Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 613

May 9, 20138 counties in Oklahoma; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2013, 5:38 PM CDT for 8 counties in Oklahoma; 10 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: May 9, 2013, 5:38 PM CDT (22:38 UTC)
Expired: May 9, 2013, 6:45 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Beckham County, OK, Caddo County, OK, Comanche County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Donley County, TX, Floyd County, TX, Hall County, TX, Hardeman County, TX, Motley County, TX

The radar

The Altus AFB radar (KFDR), 119 km from the middle of the area, began a volume at 22:37 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, 10.6 hours before the alert went out and 278 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: 162 J/kg
Mixed-layer CIN: -316 J/kg
Mixed-layer LCL: 887 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 390 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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
May 8, 8:56 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 27 more	94 min
May 9, 12:53 AM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Cleveland, Creek, Custer and 12 more	2 hr
May 9, 6:39 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Comanche, Concho and 13 more	3 hr
May 9, 9:37 AM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Brown, Burnet, Coleman, Comanche and 15 more	113 min
May 9, 11:52 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Brown, Burnet, Callahan and 44 more	9 hr
May 9, 2:52 PM CDT	Mesoscale Discussion	SPC	Angelina, Brazos, Grimes, Hardin, Houston, Jasper and 12 more	53 min
May 9, 3:19 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brown, Burnet, Callahan and 42 more	56 min
May 9, 3:34 PM CDT	Severe Thunderstorm Watch	SPC	Angelina, Brazos, Burleson, Chambers, Cherokee, Gregg and 25 more	6 hr
May 9, 6:12 PM CDT	Mesoscale Discussion	SPC	Anderson, Atascosa, Bandera, Bexar, Blanco, Brown and 47 more	63 min
May 9, 6:40 PM CDT	Mesoscale Discussion	SPC	Angelina, Cherokee, Hardin, Jasper, Liberty, Montgomery and 10 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2013 Mesoscale Discussions in Oklahoma, 2013 Every mesoscale discussion in 2013

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.