Alert archive / Oklahoma / Mesoscale Discussions in 2019

Mesoscale Discussion 699

May 20, 201926 counties in Oklahoma; Hardeman County, Wichita County, Wilbarger County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 20, 2019, 11:17 AM CDT for 26 counties in Oklahoma; Hardeman County, Wichita County, Wilbarger County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 20, 2019, 11:17 AM CDT (16:17 UTC)
Expired
May 20, 2019, 1:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 29 counties

Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pottawatomie County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Hardeman County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 91 km from the middle of the area, began a volume at 16:19 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, 4.3 hours before the alert went out and 75 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 2019-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 79 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 2019-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 260 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
79 J/kg
Mixed-layer CIN
-389 J/kg
Mixed-layer LCL
1022 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
260 m²/s²
0-3 km storm-relative helicity
302 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

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 19, 11:56 PM CDTMesoscale DiscussionSPCCimarron2 hr
May 20, 1:57 AM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas8 hr
May 20, 6:14 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 7 more2 hr
May 20, 7:09 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 11 more6 hr
May 20, 10:41 AM CDTMesoscale DiscussionSPCBeckham, Greer, Harmon, Jackson, Roger Mills3 hr
May 20, 11:35 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Creek, Custer, Dewey, Ellis and 20 more85 min
May 20, 1:21 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Cleveland, Comanche, Grady, Kiowa and 3 more24 min
May 20, 1:37 PM CDTTornado Watch PDSSPCAtoka, Beckham, Blaine, Bryan, Caddo, Canadian and 41 more8 hr
May 20, 2:15 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Cimarron, Ellis, Grant, Harper and 3 more90 min
May 20, 3:46 PM CDTMesoscale DiscussionSPCCanadian, Greer, Harmon, Jackson, Kingfisher, Kiowa and 1 more59 min
May 20, 4:35 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, Mayes, Ottawa and 2 more115 min
May 20, 5:14 PM CDTTornado WatchSPCAdair, Cherokee, Craig, Delaware, Haskell, Latimer and 11 more8 hr
May 20, 5:44 PM CDTMesoscale DiscussionSPCCanadian, Greer, Harmon, Jackson, Kingfisher, Kiowa and 1 more61 min
May 19, 7:21 PM CDTMesoscale DiscussionSPCHarrison, Panola84 min
May 20, 12:36 PM CDTTornado Watch PDSSPCArmstrong, Borden, Briscoe, Childress, Collingsworth, Cottle and 34 more9 hr
May 20, 1:37 PM CDTMesoscale DiscussionSPCBriscoe, Childress, Collingsworth, Cottle, Crosby, Dickens and 11 more53 min
May 20, 5:08 PM CDTMesoscale DiscussionSPCCrane, Crockett, Glasscock, Midland, Reagan, Terrell and 1 more2 hr
May 20, 5:50 PM CDTMesoscale DiscussionSPCBorden, Childress, Collingsworth, Cottle, Crosby, Dawson and 18 more115 min

Nearby

Mesoscale Discussions in Oklahoma, 2019Mesoscale Discussions in Texas, 2019Every mesoscale discussion in 2019

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.