Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 441

April 27, 20144 parishes in Louisiana; 42 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2014, 10:45 PM CDT for 4 parishes in Louisiana; 42 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 27, 2014, 10:45 PM CDT (03:45 UTC)
Expired
Apr 28, 2014, 12:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 46 counties

Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Sabine Parish, LA, Anderson County, TX, Angelina County, TX, Brazos County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Falls 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, Hunt County, TX, Kaufman County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 175 km from the middle of the area, began a volume at 03:47 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

Fort Worth, TX (KFWD), launched 00:00Z, 3.8 hours before the alert went out and 189 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, Fort Worth, TX at 00:00Z on 2014-04-28Temperature 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, Fort Worth, TX at 00:00Z on 2014-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
4165 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 27, 8:09 PM CDTMesoscale DiscussionSPCBossier, Caddo, Claiborne, Lincoln, Union, Webster66 min
Apr 27, 11:08 PM CDTTornado WatchSPCBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more6 hr
Apr 28, 2:50 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more115 min
Apr 28, 4:21 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more54 min
Apr 28, 4:40 AM CDTTornado WatchSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 22 more7 hr
Apr 28, 7:16 AM CDTMesoscale DiscussionSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 12 more89 min
Apr 28, 9:53 AM CDTMesoscale DiscussionSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 9 more97 min
Apr 28, 12:05 PM CDTMesoscale DiscussionSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, LaSalle and 5 more115 min
Apr 28, 12:39 PM CDTTornado Watch PDSSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Richland and 2 more8 hr
Apr 28, 3:55 PM CDTMesoscale DiscussionSPCAllen, Beauregard, Evangeline, Jefferson Davis, Rapides, Vernon2 hr
Apr 27, 9:59 PM CDTMesoscale DiscussionSPCBowie91 min

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.