Alert archive / Tennessee / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 200, NWS Morristown, TN

August 20, 2025Hamilton County, Marion County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 20, 2025, 3:42 PM EDT for Hamilton County, Marion County, Tennessee. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 20, 2025, 3:42 PM EDT (19:42 UTC)
Expired
Aug 20, 2025, 4:05 PM EDT
In force
23 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Hamilton County, TN, Marion County, TN

The radar

The Northeast Alabama radar (KHTX), 68 km from the middle of the area, began a volume at 19:45 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, 7.7 hours before the alert went out and 154 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 2025-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 250 joules per kilogram.LCLLFCEL10008507005003002001001 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 2025-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -38 square meters per square second.1939Sfc1 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
250 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
1093 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-38 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 1:47 PM EDTSpecial Weather StatementMRXMeigs, Rhea43 min
Aug 20, 2:02 PM EDTSpecial Weather StatementMRXRoane43 min
Aug 20, 2:22 PM EDTAreal Flood AdvisoryMRXMeigs, Rhea3 hr
Aug 20, 2:23 PM EDTSpecial Weather StatementMRXBledsoe52 min
Aug 20, 2:29 PM EDTSpecial Weather StatementMRXRhea46 min
Aug 20, 3:00 PM EDTAreal Flood AdvisoryMRXBledsoe, Rhea, Sequatchie3 hr
Aug 20, 3:02 PM EDTSpecial Weather StatementMRXRoane43 min
Aug 20, 3:14 PM EDTAreal Flood AdvisoryMRXBledsoe, Hamilton, Sequatchie2 hr
Aug 20, 3:19 PM EDTSpecial Weather StatementMRXHamilton41 min
Aug 20, 3:35 PM EDTSpecial Weather StatementMRXBradley40 min
Aug 20, 3:58 PM EDTAreal Flood AdvisoryMRXHamilton62 min
Aug 20, 4:02 PM EDTSpecial Weather StatementMRXMarion43 min
Aug 20, 4:26 PM EDTSpecial Weather StatementMRXGreene49 min
Aug 20, 4:31 PM EDTSpecial Weather StatementMRXJefferson44 min
Aug 20, 5:43 PM EDTSpecial Weather StatementMRXCocke, Jefferson47 min
Aug 20, 1:45 PM EDTSpecial Weather StatementMRXScott45 min
Aug 20, 2:17 PM EDTSpecial Weather StatementMRXRussell43 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2025Every severe thunderstorm warning in 2025

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.