Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 157, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Dec 11, 2021, 10:59 AM EST for 4 counties in Tennessee. It was in force for 30 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Dec 11, 2021, 10:59 AM EST (15:59 UTC)
- Expired
- Dec 11, 2021, 11:29 AM EST
- In force
- 30 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Blount County, TN, Cocke County, TN, Jefferson County, TN, Sevier County, TN
The radar
The Knoxville radar (KMRX), 34 km from the middle of the area, began a volume at 16:00 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 11, 11:10 AM EST | TSTM WND DMG | Sevierville, TN | MULTIPLE REPORTS OF TREES BLOWN DOWN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 4.0 hours before the alert went out and 297 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
- 182 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 625 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 268 m²/s²
- 0-3 km storm-relative helicity
- 271 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.8
The text
As transmitted.
185 WUUS54 KMRX 111559 SVRMRX TNC009-029-089-155-111645- /O.NEW.KMRX.SV.W.0157.211211T1559Z-211211T1645Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Morristown TN 1059 AM EST Sat Dec 11 2021 The National Weather Service in Morristown has issued a * Severe Thunderstorm Warning for... East central Blount County in east Tennessee... Southeastern Jefferson County in east Tennessee... Southern Cocke County in east Tennessee... Sevier County in east Tennessee... * Until 1145 AM EST. * At 1058 AM EST, severe thunderstorms were located along a line extending from near Sevierville to 9 miles southeast of Maryville, moving east at 45 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Sevierville, Newport, Gatlinburg, Pigeon Forge, Parrottsville, Pittman Center, Townsend, Bird Crossing, Fairgarden and Wears Valley. This includes Interstate 40 in Tennessee between mile markers 429 and 445. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3602 8299 3567 8330 3562 8387 3598 8356 TIME...MOT...LOC 1558Z 259DEG 39KT 3592 8362 3564 8387 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ DGS
2 follow-up statements
802 WWUS54 KMRX 111617 SVSMRX Severe Weather Statement National Weather Service Morristown TN 1117 AM EST Sat Dec 11 2021 TNC009-111627- /O.CAN.KMRX.SV.W.0157.000000T0000Z-211211T1645Z/ Blount TN- 1117 AM EST Sat Dec 11 2021 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BLOUNT COUNTY IS CANCELLED... The storms which prompted the warning have moved out of the warned area. Therefore, the warning has been cancelled. LAT...LON 3602 8299 3573 8326 3571 8360 3599 8338 TIME...MOT...LOC 1617Z 254DEG 50KT 3596 8337 3572 8354 $$ TNC029-089-155-111645- /O.CON.KMRX.SV.W.0157.000000T0000Z-211211T1645Z/ Jefferson TN-Cocke TN-Sevier TN- 1117 AM EST Sat Dec 11 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM EST FOR SOUTHEASTERN JEFFERSON...SOUTHERN COCKE AND NORTHEASTERN SEVIER COUNTIES... At 1117 AM EST, severe thunderstorms were located along a line extending from near Dandridge to near Gatlinburg, moving east at 55 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Sevierville, Newport, Gatlinburg, Pigeon Forge, Parrottsville, Pittman Center, Chestnut Hill, Cosby, Bird Crossing and Fairgarden. This includes Interstate 40 in Tennessee between mile markers 430 and 444. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3602 8299 3573 8326 3571 8360 3599 8338 TIME...MOT...LOC 1617Z 254DEG 50KT 3596 8337 3572 8354 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ DGS
452
WWUS54 KMRX 111629
SVSMRX
Severe Weather Statement
National Weather Service Morristown TN
1129 AM EST Sat Dec 11 2021
TNC029-089-155-111639-
/O.CAN.KMRX.SV.W.0157.000000T0000Z-211211T1645Z/
Jefferson TN-Cocke TN-Sevier TN-
1129 AM EST Sat Dec 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JEFFERSON...
SOUTHERN COCKE AND NORTHEASTERN SEVIER COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds are
still possible with these thunderstorms.
LAT...LON 3602 8299 3573 8326 3571 8360 3599 8338
TIME...MOT...LOC 1628Z 259DEG 39KT 3598 8322 3574 8339
$$
DGSThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 11, 5:57 AM EST | Severe Thunderstorm Warning | MRX | Campbell, Scott | 48 min |
| Dec 11, 6:39 AM EST | Severe Thunderstorm Warning | MRX | Campbell, Scott | 51 min |
| Dec 11, 7:29 AM EST | Severe Thunderstorm Warning | MRX | Campbell, Scott | 46 min |
| Dec 11, 7:43 AM EST | Flash Flood Warning | MRX | Scott | 4 hr |
| Dec 11, 7:51 AM EST | Special Weather Statement | MRX | Campbell, Morgan | 54 min |
| Dec 11, 8:23 AM EST | Severe Thunderstorm Warning | MRX | Marion, Sequatchie | 52 min |
| Dec 11, 8:23 AM EST | Severe Thunderstorm Warning | MRX | Campbell, Claiborne, Scott | 37 min |
| Dec 11, 9:02 AM EST | Severe Thunderstorm Warning | MRX | Bledsoe, Bradley, Hamilton, McMinn, Meigs, Rhea and 1 more | 43 min |
| Dec 11, 9:18 AM EST | Special Weather Statement | MRX | Hamilton | 42 min |
| Dec 11, 9:18 AM EST | Severe Thunderstorm Warning | MRX | Bledsoe, Meigs, Rhea, Roane | 42 min |
| Dec 11, 9:34 AM EST | Severe Thunderstorm Warning | MRX | Bradley, Hamilton, Marion | 41 min |
| Dec 11, 9:44 AM EST | Severe Thunderstorm Warning | MRX | Bradley, Loudon, McMinn, Meigs, Monroe, Roane | 46 min |
| Dec 11, 9:51 AM EST | Severe Thunderstorm Warning | MRX | Anderson, Blount, Knox, Loudon, Roane | 39 min |
| Dec 11, 10:15 AM EST | Severe Thunderstorm Warning | MRX | Bradley, McMinn, Monroe, Polk | 45 min |
| Dec 11, 10:21 AM EST | Severe Thunderstorm Warning | MRX | Blount, Grainger, Jefferson, Knox, Sevier | 39 min |
| Dec 11, 10:25 AM EST | Severe Thunderstorm Warning | MRX | Blount, Loudon, McMinn, Monroe | 50 min |
| Dec 11, 10:30 AM EST | Special Weather Statement | MRX | Bradley | 45 min |
| Dec 11, 10:53 AM EST | Severe Thunderstorm Warning | MRX | Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson | 35 min |
| Dec 11, 10:59 AM EST | Special Weather Statement | MRX | Polk | 46 min |
| Dec 11, 11:28 AM EST | Special Weather Statement | MRX | Sullivan | 47 min |
| Dec 11, 11:49 AM EST | Special Weather Statement | MRX | Carter, Johnson, Washington | 41 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.