Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 203

February 22, 20136 counties in Alabama; 10 parishes in Louisiana; 24 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 22, 2013, 1:28 PM CST for 6 counties in Alabama; 10 parishes in Louisiana; 24 counties in Mississippi. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Feb 22, 2013, 1:28 PM CST (19:28 UTC)
Expired: Feb 22, 2013, 2:30 PM CST
In force: 62 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 40 counties

Choctaw County, AL, Clarke County, AL, Marengo County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Feliciana Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Washington Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Greene County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 90 km from the middle of the area, began a volume at 19:31 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

Jackson, MS (KJAN), launched 12:00Z, 7.5 hours before the alert went out and 96 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1491 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: -154 m²/s²
0-3 km storm-relative helicity: 150 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
Feb 21, 11:57 PM CST	Mesoscale Discussion	SPC	Choctaw, Washington	63 min
Feb 21, 6:45 PM CST	Mesoscale Discussion	SPC	Acadia, East Feliciana, Lafayette, Pointe Coupee, Saint Landry, West Feliciana	30 min
Feb 21, 8:53 PM CST	Mesoscale Discussion	SPC	Amite, Copiah, Covington, Forrest, Franklin, Jefferson Davis and 10 more	67 min
Feb 21, 10:53 PM CST	Mesoscale Discussion	SPC	Amite, Covington, Forrest, Jefferson Davis, Jones, Lamar and 6 more	67 min

Nearby

Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Louisiana, 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.