Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 4, NWS Morristown, TN

March 25, 2021Hamilton County, Marion County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Mar 25, 2021, 10:53 AM EDT for Hamilton County, Marion County, Tennessee. It was in force for 33 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: Mar 25, 2021, 10:53 AM EDT (14:53 UTC)
Expired: Mar 25, 2021, 11:26 AM EDT
In force: 33 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hamilton County, TN, Marion County, TN

The radar

The Northeast Alabama radar (KHTX), 93 km from the middle of the area, began a volume at 14:53 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
Mar 25, 11:03 AM EDT	HAIL 0.25	3 Ssw Chattanooga, 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 12:00Z, 2.9 hours before the alert went out and 169 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: 60 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 753 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

331 
WUUS54 KMRX 251453
SVRMRX
TNC065-115-251600-
/O.NEW.KMRX.SV.W.0004.210325T1453Z-210325T1600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
1053 AM EDT Thu Mar 25 2021

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Southeastern Marion County in east Tennessee...
  Hamilton County in east Tennessee...

* Until noon EDT/1100 AM CDT/.

* At 1053 AM EDT/953 AM CDT/, severe thunderstorms were located along
  a line extending from Signal Mountain to 7 miles southeast of
  Trenton to Little River Falls, moving northeast at 70 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...
  Chattanooga, Soddy-Daisy, Signal Mountain, Walden, Lakesite,
  Ridgeside, Fairmount, Harrison, Red Bank and Collegedale.

This includes Interstate 75 in Tennessee between mile markers 1 and
15.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3499 8551 3511 8548 3516 8539 3515 8539
      3542 8503 3541 8502 3538 8503 3537 8502
      3538 8500 3536 8497 3531 8497 3528 8494
      3526 8497 3514 8503 3508 8500 3504 8500
      3502 8496 3499 8497
TIME...MOT...LOC 1453Z 227DEG 63KT 3514 8536 3477 8545 3440 8565 

HAIL...1.00IN
WIND...60MPH
 
$$

JLB

3 follow-up statements

690 
WWUS54 KMRX 251502
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1102 AM EDT Thu Mar 25 2021

TNC115-251512-
/O.CAN.KMRX.SV.W.0004.000000T0000Z-210325T1600Z/
Marion TN-
1102 AM EDT Thu Mar 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARION COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3499 8546 3507 8536 3509 8536 3511 8539
      3515 8538 3542 8503 3538 8503 3537 8502
      3538 8500 3536 8497 3531 8497 3528 8494
      3526 8497 3514 8503 3508 8500 3504 8500
      3502 8496 3499 8497
TIME...MOT...LOC 1502Z 227DEG 63KT 3524 8523 3487 8532 3450 8552 

$$

TNC065-251600-
/O.CON.KMRX.SV.W.0004.000000T0000Z-210325T1600Z/
Hamilton TN-
1102 AM EDT Thu Mar 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON EDT FOR
HAMILTON COUNTY...

At 1102 AM EDT, severe thunderstorms were located along a line
extending from near Soddy-Daisy to Chickamauga to 9 miles northeast
of Little River Falls, moving northeast at 70 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...
Chattanooga, Soddy-Daisy, Signal Mountain, Walden, Lakesite,
Ridgeside, Fairmount, Harrison, Red Bank and Collegedale.

This includes Interstate 75 in Tennessee between mile markers 1 and
15.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3499 8546 3507 8536 3509 8536 3511 8539
      3515 8538 3542 8503 3538 8503 3537 8502
      3538 8500 3536 8497 3531 8497 3528 8494
      3526 8497 3514 8503 3508 8500 3504 8500
      3502 8496 3499 8497
TIME...MOT...LOC 1502Z 227DEG 63KT 3524 8523 3487 8532 3450 8552 

HAIL...1.00IN
WIND...60MPH
 
$$

JLB

615 
WWUS54 KMRX 251512
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1112 AM EDT Thu Mar 25 2021

TNC065-251600-
/O.CON.KMRX.SV.W.0004.000000T0000Z-210325T1600Z/
Hamilton TN-
1112 AM EDT Thu Mar 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON EDT FOR
SOUTHEASTERN HAMILTON COUNTY...

At 1112 AM EDT, severe thunderstorms were located along a line
extending from near Harrison to near Chickamauga to near Trion,
moving northeast at 70 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...
Chattanooga, Harrison, Collegedale, East Brainerd, Harrison Bay State
Park, Apison, Ooltewah and East Ridge.

This includes Interstate 75 in Tennessee between mile markers 1 and
15.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3499 8523 3503 8520 3512 8518 3531 8497
      3528 8494 3526 8497 3514 8503 3508 8500
      3504 8500 3502 8496 3499 8497
TIME...MOT...LOC 1512Z 225DEG 62KT 3515 8510 3485 8522 3461 8538 

HAIL...1.00IN
WIND...60MPH
 
$$

JLB

043 
WWUS54 KMRX 251526
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1126 AM EDT Thu Mar 25 2021

TNC065-251536-
/O.CAN.KMRX.SV.W.0004.000000T0000Z-210325T1600Z/
Hamilton TN-
1126 AM EDT Thu Mar 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HAMILTON COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3499 8523 3503 8520 3512 8518 3531 8497
      3528 8494 3526 8497 3514 8503 3508 8500
      3504 8500 3502 8496 3499 8497
TIME...MOT...LOC 1524Z 227DEG 63KT 3530 8490 3500 8502 3476 8518 

$$

JLB

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 25, 3:41 AM EDT	Wind Advisory	MRX	Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 25 more	24 hr
Mar 25, 10:22 AM EDT	River Flood Warning	MRX	Bledsoe, Marion, Sequatchie	4 days
Mar 25, 11:20 AM EDT	Special Weather Statement	MRX	Bradley, Polk	40 min
Mar 25, 1:03 PM EDT	Flash Flood Warning	MRX	Bradley, Hamilton, Marion, Sequatchie	3 hr
Mar 25, 2:28 PM EDT	Areal Flood Advisory	MRX	Polk	3 hr
Mar 25, 2:52 PM EDT	River Flood Warning	MRX	Hamilton	41 hr
Mar 25, 4:06 PM EDT	Areal Flood Advisory	MRX	Bradley, Hamilton, Marion, Sequatchie	86 min
Mar 25, 4:14 PM EDT	Special Weather Statement	MRX	Bledsoe	31 min
Mar 25, 5:27 PM EDT	Flash Flood Warning	MRX	Bradley, Hamilton, Marion, Sequatchie	4 hr
Mar 25, 6:17 PM EDT	Areal Flood Advisory	MRX	Knox, Loudon	3 hr
Mar 25, 7:17 PM EDT	River Flood Warning	MRX	Cocke	32 hr
Mar 25, 7:57 PM EDT	Areal Flood Advisory	MRX	Polk	4 hr

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.