Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 477

April 13, 200719 counties in Oklahoma; 38 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2007, 5:34 AM CDT for 19 counties in Oklahoma; 38 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2007, 5:34 AM CDT (10:34 UTC)
Expired
Apr 13, 2007, 7:00 AM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 57 counties

Beaver County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Comanche County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Armstrong County, TX, Baylor County, TX, Briscoe County, TX, Callahan County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Dickens County, TX, Donley County, TX, Eastland County, TX, Floyd County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hardeman County, TX, Haskell County, TX, Hemphill County, TX, Hutchinson County, TX, Jones County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Motley County, TX, Ochiltree County, TX, Palo Pinto County, TX, Roberts County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Swisher County, TX, Throckmorton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 86 km from the middle of the area, began a volume at 10:33 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 10.6 hours before the alert went out and 181 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 00:00Z on 2007-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2007-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1743 m above ground
0-6 km bulk shear
81 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
584 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

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 12, 7:37 PM CDTMesoscale DiscussionSPCBeckham, Comanche, Cotton, Greer, Harmon, Jackson and 4 more113 min
Apr 12, 11:46 PM CDTSevere Thunderstorm WatchSPCGreer, Harmon, Jackson7 hr
Apr 13, 2:36 AM CDTMesoscale DiscussionSPCBeckham, Ellis, Greer, Harmon, Jackson, Kiowa and 1 more84 min
Apr 13, 12:37 PM CDTMesoscale DiscussionSPCAtoka, Caddo, Canadian, Carter, Choctaw, Cleveland and 30 more113 min
Apr 13, 1:59 PM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Blaine, Bryan, Caddo, Canadian and 44 more6 hr
Apr 13, 2:51 PM CDTMesoscale DiscussionSPCLove54 min
Apr 12, 9:35 PM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 35 more115 min
Apr 12, 11:31 PM CDTMesoscale DiscussionSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Carson and 38 more119 min
Apr 13, 12:12 PM CDTMesoscale DiscussionSPCArcher, Baylor, Fisher, Haskell, Hood, Jack and 8 more63 min
Apr 13, 12:27 PM CDTTornado WatchSPCArcher, Baylor, Brown, Callahan, Clay, Coke and 27 more7 hr
Apr 13, 5:08 PM CDTMesoscale DiscussionSPCAngelina, Chambers, Cherokee, Hardin, Harris, Harrison and 18 more97 min
Apr 13, 5:43 PM CDTTornado Watch PDSSPCBell, Bosque, Collin, Cooke, Coryell, Dallas and 22 more4 hr
Apr 13, 5:48 PM CDTTornado Watch PDSSPCAnderson, Angelina, Bowie, Brazos, Burleson, Camp and 39 more8 hr
Apr 13, 5:58 PM CDTMesoscale DiscussionSPCBandera, Blanco, Burnet, Edwards, Gillespie, Hays and 16 more62 min
Apr 13, 6:27 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more8 hr

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.