Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 24

January 13, 201311 counties in Arkansas; 22 parishes in Louisiana; 24 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2013, 3:53 AM CST for 11 counties in Arkansas; 22 parishes in Louisiana; 24 counties in Mississippi. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Jan 13, 2013, 3:53 AM CST (09:53 UTC)
Expired
Jan 13, 2013, 5:30 AM CST
In force
97 min
Issued by
the Storm Prediction Center
All 57 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lee County, AR, Lincoln County, AR, Monroe County, AR, Phillips County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne 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, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Coahoma County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Lafayette County, MS, Leflore County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Union County, MS, Warren County, MS, Washington County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 182 km from the middle of the area, began a volume at 09:55 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

Shreveport, LA (KSHV), launched 00:00Z, 9.9 hours before the alert went out and 221 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, Shreveport, LA at 00:00Z on 2013-01-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1010 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2013-01-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 340 square meters per square second.1939587897117Sfc1 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
1010 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
620 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
340 m²/s²
0-3 km storm-relative helicity
398 m²/s²
Significant tornado parameter
1.8
Supercell composite
9.8

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.

IssuedProductOfficeCountiesLasted
Jan 12, 6:18 PM CSTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 48 more117 min
Jan 12, 9:25 PM CSTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleveland and 31 more2 hr
Jan 12, 10:33 PM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Columbia, Drew, Ouachita and 1 more87 min
Jan 12, 11:29 PM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more5 hr
Jan 13, 1:18 AM CSTMesoscale DiscussionSPCAshley, Chicot, Desha, Drew87 min
Jan 13, 2:30 PM CSTMesoscale DiscussionSPCAscension, Assumption, Lafourche, Livingston, Orleans, Saint Charles and 5 more90 min
Jan 13, 2:46 PM CSTMesoscale DiscussionSPCKemper, Lauderdale, Lowndes, Monroe, Neshoba, Newton and 1 more119 min

Nearby

Mesoscale Discussions in Mississippi, 2013Mesoscale Discussions in Louisiana, 2013Mesoscale Discussions in Arkansas, 2013Every 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.