Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 689

April 29, 200630 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2006, 1:51 AM CDT for 30 counties in Texas. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2006, 1:51 AM CDT (06:51 UTC)
Expired
Apr 29, 2006, 2:15 AM CDT
In force
24 min
Issued by
the Storm Prediction Center
All 30 counties

Atascosa County, TX, Austin County, TX, Bastrop County, TX, Bell County, TX, Bexar County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Fayette County, TX, Frio County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Jackson County, TX, Karnes County, TX, Lavaca County, TX, Lee County, TX, Madison County, TX, Milam County, TX, Robertson County, TX, Travis County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Williamson County, TX, Wilson County, TX

The radar

The Ft Hood radar (KGRK), 68 km from the middle of the area, began a volume at 06:51 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 00:00Z, 6.9 hours before the alert went out and 266 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 2006-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1970 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 2006-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 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
1970 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.6

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 28, 7:43 PM CDTTornado WatchSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 33 more6 hr
Apr 28, 8:44 PM CDTMesoscale DiscussionSPCClay, Collin, Cooke, Denton, Fannin, Grayson and 8 more91 min
Apr 28, 10:03 PM CDTMesoscale DiscussionSPCAnderson, Bastrop, Brazos, Burleson, Camp, Cass and 32 more87 min
Apr 28, 11:08 PM CDTTornado WatchSPCAnderson, Angelina, Austin, Bowie, Brazos, Burleson and 40 more7 hr
Apr 28, 11:14 PM CDTMesoscale DiscussionSPCBandera, Bexar, Edwards, Frio, Kendall, Kerr and 5 more91 min
Apr 29, 1:58 AM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 18 more3 hr
Apr 29, 4:03 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Atascosa, Austin, Bastrop, Bell and 61 more57 min
Apr 29, 6:04 AM CDTTornado WatchSPCAngelina, Bowie, Brazoria, Camp, Cass, Chambers and 33 more7 hr
Apr 29, 7:37 AM CDTMesoscale DiscussionSPCAngelina, Bowie, Brazoria, Cass, Chambers, Galveston and 21 more83 min
Apr 29, 9:57 AM CDTMesoscale DiscussionSPCChambers, Hardin, Jefferson, Newton, Orange2 hr
Apr 29, 10:05 AM CDTMesoscale DiscussionSPCCollin, Cooke, Delta, Fannin, Grayson, Hunt and 2 more115 min
Apr 29, 11:55 AM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Franklin, Gregg, Harrison and 15 more65 min
Apr 29, 12:47 PM CDTTornado WatchSPCBowie, Camp, Cass, Franklin, Gregg, Harrison and 15 more8 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.