Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 857

June 24, 201821 counties in Oklahoma; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2018, 12:57 PM CDT for 21 counties in Oklahoma; 5 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Jun 24, 2018, 12:57 PM CDT (17:57 UTC)
Expired
Jun 24, 2018, 2:30 PM CDT
In force
93 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 26 counties

Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pottawatomie County, OK, Stephens County, OK, Tillman County, OK, Clay County, TX, Foard County, TX, Hardeman County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 64 km from the middle of the area, began a volume at 18:00 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, 6.0 hours before the alert went out and 109 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 2018-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 67 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 2018-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -49 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
67 J/kg
Mixed-layer CIN
-259 J/kg
Mixed-layer LCL
1329 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
-49 m²/s²
0-3 km storm-relative helicity
392 m²/s²
Significant tornado parameter
0.0
Supercell composite
12.0

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 23, 7:50 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more55 min
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, 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.