Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 832

June 22, 201813 counties in Arkansas; 50 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2018, 11:09 PM CDT for 13 counties in Arkansas; 50 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 22, 2018, 11:09 PM CDT (04:09 UTC)
Expired
Jun 23, 2018, 1:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 63 counties

Crawford County, AR, Garland County, AR, Hempstead County, AR, Howard County, AR, Little River County, AR, Logan County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Yell County, AR, Atoka County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Logan County, OK, Marshall County, OK, McClain County, OK, McCurtain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washita County, OK

The radar

The Norman radar (KTLX), 99 km from the middle of the area, began a volume at 04:08 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, 4.2 hours before the alert went out and 103 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 2018-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 495 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 2018-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
495 J/kg
Mixed-layer CIN
-405 J/kg
Mixed-layer LCL
1761 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
293 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 22, 11:48 PM CDTSevere Thunderstorm WatchSPCArkansas, Clark, Cleburne, Cleveland, Conway, Crawford and 33 more7 hr
Jun 23, 1:01 AM CDTMesoscale DiscussionSPCCrawford, Garland, Hempstead, Howard, Little River, Logan and 7 more59 min
Jun 23, 4:45 AM CDTMesoscale DiscussionSPCArkansas, Clark, Cleveland, Dallas, Garland, Grant and 14 more90 min
Jun 23, 7:17 AM CDTMesoscale DiscussionSPCArkansas, Lee, Monroe, Phillips, St. Francis, Woodruff118 min
Jun 23, 4:50 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 5 more115 min
Jun 22, 7:12 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 22 more2 hr
Jun 22, 9:07 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 38 more113 min
Jun 22, 9:27 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Choctaw, Cleveland, Coal and 38 more6 hr
Jun 23, 2:17 PM CDTMesoscale DiscussionSPCBeckham, Caddo, Canadian, Carter, Cleveland, Comanche and 20 more118 min
Jun 23, 2:36 PM CDTMesoscale DiscussionSPCCimarron114 min
Jun 23, 3:20 PM CDTSevere Thunderstorm WatchSPCCimarron7 hr
Jun 23, 3:56 PM CDTSevere Thunderstorm WatchSPCBeckham, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more6 hr
Jun 23, 6:37 PM CDTMesoscale DiscussionSPCCimarron, Texas113 min

Nearby

Mesoscale Discussions in Oklahoma, 2018Mesoscale Discussions in Arkansas, 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.