textproduct: Morristown

KEY MESSAGES

Updated at 218 PM EDT Sat Jul 4 2026

- Hot temperatures will continue through the weekend before subsiding next week. Continue to take precautions, find shade, and drink plenty of water.

- Shower and storm activity is expected mainly along and near the East Tennessee mountains, Northeast Tennessee and Southwest Virginia this afternoon. Elsewhere, activity will be more isolated this afternoon, possibly becoming more scattered this evening.

- Showers and storms will be more widespread Sunday afternoon and evening as a shortwave approaches.

- Continued diurnal storm activity combined with regular summer heat next week.

DISCUSSION

Issued at 218 PM EDT Sat Jul 4 2026

Radar was more active than expected this morning as an outflow boundary moved through the region. Current radar shows showers and storms near the East Tennessee/North Carolina mountains and also in Southwest Virginia/Northeast Tennessee. CAMs seem to be getting back on track with the current placement of storms. The previous run of CAMs had mountain storms moving into the Central TN Valley and Northeast TN this evening. The latest run has isolated to scattered activity mainly in the Central TN Valley this evening. Some CAMs don't have storms dissipating completely until after midnight. With the hit and miss nature of this activity, impacts on outdoor activities will not be widespread. Confidence is low on shower/storm coverage this afternoon/evening.

Storms will dissipate around or shortly after midnight. Sunday afternoon and evening showers and storms will be scattered to widespread as a trough moves into the Ohio Valley centered near IL/IN Sunday afternoon. A Marginal risk for severe can be expected in the afternoon and evening hours with good instability in place with CAPE around 1k to 2k J/kg. Heavy rain can also be expected locally with PWat values close to 2 inches and weak steering flow.

A trough will be over the Ohio Valley early next week bringing widespread showers and storms in the afternoon/evening hours. By midweek, a ridge builds into the region briefly before a broad trough moves in late in the workweek. The best energy will likely stay to the north but widespread diurnal thunderstorms seem likely for most of next week. Temperatures will still be hot but much closer to normal for July.

AVIATION

(18Z TAFS) Issued at 123 PM EDT Sat Jul 4 2026

Showers and thunderstorms are expected to be isolated this evening. Fog is possible in the early morning hours but confidence is low since none of the terminals have had a significant rain today. Showers and storms will be more widespread tomorrow, although likely just after this timeframe.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 75 95 74 91 / 40 60 40 50 Knoxville McGhee Tyson Airport, TN 73 93 73 90 / 70 60 40 50 Oak Ridge, TN 73 93 72 90 / 60 60 40 50 Tri Cities Airport, TN 70 93 69 89 / 50 60 30 50

MRX WATCHES/WARNINGS/ADVISORIES

NC...Heat Advisory until 8 PM EDT this evening for Cherokee-Clay.

TN...Heat Advisory until 8 PM EDT /7 PM CDT/ this evening for Anderson-Bledsoe-Blount Smoky Mountains-Bradley-Campbell- Claiborne-Cocke Smoky Mountains-East Polk-Grainger-Hamblen- Hamilton-Hancock-Hawkins-Jefferson-Johnson-Knox-Loudon- Marion-McMinn-Meigs-Morgan-North Sevier-Northwest Blount- Northwest Carter-Northwest Cocke-Northwest Greene-Northwest Monroe-Rhea-Roane-Scott TN-Sequatchie-Sevier Smoky Mountains-Southeast Carter-Southeast Greene-Southeast Monroe-Sullivan-Unicoi-Union-Washington TN-West Polk.

VA...Heat Advisory until 8 PM EDT this evening for Lee-Russell-Scott VA-Washington VA-Wise.