Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 1044

June 11, 200922 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2009, 7:39 AM CDT for 22 counties in Texas. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Jun 11, 2009, 7:39 AM CDT (12:39 UTC)
Expired
Jun 11, 2009, 8:45 AM CDT
In force
66 min
Issued by
the Storm Prediction Center
All 22 counties

Anderson County, TX, Collin County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Henderson County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Stephens County, TX, Tarrant County, TX, Throckmorton County, TX, Van Zandt County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 15 km from the middle of the area, began a volume at 12:42 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 12:00Z, 0.7 hours before the alert went out and 14 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 12:00Z on 2009-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1544 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 12:00Z on 2009-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 544 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
1544 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
556 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
544 m²/s²
0-3 km storm-relative helicity
715 m²/s²
Significant tornado parameter
3.1
Supercell composite
55.5

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
Jun 10, 8:39 PM CDTMesoscale DiscussionSPCBosque, Bowie, Camp, Cass, Collin, Dallas and 29 more66 min
Jun 10, 11:07 PM CDTMesoscale DiscussionSPCBowie, Cass, Harrison, Marion, Morris, Nacogdoches and 2 more83 min
Jun 10, 11:49 PM CDTSevere Thunderstorm WatchSPCNacogdoches, Shelby5 hr
Jun 11, 2:55 AM CDTMesoscale DiscussionSPCCherokee, Dallas, Ellis, Henderson, Kaufman, Navarro and 5 more65 min
Jun 11, 3:11 AM CDTSevere Thunderstorm WatchSPCAnderson, Cherokee, Collin, Dallas, Denton, Ellis and 15 more7 hr
Jun 11, 5:22 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Cherokee, Dallas, Denton, Ellis and 29 more53 min
Jun 11, 5:42 AM CDTSevere Thunderstorm WatchSPCAngelina, Freestone, Hardin, Houston, Leon, Limestone and 6 more4 hr
Jun 11, 7:55 AM CDTMesoscale DiscussionSPCAngelina, Hardin, Houston, Polk, San Jacinto, Trinity and 2 more65 min
Jun 11, 10:10 AM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Bosque, Brazos, Cherokee, Collin and 41 more8 hr
Jun 11, 1:10 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Bosque, Cherokee, Collin, Dallas and 37 more65 min
Jun 11, 2:05 PM CDTMesoscale DiscussionSPCBell, Brown, Burnet, Callahan, Coleman, Comanche and 25 more55 min
Jun 11, 2:32 PM CDTTornado WatchSPCBastrop, Bell, Blanco, Bosque, Brown, Burnet and 38 more7 hr
Jun 11, 3:43 PM CDTMesoscale DiscussionSPCArmstrong, Carson, Donley, Gray, Hemphill, Hutchinson and 4 more92 min
Jun 11, 5:41 PM CDTMesoscale DiscussionSPCAnderson, Bell, Blanco, Bosque, Brazos, Brown and 53 more64 min

Nearby

Mesoscale Discussions in Texas, 2009Every mesoscale discussion in 2009

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.