Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 97, NWS Memphis, TN

April 9, 2021McNairy County, Tennessee

NWS Memphis, TN issued this severe thunderstorm warning at Apr 9, 2021, 8:45 PM CDT for McNairy County, Tennessee. It was in force for 17 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: Apr 9, 2021, 8:45 PM CDT (01:45 UTC)
Expired: Apr 9, 2021, 9:02 PM CDT
In force: 17 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County McNairy County, TN

The radar

The Memphis radar (KNQA), 120 km from the middle of the area, began a volume at 01:45 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 9, 3:42 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 1.8 hours before the alert went out and 128 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2032 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 326 m²/s²
0-3 km storm-relative helicity: 590 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

772 
WUUS54 KMEG 100145
SVRMEG
TNC109-100230-
/O.NEW.KMEG.SV.W.0097.210410T0145Z-210410T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Memphis TN
845 PM CDT Fri Apr 9 2021

The National Weather Service in Memphis has issued a

* Severe Thunderstorm Warning for...
  McNairy County in western Tennessee...

* Until 930 PM CDT.

* At 845 PM CDT, a severe thunderstorm was located over Big Hill Pond
  State Park, moving northeast at 20 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Selmer, Big Hill Pond State Park, Bethel Springs, Eastview, Michie,
  Guys, Ramer, Stantonville, Forty Forks, Mount Vinson, New Lawton,
  Martin Camp, Rose Creek, Good Hope, Pebble Hill, Caffey, Old
  Lawton, Gilchrist, West Shihloh and Cypress.

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 3499 8859 3500 8878 3513 8879 3536 8859
      3518 8837 3512 8837
TIME...MOT...LOC 0145Z 228DEG 17KT 3504 8872 

HAIL...1.50IN
WIND...60MPH
 
$$

SJM

2 follow-up statements

257 
WWUS54 KMEG 100155
SVSMEG

Severe Weather Statement
National Weather Service Memphis TN
855 PM CDT Fri Apr 9 2021

TNC109-100230-
/O.CON.KMEG.SV.W.0097.000000T0000Z-210410T0230Z/
McNairy TN-
855 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR MCNAIRY COUNTY...

At 855 PM CDT, a severe thunderstorm was located over Selmer, moving
northeast at 35 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...
Selmer, Big Hill Pond State Park, Bethel Springs, Eastview, Michie,
Guys, Ramer, Stantonville, Forty Forks, Mount Vinson, New Lawton,
Martin Camp, Rose Creek, Good Hope, Pebble Hill, Caffey, Old Lawton,
Gilchrist, West Shihloh and Cypress.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3499 8859 3500 8878 3513 8879 3536 8859
      3518 8837 3512 8837
TIME...MOT...LOC 0155Z 224DEG 29KT 3516 8859 

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

SJM

341 
WWUS54 KMEG 100202
SVSMEG

Severe Weather Statement
National Weather Service Memphis TN
902 PM CDT Fri Apr 9 2021

TNC109-100212-
/O.CAN.KMEG.SV.W.0097.000000T0000Z-210410T0230Z/
McNairy TN-
902 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR MCNAIRY COUNTY 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.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northeastern Mississippi...and western Tennessee.

LAT...LON 3499 8859 3500 8878 3513 8879 3536 8859
      3518 8837 3512 8837
TIME...MOT...LOC 0200Z 228DEG 17KT 3519 8855 

$$

SJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:05 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Hardeman, McNairy	40 min
Apr 9, 7:41 PM CDT	Areal Flood Advisory	MEG	Crockett, Haywood, Madison	2 hr
Apr 9, 7:41 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Hardin, Henderson, McNairy	17 min
Apr 9, 8:01 PM CDT	Severe Thunderstorm Warning	MEG	Hardin, McNairy	44 min
Apr 9, 8:21 PM CDT	Areal Flood Advisory	MEG	Chester, Hardeman, McNairy	88 min
Apr 9, 8:38 PM CDT	Areal Flood Advisory	MEG	Hardin, McNairy	3 hr
Apr 9, 9:59 PM CDT	Special Weather Statement	MEG	Chester, McNairy	31 min
Apr 10, 12:38 PM CDT	River Flood Advisory	MEG	Dyer, Lake, Lauderdale	56 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.