Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 48, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at May 4, 2021, 8:37 AM CDT for 4 counties in Tennessee. It was in force for 38 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
- May 4, 2021, 8:37 AM CDT (13:37 UTC)
- Expired
- May 4, 2021, 9:15 AM CDT
- In force
- 38 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bledsoe County, TN, Morgan County, TN, Rhea County, TN, Roane County, TN
The radar
The Knoxville radar (KMRX), 126 km from the middle of the area, began a volume at 13:38 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 |
|---|---|---|---|
| May 4, 8:45 AM CDT | TSTM WND DMG | 2 Ene High Point, TN | SEVERAL TREES DOWN ALONG HWY 62 IN THE CHESTNUT RIDGE COMMUNITY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 4, 5:13 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 4, 8:37 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 1.6 hours before the alert went out and 280 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
- 590 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 753 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted.
452
WUUS54 KMRX 041337
SVRMRX
TNC007-129-143-145-041415-
/O.NEW.KMRX.SV.W.0048.210504T1337Z-210504T1415Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
937 AM EDT Tue May 4 2021
The National Weather Service in Morristown has issued a
* Severe Thunderstorm Warning for...
Southern Morgan County in east Tennessee...
Northeastern Rhea County in east Tennessee...
Northeastern Bledsoe County in east Tennessee...
Roane County in east Tennessee...
* Until 1015 AM EDT/915 AM CDT/.
* At 937 AM EDT/837 AM CDT/, severe thunderstorms were located along
a line extending from 11 miles west of Wartburg to near Fairfield
Glade to 13 miles northeast of Spencer, moving east at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Oak Ridge, Kingston, Rockwood, Wartburg, Fairview, Oliver Springs,
Spring City, Midtown, Harriman and Oakdale.
This includes Interstate 40 in Tennessee between mile markers 341 and
358.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3577 8504 3575 8503 3576 8492 3586 8473
3591 8468 3598 8471 3609 8480 3609 8483
3611 8486 3617 8480 3608 8436 3605 8434
3600 8432 3580 8445 3571 8468 3574 8472
3570 8472 3570 8477 3565 8485 3576 8524
TIME...MOT...LOC 1337Z 287DEG 30KT 3610 8478 3593 8493 3582 8524
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
BW1 follow-up statement
123
WWUS54 KMRX 041405
SVSMRX
Severe Weather Statement
National Weather Service Morristown TN
1005 AM EDT Tue May 4 2021
TNC129-041414-
/O.CAN.KMRX.SV.W.0048.000000T0000Z-210504T1415Z/
Morgan TN-
1005 AM EDT Tue May 4 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MORGAN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until noon EDT/1100 AM
CDT/ for east Tennessee. A Severe Thunderstorm Watch also remains in
effect until 200 PM EDT/100 PM CDT/ for east Tennessee.
LAT...LON 3576 8524 3577 8504 3575 8503 3576 8492
3583 8477 3591 8468 3595 8458 3595 8455
3596 8455 3598 8452 3599 8444 3605 8434
3600 8432 3580 8445 3571 8467 3574 8472
3570 8472 3570 8477 3565 8485
TIME...MOT...LOC 1404Z 287DEG 30KT 3604 8454 3587 8469 3576 8500
$$
TNC007-143-145-041415-
/O.CON.KMRX.SV.W.0048.000000T0000Z-210504T1415Z/
Rhea TN-Bledsoe TN-Roane TN-
1005 AM EDT Tue May 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 AM
EDT/915 AM CDT/ FOR NORTHEASTERN RHEA...NORTHEASTERN BLEDSOE AND
ROANE COUNTIES...
At 1004 AM EDT/904 AM CDT/, severe thunderstorms were located along a
line extending from near Wartburg to Rockwood to 9 miles northwest of
Spring City, moving east at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Oak Ridge, Kingston, Rockwood, Fairview, Oliver Springs, Spring City,
Midtown, Harriman, Stinging Fork Falls State Park and Eagle Furnace.
This includes Interstate 40 in Tennessee between mile markers 341 and
358.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3576 8524 3577 8504 3575 8503 3576 8492
3583 8477 3591 8468 3595 8458 3595 8455
3596 8455 3598 8452 3599 8444 3605 8434
3600 8432 3580 8445 3571 8467 3574 8472
3570 8472 3570 8477 3565 8485
TIME...MOT...LOC 1404Z 287DEG 30KT 3604 8454 3587 8469 3576 8500
HAIL...0.75IN
WIND...60MPH
$$
BWThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 7:29 PM CDT | Special Weather Statement | MRX | Greene, Unicoi, Washington | 46 min |
| May 3, 7:47 PM CDT | Special Weather Statement | MRX | Hamblen, Jefferson | 43 min |
| May 4, 2:10 AM CDT | Severe Thunderstorm Warning | MRX | Morgan, Roane | 50 min |
| May 4, 2:53 AM CDT | Severe Thunderstorm Warning | MRX | Anderson, Morgan, Roane | 52 min |
| May 4, 2:56 AM CDT | Special Weather Statement | MRX | Morgan | 49 min |
| May 4, 3:12 AM CDT | Special Weather Statement | MRX | Morgan | 48 min |
| May 4, 3:40 AM CDT | Severe Thunderstorm Warning | MRX | Anderson, Knox | 30 min |
| May 4, 3:45 AM CDT | Special Weather Statement | MRX | Blount | 45 min |
| May 4, 3:57 AM CDT | Areal Flood Advisory | MRX | Anderson, Morgan, Roane | 3 hr |
| May 4, 4:14 AM CDT | Special Weather Statement | MRX | Knox | 46 min |
| May 4, 4:34 AM CDT | Special Weather Statement | MRX | Blount | 41 min |
| May 4, 5:05 AM CDT | Severe Thunderstorm Warning | MRX | Blount, Sevier | 30 min |
| May 4, 5:11 AM CDT | Areal Flood Advisory | MRX | Anderson, Knox | 3 hr |
| May 4, 5:16 AM CDT | Areal Flood Advisory | MRX | Blount | 3 hr |
| May 4, 5:52 AM CDT | Special Weather Statement | MRX | Sevier | 53 min |
| May 4, 6:00 AM CDT | Flash Flood Warning | MRX | Blount, Sevier | 3 hr |
| May 4, 6:24 AM CDT | Areal Flood Advisory | MRX | Scott | 3 hr |
| May 4, 6:58 AM CDT | Special Weather Statement | MRX | Cocke | 47 min |
| May 4, 8:05 AM CDT | Special Weather Statement | MRX | Morgan, Scott | 40 min |
| May 4, 8:18 AM CDT | Special Weather Statement | MRX | Hamilton | 27 min |
| May 4, 8:48 AM CDT | Severe Thunderstorm Warning | MRX | Bledsoe, Rhea | 27 min |
| May 4, 8:50 AM CDT | Special Weather Statement | MRX | Anderson, Campbell, Claiborne, Union | 40 min |
| May 4, 8:53 AM CDT | Special Weather Statement | MRX | Hamilton, Marion, Sequatchie | 67 min |
| May 4, 9:03 AM CDT | Severe Thunderstorm Warning | MRX | Anderson, Blount, Knox, Loudon, Roane | 13 min |
| May 4, 9:18 AM CDT | Special Weather Statement | MRX | McMinn, Meigs | 57 min |
| May 4, 9:24 AM CDT | Special Weather Statement | MRX | Blount, Knox | 36 min |
| May 4, 9:37 AM CDT | Special Weather Statement | MRX | Hamblen | 38 min |
| May 4, 9:41 AM CDT | Severe Thunderstorm Warning | MRX | Blount, Jefferson, Knox, Sevier | 34 min |
| May 4, 9:45 AM CDT | Severe Thunderstorm Warning | MRX | Blount, Monroe | 30 min |
| May 4, 10:10 AM CDT | Severe Thunderstorm Warning | MRX | Cocke, Jefferson, Sevier | 22 min |
| May 4, 10:11 AM CDT | Flash Flood Warning | MRX | Hamilton, Marion, Sequatchie | 3 hr |
| May 4, 10:29 AM CDT | Areal Flood Warning | MRX | Blount, Sevier | 6 hr |
| May 4, 10:44 AM CDT | Areal Flood Advisory | MRX | Blount, Monroe | 2 hr |
| May 4, 10:47 AM CDT | Areal Flood Advisory | MRX | Blount, Sevier | 118 min |
| May 4, 11:06 AM CDT | Special Weather Statement | MRX | Polk | 24 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.