Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 582

April 20, 200685 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2006, 1:21 PM CDT for 85 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 20, 2006, 1:21 PM CDT (18:21 UTC)
Expired
Apr 20, 2006, 2:45 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 85 counties

Anderson County, TX, Bell County, TX, Blanco County, TX, Borden County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Crane County, TX, Crockett County, TX, Dallas County, TX, Dawson County, TX, Denton County, TX, Eastland County, TX, Ector County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fisher County, TX, Freestone County, TX, Gillespie County, TX, Glasscock County, TX, Hamilton County, TX, Haskell County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Howard County, TX, Irion County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Kaufman County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Madison County, TX, Martin County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Midland County, TX, Milam County, TX, Mills County, TX, Mitchell County, TX, Navarro County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Pecos County, TX, Reagan County, TX, Robertson County, TX, Rockwall County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Scurry County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Sutton County, TX, Tarrant County, TX, Taylor County, TX, Terrell County, TX, Throckmorton County, TX, Tom Green County, TX, Travis County, TX, Upton County, TX, Van Zandt County, TX, Williamson County, TX, Wise County, TX, Young County, TX

The radar

The San Angelo radar (KSJT), 46 km from the middle of the area, began a volume at 18:25 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

Del Rio, TX (KDRT), launched 12:00Z, 6.4 hours before the alert went out and 247 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, Del Rio, TX at 12:00Z on 2006-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1378 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, Del Rio, TX at 12:00Z on 2006-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
1378 J/kg
Mixed-layer CIN
-155 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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 19, 7:31 PM CDTMesoscale DiscussionSPCDimmit, Frio, La Salle, Webb, Zavala119 min
Apr 19, 7:41 PM CDTMesoscale DiscussionSPCAngelina, Camp, Cass, Cherokee, Gregg, Harrison and 11 more94 min
Apr 19, 8:30 PM CDTMesoscale DiscussionSPCBorden, Bosque, Brown, Callahan, Coke, Coleman and 37 more60 min
Apr 19, 8:55 PM CDTSevere Thunderstorm WatchSPCArcher, Bosque, Brown, Callahan, Clay, Coke and 33 more6 hr
Apr 19, 9:23 PM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bowie, Camp, Cass, Cherokee and 35 more5 hr
Apr 20, 1:49 AM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bowie, Camp, Cass, Cherokee and 35 more7 hr
Apr 20, 2:43 AM CDTMesoscale DiscussionSPCBorden, Callahan, Dawson, Eastland, Fisher, Glasscock and 11 more62 min
Apr 20, 2:53 AM CDTSevere Thunderstorm WatchSPCDimmit, Edwards, Kinney, Maverick, Real, Uvalde and 2 more3 hr
Apr 20, 3:13 AM CDTSevere Thunderstorm WatchSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 26 more8 hr
Apr 20, 4:55 AM CDTMesoscale DiscussionSPCDimmit, Edwards, Kinney, Maverick, Real, Uvalde and 1 more65 min
Apr 20, 9:30 AM CDTSevere Thunderstorm WatchSPCBandera, Brown, Coke, Coleman, Concho, Crockett and 24 more7 hr
Apr 20, 10:15 AM CDTMesoscale DiscussionSPCBorden, Callahan, Coke, Coleman, Concho, Crane and 26 more60 min
Apr 20, 11:18 AM CDTSevere Thunderstorm WatchSPCBastrop, Bexar, Blanco, Burnet, Caldwell, Comal and 9 more4 hr
Apr 20, 2:58 PM CDTMesoscale DiscussionSPCBandera, Blanco, Burnet, Comal, Crockett, Edwards and 16 more62 min
Apr 20, 3:24 PM CDTTornado WatchSPCBandera, Bastrop, Bexar, Blanco, Brazos, Burleson and 34 more7 hr
Apr 20, 3:31 PM CDTSevere Thunderstorm WatchSPCBell, Bosque, Brown, Callahan, Coke, Coleman and 20 more6 hr
Apr 20, 3:54 PM CDTMesoscale DiscussionSPCLoving, Ward, Winkler66 min
Apr 20, 4:37 PM CDTTornado WatchSPCAndrews, Crane, Dawson, Ector, Gaines, Glasscock and 10 more4 hr
Apr 20, 5:54 PM CDTMesoscale DiscussionSPCAustin, Bastrop, Brazos, Burleson, Caldwell, Colorado and 11 more96 min
Apr 20, 6:34 PM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Cherokee, Ellis, Gregg, Grimes and 29 more6 hr

Nearby

Mesoscale Discussions in Texas, 2006Every mesoscale discussion in 2006

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.