Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 141

February 10, 201311 parishes in Louisiana; 19 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2013, 1:59 PM CST for 11 parishes in Louisiana; 19 counties in Mississippi. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Feb 10, 2013, 1:59 PM CST (19:59 UTC)
Expired: Feb 10, 2013, 3:30 PM CST
In force: 91 min
Issued by: the Storm Prediction Center

All 30 counties

East Baton Rouge Parish, LA, East Feliciana Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Rankin County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wilkinson County, MS

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, 8.0 hours before the alert went out and 128 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: 504 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 482 m²/s²
0-3 km storm-relative helicity: 561 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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, 4:18 AM CST	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more	5 hr
Feb 10, 5:12 AM CST	Mesoscale Discussion	SPC	Sabine	93 min
Feb 10, 6:20 AM CST	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 18 more	85 min
Feb 10, 6:58 AM CST	Tornado Watch	SPC	Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 24 more	7 hr
Feb 10, 10:19 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Caldwell, Catahoula and 19 more	86 min
Feb 10, 10:53 AM CST	Mesoscale Discussion	SPC	Avoyelles, Concordia, Evangeline, Pointe Coupee, Saint Landry, West Feliciana	97 min
Feb 10, 11:10 AM CST	Tornado Watch	SPC	Avoyelles, Catahoula, Concordia, East Baton Rouge, East Feliciana, Evangeline and 12 more	7 hr
Feb 10, 3:47 PM CST	Mesoscale Discussion	SPC	Saint Helena, Washington	88 min
Feb 10, 5:03 PM CST	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Evangeline, Livingston, Pointe Coupee, Saint Helena and 6 more	27 min
Feb 10, 5:34 PM CST	Tornado Watch	SPC	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more	5 hr
Feb 10, 2:39 PM CST	Mesoscale Discussion	SPC	George, Greene, Wayne	66 min
Feb 10, 3:14 PM CST	Tornado Watch	SPC	George, Greene, Harrison, Jackson, Perry, Stone and 1 more	8 hr

Nearby

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