Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 467

April 26, 201512 counties in Oklahoma; Collingsworth County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2015, 2:04 PM CDT for 12 counties in Oklahoma; Collingsworth County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 26, 2015, 2:04 PM CDT (19:04 UTC)
Expired: Apr 26, 2015, 4:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

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, Jefferson County, OK, Kiowa County, OK, Stephens County, OK, Washita County, OK, Collingsworth County, TX

The radar

The Altus AFB radar (KFDR), 40 km from the middle of the area, began a volume at 19:06 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 120Apr 26, 2:50 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.1 hours before the alert went out and 248 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3257 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 26, 2:52 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Caddo, Comanche, Cotton, Greer, Harmon and 4 more	5 hr
Apr 26, 10:55 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Bosque, Brown, Callahan, Clay and 30 more	2 hr
Apr 26, 1:06 PM CDT	Tornado Watch	SPC	Archer, Baylor, Brown, Callahan, Childress, Clay and 27 more	7 hr
Apr 26, 2:54 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coleman and 27 more	2 hr
Apr 26, 3:18 PM CDT	Mesoscale Discussion	SPC	Armstrong, Carson, Dallam, Hartley, Moore, Potter	117 min
Apr 26, 4:54 PM CDT	Tornado Watch	SPC	Bell, Bosque, Comanche, Coryell, Dallas, Eastland and 17 more	6 hr
Apr 26, 5:24 PM CDT	Mesoscale Discussion	SPC	Brazoria, Chambers, Fort Bend, Galveston, Harris, Wharton	96 min
Apr 26, 5:39 PM CDT	Tornado Watch	SPC	Brazoria, Fort Bend, Galveston, Harris, Jackson, Matagorda and 1 more	2 hr
Apr 26, 5:51 PM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Comanche, Eastland, Erath, Hamilton	84 min
Apr 26, 6:44 PM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Concho, Kimble, McCulloch, Mason and 2 more	2 hr

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; radar from the NEXRAD Level II archive.