Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 39, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Apr 8, 2021, 5:21 PM EDT for Campbell County, Morgan County, Scott County, Tennessee. It was in force for 39 min. 5 reports 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
- Apr 8, 2021, 5:21 PM EDT (21:21 UTC)
- Expired
- Apr 8, 2021, 6:00 PM EDT
- In force
- 39 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Campbell County, TN, Morgan County, TN, Scott County, TN
The radar
The Knoxville radar (KMRX), 102 km from the middle of the area, began a volume at 21:23 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 8, 5:30 PM EDT | TSTM WND DMG | Sunbright, TN | TREES DOWN. POSSIBLE TORNADO. |
| Apr 8, 5:30 PM EDT | TORNADO | 2 W Elgin, TN | 911 CENTER REPORTED A BRIEF TORNADO TOUCHDOWN IN THE NYDECK AREA. NO REPORTS OF DAMAGE AT THIS TIME. |
| Apr 8, 5:40 PM EDT | HAIL 1.25 | Sunbright, TN | QUARTER TO HALF DOLLAR SIZED HAIL REPORTED. |
| Apr 8, 5:45 PM EDT | HAIL 1 | 3 Nw Huntsville, TN | |
| Apr 8, 6:00 PM EDT | HAIL 1 | 2 S Oneida, TN | QUARTER SIZED HAIL ALONG HIGHWAY 27. |
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, 9.4 hours before the alert went out and 188 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
- 55 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 626 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 354 m²/s²
- 0-3 km storm-relative helicity
- 375 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
410
WUUS54 KMRX 082121
SVRMRX
TNC013-129-151-082200-
/O.NEW.KMRX.SV.W.0039.210408T2121Z-210408T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
521 PM EDT Thu Apr 8 2021
The National Weather Service in Morristown has issued a
* Severe Thunderstorm Warning for...
Northwestern Morgan County in east Tennessee...
Northwestern Campbell County in east Tennessee...
Scott County in east Tennessee...
* Until 600 PM EDT.
* At 520 PM EDT, a severe thunderstorm was located 12 miles northwest
of Wartburg, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
La Follette, Oneida, Jacksboro, Huntsville, Helenwood, Caryville,
Winfield, Sunbright, Rugby and Elk Valley.
This includes Interstate 75 in Tennessee between mile markers 138 and
150.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 3637 8413 3607 8480 3619 8491 3620 8491
3660 8440 3659 8436
TIME...MOT...LOC 2120Z 230DEG 34KT 3619 8478
HAIL...1.00IN
WIND...60MPH
$$
DH1 follow-up statement
938
WWUS54 KMRX 082138
SVSMRX
Severe Weather Statement
National Weather Service Morristown TN
538 PM EDT Thu Apr 8 2021
TNC013-129-151-082200-
/O.CON.KMRX.SV.W.0039.000000T0000Z-210408T2200Z/
Morgan TN-Campbell TN-Scott TN-
538 PM EDT Thu Apr 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHWESTERN MORGAN...NORTHWESTERN CAMPBELL AND SCOTT COUNTIES...
At 538 PM EDT, a severe thunderstorm was located 11 miles northwest
of Wartburg, moving northeast at 30 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
La Follette, Oneida, Jacksboro, Huntsville, Helenwood, Caryville,
Winfield, Sunbright, Elk Valley and Smokey Junction.
This includes Interstate 75 in Tennessee between mile markers 138 and
150.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 3637 8413 3614 8475 3621 8483 3624 8485
3660 8440 3659 8436
TIME...MOT...LOC 2138Z 230DEG 26KT 3626 8467
HAIL...1.25IN
WIND...60MPH
$$
DHThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 3:58 AM EDT | Wind Advisory | MRX | Blount, Carter, Cocke, Greene, Johnson, Monroe and 2 more | 19 hr |
| Apr 8, 4:47 PM EDT | Tornado Warning | MRX | Morgan, Scott | 43 min |
| Apr 8, 5:25 PM EDT | Tornado Warning | MRX | Campbell, Morgan, Scott | 35 min |
| Apr 8, 5:51 PM EDT | Tornado Warning | MRX | Campbell, Scott | 39 min |
| Apr 8, 5:56 PM EDT | Tornado Warning | MRX | Scott | 34 min |
| Apr 8, 6:16 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Scott | 44 min |
| Apr 8, 6:22 PM EDT | Tornado Warning | MRX | Campbell, Claiborne, Scott | 53 min |
| Apr 8, 6:44 PM EDT | Tornado Warning | MRX | Campbell, Scott | 46 min |
| Apr 8, 6:50 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Claiborne | 40 min |
| Apr 8, 6:52 PM EDT | Tornado Warning | MRX | Campbell, Claiborne, Scott | 38 min |
| Apr 8, 7:24 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Claiborne | 36 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.