Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 307

March 23, 2013Ashley County, Chicot County, Arkansas; 18 parishes in Louisiana; 34 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2013, 5:01 PM CDT for Ashley County, Chicot County, Arkansas; 18 parishes in Louisiana; 34 counties in Mississippi. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Mar 23, 2013, 5:01 PM CDT (22:01 UTC)
Expired: Mar 23, 2013, 7:00 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 54 counties

Ashley County, AR, Chicot County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 67 km from the middle of the area, began a volume at 22:02 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 10.0 hours before the alert went out and 57 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: -308 J/kg
Mixed-layer LCL: 445 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 250 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 22, 8:16 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 7 more	119 min
Mar 23, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	Ashley, Bradley, Chicot, Desha, Drew, Union	5 hr
Mar 23, 8:49 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, De Soto, Webster	56 min
Mar 23, 10:32 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 13 more	58 min
Mar 23, 2:09 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 19 more	96 min
Mar 23, 3:41 AM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Calhoun, Carroll, Chickasaw, Choctaw and 24 more	64 min
Mar 23, 12:35 PM CDT	Mesoscale Discussion	SPC	Forrest, George, Greene, Hancock, Harrison, Jackson and 6 more	85 min
Mar 23, 12:56 PM CDT	Severe Thunderstorm Watch	SPC	Clarke, Covington, Forrest, George, Greene, Jones and 5 more	9 hr
Mar 23, 2:52 PM CDT	Mesoscale Discussion	SPC	Clarke, George, Greene, Lauderdale, Perry, Wayne	83 min
Mar 23, 5:21 PM CDT	Tornado Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 25 more	6 hr
Mar 23, 5:22 PM CDT	Mesoscale Discussion	SPC	Clarke, George, Greene, Lauderdale, Perry, Wayne	53 min
Mar 23, 6:49 PM CDT	Mesoscale Discussion	SPC	Attala, Carroll, Choctaw, Clay, Holmes, Humphreys and 15 more	116 min

Nearby

Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Arkansas, 2013 Every mesoscale discussion in 2013

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.