Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 569

April 24, 200745 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2007, 6:44 PM CDT for 45 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 2007, 6:44 PM CDT (23:44 UTC)
Expired
Apr 24, 2007, 8:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 45 counties

Bandera County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Comal County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Dimmit County, TX, Edwards County, TX, Falls County, TX, Freestone County, TX, Frio County, TX, Gillespie County, TX, Hamilton County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, La Salle County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, Maverick County, TX, McCulloch County, TX, McLennan County, TX, Medina County, TX, Menard County, TX, Milam County, TX, Mills County, TX, Real County, TX, Robertson County, TX, San Saba County, TX, Sutton County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Williamson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 84 km from the middle of the area, began a volume at 23:45 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, 11.7 hours before the alert went out and 194 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 2007-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2517 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 2007-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 203 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
2517 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
526 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
203 m²/s²
0-3 km storm-relative helicity
223 m²/s²
Significant tornado parameter
2.9
Supercell composite
10.8

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 23, 7:05 PM CDTMesoscale DiscussionSPCArmstrong, Baylor, Borden, Briscoe, Callahan, Carson and 46 more115 min
Apr 23, 7:48 PM CDTTornado WatchSPCEdwards, Kinney, Maverick, Real, Uvalde, Val Verde and 1 more105 min
Apr 23, 9:17 PM CDTMesoscale DiscussionSPCKinney, Uvalde118 min
Apr 23, 10:22 PM CDTMesoscale DiscussionSPCBaylor, Callahan, Coke, Cottle, Crosby, Dickens and 18 more83 min
Apr 24, 7:29 AM CDTMesoscale DiscussionSPCCrockett, Glasscock, Irion, Reagan, Sterling, Upton91 min
Apr 24, 11:23 AM CDTTornado WatchSPCArcher, Baylor, Clay, Wichita9 hr
Apr 24, 11:28 AM CDTMesoscale DiscussionSPCArcher, Baylor, Brown, Callahan, Clay, Coke and 33 more2 hr
Apr 24, 11:49 AM CDTTornado WatchSPCBrown, Callahan, Coke, Coleman, Collin, Comanche and 35 more11 hr
Apr 24, 12:40 PM CDTMesoscale DiscussionSPCBosque, Collin, Coryell, Dallas, Delta, Denton and 23 more2 hr
Apr 24, 2:40 PM CDTTornado WatchSPCBosque, Bowie, Camp, Cass, Delta, Ellis and 21 more8 hr
Apr 24, 3:58 PM CDTTornado Watch PDSSPCAnderson, Bandera, Bell, Bexar, Blanco, Brown and 43 more7 hr
Apr 24, 6:16 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Wichita119 min

Nearby

Mesoscale Discussions in Texas, 2007Every mesoscale discussion in 2007

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.