textproduct: Morristown

KEY MESSAGES

Updated at 637 AM EDT Fri Sep 25 2026

- Cooler and drier conditions are expected through the weekend before a warming trend early next week.

- Uncertainty as to when widespread rain chances will return to the region. Possibly not until the latter part of next week.

DISCUSSION

Issued at 110 AM EDT Fri Sep 25 2026

Light showers have ended across the area. The drying and cooling trend is set to begin. A closed low just off of the mid-Atlantic coast will slowly drift north as upper level ridging moves in from the west, centering over the middle of the country into the weekend and the first full week of October. Under the upper low, coastal storm impacts are being felt across much of the Atlantic coast. Our area will be situated under high pressure with no precipitation in the forecast until maybe the end of the forecast period when another closed upper low/shortwave barrels east from CA and the desert SW. Of course, there are discrepancies this far out as to what will happen and when.

Under lower heights aloft from the coastal system and surface high pressure, temperatures will be running close to or just below normal for end of September and early October. A very welcomed thing to those tired of daily storms and record setting hot temperatures. Far northeastern parts of the CWA this morning may see lows in the 40s for the first time in a while. Drier air will continue filtering in, which will allow much cooler temperatures tomorrow morning and especially Sunday morning. 40s for lows could sink as far south as the I-40 corridor, excluding the Southern Appalachians. As ridging is allowed to edge a bit more east following the exit of the coastal upper low early next week, as well as surface high pressure moving to our east, warmer temperatures will begin increasing each day starting on Monday. Valley temperatures at the end of the forecast period will return to the mid to upper 80s and possibly more humid conditions.

AVIATION

(12Z TAFS) Issued at 637 AM EDT Fri Sep 25 2026

The MVFR cigs at CHA will lift and break up later this morning into early afternoon. Fog late in the period is possible mainly at TRI but the probability of impacts at the terminal look too low to include right now. Other than the lower cigs at CHA early, will have a VFR forecast for the period all sites. Winds will generally be from the north and northeast around 10kts or less during the day, then will become light overnight.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 80 55 80 55 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 76 51 76 50 / 0 0 0 0 Oak Ridge, TN 77 51 76 50 / 0 0 0 0 Tri Cities Airport, TN 73 44 74 43 / 0 0 0 0

MRX WATCHES/WARNINGS/ADVISORIES

NC...NONE. TN...NONE. VA...NONE.