74  95  72  93 /  10  20  20  20 
Oak Ridge, TN                       74  96  71  93 /   0  20  20  20 
Tri Cities Airport, TN              70  91  67  88 /  10  40  50  40 

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...Heat Advisory until 8 PM EDT /7 PM CDT/ Saturday for Anderson-
     Bledsoe-Bradley-Campbell-Claiborne-Grainger-Hamblen-
     Hamilton-Hancock-Hawkins-Jefferson-Knox-Loudon-Marion-
     McMinn-Meigs-Morgan-North Sevier-Northwest Blount-Northwest 
     Cocke-Northwest Greene-Northwest Monroe-Rhea-Roane-Scott TN-
     Sequatchie-Union-West Polk.

VA...NONE.
&&

$$

DISCUSSION...99
AVIATION...99


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