Alert archive / Oklahoma / Mesoscale Discussions in 2016

Mesoscale Discussion 638

May 17, 201615 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 17, 2016, 2:08 AM CDT for 15 counties in Oklahoma; 7 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2016, 2:08 AM CDT (07:08 UTC)
Expired: May 17, 2016, 4:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 22 counties

Carter County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Clay County, TX, Cooke County, TX, Foard County, TX, Hardeman County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 70 km from the middle of the area, began a volume at 07:09 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 00:00Z, 7.1 hours before the alert went out and 113 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: 490 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.6

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 16, 7:23 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Custer, Dewey, Ellis and 5 more	67 min
May 16, 8:59 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more	6 hr
May 16, 9:59 PM CDT	Mesoscale Discussion	SPC	Beckham, Roger Mills	31 min
May 16, 11:53 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Garvin, Grady, McClain and 1 more	67 min
May 16, 11:58 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Briscoe, Childress, Clay, Cottle and 7 more	5 hr
May 17, 1:52 PM CDT	Mesoscale Discussion	SPC	Bandera, Crane, Crockett, Edwards, Irion, Kerr and 8 more	113 min
May 17, 2:25 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bexar, Blanco, Brewster, Comal and 34 more	13 hr
May 17, 5:18 PM CDT	Mesoscale Discussion	SPC	Bee, Duval, Jim Wells, Live Oak, Webb	57 min
May 17, 5:38 PM CDT	Mesoscale Discussion	SPC	Bandera, Crockett, Dimmit, Edwards, Frio, Gillespie and 17 more	97 min
May 17, 6:20 PM CDT	Severe Thunderstorm Watch	SPC	Brooks, Duval, Hidalgo, Jim Hogg, La Salle, McMullen and 3 more	5 hr

Nearby

Mesoscale Discussions in Oklahoma, 2016 Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.