Alert archive / Arkansas / Mesoscale Discussions in 2013

Mesoscale Discussion 922

June 1, 201311 counties in Arkansas; 9 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2013, 2:19 AM CDT for 11 counties in Arkansas; 9 counties in Oklahoma. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jun 1, 2013, 2:19 AM CDT (07:19 UTC)
Expired: Jun 1, 2013, 4:15 AM CDT
In force: 116 min
Issued by: the Storm Prediction Center

Counties Boone County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Coal County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 74 km from the middle of the area, began a volume at 07:19 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, 7.3 hours before the alert went out and 207 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, 11:08 PM CDT	Mesoscale Discussion	SPC	Crawford, Sebastian	67 min
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, 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 Arkansas, 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.