Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 718

May 5, 200930 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 5, 2009, 9:14 PM CDT for 30 counties in Texas. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued
May 5, 2009, 9:14 PM CDT (02:14 UTC)
Expired
May 5, 2009, 9:45 PM CDT
In force
31 min
Issued by
the Storm Prediction Center
All 30 counties

Archer County, TX, Baylor County, TX, Bosque County, TX, Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Coryell County, TX, Eastland County, TX, Erath County, TX, Fisher County, TX, Hamilton County, TX, Haskell County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Knox County, TX, Mills County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 9 km from the middle of the area, began a volume at 02:14 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, 2.2 hours before the alert went out and 194 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 2009-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2348 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 2009-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 217 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
2348 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
779 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
217 m²/s²
0-3 km storm-relative helicity
367 m²/s²
Significant tornado parameter
5.0
Supercell composite
16.1

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
May 5, 7:19 PM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coke, Coleman, Comanche and 19 more86 min
May 5, 10:27 PM CDTSevere Thunderstorm WatchSPCBowie, Red River8 hr
May 5, 11:03 PM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Denton, Fannin and 8 more117 min
May 5, 11:26 PM CDTSevere Thunderstorm WatchSPCArcher, Clay, Collin, Cooke, Dallas, Delta and 21 more6 hr
May 6, 12:54 AM CDTTornado WatchSPCBowie, Red River5 hr
May 6, 2:00 AM CDTMesoscale DiscussionSPCDelta, Fannin, Grayson, Lamar2 hr
May 6, 3:05 AM CDTMesoscale DiscussionSPCBowie, Red River115 min
May 6, 5:08 AM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Cooke, Delta and 22 more97 min
May 6, 5:29 AM CDTSevere Thunderstorm WatchSPCAngelina, Bowie, Camp, Cass, Cherokee, Clay and 32 more8 hr
May 6, 6:58 AM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Franklin, Gregg, Harrison and 6 more3 hr

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.