Alert archive / Mississippi / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 251, NWS Jackson, MS

August 11, 2021Choctaw County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Aug 11, 2021, 6:59 PM CDT for Choctaw County, Mississippi. It was in force for 46 min. 1 report 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: Aug 11, 2021, 6:59 PM CDT (23:59 UTC)
Expired: Aug 11, 2021, 7:45 PM CDT
In force: 46 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Choctaw County, MS

The radar

The Columbus AFB radar (KGWX), 94 km from the middle of the area, began a volume at 00:05 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
Aug 11, 7:13 PM CDT	TSTM WND DMG	3 Ene Chester, MS	A LARGE TREE WAS BLOWN DOWN NORTH OF ACKERMAN NEAR MS HIGHWAY 9.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 12.0 hours before the alert went out and 150 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: 1448 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1031 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: -5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

422 
WUUS54 KJAN 112359
SVRJAN
MSC019-120045-
/O.NEW.KJAN.SV.W.0251.210811T2359Z-210812T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jackson MS
659 PM CDT Wed Aug 11 2021

The National Weather Service in Jackson has issued a

* Severe Thunderstorm Warning for...
  Northeastern Choctaw County in central Mississippi...

* Until 745 PM CDT.

* At 659 PM CDT, a severe thunderstorm was located over Chester, or
  21 miles northwest of Louisville, and is nearly stationary.

  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.

* This severe thunderstorm will be near...
  Chester around 720 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3352 8909 3339 8909 3328 8927 3345 8935
TIME...MOT...LOC 2359Z 071DEG 4KT 3340 8922 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

TW

1 follow-up statement

955 
WWUS54 KJAN 120035
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
735 PM CDT Wed Aug 11 2021

MSC019-120045-
/O.EXP.KJAN.SV.W.0251.000000T0000Z-210812T0045Z/
Choctaw MS-
735 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHOCTAW COUNTY
WILL EXPIRE AT 745 PM CDT...
                
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 will be allowed to expire.

LAT...LON 3352 8909 3339 8909 3328 8927 3345 8935
TIME...MOT...LOC 0035Z 071DEG 4KT 3339 8926 

$$

TW

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 2:16 PM CDT	Special Weather Statement	JAN	Clarke	29 min
Aug 11, 3:01 PM CDT	Special Weather Statement	JAN	Jones	29 min
Aug 11, 3:24 PM CDT	Special Weather Statement	JAN	Jones	51 min
Aug 11, 3:32 PM CDT	Special Weather Statement	JAN	Jasper	43 min
Aug 11, 3:53 PM CDT	Special Weather Statement	JAN	Lowndes	67 min
Aug 11, 4:05 PM CDT	Severe Thunderstorm Warning	JAN	Jasper	37 min
Aug 11, 4:32 PM CDT	Special Weather Statement	JAN	Smith	28 min
Aug 11, 4:36 PM CDT	Special Weather Statement	JAN	Simpson	24 min
Aug 11, 4:46 PM CDT	Special Weather Statement	JAN	Simpson	29 min
Aug 11, 4:46 PM CDT	Special Weather Statement	JAN	Smith	29 min
Aug 11, 4:47 PM CDT	Special Weather Statement	JAN	Kemper	28 min
Aug 11, 5:18 PM CDT	Special Weather Statement	JAN	Rankin	42 min
Aug 11, 5:22 PM CDT	Special Weather Statement	JAN	Oktibbeha	38 min
Aug 11, 5:49 PM CDT	Special Weather Statement	JAN	Noxubee	26 min
Aug 11, 5:50 PM CDT	Special Weather Statement	JAN	Noxubee	25 min
Aug 11, 6:49 PM CDT	Special Weather Statement	JAN	Choctaw	26 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.