713 
FXUS64 KMRX 200540
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
140 AM EDT Tue Oct 20 2026

...New DISCUSSION, AVIATION...

.KEY MESSAGES...
Updated at 138 AM EDT Tue Oct 20 2026

- Dry weather dominates the forecast period, with cool mornings
  and pleasant afternoons each day. Afternoon relative humidity
  will remain on the lower side as well.

&&

.DISCUSSION...
Issued at 138 AM EDT Tue Oct 20 2026

Isolated patchy frost for parts of far northeast TN and southwest VA 
this morning. Increasing morning lows will diminish the potential 
for frost development for most. However, dense fog near waterways 
could be possible with colder air over top warmer waters in lakes 
and rivers.

For the week ahead, longwave troughing will remain well into Canada 
with ridging poking north between a closed upper low off of the Mid-
Atlantic and another closed low off of the west coast. A pseudo-
Omega block pattern. The western low eventually phases with the mean 
flow, meanwhile the Atlantic one expected to bring coastal issues to 
parts of the Eastern Seaboard due to hardly any movement, will 
become enveloped and shunted east towards the end of the week. No 
impacts here except persistent upper level ridging and surface high 
pressure.

Highs will remain in the low to mid (some upper) 70s range the rest 
of the forecast period into early next week. A general 
wash/rinse/repeat each day with light winds, mostly sunny/clear 
skies, low humidity, and no precipitation for at least the 
foreseeable future.

&&

.AVIATION...
(06Z TAFS)
Issued at 138 AM EDT Tue Oct 20 2026

Persistence forecast with clear skies, light winds, dry weather,
and VFR conditions. Cannot rule out the chance for river fog
between 9z and 13z as was seen yesterday, but not confident to
include in the TAFs.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             74  49  76  50 /   0   0   0   0 
Knoxville McGhee Tyson Airport, TN  75  46  75  47 /   0   0   0   0 
Oak Ridge, TN                       75  47  76  48 /   0   0   0   0 
Tri Cities Airport, TN              74  41  73  42 /   0   0   0   0 

&&

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

$$

DISCUSSION...KS
AVIATION...Wellington


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