Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 144

February 10, 2013Choctaw County, Washington County, Alabama; 12 parishes in Louisiana; 16 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2013, 5:03 PM CST for Choctaw County, Washington County, Alabama; 12 parishes in Louisiana; 16 counties in Mississippi. It was in force for 27 min.

The area

The outline as issued.

The facts

Issued
Feb 10, 2013, 5:03 PM CST (23:03 UTC)
Expired
Feb 10, 2013, 5:30 PM CST
In force
27 min
Issued by
the Storm Prediction Center
All 30 counties

Choctaw County, AL, Washington County, AL, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline 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, Covington County, MS, Forrest County, MS, Greene County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.1 hours before the alert went out and 100 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2013-02-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 66 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2013-02-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 526 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
66 J/kg
Mixed-layer CIN
-189 J/kg
Mixed-layer LCL
522 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
526 m²/s²
0-3 km storm-relative helicity
760 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.2

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.

IssuedProductOfficeCountiesLasted
Feb 10, 2:39 PM CSTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Conecuh, Dallas, Escambia and 6 more66 min
Feb 10, 3:14 PM CSTTornado WatchSPCBaldwin, Barbour, Bullock, Butler, Choctaw, Clarke and 11 more8 hr
Feb 10, 4:18 AM CSTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more5 hr
Feb 10, 5:12 AM CSTMesoscale DiscussionSPCSabine93 min
Feb 10, 6:20 AM CSTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 18 more85 min
Feb 10, 6:58 AM CSTTornado WatchSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 24 more7 hr
Feb 10, 10:19 AM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Caldwell, Catahoula and 19 more86 min
Feb 10, 10:53 AM CSTMesoscale DiscussionSPCAvoyelles, Concordia, Evangeline, Pointe Coupee, Saint Landry, West Feliciana97 min
Feb 10, 11:10 AM CSTTornado WatchSPCAvoyelles, Catahoula, Concordia, East Baton Rouge, East Feliciana, Evangeline and 12 more7 hr
Feb 10, 1:59 PM CSTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 5 more91 min
Feb 10, 3:47 PM CSTMesoscale DiscussionSPCSaint Helena, Washington88 min
Feb 10, 5:34 PM CSTTornado WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more5 hr

Nearby

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