textproduct: Morristown
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
Updated at 801 PM EDT Sat Oct 17 2026
- Areas of frost are expected tonight into Sunday morning for the Cumberland Plateau, northeast Tennessee, southwest Virginia, and the Tennessee/North Carolina mountains.
- Patchy fog is likely again in the same areas Sunday night into Monday morning, followed by a slow warming trend and no rain expected through the week.
DISCUSSION
Issued at 232 PM EDT Sat Oct 17 2026
Currently, troughing is centered to our northwest with high pressure building in behind the recent frontal boundary. This has and will continue to promote brisk northerly to northeasterly winds into the evening hours. Tonight, the surface high will settle just to our northeast, leading to a decrease in winds and strong radiational cooling conditions. Frost development is expected across the Cumberland Plateau, southwest Virginia, and in and near the Tennessee and north Carolina mountains. On Sunday, troughing will merge with a system in the Atlantic. Height rises and light northeasterly flow are expected, leading to the start of a warming trend and highs back into the 60s for most. Radiational cooling will allow for another cool night and patchy fog Sunday night into Monday morning, mainly in northeastern areas.
The pattern for Tuesday through Thursday will remain largely unchanged with ridging to the west and the Atlantic system to our east. Height rises will allow for daytime highs to get back into the 70s with cool overnight lows continuing due to subsidence from continued high pressure. Late in the week, further height rises will push daytime highs further into the 70s, but no rain is expected.
AVIATION
(00Z TAFS) Issued at 801 PM EDT Sat Oct 17 2026
VFR conditions with light winds are expected at all sites through the forecast period.
PRELIMINARY POINT TEMPS/POPS
Chattanooga Airport, TN 44 67 42 70 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 40 67 40 70 / 0 0 0 0 Oak Ridge, TN 40 66 41 71 / 0 0 0 0 Tri Cities Airport, TN 34 66 36 70 / 0 0 0 0
MRX WATCHES/WARNINGS/ADVISORIES
NC...NONE. TN...NONE. VA...NONE.
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