Alert archive / Mississippi / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Memphis, TN

March 17, 20214 counties in Mississippi

NWS Memphis, TN issued this severe thunderstorm warning at Mar 17, 2021, 4:43 PM CDT for 4 counties in Mississippi. It was in force for 32 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
Mar 17, 2021, 4:43 PM CDT (21:43 UTC)
Expired
Mar 17, 2021, 5:15 PM CDT
In force
32 min
Issued by
NWS Memphis, TN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Benton County, MS, Lafayette County, MS, Marshall County, MS, Union County, MS

The radar

The Columbus AFB radar (KGWX), 102 km from the middle of the area, began a volume at 21:44 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.

IssuedProductOfficeLasted
Mar 17, 12:57 PM CDTTornado Watch PDSSPC6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 9.7 hours before the alert went out and 79 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-pSkew-T log-p diagram, Little Rock, AR at 12:00Z on 2021-03-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2021-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 217 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

632 
WUUS54 KMEG 172143
SVRMEG
MSC009-071-093-145-172215-
/O.NEW.KMEG.SV.W.0020.210317T2143Z-210317T2215Z/

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

The National Weather Service in Memphis has issued a

* Severe Thunderstorm Warning for...
  Northeastern Lafayette County in northwestern Mississippi...
  Western Union County in northeastern Mississippi...
  Southeastern Marshall County in northwestern Mississippi...
  South central Benton County in northeastern Mississippi...

* Until 515 PM CDT.

* At 442 PM CDT, a severe thunderstorm was located near Cambridge, or
  12 miles east of Oxford, moving northeast at 30 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...
  New Albany, Cambridge, Denmark, Pinedale, Etta, Hickory Flat,
  Myrtle, Shari, Altus, Keel, Poolville, Martintown, Old Myrtle,
  Burt, Pumpkin Center, Lafayette Springs, Cornersville, Smalco,
  Glenfield and Winborn.

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3436 8946 3468 8923 3452 8895 3438 8915
      3438 8924 3431 8925 3428 8929
TIME...MOT...LOC 2142Z 211DEG 27KT 3441 8931 

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

MJH
1 follow-up statement
605 
WWUS54 KMEG 172209
SVSMEG

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

MSC009-071-093-145-172218-
/O.EXP.KMEG.SV.W.0020.000000T0000Z-210317T2215Z/
Lafayette MS-Union MS-Marshall MS-Benton MS-
509 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LAFAYETTE...
WESTERN UNION...SOUTHEASTERN MARSHALL AND SOUTH CENTRAL BENTON
COUNTIES WILL EXPIRE AT 515 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However heavy rain is still possible with this
thunderstorm.

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

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Memphis.

LAT...LON 3436 8946 3468 8923 3452 8895 3438 8915
      3438 8924 3431 8925 3428 8929
TIME...MOT...LOC 2208Z 211DEG 27KT 3457 8920 

$$

MJH

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 17, 3:38 AM CDTSevere Thunderstorm WarningMEGCalhoun, Lafayette, Pontotoc, Yalobusha37 min
Mar 17, 5:24 AM CDTSevere Thunderstorm WarningMEGPanola, Tate20 min
Mar 17, 6:35 AM CDTSevere Thunderstorm WarningMEGCoahoma, Panola, Quitman, Tallahatchie, Tunica40 min
Mar 17, 6:49 AM CDTSevere Thunderstorm WarningMEGMarshall14 min
Mar 17, 7:12 AM CDTSevere Thunderstorm WarningMEGLafayette, Marshall, Panola, Quitman, Tallahatchie, Tate and 1 more48 min
Mar 17, 8:24 AM CDTAreal Flood AdvisoryMEGBenton, DeSoto, Marshall, Tate, Tunica2 hr
Mar 17, 9:04 AM CDTFlash Flood WarningMEGAlcorn, Benton, DeSoto, Marshall, Tate, Tippah3 hr
Mar 17, 10:29 AM CDTFlash Flood WarningMEGAlcorn, Prentiss, Tishomingo3 hr
Mar 17, 3:18 PM CDTTornado WarningMEGItawamba, Prentiss, Tishomingo27 min
Mar 17, 4:17 PM CDTSevere Thunderstorm WarningMEGCalhoun, Lafayette, Pontotoc, Union28 min
Mar 17, 4:28 PM CDTAreal Flood AdvisoryMEGItawamba, Prentiss, Tishomingo5 hr
Mar 17, 4:52 PM CDTFlash Flood WarningMEGItawamba, Lee, Prentiss, Tishomingo4 hr
Mar 17, 4:56 PM CDTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Lee, Pontotoc, Prentiss, Union49 min
Mar 17, 4:58 PM CDTSevere Thunderstorm WarningMEGCalhoun, Chickasaw, Pontotoc20 min
Mar 17, 5:45 PM CDTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Lee, Monroe45 min
Mar 17, 5:55 PM CDTFlash Flood WarningMEGCalhoun, Chickasaw4 hr
Mar 17, 5:55 PM CDTTornado WarningMEGChickasaw, Itawamba, Lee, Monroe35 min
Mar 17, 6:28 PM CDTSevere Thunderstorm WarningMEGItawamba, Monroe47 min
Mar 17, 6:33 PM CDTSpecial Weather StatementMEGLafayette, Marshall, Yalobusha42 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2021Every 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.