Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 640

May 1, 200735 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 1, 2007, 7:08 PM CDT for 35 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
May 1, 2007, 7:08 PM CDT (00:08 UTC)
Expired
May 1, 2007, 8:45 PM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 35 counties

Austin County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, Fayette County, TX, Gillespie County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Lavaca County, TX, Lee County, TX, Llano County, TX, Madison County, TX, Mason County, TX, McCulloch County, TX, Medina County, TX, Real County, TX, San Saba County, TX, Travis County, TX, Uvalde County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 38 km from the middle of the area, began a volume at 00:09 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 nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 0.1 hours before the alert went out and 263 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, Corpus Christi, TX at 00:00Z on 2007-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1982 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, Corpus Christi, TX at 00:00Z on 2007-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
1982 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
878 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.9
Supercell composite
5.5

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 2, 7:19 AM CDTMesoscale DiscussionSPCAndrews, Dawson, Ector, Gaines, Loving, Martin and 4 more2 hr
May 2, 7:40 AM CDTMesoscale DiscussionSPCCrane, Crockett, Ector, Loving, Midland, Pecos and 7 more2 hr
May 2, 8:02 AM CDTSevere Thunderstorm WatchSPCAndrews, Borden, Coke, Crane, Crockett, Dawson and 20 more6 hr
May 2, 10:11 AM CDTMesoscale DiscussionSPCBrewster, Crane, Crockett, Glasscock, Howard, Irion and 7 more94 min
May 2, 12:07 PM CDTMesoscale DiscussionSPCCulberson, Hudspeth, Jeff Davis, Loving, Reeves113 min
May 2, 12:39 PM CDTMesoscale DiscussionSPCBandera, Brown, Callahan, Coke, Coleman, Comanche and 29 more66 min
May 2, 12:50 PM CDTTornado WatchSPCBandera, Brown, Burnet, Callahan, Coke, Coleman and 31 more6 hr
May 2, 1:53 PM CDTSevere Thunderstorm WatchSPCAndrews, Crane, Culberson, Dawson, Ector, Gaines and 14 more7 hr
May 2, 2:38 PM CDTMesoscale DiscussionSPCBosque, Coryell, Dallas, Denton, Ellis, Erath and 16 more2 hr
May 2, 3:08 PM CDTMesoscale DiscussionSPCDimmit, Frio, Kinney, Maverick, Uvalde, Val Verde and 1 more97 min
May 2, 3:43 PM CDTTornado WatchSPCAnderson, Bell, Bosque, Collin, Comanche, Cooke and 33 more6 hr
May 2, 5:08 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burleson and 20 more67 min
May 2, 5:53 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more7 hr
May 2, 6:05 PM CDTMesoscale DiscussionSPCAndrews, Brewster, Cochran, Coke, Crane, Culberson and 22 more85 min
May 2, 6:52 PM CDTTornado WatchSPCBrewster, Crockett, Jeff Davis, Pecos, Presidio, Terrell3 hr
May 2, 6:54 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Brazos, Burnet, Camp and 54 more81 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.