Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 696

May 23, 202020 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 23, 2020, 8:48 PM CDT for 20 counties in Oklahoma; 6 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
May 23, 2020, 8:48 PM CDT (01:48 UTC)
Expired
May 23, 2020, 10:45 PM CDT
In force
117 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 209...210
All 26 counties

Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Clay County, TX, Montague County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 79 km from the middle of the area, began a volume at 01:49 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 00:00Z, 1.8 hours before the alert went out and 127 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 00:00Z on 2020-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2884 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 00:00Z on 2020-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.193958Sfc1 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
2884 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
1309 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 23, 9:33 PM CDTSevere Thunderstorm WatchSPCCaddo, Canadian, Carter, Cleveland, Comanche, Cotton and 13 more4 hr
May 23, 11:36 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Comanche, Cotton, Grady, Jefferson and 2 more114 min
May 24, 2:28 PM CDTMesoscale DiscussionSPCCimarron2 hr
May 24, 2:58 PM CDTMesoscale DiscussionSPCAdair, LeFlore, Sequoyah2 hr
May 24, 3:07 PM CDTMesoscale DiscussionSPCBeaver83 min
May 24, 3:26 PM CDTSevere Thunderstorm WatchSPCBeaver, Beckham, Ellis, Harper, Roger Mills7 hr
May 24, 6:39 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Ellis, Harper, Roger Mills2 hr
May 24, 12:21 PM CDTMesoscale DiscussionSPCBorden, Coke, Crane, Crockett, Dawson, Glasscock and 13 more114 min
May 24, 12:39 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Austin, Bowie, Brazos, Burleson and 60 more96 min
May 24, 1:58 PM CDTSevere Thunderstorm WatchSPCBorden, Brewster, Coke, Crane, Crockett, Dawson and 19 more6 hr
May 24, 3:48 PM CDTMesoscale DiscussionSPCBorden, Coke, Crane, Crockett, Dawson, Fisher and 20 more87 min
May 24, 5:28 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Dimmit, Duval, Edwards and 20 more2 hr
May 24, 5:56 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bexar, Brooks, Dimmit, Duval and 17 more6 hr
May 24, 6:58 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 15 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2020Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020

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.