Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 180, NWS Memphis, TN

July 31, 2021Decatur County, Henderson County, Tennessee

NWS Memphis, TN issued this severe thunderstorm warning at Jul 31, 2021, 11:29 PM CDT for Decatur County, Henderson County, Tennessee. It was in force for 16 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 31, 2021, 11:29 PM CDT (04:29 UTC)
Expired: Jul 31, 2021, 11:45 PM CDT
In force: 16 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Decatur County, TN, Henderson County, TN

The radar

The Ft Campbell radar (KHPX), 140 km from the middle of the area, began a volume at 04:32 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 4.5 hours before the alert went out and 145 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.

627 
WUUS54 KMEG 010429
SVRMEG
TNC039-077-010445-
/O.NEW.KMEG.SV.W.0180.210801T0429Z-210801T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Memphis TN
1129 PM CDT Sat Jul 31 2021

The National Weather Service in Memphis has issued a

* Severe Thunderstorm Warning for...
  Northeastern Henderson County in western Tennessee...
  Central Decatur County in western Tennessee...

* Until 1145 PM CDT.

* At 1129 PM CDT, a severe thunderstorm was located near Parsons, or
  10 miles west of Linden, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Natchez Trace State Park, Natchez Trace State Forest, Parsons,
  Decaturville, Darden, Perryville, Busseltown, Wilkinstown, Mount
  Tabor, Garrett, Beacon, Hickory Forks, Bible Hill, Mount Lebanon
  and Chesterfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3567 8836 3577 8833 3575 8801 3572 8803
      3570 8803 3568 8802 3566 8802 3562 8804
      3556 8800 3552 8797
TIME...MOT...LOC 0429Z 292DEG 36KT 3565 8803 

HAIL...<.75IN
WIND...60MPH
 
$$

1 follow-up statement

037 
WWUS54 KMEG 010436
SVSMEG

Severe Weather Statement
National Weather Service Memphis TN
1136 PM CDT Sat Jul 31 2021

TNC039-077-010446-
/O.EXP.KMEG.SV.W.0180.000000T0000Z-210801T0445Z/
Henderson TN-Decatur TN-
1136 PM CDT Sat Jul 31 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HENDERSON AND
CENTRAL DECATUR COUNTIES WILL EXPIRE AT 1145 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3567 8836 3577 8833 3575 8801 3572 8803
      3570 8803 3568 8802 3566 8802 3562 8804
      3556 8800 3552 8797
TIME...MOT...LOC 0436Z 292DEG 36KT 3563 8796 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:40 PM CDT	Special Weather Statement	MEG	Lake	35 min
Jul 31, 8:57 PM CDT	Severe Thunderstorm Warning	MEG	Lauderdale	48 min
Jul 31, 9:09 PM CDT	Special Weather Statement	MEG	Henry, Weakley	36 min
Jul 31, 9:26 PM CDT	Severe Thunderstorm Warning	MEG	Crockett, Dyer, Haywood, Lauderdale	49 min
Jul 31, 9:44 PM CDT	Special Weather Statement	MEG	Lauderdale	31 min
Jul 31, 9:58 PM CDT	Special Weather Statement	MEG	Crockett	32 min
Jul 31, 10:05 PM CDT	Special Weather Statement	MEG	Gibson	25 min
Jul 31, 10:23 PM CDT	Areal Flood Advisory	MEG	Gibson, Madison	52 min
Jul 31, 10:25 PM CDT	Special Weather Statement	MEG	Carroll, Gibson	35 min
Jul 31, 10:31 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Carroll, Decatur, Gibson, Henderson, Madison	44 min
Jul 31, 10:33 PM CDT	Special Weather Statement	MEG	Chester, Madison	27 min
Jul 31, 10:48 PM CDT	Tornado Warning	MEG	Benton, Carroll, Decatur, Henderson	42 min
Jul 31, 11:03 PM CDT	Special Weather Statement	MEG	Hardin	27 min
Jul 31, 11:05 PM CDT	Special Weather Statement	MEG	Dyer	25 min
Jul 31, 11:07 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Decatur, Hardin, Henderson, McNairy	23 min
Jul 31, 11:12 PM CDT	Severe Thunderstorm Warning	MEG	Decatur, Henderson	18 min
Jul 31, 11:31 PM CDT	Special Weather Statement	MEG	Decatur	14 min
Aug 1, 4:42 AM CDT	Areal Flood Advisory	MEG	Hardin	2 hr
Aug 1, 8:33 AM CDT	Special Weather Statement	MEG	McNairy	57 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.