Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 47, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at May 4, 2021, 6:05 AM EDT for Blount County, Sevier County, 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
- May 4, 2021, 6:05 AM EDT (10:05 UTC)
- Expired
- May 4, 2021, 6:35 AM EDT
- In force
- 30 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Blount County, TN, Sevier County, TN
The radar
The Knoxville radar (KMRX), 66 km from the middle of the area, began a volume at 10:08 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, 6:15 AM EDT | HAIL 1 | 2 Sse Walland, TN |
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 00:00Z, 10.1 hours before the alert went out and 258 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
- 2263 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1050 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 7.6
The text
As transmitted.
243
WUUS54 KMRX 041005
SVRMRX
TNC009-155-041100-
/O.NEW.KMRX.SV.W.0047.210504T1005Z-210504T1100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
605 AM EDT Tue May 4 2021
The National Weather Service in Morristown has issued a
* Severe Thunderstorm Warning for...
Northeastern Blount County in east Tennessee...
Southwestern Sevier County in east Tennessee...
* Until 700 AM EDT.
* At 605 AM EDT, a severe thunderstorm was located 9 miles southeast
of Maryville, moving east at 25 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...
Gatlinburg, Pigeon Forge, Townsend, Wears Valley, Walland, Cades
Cove, Elkmont, Roundtop Mountain State Park, Happy Valley and Great
Smoky Mountains National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3556 8394 3570 8399 3587 8361 3564 8351
TIME...MOT...LOC 1005Z 250DEG 21KT 3566 8384
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
DGS2 follow-up statements
911
WWUS54 KMRX 041025
SVSMRX
Severe Weather Statement
National Weather Service Morristown TN
625 AM EDT Tue May 4 2021
TNC009-155-041100-
/O.CON.KMRX.SV.W.0047.000000T0000Z-210504T1100Z/
Blount TN-Sevier TN-
625 AM EDT Tue May 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 AM EDT
FOR EAST CENTRAL BLOUNT AND SOUTHWESTERN SEVIER COUNTIES...
At 625 AM EDT, a severe thunderstorm was located 10 miles southwest
of Pigeon Forge, or 11 miles west of Gatlinburg, moving east at 25
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Gatlinburg, Pigeon Forge, Townsend, Wears Valley, Walland, Roundtop
Mountain State Park and Great Smoky Mountains National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3561 8380 3572 8386 3587 8361 3567 8352
TIME...MOT...LOC 1025Z 250DEG 21KT 3570 8370
HAIL...1.00IN
WIND...60MPH
$$
DGS609
WWUS54 KMRX 041035
SVSMRX
Severe Weather Statement
National Weather Service Morristown TN
635 AM EDT Tue May 4 2021
TNC009-155-041045-
/O.CAN.KMRX.SV.W.0047.000000T0000Z-210504T1100Z/
Blount TN-Sevier TN-
635 AM EDT Tue May 4 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BLOUNT AND
SOUTHWESTERN SEVIER COUNTIES IS CANCELLED...
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 has been cancelled. However heavy rain
and frequent lightning are still possible with this thunderstorm.
LAT...LON 3561 8380 3572 8386 3587 8361 3567 8352
TIME...MOT...LOC 1034Z 250DEG 21KT 3572 8363
$$
DGSThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 8:29 PM EDT | Special Weather Statement | MRX | Greene, Unicoi, Washington | 46 min |
| May 3, 8:47 PM EDT | Special Weather Statement | MRX | Hamblen, Jefferson | 43 min |
| May 4, 3:10 AM EDT | Severe Thunderstorm Warning | MRX | Morgan, Roane | 50 min |
| May 4, 3:53 AM EDT | Severe Thunderstorm Warning | MRX | Anderson, Morgan, Roane | 52 min |
| May 4, 3:56 AM EDT | Special Weather Statement | MRX | Morgan | 49 min |
| May 4, 4:12 AM EDT | Special Weather Statement | MRX | Morgan | 48 min |
| May 4, 4:40 AM EDT | Severe Thunderstorm Warning | MRX | Anderson, Knox | 30 min |
| May 4, 4:45 AM EDT | Special Weather Statement | MRX | Blount | 45 min |
| May 4, 4:57 AM EDT | Areal Flood Advisory | MRX | Anderson, Morgan, Roane | 3 hr |
| May 4, 5:14 AM EDT | Special Weather Statement | MRX | Knox | 46 min |
| May 4, 5:34 AM EDT | Special Weather Statement | MRX | Blount | 41 min |
| May 4, 6:11 AM EDT | Areal Flood Advisory | MRX | Anderson, Knox | 3 hr |
| May 4, 6:16 AM EDT | Areal Flood Advisory | MRX | Blount | 3 hr |
| May 4, 6:52 AM EDT | Special Weather Statement | MRX | Sevier | 53 min |
| May 4, 7:00 AM EDT | Flash Flood Warning | MRX | Blount, Sevier | 3 hr |
| May 4, 7:24 AM EDT | Areal Flood Advisory | MRX | Scott | 3 hr |
| May 4, 7:58 AM EDT | Special Weather Statement | MRX | Cocke | 47 min |
| May 4, 9:05 AM EDT | Special Weather Statement | MRX | Morgan, Scott | 40 min |
| May 4, 9:18 AM EDT | Special Weather Statement | MRX | Hamilton | 27 min |
| May 4, 9:37 AM EDT | Severe Thunderstorm Warning | MRX | Bledsoe, Morgan, Rhea, Roane | 38 min |
| May 4, 9:48 AM EDT | Severe Thunderstorm Warning | MRX | Bledsoe, Rhea | 27 min |
| May 4, 9:50 AM EDT | Special Weather Statement | MRX | Anderson, Campbell, Claiborne, Union | 40 min |
| May 4, 9:53 AM EDT | Special Weather Statement | MRX | Hamilton, Marion, Sequatchie | 67 min |
| May 4, 10:03 AM EDT | Severe Thunderstorm Warning | MRX | Anderson, Blount, Knox, Loudon, Roane | 13 min |
| May 4, 10:18 AM EDT | Special Weather Statement | MRX | McMinn, Meigs | 57 min |
| May 4, 10:24 AM EDT | Special Weather Statement | MRX | Blount, Knox | 36 min |
| May 4, 10:37 AM EDT | Special Weather Statement | MRX | Hamblen | 38 min |
| May 4, 10:41 AM EDT | Severe Thunderstorm Warning | MRX | Blount, Jefferson, Knox, Sevier | 34 min |
| May 4, 10:45 AM EDT | Severe Thunderstorm Warning | MRX | Blount, Monroe | 30 min |
| May 4, 11:10 AM EDT | Severe Thunderstorm Warning | MRX | Cocke, Jefferson, Sevier | 22 min |
| May 4, 11:11 AM EDT | Flash Flood Warning | MRX | Hamilton, Marion, Sequatchie | 3 hr |
| May 4, 11:29 AM EDT | Areal Flood Warning | MRX | Blount, Sevier | 6 hr |
| May 4, 11:44 AM EDT | Areal Flood Advisory | MRX | Blount, Monroe | 2 hr |
| May 4, 11:47 AM EDT | Areal Flood Advisory | MRX | Blount, Sevier | 118 min |
| May 4, 12:06 PM EDT | 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.