Alert archive / Texas / Mesoscale Discussions in 2022

Mesoscale Discussion 2018

December 13, 202213 parishes in Louisiana; 15 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 13, 2022, 3:51 PM CST for 13 parishes in Louisiana; 15 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Dec 13, 2022, 3:51 PM CST (21:51 UTC)
Expired
Dec 13, 2022, 5:15 PM CST
In force
84 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 582...583
All 28 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Harrison County, TX, Houston County, TX, Jasper County, TX, Madison County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX

The radar

The Shreveport radar (KSHV), 62 km from the middle of the area, began a volume at 21:50 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

Shreveport, LA (KSHV), launched 12:00Z, 9.9 hours before the alert went out and 67 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 2022-12-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2022-12-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 296 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
0 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
296 m²/s²
0-3 km storm-relative helicity
373 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 13, 1:33 PM CSTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 4 more117 min
Dec 13, 2:12 PM CSTMesoscale DiscussionSPCBossier, Caddo, De Soto, Red River, Sabine63 min
Dec 13, 2:15 PM CSTTornado WatchSPCAvoyelles, Beauregard, Bienville, Bossier, Caddo, Caldwell and 15 more8 hr
Dec 13, 4:44 PM CSTMesoscale DiscussionSPCBienville, De Soto, Natchitoches, Red River, Sabine91 min
Dec 13, 5:04 PM CSTMesoscale DiscussionSPCClaiborne, East Carroll, Lincoln, Morehouse, Ouachita, Union and 1 more116 min
Dec 12, 7:12 PM CSTMesoscale DiscussionSPCHansford, Hutchinson, Ochiltree, Roberts3 hr
Dec 12, 8:25 PM CSTTornado WatchSPCArmstrong, Carson, Collingsworth, Donley, Gray, Hansford and 6 more4 hr
Dec 12, 9:10 PM CSTMesoscale DiscussionSPCBriscoe, Childress, Collingsworth, Cottle, Crosby, Dickens and 8 more3 hr
Dec 12, 9:54 PM CSTTornado WatchSPCArcher, Baylor, Clay, Foard, Hardeman, Knox and 2 more6 hr
Dec 12, 11:24 PM CSTMesoscale DiscussionSPCChildress, Collingsworth, Hall, Hardeman, Wheeler2 hr
Dec 13, 3:07 AM CSTMesoscale DiscussionSPCClay, Cooke, Grayson, Montague113 min
Dec 13, 3:58 AM CSTTornado WatchSPCArcher, Brown, Clay, Collin, Comanche, Cooke and 21 more7 hr
Dec 13, 6:00 AM CSTMesoscale DiscussionSPCCooke, Dallas, Denton, Erath, Hood, Jack and 6 more90 min
Dec 13, 8:59 AM CSTMesoscale DiscussionSPCAnderson, Bosque, Bowie, Camp, Cass, Cherokee and 29 more2 hr
Dec 13, 9:07 AM CSTTornado WatchSPCAnderson, Bosque, Bowie, Camp, Cass, Cherokee and 31 more8 hr
Dec 13, 11:41 AM CSTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Cherokee, Delta and 25 more2 hr

Nearby

Mesoscale Discussions in Texas, 2022Mesoscale Discussions in Louisiana, 2022Every mesoscale discussion in 2022

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.