420 
FXUS64 KMRX 150640
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
240 AM EDT Tue Sep 15 2026

...New DISCUSSION...

.KEY MESSAGES...
Updated at 239 AM EDT Tue Sep 15 2026

- Above normal temperatures continue through this week. 

- Most areas will remain dry this week, but the mountains will have 
some low chances of showers. 

&&

.DISCUSSION...
Issued at 239 AM EDT Tue Sep 15 2026

A large high pressure ridge will dominate the pattern across the 
Southeast this week. The main impact of the ridge will be abnormally 
warm temperatures continuing each day, with highs in the upper 80s 
to mid 90s in most of the TN Valley. CHA's streak of days reaching 
90+ degrees (now at 42 days) will likely continue through the 
weekend. The "good" news is that with dewpoints mainly in the 65 to 
70 range each day, the Heat Index will stay under Advisory criteria, 
but will still reach around 100 in the southern Valley. 

Some isolated showers are possible in the mountains and SW NC today 
through Thursday. Rain chances may increase slightly later in the 
week as the ridge appears to weaken and shift west a bit, but 
showers will still be limited mainly in the higher terrain areas. 

Rain chances are highly uncertain next week as some models are 
showing a tropical system moving into northern FL while a cold front 
approaches the OH Valley from the north. Confidence is low that 
these features will have run-to-run continuity this far out.

&&

.AVIATION...
(06Z TAFS)
Issued at 140 AM EDT Tue Sep 15 2026

Overall, quiet aviation conditions are expected with potential for
fog at TRI again. Confidence is lower than last night, but a TEMPO
was added in for the last few hours of the early morning.
Otherwise, SCT clouds around 5,000 feet are expected through the
day with southwesterly winds of around 10 kts. 

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             97  72  97  71 /   0   0   0   0 
Knoxville McGhee Tyson Airport, TN  95  70  94  70 /   0   0   0   0 
Oak Ridge, TN                       94  70  93  69 /   0   0   0   0 
Tri Cities Airport, TN              89  63  90  65 /   0   0  10   0 

&&

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

$$

DISCUSSION...DGS
AVIATION...BW


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