Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 146, NWS Morristown, TN

December 11, 2021Marion County, Sequatchie County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Dec 11, 2021, 7:23 AM CST for Marion County, Sequatchie County, Tennessee. It was in force for 52 min. 2 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: Dec 11, 2021, 7:23 AM CST (13:23 UTC)
Expired: Dec 11, 2021, 8:15 AM CST
In force: 52 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Marion County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 61 km from the middle of the area, began a volume at 13:23 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
Dec 11, 8:00 AM CST	TSTM WND DMG	Jasper, TN	SEVERAL TREES DOWN.
Dec 11, 8:00 AM CST	TSTM WND DMG	South Pittsburg, TN	SEVERAL TREES DOWN.

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
Dec 11, 3:41 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 1.4 hours before the alert went out and 240 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 182 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 625 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 268 m²/s²
0-3 km storm-relative helicity: 271 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

949 
WUUS54 KMRX 111323
SVRMRX
TNC115-153-111415-
/O.NEW.KMRX.SV.W.0146.211211T1323Z-211211T1415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
723 AM CST Sat Dec 11 2021

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Sequatchie County in east Tennessee...
  Marion County in east Tennessee...

* Until 815 AM CST.

* At 722 AM CST, severe thunderstorms were located along a line
  extending from 10 miles northwest of Tracy City to 11 miles
  southeast of Huntland, moving east at 60 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Dunlap, Jasper, South Pittsburg, Whitwell, Kimball, Monteagle,
  Powells Crossroads, Orme, Martin Springs and Cartwright.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 AM CST for east
Tennessee.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3524 8582 3522 8574 3524 8569 3529 8571
      3532 8557 3535 8551 3541 8549 3541 8551
      3542 8551 3543 8554 3549 8554 3553 8560
      3555 8543 3549 8540 3539 8528 3498 8550
      3499 8586 3521 8586 3522 8587
TIME...MOT...LOC 1322Z 249DEG 51KT 3540 8585 3499 8608 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SR

1 follow-up statement

113 
WWUS54 KMRX 111350
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
750 AM CST Sat Dec 11 2021

TNC115-153-111415-
/O.CON.KMRX.SV.W.0146.000000T0000Z-211211T1415Z/
Sequatchie TN-Marion TN-
750 AM CST Sat Dec 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM CST
FOR SEQUATCHIE AND MARION COUNTIES...

At 750 AM CST, severe thunderstorms were located along a line
extending from 10 miles northwest of Dunlap to near Whitwell to near
South Pittsburg, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Dunlap, Jasper, South Pittsburg, Whitwell, Kimball, Monteagle,
Powells Crossroads, Orme, Martin Springs and Cartwright.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 AM CST for east
Tennessee.

For your protection move to an interior room on the lowest floor of a
building.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 3524 8582 3522 8574 3524 8569 3529 8571
      3532 8557 3535 8551 3541 8549 3541 8551
      3542 8551 3543 8554 3549 8554 3553 8560
      3555 8543 3549 8540 3539 8528 3498 8550
      3499 8586 3521 8586 3522 8587
TIME...MOT...LOC 1350Z 260DEG 42KT 3549 8551 3523 8555 3502 8582 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DGS

The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 11, 4:57 AM CST	Severe Thunderstorm Warning	MRX	Campbell, Scott	48 min
Dec 11, 5:39 AM CST	Severe Thunderstorm Warning	MRX	Campbell, Scott	51 min
Dec 11, 6:29 AM CST	Severe Thunderstorm Warning	MRX	Campbell, Scott	46 min
Dec 11, 6:43 AM CST	Flash Flood Warning	MRX	Scott	4 hr
Dec 11, 6:51 AM CST	Special Weather Statement	MRX	Campbell, Morgan	54 min
Dec 11, 7:23 AM CST	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Scott	37 min
Dec 11, 8:02 AM CST	Severe Thunderstorm Warning	MRX	Bledsoe, Bradley, Hamilton, McMinn, Meigs, Rhea and 1 more	43 min
Dec 11, 8:18 AM CST	Special Weather Statement	MRX	Hamilton	42 min
Dec 11, 8:18 AM CST	Severe Thunderstorm Warning	MRX	Bledsoe, Meigs, Rhea, Roane	42 min
Dec 11, 8:34 AM CST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Marion	41 min
Dec 11, 8:44 AM CST	Severe Thunderstorm Warning	MRX	Bradley, Loudon, McMinn, Meigs, Monroe, Roane	46 min
Dec 11, 8:51 AM CST	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Roane	39 min
Dec 11, 9:15 AM CST	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	45 min
Dec 11, 9:21 AM CST	Severe Thunderstorm Warning	MRX	Blount, Grainger, Jefferson, Knox, Sevier	39 min
Dec 11, 9:25 AM CST	Severe Thunderstorm Warning	MRX	Blount, Loudon, McMinn, Monroe	50 min
Dec 11, 9:30 AM CST	Special Weather Statement	MRX	Bradley	45 min
Dec 11, 9:53 AM CST	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson	35 min
Dec 11, 9:59 AM CST	Special Weather Statement	MRX	Polk	46 min
Dec 11, 9:59 AM CST	Severe Thunderstorm Warning	MRX	Blount, Cocke, Jefferson, Sevier	30 min
Dec 11, 10:28 AM CST	Special Weather Statement	MRX	Sullivan	47 min
Dec 11, 10:49 AM CST	Special Weather Statement	MRX	Carter, Johnson, Washington	41 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2021 Every 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.