Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 705

May 19, 201520 counties in Oklahoma; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 19, 2015, 11:15 PM CDT for 20 counties in Oklahoma; 14 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 19, 2015, 11:15 PM CDT (04:15 UTC)
Expired: May 20, 2015, 12:45 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center

All 34 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Cooke County, TX, Cottle County, TX, Fannin County, TX, Foard County, TX, Grayson County, TX, Hardeman County, TX, Knox County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX

The radar

The Altus AFB radar (KFDR), 66 km from the middle of the area, began a volume at 04:14 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

Fort Worth, TX (KFWD), launched 00:00Z, 4.3 hours before the alert went out and 174 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: 1306 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 832 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 427 m²/s²
Significant tornado parameter: 2.4
Supercell composite: 26.2

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
May 19, 7:15 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Cotton, Garvin, Jefferson, Love and 6 more	90 min
May 19, 8:58 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Carter, Coal, Comanche, Cotton and 13 more	5 hr
May 19, 9:18 PM CDT	Mesoscale Discussion	SPC	Love	87 min
May 20, 1:10 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Coal, Cotton, Jefferson and 6 more	95 min
May 20, 1:35 PM CDT	Mesoscale Discussion	SPC	Crane, Pecos, Terrell, Upton	2 hr
May 20, 5:07 PM CDT	Mesoscale Discussion	SPC	Brewster, Crockett, Edwards, Kerr, Kimble, Kinney and 7 more	53 min
May 20, 5:29 PM CDT	Severe Thunderstorm Watch	SPC	Brewster, Concho, Crane, Crockett, Edwards, Irion and 13 more	6 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.