textproduct: Morristown

KEY MESSAGES

Updated at 706 AM EDT Sun Sep 13 2026 - Widespread dense fog expected this morning.

- Dry for most of the area through the week with above normal temperatures continuing.

DISCUSSION

Issued at 300 AM EDT Sun Sep 13 2026

Many locations have already developed dense fog, which is expected to expand through the next few hours as rain affected most of the area at some point yesterday. The latest model runs are quite bullish on fog, even the HRRR, which doesn't typically show much fog in advance. A Dense Fog Advisory may be needed later tonight.

A shortwave trough will cross the OH Valley and central Appalachians tomorrow afternoon and night, followed by a surface cold front. Most CAMS are keeping the showers to our north, although the 00Z NAM shows some light QPF in our northern sections as it brings the front to our northern border by 12Z Monday. NBM still has no PoPs, and will keep that going.

The backdoor front pushes through on Monday as a surface high moves into the Mid Atlantic, but it will provide little to no relief from the above normal temperatures (although dewpoints will be a little lower behind the front). Aloft, a ridge will be over the Southeast. Subsidence under this ridge will provide hot and dry conditions for most of the area through the week. With forecast highs at CHA in the lower to mid 90s each day, the streak of days reaching 90+ degrees will continue (now at 40).

AVIATION

(12Z TAFS) Issued at 706 AM EDT Sun Sep 13 2026

Reductions due to low clouds and/or fog have been observed at CHA and TYS and to a lesser degree at TRI. This should persist for the next hour or two before gradual improvements into the late morning and early afternoon. Other than some clouds around 5,000 to 10,000 feet, mostly clear conditions are expected with light northerly to northwesterly winds. Fog is possible again tonight into tomorrow morning but has been left out for the time being.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 94 70 96 70 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 90 68 90 67 / 0 0 0 0 Oak Ridge, TN 90 68 90 66 / 0 0 0 0 Tri Cities Airport, TN 85 64 84 62 / 10 10 10 0

MRX WATCHES/WARNINGS/ADVISORIES

NC...NONE. TN...Dense Fog Advisory until 9 AM EDT this morning for Anderson- Blount Smoky Mountains-Bradley-Campbell-Claiborne-Cocke Smoky Mountains-East Polk-Grainger-Hamblen-Hancock- Jefferson-Knox-Loudon-McMinn-Meigs-Morgan-North Sevier- Northwest Blount-Northwest Cocke-Northwest Monroe-Rhea- Roane-Scott TN-Sevier Smoky Mountains-Southeast Monroe- Union-West Polk.

VA...Dense Fog Advisory until 9 AM EDT this morning for Lee.