Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 116, NWS Nashville, TN

July 31, 2021Cheatham County, Dickson County, Montgomery County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jul 31, 2021, 7:27 PM CDT for Cheatham County, Dickson County, Montgomery County, Tennessee. It was in force for 20 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: Jul 31, 2021, 7:27 PM CDT (00:27 UTC)
Expired: Jul 31, 2021, 7:47 PM CDT
In force: 20 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cheatham County, TN, Dickson County, TN, Montgomery County, TN

The radar

The Ft Campbell radar (KHPX), 44 km from the middle of the area, began a volume at 00:26 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
Jul 31, 7:32 PM CDT	TSTM WND DMG	10 Sse Clarksville, TN	A FEW TREES DOWN IN THE SOUTHEASTERN PORTION OF THE COUNTY.
Jul 31, 7:40 PM CDT	TSTM WND DMG	3 Wsw Ashland City, TN	TREES AND POWERLINES DOWN ALONG HWY 49.

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, 0.5 hours before the alert went out and 52 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: 1106 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1447 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

As transmitted.

608 
WUUS54 KOHX 010027
SVROHX
TNC021-043-125-010100-
/O.NEW.KOHX.SV.W.0116.210801T0027Z-210801T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Nashville TN
727 PM CDT Sat Jul 31 2021

The National Weather Service in Nashville has issued a

* Severe Thunderstorm Warning for...
  Northeastern Dickson County in Middle Tennessee...
  Southeastern Montgomery County in Middle Tennessee...
  Northern Cheatham County in Middle Tennessee...

* Until 800 PM CDT.

* At 726 PM CDT, a severe thunderstorm was located 8 miles south of
  Clarksville, moving southeast at 25 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Ashland City, Clarksville, Coopertown, Pleasant View, Cunningham
  and Cheatham Dam.

This includes Interstate 24 near mile marker 26, and between mile
markers 29 and 30.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3639 8700 3637 8699 3637 8697 3638 8697
      3636 8693 3617 8715 3644 8744 3653 8734
TIME...MOT...LOC 0026Z 309DEG 20KT 3644 8733 

HAIL...0.75IN
WIND...60MPH
 
$$

Shamburger

1 follow-up statement

362 
WWUS54 KOHX 010047
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
747 PM CDT Sat Jul 31 2021

TNC021-043-125-010057-
/O.CAN.KOHX.SV.W.0116.000000T0000Z-210801T0100Z/
Dickson TN-Montgomery TN-Cheatham TN-
747 PM CDT Sat Jul 31 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DICKSON...
SOUTHEASTERN MONTGOMERY AND NORTHERN CHEATHAM 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 gusty winds are
still possible with this thunderstorm.

LAT...LON 3639 8700 3637 8699 3637 8697 3638 8697
      3636 8693 3617 8715 3644 8744 3653 8734
TIME...MOT...LOC 0042Z 309DEG 20KT 3637 8722 

$$

Shamburger

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 7:03 PM CDT	Severe Thunderstorm Warning	OHX	Robertson	27 min
Jul 31, 7:07 PM CDT	Special Weather Statement	OHX	Robertson	23 min
Jul 31, 7:31 PM CDT	Special Weather Statement	OHX	Davidson, Robertson	44 min
Jul 31, 7:41 PM CDT	Special Weather Statement	OHX	Robertson	34 min
Jul 31, 7:51 PM CDT	Special Weather Statement	OHX	Cheatham, Davidson	39 min
Jul 31, 7:58 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Wilson	47 min
Jul 31, 8:05 PM CDT	Special Weather Statement	OHX	Sumner, Trousdale	40 min
Jul 31, 8:24 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Williamson	36 min
Jul 31, 8:47 PM CDT	Areal Flood Advisory	OHX	Robertson	4 hr
Jul 31, 8:57 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson	33 min
Jul 31, 9:10 PM CDT	Severe Thunderstorm Warning	OHX	Houston, Montgomery, Stewart	50 min
Jul 31, 9:16 PM CDT	Special Weather Statement	OHX	Davidson	59 min
Jul 31, 9:48 PM CDT	Special Weather Statement	OHX	Cheatham, Dickson	27 min
Jul 31, 9:53 PM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Robertson, Sumner	3 hr
Jul 31, 9:57 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Hickman, Montgomery, Williamson	33 min
Jul 31, 10:19 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Marshall, Maury, Williamson	41 min
Jul 31, 10:24 PM CDT	Flash Flood Warning	OHX	Cheatham, Davidson, Williamson	4 hr
Jul 31, 10:52 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Maury, Rutherford, Williamson	38 min
Jul 31, 10:55 PM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Wilson	16 min
Jul 31, 11:10 PM CDT	Flash Flood Warning	OHX	Davidson, Rutherford, Wilson	3 hr
Jul 31, 11:24 PM CDT	Severe Thunderstorm Warning	OHX	Lewis, Perry, Wayne	36 min
Jul 31, 11:26 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Marshall, Rutherford, Warren	34 min
Jul 31, 11:36 PM CDT	River Flood Warning	OHX	Davidson	3 hr
Jul 31, 11:41 PM CDT	River Flood Advisory	OHX	Davidson	3 hr
Jul 31, 11:55 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Grundy, Rutherford, Van Buren and 1 more	53 min
Aug 1, 2:40 AM CDT	Special Weather Statement	OHX	Wayne	50 min
Aug 1, 3:43 AM CDT	Special Weather Statement	OHX	Wayne	47 min
Aug 1, 4:29 AM CDT	Special Weather Statement	OHX	Lawrence, Wayne	46 min
Aug 1, 6:47 AM CDT	Special Weather Statement	OHX	Giles, Lawrence	43 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.