Alert archive / Mississippi / Mesoscale Discussions in 2011

Mesoscale Discussion 1247

June 16, 20116 counties in Alabama; 38 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2011, 3:13 PM CDT for 6 counties in Alabama; 38 counties in Mississippi. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jun 16, 2011, 3:13 PM CDT (20:13 UTC)
Expired: Jun 16, 2011, 4:15 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 44 counties

Choctaw County, AL, Clarke County, AL, Marengo County, AL, Monroe County, AL, Sumter County, AL, Washington County, AL, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Covington County, MS, Greene County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Jasper County, MS, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Perry County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 68 km from the middle of the area, began a volume at 20:12 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 485Jun 16, 3:35 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.2 hours before the alert went out and 75 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: 2865 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 913 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 39 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 16, 12:02 PM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Escambia, Mobile, Monroe and 1 more	58 min
Jun 16, 3:39 PM CDT	Severe Thunderstorm Watch	SPC	Choctaw, Washington	5 hr
Jun 16, 4:41 PM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Coahoma, DeSoto, Marshall, Panola and 6 more	7 hr
Jun 16, 6:18 PM CDT	Mesoscale Discussion	SPC	Attala, Benton, Bolivar, Carroll, Clarke, Coahoma and 19 more	87 min

Nearby

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