Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 1283

June 28, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2013, 9:42 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 28, 2013, 9:42 AM CDT (14:42 UTC)
Expired: Jun 28, 2013, 11:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 72 counties

Bibb County, AL, Blount County, AL, Chilton County, AL, Choctaw County, AL, Cullman County, AL, Dallas County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Marengo County, AL, Marion County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Chicot County, AR, Desha County, AR, Lee County, AR, Phillips County, AR, East Carroll Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola 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, Tunica County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Columbus AFB radar (KGWX), 57 km from the middle of the area, began a volume at 14:46 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 385Jun 28, 11:30 AM CDT

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 2.7 hours before the alert went out and 161 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: 4171 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.3

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, 6:16 AM CDT	Mesoscale Discussion	SPC	Colbert, Cullman, Fayette, Franklin, Greene, Lamar and 9 more	89 min
Jun 28, 11:26 AM CDT	Severe Thunderstorm Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 36 more	9 hr
Jun 28, 1:11 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Chambers and 31 more	94 min
Jun 28, 3:23 PM CDT	Mesoscale Discussion	SPC	Baldwin, Barbour, Choctaw, Clarke, Coffee, Conecuh and 9 more	97 min
Jun 28, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Chilton, Dallas, Greene, Hale, Lowndes and 4 more	7 hr
Jun 28, 1:31 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Cleburne, Conway, Craighead, Crittenden and 30 more	59 min
Jun 28, 2:13 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 20 more	5 hr
Jun 28, 4:17 AM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Crittenden and 22 more	58 min
Jun 28, 5:18 AM CDT	Severe Thunderstorm Watch	SPC	Crittenden, Lee, Phillips, St. Francis	8 hr
Jun 28, 12:34 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more	2 hr
Jun 28, 4:41 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Drew, Union	94 min

Nearby

Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Alabama, 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.