Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 287

April 4, 201414 parishes in Louisiana; 23 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2014, 5:49 AM CDT for 14 parishes in Louisiana; 23 counties in Texas. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2014, 5:49 AM CDT (10:49 UTC)
Expired
Apr 4, 2014, 6:45 AM CDT
In force
56 min
Issued by
the Storm Prediction Center
All 37 counties

Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, De Soto Parish, LA, Franklin Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Angelina County, TX, Austin County, TX, Chambers County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX

The radar

The Ft Polk radar (KPOE), 114 km from the middle of the area, began a volume at 10:52 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 (KBAD), launched 00:00Z, 10.8 hours before the alert went out and 144 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 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2253 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 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 square meters per square second.19395878Sfc1 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
2253 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
988 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
155 m²/s²
Significant tornado parameter
1.9
Supercell composite
6.9

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
Apr 3, 8:44 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more31 min
Apr 3, 8:54 PM CDTTornado WatchSPCBienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more7 hr
Apr 4, 12:20 AM CDTMesoscale DiscussionSPCCaldwell, Catahoula, East Carroll, Franklin, LaSalle, Madison and 5 more55 min
Apr 4, 12:40 AM CDTTornado WatchSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more5 hr
Apr 4, 12:55 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 4 more95 min
Apr 4, 3:34 AM CDTSevere Thunderstorm WatchSPCAllen, Beauregard, Calcasieu, Caldwell, Cameron, De Soto and 9 more6 hr
Apr 4, 3:45 AM CDTMesoscale DiscussionSPCCaldwell, East Carroll, Franklin, Jackson, Madison, Morehouse and 4 more60 min
Apr 4, 5:04 AM CDTMesoscale DiscussionSPCAcadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 15 more116 min
Apr 4, 5:25 AM CDTSevere Thunderstorm WatchSPCAcadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 30 more7 hr
Apr 4, 5:28 AM CDTMesoscale DiscussionSPCCatahoula, Concordia, Madison, Tensas92 min
Apr 4, 7:22 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 26 more83 min
Apr 4, 10:12 AM CDTMesoscale DiscussionSPCAcadia, Ascension, Assumption, Avoyelles, Cameron, Catahoula and 28 more63 min
Apr 3, 7:03 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Bowie, Camp, Cass and 49 more57 min
Apr 3, 7:18 PM CDTMesoscale DiscussionSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 11 more57 min
Apr 3, 7:35 PM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Blanco, Burnet, Caldwell, Comal and 9 more2 hr
Apr 3, 11:52 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bee, Dimmit, Duval, Frio, Goliad and 12 more8 hr
Apr 4, 2:40 AM CDTMesoscale DiscussionSPCAngelina, Austin, Brazoria, Brazos, Burleson, Chambers and 26 more2 hr
Apr 4, 2:58 AM CDTMesoscale DiscussionSPCAtascosa, Bee, Dimmit, Frio, Karnes, La Salle and 3 more92 min
Apr 4, 6:12 AM CDTMesoscale DiscussionSPCBee, Brooks, Cameron, Duval, Hidalgo, Jim Hogg and 12 more3 hr

Nearby

Mesoscale Discussions in Texas, 2014Mesoscale Discussions in Louisiana, 2014Every mesoscale discussion in 2014

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.