Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 78

January 29, 2013Caddo Parish, Louisiana; 31 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 29, 2013, 5:51 PM CST for Caddo Parish, Louisiana; 31 counties in Texas. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Jan 29, 2013, 5:51 PM CST (23:51 UTC)
Expired
Jan 29, 2013, 7:45 PM CST
In force
114 min
Issued by
the Storm Prediction Center
All 32 counties

Caddo Parish, LA, Anderson County, TX, Angelina County, TX, Brazos County, TX, Burleson County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Lee County, TX, Leon County, TX, Madison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Robertson County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Wood County, TX

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.9 hours before the alert went out and 172 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, Shreveport, LA at 12:00Z on 2013-01-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 250 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, Shreveport, LA at 12:00Z on 2013-01-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 266 square meters per square second.1939587897Sfc1 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
250 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
471 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
266 m²/s²
0-3 km storm-relative helicity
336 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.4

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
Jan 29, 4:37 PM CSTMesoscale DiscussionSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Jackson and 9 more2 hr
Jan 29, 4:58 PM CSTMesoscale DiscussionSPCBossier, Caddo, Claiborne, Webster92 min
Jan 29, 5:37 PM CSTTornado WatchSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more8 hr
Jan 29, 3:28 AM CSTMesoscale DiscussionSPCBaylor, Foard, Hardeman, Knox, Wichita, Wilbarger92 min
Jan 29, 4:57 AM CSTTornado WatchSPCHardeman, Wilbarger7 hr
Jan 29, 9:46 AM CSTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Cooke, Delta and 10 more119 min
Jan 29, 10:37 AM CSTMesoscale DiscussionSPCBosque, Brown, Coleman, Collin, Comanche, Concho and 30 more53 min
Jan 29, 10:59 AM CSTTornado WatchSPCBowie, Camp, Cass, Collin, Delta, Fannin and 18 more8 hr
Jan 29, 11:28 AM CSTSevere Thunderstorm WatchSPCBosque, Brown, Callahan, Coleman, Comanche, Concho and 30 more6 hr
Jan 29, 2:15 PM CSTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Dallas, Delta and 18 more2 hr
Jan 29, 3:46 PM CSTMesoscale DiscussionSPCCoryell, Dallas, Ellis, Hill, McLennan119 min

Nearby

Mesoscale Discussions in Texas, 2013Mesoscale Discussions in Louisiana, 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.