Alert archive / Mississippi / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Memphis, TN

March 17, 2021Calhoun County, Chickasaw County, Pontotoc County, Mississippi

NWS Memphis, TN issued this severe thunderstorm warning at Mar 17, 2021, 4:58 PM CDT for Calhoun County, Chickasaw County, Pontotoc County, Mississippi. 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: Mar 17, 2021, 4:58 PM CDT (21:58 UTC)
Expired: Mar 17, 2021, 5:18 PM CDT
In force: 20 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calhoun County, MS, Chickasaw County, MS, Pontotoc County, MS

The radar

The Columbus AFB radar (KGWX), 91 km from the middle of the area, began a volume at 21:58 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 17, 5:06 PM CDT	HAIL 0.75	1 E New Houlka, MS	PENNY SIZE AND SMALLER HAIL AT DAVIS LAKE AREA.
Mar 17, 5:06 PM CDT	HAIL 0.75	New Houlka, MS	PENNY SIZE AND SMALLER HAIL.

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
Mar 17, 12:57 PM CDT	Tornado Watch PDS	SPC	6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 10.0 hours before the alert went out and 123 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: 18 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1466 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

660 
WUUS54 KMEG 172158
SVRMEG
MSC013-017-115-172245-
/O.NEW.KMEG.SV.W.0022.210317T2158Z-210317T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Memphis TN
458 PM CDT Wed Mar 17 2021

The National Weather Service in Memphis has issued a

* Severe Thunderstorm Warning for...
  Northwestern Chickasaw County in northeastern Mississippi...
  Calhoun County in northeastern Mississippi...
  Southwestern Pontotoc County in northeastern Mississippi...

* Until 545 PM CDT.

* At 458 PM CDT, a severe thunderstorm was located over Slate
  Springs, or 23 miles east of Grenada, moving northeast at 40 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...
  Bruce, Calhoun City, Vardaman, Derma, Pittsboro, Slate Springs,
  Sabougla, Pyland, Houlka, New Houlka, Big Creek, Robbs, Thorn,
  Reid, Loyd, Thelma, Matthews, Atlanta, Dentontown and Slate Spring.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM CDT for northeastern
and northwestern Mississippi.

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

&&

LAT...LON 3374 8951 3419 8923 3401 8892 3372 8923
      3372 8951
TIME...MOT...LOC 2158Z 212DEG 36KT 3372 8940 

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

1 follow-up statement

173 
WWUS54 KMEG 172218
SVSMEG

Severe Weather Statement
National Weather Service Memphis TN
518 PM CDT Wed Mar 17 2021

MSC013-017-115-172227-
/O.CAN.KMEG.SV.W.0022.000000T0000Z-210317T2245Z/
Chickasaw MS-Calhoun MS-Pontotoc MS-
518 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CHICKASAW...
CALHOUN AND SOUTHWESTERN PONTOTOC 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 small hail is
still possible with this thunderstorm.

A Tornado Watch remains in effect until 700 PM CDT for northeastern
and northwestern Mississippi.

LAT...LON 3374 8951 3419 8923 3401 8892 3372 8923
      3372 8951
TIME...MOT...LOC 2216Z 212DEG 36KT 3389 8927 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 3:38 AM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Lafayette, Pontotoc, Yalobusha	37 min
Mar 17, 5:24 AM CDT	Severe Thunderstorm Warning	MEG	Panola, Tate	20 min
Mar 17, 6:35 AM CDT	Severe Thunderstorm Warning	MEG	Coahoma, Panola, Quitman, Tallahatchie, Tunica	40 min
Mar 17, 6:49 AM CDT	Severe Thunderstorm Warning	MEG	Marshall	14 min
Mar 17, 7:12 AM CDT	Severe Thunderstorm Warning	MEG	Lafayette, Marshall, Panola, Quitman, Tallahatchie, Tate and 1 more	48 min
Mar 17, 8:24 AM CDT	Areal Flood Advisory	MEG	Benton, DeSoto, Marshall, Tate, Tunica	2 hr
Mar 17, 9:04 AM CDT	Flash Flood Warning	MEG	Alcorn, Benton, DeSoto, Marshall, Tate, Tippah	3 hr
Mar 17, 10:29 AM CDT	Flash Flood Warning	MEG	Alcorn, Prentiss, Tishomingo	3 hr
Mar 17, 3:18 PM CDT	Tornado Warning	MEG	Itawamba, Prentiss, Tishomingo	27 min
Mar 17, 4:17 PM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Lafayette, Pontotoc, Union	28 min
Mar 17, 4:28 PM CDT	Areal Flood Advisory	MEG	Itawamba, Prentiss, Tishomingo	5 hr
Mar 17, 4:43 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Lafayette, Marshall, Union	32 min
Mar 17, 4:52 PM CDT	Flash Flood Warning	MEG	Itawamba, Lee, Prentiss, Tishomingo	4 hr
Mar 17, 4:56 PM CDT	Severe Thunderstorm Warning	MEG	Chickasaw, Itawamba, Lee, Pontotoc, Prentiss, Union	49 min
Mar 17, 5:45 PM CDT	Severe Thunderstorm Warning	MEG	Chickasaw, Itawamba, Lee, Monroe	45 min
Mar 17, 5:55 PM CDT	Flash Flood Warning	MEG	Calhoun, Chickasaw	4 hr
Mar 17, 5:55 PM CDT	Tornado Warning	MEG	Chickasaw, Itawamba, Lee, Monroe	35 min
Mar 17, 6:28 PM CDT	Severe Thunderstorm Warning	MEG	Itawamba, Monroe	47 min
Mar 17, 6:33 PM CDT	Special Weather Statement	MEG	Lafayette, Marshall, Yalobusha	42 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 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.