Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 626

April 30, 200721 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2007, 12:37 PM CDT for 21 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2007, 12:37 PM CDT (17:37 UTC)
Expired
Apr 30, 2007, 2:00 PM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 21 counties

Atascosa County, TX, Bastrop County, TX, Bee County, TX, Caldwell County, TX, DeWitt County, TX, Dimmit County, TX, Fayette County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Karnes County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Live Oak County, TX, Maverick County, TX, McMullen County, TX, Travis County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 85 km from the middle of the area, began a volume at 17:40 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

Corpus Christi, TX (KCRP), launched 12:00Z, 5.6 hours before the alert went out and 183 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 12:00Z on 2007-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2122 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 12:00Z on 2007-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.193958Sfc1 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
2122 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
471 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.1

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 29, 7:25 PM CDTMesoscale DiscussionSPCBrewster, Crane, Crockett, Culberson, Jeff Davis, Loving and 11 more65 min
Apr 29, 7:48 PM CDTTornado WatchSPCBandera, Brewster, Crane, Crockett, Dimmit, Edwards and 18 more7 hr
Apr 29, 8:35 PM CDTMesoscale DiscussionSPCBaylor, Callahan, Coke, Coleman, Concho, Ector and 24 more115 min
Apr 29, 10:42 PM CDTMesoscale DiscussionSPCBandera, Brewster, Crane, Crockett, Dimmit, Edwards and 18 more63 min
Apr 30, 2:10 AM CDTMesoscale DiscussionSPCBandera, Crockett, Dimmit, Edwards, Frio, Kerr and 12 more95 min
Apr 30, 2:47 AM CDTMesoscale DiscussionSPCBandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 10 more3 hr
Apr 30, 2:51 AM CDTSevere Thunderstorm WatchSPCBandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 9 more5 hr
Apr 30, 4:46 AM CDTMesoscale DiscussionSPCBandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 9 more119 min
Apr 30, 1:22 PM CDTMesoscale DiscussionSPCCamp, Collin, Dallas, Delta, Fannin, Franklin and 14 more113 min
Apr 30, 1:26 PM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Colorado, DeWitt, Fayette, Fort Bend and 10 more7 hr
Apr 30, 3:01 PM CDTTornado WatchSPCDimmit, Duval, Frio, Jim Wells, La Salle, Live Oak and 4 more7 hr
Apr 30, 3:23 PM CDTMesoscale DiscussionSPCGrimes, Harris, Houston, Leon, Liberty, Madison and 4 more97 min
Apr 30, 5:38 PM CDTMesoscale DiscussionSPCArcher, Armstrong, Baylor, Borden, Briscoe, Callahan and 42 more2 hr
Apr 30, 6:18 PM CDTMesoscale DiscussionSPCDimmit, Duval, Frio, Jim Wells, La Salle, Live Oak and 4 more57 min
Apr 30, 6:37 PM CDTMesoscale DiscussionSPCAustin, Brazoria, Colorado, DeWitt, Fayette, Fort Bend and 10 more83 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.