textproduct: Morristown

KEY MESSAGES

Updated at 728 AM EDT Sat Aug 22 2026 - This afternoon and evening, isolated to scattered showers and storms are expected in Northeast Tennessee, Southwest Virginia and the East Tennessee Mountains. - Sunday and Monday will be dry with rain chances returning midweek.

UPDATE

Issued at 728 AM EDT Sat Aug 22 2026

Published a small update a brief bit ago to add fog into the early morning sunrise period and to expand the area of low rain and storm chances for later this afternoon and early evening after seeing the new day 1 forecast from the Storm Prediction Center. Coverage south of Interstate 40 is likely to be very isolated, if anything occurs at all, but cannot rule out the chance for a strong to severe wind gust given the dry air aloft.

DISCUSSION

Issued at 203 AM EDT Sat Aug 22 2026

In the upper levels, a trough is over the Ohio Valley, extending down to Florida. At the surface, a stationary boundary is over North Georgia. Showers and storms have mostly dissipated for the rest of the night. In the early morning hours, clearing skies will lead to fog development near bodies of water and low-lying areas. Patchy dense fog will be possible in the early morning hours.

A cold front will approach the region this afternoon and evening, bringing isolated to scattered showers and storms in Northeast Tennessee, Southwest Virginia and the East Tennessee Mountains. Elsewhere, will be mostly dry but some isolated activity will be possible. Some of the CAMs have come in wetter for today this cycle than last cycle, I think the timing of the cold front is lining up better with max heating. A few strong storms, possibly even severe can't be ruled out. The front will move through this evening bringing cooler temps and lower dew points tonight and tomorrow. Sunday dew points will be in the 60s and highs will be in the 80s (Chattanooga area may hit 90).

Sunday and Monday will be dry with high pressure at the surface. The upper level pattern will be about the same with a deep trough on the East Coast and a ridge centered over the Rockies.

The NBM has low rain chances Tuesday increasing to 30-40% chances by Wednesday. The trough will be centered over the Ohio Valley again by midweek with at least one shortwave rotating through the pattern Wednesday night or Thursday.

AVIATION

(12Z TAFS) Issued at 728 AM EDT Sat Aug 22 2026

Areas of patchy dense fog this morning will clear up in the next 1 to 2 hours. After that, VFR conditions across the region. A low chance for an isolated TS later today, carrying PROB30s at all 3 TAF sites though it is more likely to occur at KTRI where storms are more likely to form later today. Outside of storms, a few low wind gusts eclipsing 10 to 15 mph is possible in the afternoon, but generally light winds today. Passage of a cold front tonight lowers confidence for another round of fog/low clouds post 06z tonight.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 93 68 90 64 / 0 20 0 0 Knoxville McGhee Tyson Airport, TN 90 65 86 62 / 20 30 0 0 Oak Ridge, TN 90 63 86 60 / 20 30 0 0 Tri Cities Airport, TN 84 62 81 56 / 40 40 0 0

MRX WATCHES/WARNINGS/ADVISORIES

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