Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 71, NWS Jackson, MS

April 7, 2021Concordia Parish, Louisiana; Adams County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Apr 7, 2021, 9:43 PM CDT for Concordia Parish, Louisiana; Adams County, Mississippi. It was in force for 47 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 7, 2021, 9:43 PM CDT (02:43 UTC)
Expired: Apr 7, 2021, 10:30 PM CDT
In force: 47 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

Counties Concordia Parish, LA, Adams County, MS

The radar

The Ft Polk radar (KPOE), 127 km from the middle of the area, began a volume at 02:42 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.7 hours before the alert went out and 187 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: 1905 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 549 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 204 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 12.6

Open this sounding in Storm Lab

The text

As transmitted.

978 
WUUS54 KJAN 080243
SVRJAN
LAC029-MSC001-080330-
/O.NEW.KJAN.SV.W.0071.210408T0243Z-210408T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jackson MS
943 PM CDT Wed Apr 7 2021

The National Weather Service in Jackson has issued a

* Severe Thunderstorm Warning for...
  Southwestern Concordia Parish in northeastern Louisiana...
  Southwestern Adams County in southwestern Mississippi...

* Until 1030 PM CDT.

* At 943 PM CDT, a severe thunderstorm was located near Marksville,
  moving east at 40 mph.

  HAZARD...60 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Black Hawk around 1015 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3098 9166 3104 9165 3104 9172 3110 9170
      3114 9172 3116 9168 3119 9168 3121 9170
      3120 9173 3123 9179 3127 9183 3126 9148
      3123 9149 3121 9153 3124 9156 3122 9158
      3113 9163 3111 9163 3107 9157 3104 9157
TIME...MOT...LOC 0243Z 273DEG 34KT 3113 9199 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

TW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 7:09 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse	66 min
Apr 7, 7:28 PM CDT	Tornado Warning	JAN	Morehouse	47 min
Apr 7, 8:05 PM CDT	Tornado Warning	JAN	East Carroll, West Carroll	55 min
Apr 7, 10:18 PM CDT	Tornado Warning	JAN	Concordia	31 min
Apr 8, 6:11 AM CDT	Dense Fog Advisory	JAN	Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more	3 hr
Apr 8, 10:57 AM CDT	River Flood Warning	JAN	East Carroll	5 days
Apr 7, 8:41 PM CDT	Special Weather Statement	JAN	Attala	64 min
Apr 7, 8:49 PM CDT	Tornado Warning	JAN	Humphreys, Issaquena, Sharkey, Sunflower, Washington	56 min
Apr 7, 9:24 PM CDT	Severe Thunderstorm Warning	JAN	Carroll, Holmes, Humphreys, Leflore	40 min
Apr 8, 10:47 AM CDT	River Flood Warning	JAN	Madison, Yazoo	11 days
Apr 8, 10:47 AM CDT	River Flood Warning	JAN	Hinds, Warren	11 days
Apr 8, 10:49 AM CDT	River Flood Warning	JAN	Carroll, Leflore	47 hr
Apr 8, 10:54 AM CDT	River Flood Warning	JAN	Bolivar, Washington	50 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.