Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 102, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Aug 9, 2021, 5:49 PM EDT for Morgan County, Scott County, Tennessee. It was in force for 41 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
- Aug 9, 2021, 5:49 PM EDT (21:49 UTC)
- Expired
- Aug 9, 2021, 6:30 PM EDT
- In force
- 41 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Morgan County, TN, Scott County, TN
The radar
The Knoxville radar (KMRX), 118 km from the middle of the area, began a volume at 21:49 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 |
|---|---|---|---|
| Aug 9, 6:05 PM EDT | TSTM WND DMG | Sunbright, TN | NUMEROUS TREES WERE BLOWN DOWN AROUND SUNBRIGHT. |
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, 9.8 hours before the alert went out and 170 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
- 788 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 892 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
204
WUUS54 KMRX 092149
SVRMRX
TNC129-151-092230-
/O.NEW.KMRX.SV.W.0102.210809T2149Z-210809T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
549 PM EDT Mon Aug 9 2021
The National Weather Service in Morristown has issued a
* Severe Thunderstorm Warning for...
Morgan County in east Tennessee...
Southwestern Scott County in east Tennessee...
* Until 630 PM EDT.
* At 549 PM EDT, a severe thunderstorm was located 11 miles northwest
of Wartburg, moving east at 20 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...
Wartburg, Huntsville, Helenwood, Sunbright, Rugby, High Point,
Robbins, Rugby State Park, Deerlodge and Elgin.
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.
&&
LAT...LON 3604 8446 3609 8482 3609 8484 3614 8488
3630 8481 3630 8479 3631 8479 3633 8477
3633 8476 3634 8474 3635 8474 3635 8473
3637 8473 3641 8443
TIME...MOT...LOC 2149Z 267DEG 19KT 3621 8474
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DGS2 follow-up statements
634
WWUS54 KMRX 092216
SVSMRX
Severe Weather Statement
National Weather Service Morristown TN
616 PM EDT Mon Aug 9 2021
TNC129-151-092230-
/O.CON.KMRX.SV.W.0102.000000T0000Z-210809T2230Z/
Morgan TN-Scott TN-
616 PM EDT Mon Aug 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR CENTRAL MORGAN AND SOUTH CENTRAL SCOTT COUNTIES...
At 616 PM EDT, a severe thunderstorm was located 7 miles north of
Wartburg, moving east at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Wartburg, Frozen Head State Park, Slick Rock, Petros, Elgin and
Coalfield.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3608 8472 3632 8463 3635 8444 3604 8446
TIME...MOT...LOC 2216Z 267DEG 19KT 3622 8456
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DGS282
WWUS54 KMRX 092228
SVSMRX
Severe Weather Statement
National Weather Service Morristown TN
628 PM EDT Mon Aug 9 2021
TNC129-151-092238-
/O.EXP.KMRX.SV.W.0102.000000T0000Z-210809T2230Z/
Morgan TN-Scott TN-
628 PM EDT Mon Aug 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MORGAN AND SOUTH
CENTRAL SCOTT COUNTIES WILL EXPIRE AT 630 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 3608 8472 3632 8463 3635 8444 3604 8446
TIME...MOT...LOC 2228Z 267DEG 19KT 3622 8450
$$
DGSThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 2:24 PM EDT | Special Weather Statement | MRX | Bradley | 36 min |
| Aug 9, 3:17 PM EDT | Special Weather Statement | MRX | Scott | 43 min |
| Aug 9, 5:29 PM EDT | Special Weather Statement | MRX | Scott | 46 min |
| Aug 9, 5:48 PM EDT | Severe Thunderstorm Warning | MRX | Scott | 42 min |
| Aug 9, 6:07 PM EDT | Areal Flood Advisory | MRX | Morgan | 3 hr |
| Aug 9, 7:13 PM EDT | Special Weather Statement | MRX | Anderson | 47 min |
| Aug 9, 7:55 PM EDT | Severe Thunderstorm Warning | MRX | Grainger, Knox, Union | 39 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.