Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 953

June 30, 201831 counties in Oklahoma; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2018, 12:43 PM CDT for 31 counties in Oklahoma; 10 counties in Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2018, 12:43 PM CDT (17:43 UTC)
Expired: Jun 30, 2018, 2:15 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 41 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, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Jackson County, OK, Jefferson County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pottawatomie County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Hardeman County, TX, Jack County, TX, Montague County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 50 km from the middle of the area, began a volume at 17:44 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.

Severe Thunderstorm Watch 248Jun 30, 3:50 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 5.7 hours before the alert went out and 125 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1104 J/kg
Mixed-layer CIN: -172 J/kg
Mixed-layer LCL: 1066 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 26 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.

Issued	Product	Office	Counties	Lasted
Jun 30, 3:15 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Cleveland, Creek, Garfield and 17 more	90 min
Jun 30, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Canadian, Cleveland, Creek, Garfield and 14 more	5 hr
Jun 30, 6:15 PM CDT	Mesoscale Discussion	SPC	Cleveland, Coal, Creek, Garfield, Garvin, Grant and 20 more	90 min
Jun 30, 5:12 PM CDT	Mesoscale Discussion	SPC	Borden, Coke, Crockett, Crosby, Dickens, Fisher and 22 more	93 min
Jun 30, 6:58 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 29 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2018 Mesoscale Discussions in Texas, 2018 Every 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.