Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 148

February 11, 20136 counties in Alabama; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 11, 2013, 1:55 AM CST for 6 counties in Alabama; 7 counties in Mississippi. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Feb 11, 2013, 1:55 AM CST (07:55 UTC)
Expired: Feb 11, 2013, 3:30 AM CST
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Butler County, AL, Clarke County, AL, Conecuh County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Forrest County, MS, Greene County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Perry County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 89 km from the middle of the area, began a volume at 07:55 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 nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.9 hours before the alert went out and 186 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: 1263 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 514 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 372 m²/s²
0-3 km storm-relative helicity: 446 m²/s²
Significant tornado parameter: 3.4
Supercell composite: 12.2

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
Feb 10, 6:05 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Conecuh, Covington, Crenshaw and 2 more	85 min
Feb 10, 6:23 PM CST	Mesoscale Discussion	SPC	Bullock, Butler, Choctaw, Clarke, Conecuh, Crenshaw and 7 more	97 min
Feb 10, 9:32 PM CST	Mesoscale Discussion	SPC	Butler, Clarke, Coffee, Conecuh, Covington, Dale and 7 more	88 min
Feb 11, 11:58 AM CST	Mesoscale Discussion	SPC	Geneva, Houston	92 min
Feb 11, 1:01 PM CST	Mesoscale Discussion	SPC	Amite, Franklin, Lamar, Lawrence, Lincoln, Marion and 3 more	89 min

Nearby

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