Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 594

April 26, 201121 counties in Oklahoma; 22 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2011, 3:15 PM CDT for 21 counties in Oklahoma; 22 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Apr 26, 2011, 3:15 PM CDT (20:15 UTC)
Expired
Apr 26, 2011, 4:45 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 43 counties

Beckham County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Ellis County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, McClain County, OK, Pottawatomie County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hardeman County, TX, Hemphill County, TX, Hutchinson County, TX, Knox County, TX, Lipscomb County, TX, Motley County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 102 km from the middle of the area, began a volume at 20:16 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

Norman, OK (KOUN), launched 12:00Z, 8.3 hours before the alert went out and 185 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, Norman, OK at 12:00Z on 2011-04-26Temperature 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, Norman, OK at 12:00Z on 2011-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -58 square meters per square second.1939587897117Sfc1 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
882 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
-58 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 26, 1:11 PM CDTMesoscale DiscussionSPCBryan, Choctaw, McCurtain2 hr
Apr 26, 1:44 PM CDTTornado Watch PDSSPCMcCurtain10 hr
Apr 26, 3:43 PM CDTSevere Thunderstorm WatchSPCAtoka, Beckham, Bryan, Caddo, Carter, Coal and 20 more6 hr
Apr 26, 3:59 PM CDTMesoscale DiscussionSPCMcCurtain91 min
Apr 26, 5:00 PM CDTMesoscale DiscussionSPCHaskell, Latimer, LeFlore, McIntosh, Pushmataha, Sequoyah30 min
Apr 26, 5:08 PM CDTTornado WatchSPCChoctaw, Haskell, Latimer, LeFlore, Pittsburg, Pushmataha and 1 more5 hr
Apr 26, 6:17 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, LeFlore, McCurtain and 6 more118 min
Apr 25, 7:34 PM CDTMesoscale DiscussionSPCCamp, Cass, Marion, Morris116 min
Apr 25, 9:37 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Cherokee, Ellis, Freestone, Gregg and 26 more83 min
Apr 25, 10:47 PM CDTTornado WatchSPCHardin, Jasper, Newton, Tyler5 hr
Apr 26, 1:34 AM CDTMesoscale DiscussionSPCHardin, Jasper, Newton, San Jacinto, Tyler86 min
Apr 26, 1:52 AM CDTSevere Thunderstorm WatchSPCChambers, Hardin, Harris, Jasper, Jefferson, Liberty and 4 more5 hr
Apr 26, 3:01 PM CDTMesoscale DiscussionSPCAtascosa, Austin, Bastrop, Bee, Bexar, Blanco and 22 more89 min
Apr 26, 4:56 PM CDTTornado WatchSPCAngelina, Austin, Bastrop, Brazos, Burleson, Fayette and 23 more5 hr
Apr 26, 6:43 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Austin, Bastrop, Bell, Bowie and 64 more2 hr

Nearby

Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Oklahoma, 2011Every mesoscale discussion in 2011

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.