Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 919

May 31, 2013Crawford County, Sebastian County, Arkansas; 29 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 31, 2013, 11:08 PM CDT for Crawford County, Sebastian County, Arkansas; 29 counties in Oklahoma. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: May 31, 2013, 11:08 PM CDT (04:08 UTC)
Expired: Jun 1, 2013, 12:15 AM CDT
In force: 67 min
Issued by: the Storm Prediction Center

All 31 counties

Crawford County, AR, Sebastian County, AR, Adair County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Craig County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Lincoln County, OK, Logan County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Wagoner County, OK

The radar

The Norman radar (KTLX), 80 km from the middle of the area, began a volume at 04:08 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.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.1 hours before the alert went out and 94 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: 3260 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 866 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 294 m²/s²
0-3 km storm-relative helicity: 400 m²/s²
Significant tornado parameter: 6.9
Supercell composite: 29.0

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
May 31, 11:23 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 11 more	5 hr
Jun 1, 1:51 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Madison, Marion, Washington	114 min
Jun 1, 2:19 AM CDT	Mesoscale Discussion	SPC	Boone, Crawford, Franklin, Johnson, Logan, Madison and 5 more	116 min
Jun 1, 3:46 AM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Crawford and 24 more	29 min
Jun 1, 9:53 AM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Craighead and 22 more	2 hr
May 31, 8:02 PM CDT	Mesoscale Discussion	SPC	Canadian, Carter, Cleveland, Craig, Creek, Garvin and 17 more	58 min
May 31, 11:46 PM CDT	Severe Thunderstorm Watch	SPC	Blaine, Caddo, Canadian, Cleveland, Grady, Hughes and 9 more	5 hr
Jun 1, 2:30 AM CDT	Mesoscale Discussion	SPC	Blaine, Canadian, Cleveland, Hughes, Kingfisher, Lincoln and 6 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2013 Mesoscale Discussions in Arkansas, 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.