Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 888

May 23, 2011Lafayette County, Little River County, Miller County, Arkansas; Bossier Parish, Caddo Parish, Louisiana; 36 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 9:57 AM CDT for Lafayette County, Little River County, Miller County, Arkansas; Bossier Parish, Caddo Parish, Louisiana; 36 counties in Texas. It was in force for 33 min.

The area

The outline as issued.

The facts

Issued
May 23, 2011, 9:57 AM CDT (14:57 UTC)
Expired
May 23, 2011, 10:30 AM CDT
In force
33 min
Issued by
the Storm Prediction Center
All 41 counties

Lafayette County, AR, Little River County, AR, Miller County, AR, Bossier Parish, LA, Caddo Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 142 km from the middle of the area, began a volume at 14:58 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 12:00Z, 3.0 hours before the alert went out and 137 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 12:00Z on 2011-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2692 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, Fort Worth, TX at 12:00Z on 2011-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 387 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
2692 J/kg
Mixed-layer CIN
-168 J/kg
Mixed-layer LCL
610 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
387 m²/s²
0-3 km storm-relative helicity
362 m²/s²
Significant tornado parameter
0.6
Supercell composite
15.4

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
May 22, 7:52 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Conway, Crawford and 13 more53 min
May 22, 8:47 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Clay, Cleburne and 34 more7 hr
May 22, 11:46 PM CDTMesoscale DiscussionSPCClay, Cleburne, Conway, Craighead, Crawford, Cross and 23 more89 min
May 23, 5:07 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Fulton and 10 more113 min
May 23, 7:38 AM CDTMesoscale DiscussionSPCBenton, Carroll97 min
May 23, 9:14 AM CDTMesoscale DiscussionSPCClark, Cleburne, Conway, Crawford, Dallas, Faulkner and 26 more91 min
May 23, 10:34 AM CDTMesoscale DiscussionSPCBenton, Carroll, Fulton86 min
May 23, 12:10 PM CDTMesoscale DiscussionSPCLafayette, Miller65 min
May 23, 12:12 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clay, Craighead and 13 more93 min
May 23, 1:16 PM CDTMesoscale DiscussionSPCBaxter, Clay, Craighead, Fulton, Greene, Independence and 5 more89 min
May 23, 1:34 PM CDTSevere Thunderstorm WatchSPCClay, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more6 hr
May 23, 3:58 PM CDTMesoscale DiscussionSPCClay, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more92 min
May 23, 5:07 PM CDTMesoscale DiscussionSPCBenton, Crawford, Washington23 min
May 23, 5:24 PM CDTTornado WatchSPCCrawford, Franklin, Sebastian, Washington4 hr
May 23, 6:18 PM CDTMesoscale DiscussionSPCCleburne, Craighead, Crittenden, Cross, Faulkner, Independence and 11 more87 min
May 22, 8:10 PM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Clay, Collin, Comanche and 34 more65 min
May 22, 8:59 PM CDTSevere Thunderstorm WatchSPCBell, Bosque, Collin, Comanche, Coryell, Dallas and 28 more2 hr
May 23, 9:59 AM CDTSevere Thunderstorm WatchSPCBosque, Collin, Comanche, Cooke, Dallas, Delta and 29 more6 hr
May 23, 2:08 PM CDTMesoscale DiscussionSPCArcher, Baylor, Childress, Cottle, Foard, Hardeman and 11 more97 min
May 23, 2:30 PM CDTTornado WatchSPCArcher, Baylor, Clay, Foard, Hardeman, Knox and 2 more8 hr
May 23, 4:58 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Eastland, Shackelford, Stephens and 2 more62 min
May 23, 6:51 PM CDTMesoscale DiscussionSPCArcher, Clay, Wichita84 min

Nearby

Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Louisiana, 2011Every mesoscale discussion in 2011

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.