Alert archive / Tennessee / Flash Flood Warnings in 2026

Flash Flood Warning 79, NWS Morristown, TN

September 23, 2026Knox County, Tennessee

NWS Morristown, TN issued this flash flood warning at Sep 23, 2026, 6:29 PM EDT for Knox County, Tennessee. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 23, 2026, 6:29 PM EDT (22:29 UTC)
Expired
Sep 23, 2026, 9:30 PM EDT
In force
3 hr
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Flood severity
None

County Knox County, TN

The radar

The Knoxville radar (KMRX), 52 km from the middle of the area, began a volume at 22:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.5 hours before the alert went out and 240 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2026-09-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2026-09-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
534 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 22, 8:46 PM EDTSpecial Weather StatementMRXRoane44 min
Sep 23, 11:13 AM EDTAreal Flood AdvisoryMRXMorgan, Scott3 hr
Sep 23, 11:17 AM EDTAreal Flood AdvisoryMRXCampbell, Scott3 hr
Sep 23, 2:38 PM EDTSpecial Weather StatementMRXBlount37 min
Sep 23, 3:09 PM EDTSpecial Weather StatementMRXBlount51 min
Sep 23, 4:10 PM EDTAreal Flood AdvisoryMRXMonroe2 hr
Sep 23, 4:34 PM EDTSpecial Weather StatementMRXPolk41 min
Sep 23, 4:38 PM EDTSpecial Weather StatementMRXBradley52 min
Sep 23, 5:05 PM EDTAreal Flood AdvisoryMRXMcMinn86 min
Sep 23, 5:10 PM EDTAreal Flood AdvisoryMRXBradley, Hamilton90 min
Sep 23, 5:39 PM EDTAreal Flood AdvisoryMRXHancock2 hr
Sep 23, 6:00 PM EDTAreal Flood AdvisoryMRXBlount, Knox, Loudon3 hr
Sep 23, 6:08 PM EDTSpecial Weather StatementMRXHancock37 min
Sep 23, 6:16 PM EDTSpecial Weather StatementMRXKnox44 min
Sep 23, 7:17 PM EDTAreal Flood AdvisoryMRXLoudon, Roane118 min
Sep 23, 7:55 PM EDTAreal Flood AdvisoryMRXAnderson, Knox50 min
Sep 23, 3:23 AM EDTFlood WatchMRXLee, Wise, City of Norton19 hr

Nearby

Flash Flood Warnings in Tennessee, 2026Every flash flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.