Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 928

May 30, 20074 parishes in Louisiana; 51 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 30, 2007, 11:07 AM CDT for 4 parishes in Louisiana; 51 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 30, 2007, 11:07 AM CDT (16:07 UTC)
Expired
May 30, 2007, 12:30 PM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 55 counties

Beauregard Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Sabine Parish, LA, Anderson County, TX, Angelina County, TX, Austin County, TX, Brazos County, TX, Burleson County, TX, Camp County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, Falls County, TX, Fort Bend County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Henderson County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Kaufman County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Navarro County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 183 km from the middle of the area, began a volume at 16:07 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 12:00Z, 4.1 hours before the alert went out and 192 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 12:00Z on 2007-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 733 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 12:00Z on 2007-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 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
733 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
565 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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
May 30, 1:23 PM CDTMesoscale DiscussionSPCBeauregard, Calcasieu97 min
May 29, 7:53 PM CDTMesoscale DiscussionSPCBell, Brown, Burnet, Coleman, Coryell, Lampasas and 5 more2 hr
May 29, 9:02 PM CDTMesoscale DiscussionSPCHansford, Lipscomb, Ochiltree, Sherman118 min
May 30, 1:52 AM CDTMesoscale DiscussionSPCArmstrong, Carson, Collingsworth, Donley, Gray, Hemphill and 1 more83 min
May 30, 4:11 AM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Foard, Hardeman, Wichita and 1 more94 min
May 30, 4:50 AM CDTSevere Thunderstorm WatchSPCClay, Collin, Cooke, Dallas, Denton, Fannin and 8 more6 hr
May 30, 7:42 AM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 11 more93 min
May 30, 8:59 AM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Austin, Bell, Bosque, Bowie and 63 more5 hr
May 30, 6:13 PM CDTMesoscale DiscussionSPCBandera, Brown, Callahan, Coleman, Comanche, Concho and 18 more92 min

Nearby

Mesoscale Discussions in Texas, 2007Mesoscale Discussions in Louisiana, 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.