Alert archive / Tennessee / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 147, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at May 20, 2025, 4:56 PM CDT for 4 counties in Tennessee. It was in force for 49 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
- May 20, 2025, 4:56 PM CDT (21:56 UTC)
- Expired
- May 20, 2025, 5:45 PM CDT
- In force
- 49 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bledsoe County, TN, Hamilton County, TN, Marion County, TN, Sequatchie County, TN
The radar
The Northeast Alabama radar (KHTX), 79 km from the middle of the area, began a volume at 21:57 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 20, 2:36 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 9.9 hours before the alert went out and 144 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.
- Mixed-layer CAPE
- 1162 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 904 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 3.9
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at May 20, 2:41 PM CDT, 2 hours 15 minutes earlier.
Area forecast discussion, May 20, 2:41 PM CDT, 2 hours 15 minutes before
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</html>Hazardous weather outlook, May 20, 2:43 PM CDT, 2 hours 13 minutes before
Hazardous Weather Outlook National Weather Service Morristown TN 343 PM EDT Tue May 20 2025 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-211945- Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins- Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen- Northwest Cocke-Cocke Smoky Mountains-Northwest Greene- Southeast Greene-Washington TN-Unicoi-Northwest Carter- Southeast Carter-Roane-Loudon-Knox-Jefferson-Northwest Blount- Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains- Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe- Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-Lee- Wise-Scott VA-Russell-Washington VA- 343 PM EDT Tue May 20 2025 /243 PM CDT Tue May 20 2025/ This Hazardous Weather Outlook is for portions of southwest North Carolina...east Tennessee and southwest Virginia. .DAY ONE...This Afternoon and Tonight Severe thunderstorms are expected to continue this afternoon and into the overnight hours ahead of a cold front. Damaging winds will be the primary risk, but there will be a chance of large hail and tornadoes with the strongest storms. .DAYS TWO THROUGH SEVEN...Wednesday through Monday The probability of widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not needed at this time.
In the hours before
Special weather statement, May 20, 3:54 PM CDT, 1 hour 2 minutes before
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</html>Local storm report, May 20, 4:42 PM CDT, 14 minutes before
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</html>The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 1:22 PM CDT | Special Weather Statement | MRX | Anderson | 38 min |
| May 20, 1:27 PM CDT | Special Weather Statement | MRX | Campbell, Morgan, Scott | 48 min |
| May 20, 1:37 PM CDT | Severe Thunderstorm Warning | MRX | Anderson, Knox, Morgan, Roane | 53 min |
| May 20, 2:00 PM CDT | Tornado Warning | MRX | Anderson, Knox, Morgan, Roane | 45 min |
| May 20, 2:25 PM CDT | Special Weather Statement | MRX | Claiborne, Union | 50 min |
| May 20, 2:35 PM CDT | Special Weather Statement | MRX | Union | 40 min |
| May 20, 3:20 PM CDT | Special Weather Statement | MRX | Hamblen | 40 min |
| May 20, 3:30 PM CDT | Severe Thunderstorm Warning | MRX | Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson | 45 min |
| May 20, 3:56 PM CDT | Special Weather Statement | MRX | Hawkins | 49 min |
| May 20, 3:59 PM CDT | Severe Thunderstorm Warning | MRX | Marion, Sequatchie | 61 min |
| May 20, 4:09 PM CDT | Severe Thunderstorm Warning | MRX | Greene, Unicoi, Washington | 51 min |
| May 20, 4:39 PM CDT | Special Weather Statement | MRX | Sullivan | 51 min |
| May 20, 4:48 PM CDT | Special Weather Statement | MRX | Carter, Unicoi | 57 min |
| May 20, 5:00 PM CDT | Special Weather Statement | MRX | Carter | 45 min |
| May 20, 5:14 PM CDT | Special Weather Statement | MRX | Johnson | 46 min |
| May 20, 5:42 PM CDT | Severe Thunderstorm Warning | MRX | Bradley, Hamilton, Meigs, Rhea | 48 min |
| May 20, 6:11 PM CDT | Severe Thunderstorm Warning | MRX | McMinn, Meigs, Monroe | 49 min |
| May 20, 6:54 PM CDT | Special Weather Statement | MRX | Monroe | 66 min |
| May 20, 3:54 PM CDT | Special Weather Statement | MRX | Russell, Scott, Wise, City of Norton | 51 min |
| May 20, 4:33 PM CDT | Severe Thunderstorm Warning | MRX | Russell, Washington | 42 min |
| May 20, 5:09 PM CDT | Special Weather Statement | MRX | Washington | 36 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.