Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 990

June 12, 20158 counties in Oklahoma; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2015, 3:30 PM CDT for 8 counties in Oklahoma; 5 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 12, 2015, 3:30 PM CDT (20:30 UTC)
Expired: Jun 12, 2015, 5:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Beckham County, OK, Custer County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK, Childress County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, Wilbarger County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 295Jun 12, 3:55 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 8.5 hours before the alert went out and 194 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: 153 J/kg
Mixed-layer CIN: -247 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -81 m²/s²
0-3 km storm-relative helicity: -39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 7:10 PM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Harper, Texas	95 min
Jun 11, 9:48 PM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Harper, Texas	87 min
Jun 11, 11:10 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Texas, Woodward	65 min
Jun 12, 3:52 PM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Mayes, Nowata, Ottawa, Rogers and 2 more	83 min
Jun 12, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 25 more	6 hr
Jun 12, 6:23 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 22 more	97 min
Jun 12, 1:44 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Borden, Cochran, Crane, Dawson and 17 more	2 hr
Jun 12, 2:47 PM CDT	Tornado Watch	SPC	Andrews, Armstrong, Bailey, Borden, Brewster, Briscoe and 45 more	7 hr
Jun 12, 5:39 PM CDT	Mesoscale Discussion	SPC	Andrews, Armstrong, Borden, Briscoe, Castro, Cochran and 30 more	96 min

Nearby

Mesoscale Discussions in Oklahoma, 2015 Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.