Alert archive / Mississippi / Mesoscale Discussions in 2011

Mesoscale Discussion 1207

June 13, 2011Chicot County, Desha County, Arkansas; 8 parishes in Louisiana; 55 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2011, 1:32 PM CDT for Chicot County, Desha County, Arkansas; 8 parishes in Louisiana; 55 counties in Mississippi. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jun 13, 2011, 1:32 PM CDT (18:32 UTC)
Expired: Jun 13, 2011, 2:30 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 65 counties

Chicot County, AR, Desha County, AR, East Carroll Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Helena Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Amite County, MS, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Grenada County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jackson County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Oktibbeha County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Sunflower County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 97 km from the middle of the area, began a volume at 18:38 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.

Severe Thunderstorm Watch 473Jun 13, 2:45 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 6.5 hours before the alert went out and 102 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: 1497 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1118 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jun 13, 9:06 AM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Craighead, Crittenden, Cross, Fulton and 10 more	54 min
Jun 13, 10:05 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Baxter, Clay, Cleburne, Craighead, Crittenden and 25 more	8 hr
Jun 13, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	Chicot	6 hr
Jun 13, 3:25 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Boone, Cleburne, Conway, Cross and 22 more	35 min
Jun 13, 5:59 PM CDT	Mesoscale Discussion	SPC	Chicot	61 min

Nearby

Mesoscale Discussions in Mississippi, 2011 Mesoscale Discussions in Louisiana, 2011 Mesoscale Discussions in Arkansas, 2011 Every mesoscale discussion in 2011

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.