Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 846

June 23, 201830 counties in Oklahoma; Hardeman County, Wilbarger County, Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2018, 7:50 PM CDT for 30 counties in Oklahoma; Hardeman County, Wilbarger County, Texas. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Jun 23, 2018, 7:50 PM CDT (00:50 UTC)
Expired
Jun 23, 2018, 8:45 PM CDT
In force
55 min
Issued by
the Storm Prediction Center
All 32 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, Johnston County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Hardeman County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 84 km from the middle of the area, began a volume at 00:53 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, 0.8 hours before the alert went out and 89 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 2018-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3256 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 2018-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
3256 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1229 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
1.6
Supercell composite
9.8

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
Jun 23, 9:32 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Blaine, Canadian, Custer, Dewey and 16 more118 min
Jun 23, 9:52 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Blaine, Custer, Dewey, Ellis and 13 more7 hr
Jun 24, 1:25 AM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Blaine, Canadian, Cleveland, Creek and 25 more95 min
Jun 24, 3:23 AM CDTSevere Thunderstorm WatchSPCCanadian, Cherokee, Creek, Haskell, Hughes, Latimer and 19 more6 hr
Jun 24, 5:11 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Cleveland, Creek, Haskell, Hughes and 13 more79 min
Jun 24, 5:28 AM CDTSevere Thunderstorm WatchSPCAdair, McCurtain, Pushmataha4 hr
Jun 24, 7:17 AM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 14 more118 min
Jun 24, 7:37 AM CDTMesoscale DiscussionSPCMcCurtain113 min
Jun 24, 12:57 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cleveland, Comanche, Cotton and 15 more93 min
Jun 24, 2:40 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Garvin and 15 more5 hr
Jun 24, 3:04 PM CDTMesoscale DiscussionSPCCimarron86 min
Jun 24, 4:18 PM CDTMesoscale DiscussionSPCBryan, Choctaw, LeFlore, McCurtain, Pushmataha117 min
Jun 24, 4:53 PM CDTSevere Thunderstorm WatchSPCMcCurtain6 hr
Jun 23, 8:33 PM CDTMesoscale DiscussionSPCCoke, Fisher, Haskell, Jones, Mitchell, Nolan and 4 more117 min
Jun 24, 1:53 AM CDTMesoscale DiscussionSPCBosque, Comanche, Dallas, Eastland, Ellis, Erath and 12 more67 min
Jun 24, 5:50 PM CDTMesoscale DiscussionSPCFisher, Glasscock, Howard, Kent, Mitchell, Reagan and 4 more115 min

Nearby

Mesoscale Discussions in Oklahoma, 2018Mesoscale Discussions in Texas, 2018Every mesoscale discussion in 2018

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.