Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 78, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jun 21, 2021, 6:54 PM EDT for Blount County, Knox County, Sevier County, Tennessee. It was in force for 51 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
- Jun 21, 2021, 6:54 PM EDT (22:54 UTC)
- Expired
- Jun 21, 2021, 7:45 PM EDT
- In force
- 51 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Blount County, TN, Knox County, TN, Sevier County, TN
The radar
The Knoxville radar (KMRX), 59 km from the middle of the area, began a volume at 22:56 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 |
|---|---|---|---|
| Jun 21, 7:12 PM EDT | TSTM WND DMG | 5 N Alcoa, TN | SEVERAL TREES DOWN ACROSS THE COUNTY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 10.9 hours before the alert went out and 244 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
- 1530 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 919 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 228 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 9.6
The text
As transmitted.
347 WUUS54 KMRX 212254 SVRMRX TNC009-093-155-212345- /O.NEW.KMRX.SV.W.0078.210621T2254Z-210621T2345Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Morristown TN 654 PM EDT Mon Jun 21 2021 The National Weather Service in Morristown has issued a * Severe Thunderstorm Warning for... Southeastern Knox County in east Tennessee... Northern Blount County in east Tennessee... Northwestern Sevier County in east Tennessee... * Until 745 PM EDT. * At 653 PM EDT, a severe thunderstorm was located near Louisville, or near Alcoa, moving east at 20 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Knoxville, Maryville, Alcoa, Pigeon Forge, Louisville, Rockford, Eagleton Village, Friendsville, Kimberlin Heights and Wildwood. This includes Interstate 40 in Tennessee between mile markers 378 and 389, and between mile markers 400 and 406. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3572 8411 3596 8410 3602 8363 3575 8360 TIME...MOT...LOC 2253Z 271DEG 19KT 3585 8401 HAIL...0.75IN WIND...60MPH $$ Garuckas
2 follow-up statements
187 WWUS54 KMRX 212313 SVSMRX Severe Weather Statement National Weather Service Morristown TN 713 PM EDT Mon Jun 21 2021 TNC009-093-155-212345- /O.CON.KMRX.SV.W.0078.000000T0000Z-210621T2345Z/ Knox TN-Blount TN-Sevier TN- 713 PM EDT Mon Jun 21 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR SOUTHEASTERN KNOX...NORTHEASTERN BLOUNT AND NORTHWESTERN SEVIER COUNTIES... At 713 PM EDT, a severe thunderstorm was located near Rockford, or 8 miles northeast of Alcoa, moving east at 25 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Knoxville, Pigeon Forge, Rockford, Eagleton Village, McMahan, Lake Forest, Seymour, Kodak, Kimberlin Heights and Wildwood. This includes Interstate 40 in Tennessee between mile markers 388 and 389, and between mile markers 400 and 406. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3573 8391 3598 8394 3602 8363 3575 8360 TIME...MOT...LOC 2313Z 265DEG 23KT 3585 8384 HAIL...0.75IN WIND...60MPH $$ Garuckas
556
WWUS54 KMRX 212337
SVSMRX
Severe Weather Statement
National Weather Service Morristown TN
737 PM EDT Mon Jun 21 2021
TNC009-093-155-212346-
/O.EXP.KMRX.SV.W.0078.000000T0000Z-210621T2345Z/
Knox TN-Blount TN-Sevier TN-
737 PM EDT Mon Jun 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN KNOX...
NORTHEASTERN BLOUNT AND NORTHWESTERN SEVIER COUNTIES WILL EXPIRE AT
745 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
LAT...LON 3573 8391 3598 8394 3602 8363 3575 8360
TIME...MOT...LOC 2336Z 271DEG 19KT 3585 8371
$$
GaruckasThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 4:21 PM EDT | Special Weather Statement | MRX | Morgan | 39 min |
| Jun 21, 4:29 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Morgan | 46 min |
| Jun 21, 4:40 PM EDT | Special Weather Statement | MRX | Grainger | 50 min |
| Jun 21, 4:48 PM EDT | Special Weather Statement | MRX | Union | 42 min |
| Jun 21, 4:55 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Morgan, Roane, Scott | 65 min |
| Jun 21, 5:01 PM EDT | Special Weather Statement | MRX | Claiborne | 44 min |
| Jun 21, 5:05 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Morgan, Scott | 40 min |
| Jun 21, 5:08 PM EDT | Severe Thunderstorm Warning | MRX | Grainger, Hancock, Hawkins | 67 min |
| Jun 21, 5:12 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Claiborne, Union | 48 min |
| Jun 21, 5:29 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Grainger, Knox, Union | 46 min |
| Jun 21, 5:34 PM EDT | Special Weather Statement | MRX | Bradley, Hamilton, Marion, Sequatchie | 41 min |
| Jun 21, 5:36 PM EDT | Severe Thunderstorm Warning | MRX | Grainger, Jefferson, Knox | 39 min |
| Jun 21, 5:42 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Claiborne | 48 min |
| Jun 21, 5:46 PM EDT | Special Weather Statement | MRX | Loudon | 44 min |
| Jun 21, 5:53 PM EDT | Severe Thunderstorm Warning | MRX | Hancock | 41 min |
| Jun 21, 5:57 PM EDT | Severe Thunderstorm Warning | MRX | Claiborne, Grainger, Hancock | 48 min |
| Jun 21, 6:02 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Loudon, McMinn, Monroe, Roane | 43 min |
| Jun 21, 6:02 PM EDT | Severe Thunderstorm Warning | MRX | Claiborne, Cocke, Grainger, Greene, Hamblen, Hawkins and 1 more | 58 min |
| Jun 21, 6:05 PM EDT | Special Weather Statement | MRX | McMinn | 40 min |
| Jun 21, 6:25 PM EDT | Special Weather Statement | MRX | Bradley, McMinn | 65 min |
| Jun 21, 6:33 PM EDT | Special Weather Statement | MRX | Anderson | 57 min |
| Jun 21, 6:50 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Monroe | 40 min |
| Jun 21, 7:19 PM EDT | Severe Thunderstorm Warning | MRX | Morgan, Rhea, Roane | 56 min |
| Jun 21, 7:41 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Blount, Knox, Loudon, Morgan, Roane | 49 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.