Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 18, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Feb 12, 2020, 8:22 PM EST for Campbell County, Morgan County, Scott County, Tennessee. It was in force for 53 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
- Feb 12, 2020, 8:22 PM EST (01:22 UTC)
- Expired
- Feb 12, 2020, 9:15 PM EST
- In force
- 53 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Campbell County, TN, Morgan County, TN, Scott County, TN
The radar
The Knoxville radar (KMRX), 94 km from the middle of the area, began a volume at 01:23 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 00:00Z, 1.4 hours before the alert went out and 195 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 548 m above ground
- 0-6 km bulk shear
- 99 kt
- 0-1 km storm-relative helicity
- 775 m²/s²
- 0-3 km storm-relative helicity
- 947 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Feb 12, 6:38 PM EST, 1 hour 44 minutes earlier.
Area forecast discussion, Feb 12, 6:38 PM EST, 1 hour 44 minutes before
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</html>Hazardous weather outlook, Feb 12, 3:21 PM EST, 5 hours 1 minute 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 |
|---|---|---|---|---|
| Feb 12, 8:00 PM EST | Severe Thunderstorm Warning | MRX | Marion | 45 min |
| Feb 12, 8:12 PM EST | Severe Thunderstorm Warning | MRX | Bledsoe, Hamilton, Rhea, Sequatchie | 48 min |
| Feb 12, 8:17 PM EST | Special Weather Statement | MRX | Anderson, Campbell, Morgan, Scott | 58 min |
| Feb 12, 8:30 PM EST | Severe Thunderstorm Warning | MRX | Hamilton, Marion, Sequatchie | 45 min |
| Feb 12, 8:38 PM EST | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Loudon, Morgan, Rhea, Roane and 1 more | 52 min |
| Feb 12, 8:56 PM EST | Severe Thunderstorm Warning | MRX | Bledsoe, Bradley, Hamilton, Loudon, McMinn, Meigs and 3 more | 64 min |
| Feb 12, 9:12 PM EST | Severe Thunderstorm Warning | MRX | Campbell, Claiborne, Grainger, Hancock, Scott, Union | 48 min |
| Feb 12, 9:22 PM EST | Severe Thunderstorm Warning | MRX | Anderson, Blount, Campbell, Grainger, Jefferson, Knox and 3 more | 53 min |
| Feb 12, 9:54 PM EST | Special Weather Statement | MRX | Grainger, Greene, Hamblen, Hancock, Hawkins | 66 min |
| Feb 12, 9:59 PM EST | Special Weather Statement | MRX | Blount, Cocke, Jefferson, Monroe, Sevier | 61 min |
| Feb 12, 10:42 PM EST | Special Weather Statement | MRX | Carter, Greene, Sullivan, Unicoi, Washington | 48 min |
| Feb 13, 7:27 AM EST | River Flood Warning | MRX | Cocke | 33 hr |
| Feb 13, 9:48 AM EST | River Flood Warning | MRX | Cocke, Jefferson | 14 hr |
| Feb 12, 9:56 PM EST | Special Weather Statement | MRX | Lee, Scott, Wise, City of Norton | 64 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 2020Every severe thunderstorm warning in 2020
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.