textproduct: Morristown

KEY MESSAGES

Updated at 713 PM EDT Mon Jun 29 2026

- Isolated to scattered showers and thunderstorms this afternoon mainly northeast, then diminishing this evening.

- Very hot this week with high temperatures well into the 90s common. Afternoon heat index values will climb to around or above 100 degrees in in most valley locations multiple days.

DISCUSSION

Issued at 214 PM EDT Mon Jun 29 2026

There have been a few showers showing up on radar over the northeast, and a few showers and possibly thunderstorms will continue over our northeastern areas through this afternoon before dissipating by early tonight. Will continue to mention the possibility of localized flooding in the HWO for any areas of heavy rain that may occur over already saturated soils.

A large upper ridge over the eastern CONUS will dominate our weather this week, providing mostly dry and very hot conditions. The better chances for an afternoon shower or thunderstorm will be over the mountains Tuesday and Wednesday. By Thursday into the weekend, the ridge axis shifts to our east and isolated to scattered showers and storms will be possible even in valley areas mainly during the afternoon hours.

The main story for the week looks to be the hot conditions. High temperatures are expected to be in the 90s across all but the higher elevations each day this week and through the weekend, with mid to upper 90s across portions of the valley especially Wednesday through Friday which right now look to be the hottest days. Heat index values around or above 100 will common in the afternoons, and heat index values may exceed 105 across portions of the area especially Wednesday and Thursday. While forecast heat index values are borderline for a heat advisory at this time, based on the heightened impacts of a multi-day period of very hot conditions a heat advisory will be issued starting Tuesday and continuing through Thursday. It may eventually need to be extended longer in time as it still looks very hot Friday and into at least the beginning of the weekend, but for now will start with this three day period given forecast uncertainties in the longer ranges.

A short wave may bring more coverage of showers and storms along with slightly lower temperatures by Sunday or Monday, but confidence in the details is low that far out.

AVIATION

(00Z TAFS) Issued at 713 PM EDT Mon Jun 29 2026

The main aviation impact this period will be the potential for fog again at TRI. Vis went down hard last night, but the complicating factor tonight will be whether clouds will clear out. Models show conflicting signals on this, leading to a low confidence forecast. For now, will maintain MVFR vis in the TAF with some scattered clouds, but if clouds fully clear out, then vis will likely drop hard again to LIFR or lower.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 76 97 77 98 / 0 0 10 20 Knoxville McGhee Tyson Airport, TN 73 93 73 94 / 0 0 0 10 Oak Ridge, TN 73 94 74 95 / 0 10 0 10 Tri Cities Airport, TN 69 93 70 95 / 10 10 0 10

MRX WATCHES/WARNINGS/ADVISORIES

NC...Heat Advisory from 11 AM Tuesday to 9 PM EDT Thursday for Cherokee-Clay.

TN...Heat Advisory from 11 AM EDT /10 AM CDT/ Tuesday to 9 PM EDT /8 PM CDT/ Thursday 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 from 11 AM Tuesday to 9 PM EDT Thursday for Lee- Russell-Scott VA-Washington VA-Wise.