Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 1255

July 2, 2014Arkansas County, Chicot County, Desha County, Arkansas; 30 parishes in Louisiana; 49 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jul 2, 2014, 1:41 PM CDT for Arkansas County, Chicot County, Desha County, Arkansas; 30 parishes in Louisiana; 49 counties in Mississippi. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 2, 2014, 1:41 PM CDT (18:41 UTC)
Expired: Jul 2, 2014, 3:15 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 82 counties

Arkansas County, AR, Chicot County, AR, Desha County, AR, Allen Parish, LA, Avoyelles Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline 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, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Coahoma County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis 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, Panola County, MS, Pike County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 134 km from the middle of the area, began a volume at 18:45 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 387Jul 2, 2:15 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 6.7 hours before the alert went out and 124 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: 2402 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 984 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -78 m²/s²
0-3 km storm-relative helicity: -14 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
Jul 1, 7:29 PM CDT	Mesoscale Discussion	SPC	Greene, Lawrence	61 min
Jul 1, 8:32 PM CDT	Mesoscale Discussion	SPC	Crittenden, Cross	2 hr
Jul 2, 2:17 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 20 more	7 hr
Jul 2, 5:36 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Caldwell, Catahoula, Concordia, Evangeline and 7 more	54 min

Nearby

Mesoscale Discussions in Mississippi, 2014 Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Arkansas, 2014 Every mesoscale discussion in 2014

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.