Alert archive / Mississippi / Mesoscale Discussions in 2011

Mesoscale Discussion 1429

June 28, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2011, 9:52 AM CDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jun 28, 2011, 9:52 AM CDT (14:52 UTC)
Expired: Jun 28, 2011, 11:45 AM CDT
In force: 113 min
Issued by: the Storm Prediction Center

All 69 counties

Bibb County, AL, Choctaw County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Lamar County, AL, Marengo County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Dallas County, AR, Drew County, AR, Union County, AR, Caldwell Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Adams County, MS, Attala County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay 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, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Washington County, MS, Wayne County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 65 km from the middle of the area, began a volume at 14:53 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, 2.9 hours before the alert went out and 61 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: 2052 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 823 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 28, 4:17 AM CDT	Severe Thunderstorm Watch	SPC	Colbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 1 more	8 hr
Jun 28, 6:08 AM CDT	Mesoscale Discussion	SPC	Colbert, DeKalb, Franklin, Jackson, Lauderdale, Lawrence and 4 more	97 min
Jun 28, 10:26 AM CDT	Severe Thunderstorm Watch	SPC	Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 26 more	8 hr
Jun 28, 12:53 PM CDT	Mesoscale Discussion	SPC	Barbour, Dale, Henry, Houston, Russell	97 min
Jun 28, 3:19 PM CDT	Mesoscale Discussion	SPC	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 6 more	116 min
Jun 27, 7:05 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Fulton and 9 more	115 min
Jun 28, 4:08 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 25 more	82 min
Jun 28, 6:34 AM CDT	Mesoscale Discussion	SPC	Arkansas, Clay, Cleburne, Conway, Craighead, Crittenden and 28 more	86 min
Jun 28, 7:06 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 22 more	5 hr
Jun 28, 11:42 AM CDT	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Columbia, Dallas, Garland and 13 more	93 min
Jun 28, 11:51 AM CDT	Severe Thunderstorm Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Conway and 28 more	7 hr
Jun 28, 3:09 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 27 more	96 min
Jun 28, 6:09 PM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	96 min

Nearby

Mesoscale Discussions in Mississippi, 2011 Mesoscale Discussions in Alabama, 2011 Mesoscale Discussions in Louisiana, 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.