Alert archive / Oklahoma / Mesoscale Discussions in 2014

Mesoscale Discussion 334

April 13, 201431 counties in Oklahoma; Wichita County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2014, 12:26 PM CDT for 31 counties in Oklahoma; Wichita County, Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2014, 12:26 PM CDT (17:26 UTC)
Expired: Apr 13, 2014, 2:00 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 32 counties

Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Washington County, OK, Wichita County, TX

The radar

The Norman radar (KTLX), 21 km from the middle of the area, began a volume at 17:28 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.

Tornado Watch 74Apr 13, 2:00 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 5.4 hours before the alert went out and 6 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: 275 J/kg
Mixed-layer CIN: -227 J/kg
Mixed-layer LCL: 1301 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 456 m²/s²
0-3 km storm-relative helicity: 480 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 13, 1:56 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 39 more	8 hr
Apr 13, 3:09 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Creek, Garvin, Grady, Lincoln and 12 more	96 min
Apr 13, 4:13 PM CDT	Mesoscale Discussion	SPC	Adair, Delaware, Ottawa, Sequoyah	32 min
Apr 13, 4:27 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Cherokee, Delaware, Ottawa	7 hr
Apr 13, 5:13 PM CDT	Tornado Watch	SPC	McCurtain	6 hr
Apr 13, 6:01 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Delaware, Ottawa	59 min
Apr 13, 6:25 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Canadian, Carter, Choctaw, Cleveland and 45 more	65 min
Apr 13, 1:43 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 7 more	2 hr
Apr 13, 2:34 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Falls and 20 more	2 hr
Apr 13, 4:54 PM CDT	Mesoscale Discussion	SPC	Anderson, Bosque, Bowie, Camp, Cass, Cherokee and 34 more	66 min

Nearby

Mesoscale Discussions in Oklahoma, 2014 Mesoscale Discussions in Texas, 2014 Every mesoscale discussion in 2014

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.