Alert archive / Louisiana / Mesoscale Discussions in 2020

Mesoscale Discussion 25

January 11, 202013 parishes in Louisiana; Sabine County, Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 1:19 AM CST for 13 parishes in Louisiana; Sabine County, Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Jan 11, 2020, 1:19 AM CST (07:19 UTC)
Expired
Jan 11, 2020, 2:45 AM CST
In force
86 min
Issued by
the Storm Prediction Center

Counties Bienville Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Sabine County, TX

The radar

The Shreveport radar (KSHV), 89 km from the middle of the area, began a volume at 07:23 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 00:00Z, 7.3 hours before the alert went out and 81 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 00:00Z on 2020-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 703 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 00:00Z on 2020-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 379 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
703 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
813 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
379 m²/s²
0-3 km storm-relative helicity
620 m²/s²
Significant tornado parameter
1.6
Supercell composite
6.1

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
Jan 10, 7:30 PM CSTMesoscale DiscussionSPCBossier, Caddo, Webster2 hr
Jan 10, 10:40 PM CSTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 2 more2 hr
Jan 11, 12:21 AM CSTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 11 more99 min
Jan 11, 12:28 AM CSTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 24 more8 hr
Jan 11, 2:22 AM CSTMesoscale DiscussionSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Richland and 2 more53 min
Jan 11, 2:37 AM CSTTornado WatchSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more8 hr
Jan 11, 4:31 AM CSTMesoscale DiscussionSPCAcadia, Ascension, Avoyelles, Caldwell, Catahoula, Concordia and 21 more59 min
Jan 11, 5:18 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more7 hr
Jan 11, 7:39 AM CSTMesoscale DiscussionSPCAscension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 8 more96 min
Jan 10, 6:30 PM CSTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 16 more2 hr
Jan 10, 8:49 PM CSTMesoscale DiscussionSPCAngelina, Austin, Brazoria, Brazos, Burleson, Chambers and 25 more116 min
Jan 10, 9:09 PM CSTTornado WatchSPCAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more5 hr
Jan 11, 7:34 AM CSTMesoscale DiscussionSPCCooke, Denton, Fannin, Grayson116 min

Nearby

Mesoscale Discussions in Louisiana, 2020Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020

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.