textproduct: Morristown

KEY MESSAGES

Updated at 229 PM EDT Fri Sep 11 2026 - A few isolated showers and storms will be around through this evening, though most locations will stay dry. A strong storm or two is possible, mainly south of I-40.

- Saturday, better coverage of showers and storms. Locally heavy rainfall is the main threat due to elevated PW values of around 2 inches. Then showers and storms become more isolated on Sunday.

- Above normal temperatures expected through the forecast period. CHA has unofficially hit 90 again today, which makes 39 days straight of 90 or above. This unofficially breaks the all-time record for consecutive days with a high temp of 90 or greater, which was previously 38 days set back in 1993.

DISCUSSION

Issued at 229 PM EDT Fri Sep 11 2026

Better coverage of showers and storms currently exists to our south down across AL and GA. This activity is associated with a weak area of low pressure moving north toward our region. Some of this activity could approach our southern most areas later this afternoon and evening. Elsewhere, a few isolated showers and storms expected through the evening, but most areas stay dry. A strong storm or two is possible for areas south of I-40 with straight line damaging winds being the main threat.

Shortwave still set to move across the region tomorrow, providing an uptick in shower and storm coverage. The best coverage will be during peak heating. While severe weather isn't expected, a few strong storms are possible. Locally heavy rainfall remains the main threat due to elevated PW values of around 2 inches. A low- end threat for isolated flooding exists.

Drier air moves in on Sunday behind the shortwave, which means showers and storms will be more isolated. We then start the new week with the ridge of high pressure building back into the area. This will keep us hot with above normal temperatures and very low chances for rain. Isolated, diurnal, showers and storms possible over the high terrain. Mid-to-late week, a broad upper trough and frontal boundary approach from the north. This will help to nudge the high southward and transition our area to more zonal flow, which will allow for rain chances to return.

Forecast high tomorrow for Chattanooga is 88 degrees, due to increased cloud cover and showers/storms. If they do hit 90 though, the 90 degree and above streak will likely continue for several to numerous more days due to low precip chances into next week.

AVIATION

(18Z TAFS) Issued at 128 PM EDT Fri Sep 11 2026

Isolated showers and storms will be around this afternoon and evening. Greater confidence exist near CHA, so have a prob30 for TSRA and MVFR CIGS and VIS. MVFR CIGs early tomorrow morning at CHA and possibly TRI. More showers and storms tomorrow but likely beyond the end of this TAF cycle.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 72 88 71 93 / 60 70 30 10 Knoxville McGhee Tyson Airport, TN 72 86 70 90 / 20 70 50 20 Oak Ridge, TN 71 85 69 90 / 30 80 40 20 Tri Cities Airport, TN 67 85 67 85 / 0 80 60 20

MRX WATCHES/WARNINGS/ADVISORIES

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