Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 657

May 2, 2007Bryan County, Marshall County, Oklahoma; 39 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 2, 2007, 9:30 PM CDT for Bryan County, Marshall County, Oklahoma; 39 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
May 2, 2007, 9:30 PM CDT (02:30 UTC)
Expired
May 2, 2007, 10:30 PM CDT
In force
60 min
Issued by
the Storm Prediction Center
All 41 counties

Bryan County, OK, Marshall County, OK, Anderson County, TX, Bell County, TX, Bosque County, TX, Collin County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Parker County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 48 km from the middle of the area, began a volume at 02:30 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 nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 2.5 hours before the alert went out and 306 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, Shreveport, LA at 00:00Z on 2007-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1137 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, Shreveport, LA at 00:00Z on 2007-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 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
1137 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
1161 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
170 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.8

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 2, 7:24 PM CDTMesoscale DiscussionSPCLove96 min
May 2, 7:59 PM CDTTornado WatchSPCMcCurtain7 hr
May 2, 11:09 PM CDTMesoscale DiscussionSPCMcCurtain96 min
May 2, 9:10 PM CDTMesoscale DiscussionSPCBrewster, Crane, Pecos, Reeves, Terrell, Ward65 min
May 2, 9:57 PM CDTMesoscale DiscussionSPCAransas, Bee, Brazoria, Calhoun, Chambers, Fort Bend and 21 more63 min
May 2, 10:19 PM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 16 more6 hr
May 2, 10:48 PM CDTTornado WatchSPCAransas, Bee, Brooks, Calhoun, Cameron, DeWitt and 17 more5 hr
May 2, 11:48 PM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 13 more87 min
May 3, 12:01 AM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 13 more89 min
May 3, 1:21 AM CDTMesoscale DiscussionSPCHarrison, Panola, Sabine, San Augustine, Shelby84 min
May 3, 1:52 AM CDTMesoscale DiscussionSPCCameron, Kenedy, Willacy83 min
May 3, 12:08 PM CDTMesoscale DiscussionSPCBosque, Burnet, Coryell, Hamilton, Hood, Johnson and 7 more97 min
May 3, 2:19 PM CDTMesoscale DiscussionSPCAustin, Chambers, Colorado, Fort Bend, Hardin, Harris and 10 more86 min
May 3, 3:08 PM CDTTornado WatchSPCAngelina, Austin, Brazoria, Brazos, Burleson, Chambers and 26 more7 hr
May 3, 6:34 PM CDTMesoscale DiscussionSPCAngelina, Brazos, Burleson, Chambers, Grimes, Hardin and 19 more116 min
May 3, 6:49 PM CDTMesoscale DiscussionSPCBosque, Dallas, Hamilton, Johnson56 min

Nearby

Mesoscale Discussions in Texas, 2007Mesoscale Discussions in Oklahoma, 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.