Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 696

April 23, 200811 counties in Oklahoma; 42 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2008, 7:31 AM CDT for 11 counties in Oklahoma; 42 counties in Texas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2008, 7:31 AM CDT (12:31 UTC)
Expired
Apr 23, 2008, 8:30 AM CDT
In force
59 min
Issued by
the Storm Prediction Center
All 53 counties

Beckham County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Armstrong County, TX, Baylor County, TX, Borden County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Hemphill County, TX, Howard County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Lubbock County, TX, Lynn County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Roberts County, TX, Scurry County, TX, Shackelford County, TX, Stonewall County, TX, Swisher County, TX, Taylor County, TX, Throckmorton County, TX, Wheeler County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 131 km from the middle of the area, began a volume at 12:30 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 0.5 hours before the alert went out and 168 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, Amarillo Airport, TX at 12:00Z on 2008-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1133 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, Amarillo Airport, TX at 12:00Z on 2008-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 224 square meters per square second.1939587897Sfc1 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
1133 J/kg
Mixed-layer CIN
-139 J/kg
Mixed-layer LCL
837 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
224 m²/s²
0-3 km storm-relative helicity
229 m²/s²
Significant tornado parameter
0.3
Supercell composite
7.4

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
Apr 23, 2:01 AM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 14 more89 min
Apr 23, 9:32 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Comanche and 21 more6 hr
Apr 23, 11:42 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cleveland, Coal, Garvin and 16 more2 hr
Apr 23, 3:37 PM CDTMesoscale DiscussionSPCAdair, Alfalfa, Beaver, Beckham, Blaine, Caddo and 43 more53 min
Apr 23, 3:52 PM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas4 hr
Apr 23, 9:59 AM CDTMesoscale DiscussionSPCBorden, Callahan, Coke, Dawson, Fisher, Garza and 18 more61 min
Apr 23, 10:07 AM CDTTornado WatchSPCAndrews, Borden, Coke, Concho, Crane, Dawson and 25 more6 hr
Apr 23, 1:35 PM CDTMesoscale DiscussionSPCAndrews, Borden, Coke, Crane, Dawson, Ector and 20 more85 min
Apr 23, 2:28 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 18 more3 hr
Apr 23, 3:16 PM CDTMesoscale DiscussionSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 34 more59 min
Apr 23, 3:25 PM CDTTornado WatchSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 44 more8 hr
Apr 23, 5:43 PM CDTMesoscale DiscussionSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 44 more92 min
Apr 23, 6:20 PM CDTTornado WatchSPCAnderson, Bosque, Collin, Coryell, Dallas, Delta and 24 more7 hr

Nearby

Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Oklahoma, 2008Every mesoscale discussion in 2008

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.