Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 689

May 10, 201711 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 10, 2017, 5:58 PM CDT for 11 counties in Oklahoma; 9 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 10, 2017, 5:58 PM CDT (22:58 UTC)
Expired: May 10, 2017, 8:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Beckham County, OK, Caddo County, OK, Comanche County, OK, Cotton County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Collingsworth County, TX, Donley County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 40 km from the middle of the area, began a volume at 23:02 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.0 hours before the alert went out and 195 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: 614 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 611 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.4

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
May 9, 10:59 PM CDT	Severe Thunderstorm Watch	SPC	Beaver	8 hr
May 10, 6:04 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Custer, Dewey, Ellis, Grant and 5 more	116 min
May 10, 2:14 PM CDT	Mesoscale Discussion	SPC	Beckham, Caddo, Canadian, Comanche, Cotton, Custer and 8 more	61 min
May 10, 2:43 PM CDT	Tornado Watch	SPC	Caddo, Comanche, Cotton, Grady, Greer, Harmon and 5 more	7 hr
May 10, 3:11 PM CDT	Mesoscale Discussion	SPC	Beaver, Texas	94 min
May 10, 3:37 PM CDT	Mesoscale Discussion	SPC	Craig, Grant, Kay, Noble, Nowata, Osage and 3 more	113 min
May 10, 5:27 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Texas	3 hr
May 9, 8:41 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Castro, Cochran, Deaf Smith, Ector and 10 more	2 hr
May 9, 10:17 PM CDT	Mesoscale Discussion	SPC	Andrews, Armstrong, Bailey, Briscoe, Carson, Castro and 19 more	28 min
May 10, 2:04 AM CDT	Mesoscale Discussion	SPC	Andrews, Armstrong, Bailey, Briscoe, Castro, Cochran and 21 more	86 min
May 10, 2:25 PM CDT	Mesoscale Discussion	SPC	Menard, Schleicher, Sutton, Val Verde	3 hr

Nearby

Mesoscale Discussions in Oklahoma, 2017 Mesoscale Discussions in Texas, 2017 Every mesoscale discussion in 2017

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.