Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 344

April 13, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2014, 7:54 PM CDT for 4 states. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2014, 7:54 PM CDT (00:54 UTC)
Expired
Apr 13, 2014, 9:00 PM CDT
In force
66 min
Issued by
the Storm Prediction Center
All 90 counties

Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle 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, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Bosque County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Hamilton County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Limestone County, TX, Marion County, TX, McLennan County, TX, Montague County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Palo Pinto County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX, Young County, TX

The radar

The Shreveport radar (KSHV), 159 km from the middle of the area, began a volume at 00:54 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 0.9 hours before the alert went out and 167 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 2014-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 244 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 2014-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 544 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
244 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
826 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
544 m²/s²
0-3 km storm-relative helicity
713 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.2

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
Apr 13, 7:14 PM CDTSevere Thunderstorm WatchSPCClark, Cleburne, Conway, Crawford, Faulkner, Franklin and 16 more6 hr
Apr 13, 9:12 PM CDTMesoscale DiscussionSPCClay, Craighead, Cross, Fulton, Greene, Independence and 8 more63 min
Apr 13, 10:33 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 49 more57 min
Apr 13, 11:06 PM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Cleveland, Columbia, Crittenden and 28 more6 hr
Apr 14, 1:22 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 6 more53 min
Apr 14, 1:50 AM CDTTornado WatchSPCAshley, Chicot5 hr
Apr 14, 2:05 AM CDTMesoscale DiscussionSPCBradley, Calhoun, Columbia, Desha, Drew, Hempstead and 5 more85 min
Apr 14, 4:34 AM CDTMesoscale DiscussionSPCFranklin, Madison, Richland, Tensas56 min
Apr 14, 7:42 AM CDTMesoscale DiscussionSPCBeauregard, Natchitoches, Red River, Sabine, Vernon, Winn2 hr
Apr 14, 10:34 AM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more6 hr
Apr 14, 12:30 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 25 more2 hr
Apr 14, 1:11 PM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 41 more10 hr
Apr 14, 3:36 PM CDTMesoscale DiscussionSPCAscension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 9 more2 hr

Nearby

Mesoscale Discussions in Texas, 2014Mesoscale Discussions in Louisiana, 2014Mesoscale Discussions in Arkansas, 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.