Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 1209

June 20, 200771 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2007, 3:44 AM CDT for 71 counties in Texas. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Jun 20, 2007, 3:44 AM CDT (08:44 UTC)
Expired
Jun 20, 2007, 5:15 AM CDT
In force
91 min
Issued by
the Storm Prediction Center
All 71 counties

Anderson County, TX, Bandera County, TX, Bastrop County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Bosque County, TX, Brazos County, TX, Brown County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Cherokee County, TX, Comal County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Crockett County, TX, Dallas County, TX, Edwards County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fayette County, TX, Freestone County, TX, Gillespie County, TX, Grimes County, TX, Guadalupe County, TX, Hamilton County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Houston County, TX, Irion County, TX, Johnson County, TX, Kaufman County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Madison County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Medina County, TX, Menard County, TX, Milam County, TX, Mills County, TX, Navarro County, TX, Reagan County, TX, Real County, TX, Robertson County, TX, Rockwall County, TX, San Saba County, TX, Schleicher County, TX, Smith County, TX, Somervell County, TX, Sutton County, TX, Tom Green County, TX, Travis County, TX, Trinity County, TX, Uvalde County, TX, Van Zandt County, TX, Walker County, TX, Washington County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 106 km from the middle of the area, began a volume at 08:44 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

Fort Worth, TX (KFWD), launched 00:00Z, 8.7 hours before the alert went out and 188 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, Fort Worth, TX at 00:00Z on 2007-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3576 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, Fort Worth, TX at 00:00Z on 2007-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.1939Sfc1 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
3576 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1390 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jun 19, 7:39 PM CDTMesoscale DiscussionSPCArmstrong, Carson, Dallam, Deaf Smith, Donley, Gray and 13 more66 min
Jun 19, 9:28 PM CDTMesoscale DiscussionSPCArmstrong, Carson, Collingsworth, Deaf Smith, Donley, Gray and 13 more62 min
Jun 19, 11:20 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Childress, Clay, Cottle, Crosby and 12 more6 hr
Jun 20, 12:49 AM CDTMesoscale DiscussionSPCArcher, Baylor, Borden, Brown, Callahan, Clay and 47 more56 min
Jun 20, 1:10 AM CDTSevere Thunderstorm WatchSPCBorden, Bosque, Brown, Callahan, Coke, Coleman and 47 more8 hr
Jun 20, 4:09 AM CDTMesoscale DiscussionSPCFannin, Grayson, Lamar96 min
Jun 20, 4:38 AM CDTSevere Thunderstorm WatchSPCAnderson, Bandera, Bastrop, Bell, Blanco, Brazos and 46 more6 hr
Jun 20, 6:24 AM CDTMesoscale DiscussionSPCEdwards, Kinney, Real, Sutton, Terrell, Val Verde66 min
Jun 20, 6:42 AM CDTMesoscale DiscussionSPCBastrop, Bell, Caldwell, Falls, Hays, Lee and 4 more93 min
Jun 20, 10:21 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Atascosa, Austin, Bastrop, Bexar and 60 more54 min
Jun 20, 2:39 PM CDTMesoscale DiscussionSPCEl Paso, Hudspeth96 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.