Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 726

May 23, 201528 counties in Oklahoma; 40 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 23, 2015, 5:04 PM CDT for 28 counties in Oklahoma; 40 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 23, 2015, 5:04 PM CDT (22:04 UTC)
Expired
May 23, 2015, 7:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 68 counties

Bryan County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Harmon County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Bosque County, TX, Childress County, TX, Clay County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Cottle County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Foard County, TX, Grayson County, TX, Hall County, TX, Hamilton County, TX, Hardeman County, TX, Hill County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, King County, TX, Knox County, TX, Lampasas County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 73 km from the middle of the area, began a volume at 22:06 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, 10.1 hours before the alert went out and 170 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 2015-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 187 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, Norman, OK at 12:00Z on 2015-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.19395878Sfc1 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
187 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
453 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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 23, 12:17 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Greer, Harmon, Jackson, Kiowa and 2 more2 hr
May 23, 1:16 PM CDTTornado WatchSPCComanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more6 hr
May 23, 3:44 PM CDTMesoscale DiscussionSPCComanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more2 hr
May 23, 5:30 PM CDTTornado WatchSPCAtoka, Bryan, Caddo, Canadian, Carter, Cleveland and 21 more9 hr
May 23, 6:37 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cleveland, Coal, Comanche and 30 more83 min
May 23, 6:53 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Craig, Creek, Delaware and 19 more9 hr
May 22, 7:06 PM CDTMesoscale DiscussionSPCCrane, Ector, Loving, Pecos, Reeves, Ward and 1 more114 min
May 23, 12:35 AM CDTMesoscale DiscussionSPCBailey, Castro, Cochran, Deaf Smith, Hockley, Lamb and 6 more115 min
May 23, 5:38 AM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Collingsworth, Donley and 9 more97 min
May 23, 2:02 PM CDTMesoscale DiscussionSPCBrewster, Coke, Concho, Crane, Crockett, Ector and 28 more88 min
May 23, 3:04 PM CDTTornado WatchSPCAndrews, Borden, Brewster, Brown, Callahan, Coke and 49 more6 hr
May 23, 6:06 PM CDTMesoscale DiscussionSPCAndrews, Atascosa, Bandera, Bexar, Blanco, Borden and 61 more114 min
May 23, 6:19 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 30 more9 hr

Nearby

Mesoscale Discussions in Texas, 2015Mesoscale Discussions in Oklahoma, 2015Every mesoscale discussion in 2015

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.