textproduct: Morristown

KEY MESSAGES

Updated at 233 PM EDT Thu Sep 10 2026 - A few isolated showers, and perhaps a storm or two, remain possible this afternoon and evening, mainly north of I-40. - Friday now looks drier as the front may wash out to our north.

- Saturday looks to be the best day for shower and storm coverage. Then more isolated again on Sunday. Saturday, locally heavy rainfall is the main threat due to elevated PW values of around 2 inches.

- Above normal temperatures expected through the forecast period. CHA has hit 90 again today, which is day 38. This now ties the record for consecutive days at or above 90 deg set back in 1993. With drier conditions now expected for tomorrow, the probability that CHA breaks the streak, with day 39, is very high.

DISCUSSION

Issued at 233 PM EDT Thu Sep 10 2026

Scattered to isolated showers remain mostly to our north, closer to a weak frontal boundary. However, some of our northern most areas may still see an isolated shower or storm this afternoon and evening. The frontal boundary was previously forecast to push into our area tonight and Friday. However, it now looks like the front may stay to our north. This means Friday will now be drier with only isolated showers, and perhaps a few storms, in place during the afternoon and evening hours.

Precip chances do increase Friday night into Saturday as a weak shortwave moves across the region. The best coverage of showers and storms will be on Saturday. A few strong storms and wind gusts are possible, but the main threat will continue to be locally heavy rainfall due to elevated PW values up around 2 inches. While isolated flooding potential exists, it's low. Clouds and showers/storms may prevent CHA from reaching 90 again on Saturday, but if they do hit 90 the consecutive streak with likely continue into next week.

Precip chances lessen on Sunday as drier air filters in from the northwest behind the shortwave, though a few isolated showers and storms remain possible.

High pressure then looks to build back into the area to start the week. This means the heat will remain with no meaningful rain chances. Though the east TN mountains may still see some isolated diurnal activity. By mid-to-late week, a broad upper trough and another frontal boundary approach from the north. As a result, precip chances increase during this timeframe due to more zonal flow and hopefully a frontal passage.

AVIATION

(18Z TAFS) Issued at 133 PM EDT Thu Sep 10 2026

VFR conditions are expected through the period at all sites with winds mostly out of the south to southwest at around 10kts or less. Probability of fog at TRI to low to mention in TAFs.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 72 96 73 90 / 0 20 60 90 Knoxville McGhee Tyson Airport, TN 70 94 72 89 / 0 10 50 80 Oak Ridge, TN 69 93 70 88 / 0 10 40 80 Tri Cities Airport, TN 66 88 67 87 / 10 20 20 80

MRX WATCHES/WARNINGS/ADVISORIES

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