Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 565

May 9, 201526 counties in Arkansas; LeFlore County, McCurtain County, Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2015, 1:58 PM CDT for 26 counties in Arkansas; LeFlore County, McCurtain County, Oklahoma; 6 counties in Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 9, 2015, 1:58 PM CDT (18:58 UTC)
Expired: May 9, 2015, 3:30 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 34 counties

Clark County, AR, Conway County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Van Buren County, AR, Yell County, AR, LeFlore County, OK, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Morris County, TX, Red River County, TX, Titus County, TX

The radar

The Western Arkansas radar (KSRX), 109 km from the middle of the area, began a volume at 18:59 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 151May 9, 2:40 PM CDT

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 7.0 hours before the alert went out and 209 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: 1263 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 612 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.0

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 8, 10:43 PM CDT	Mesoscale Discussion	SPC	Clark, Garland, Hempstead, Howard, Lafayette, Little River and 8 more	92 min
May 9, 9:41 AM CDT	Mesoscale Discussion	SPC	Howard, Little River, Polk, Sevier	2 hr
May 9, 2:40 PM CDT	Tornado Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 13 more	7 hr
May 9, 5:06 PM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 18 more	54 min
May 9, 5:52 PM CDT	Mesoscale Discussion	SPC	Clark, Columbia, Hempstead, Lafayette, Little River, Miller and 2 more	83 min
May 8, 7:27 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Creek and 18 more	6 hr
May 9, 3:11 AM CDT	Severe Thunderstorm Watch	SPC	Beaver, Cimarron, Texas	8 hr
May 9, 4:03 AM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more	57 min
May 9, 5:51 AM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Blaine, Cimarron, Comanche, Custer and 14 more	84 min
May 9, 7:36 AM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 22 more	6 hr
May 9, 11:36 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Comanche, Cotton, Greer and 7 more	84 min
May 9, 1:21 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Caddo, Canadian, Carter, Cleveland and 23 more	10 hr
May 9, 3:32 PM CDT	Mesoscale Discussion	SPC	Bryan, Carter, Coal, Cotton, Garvin, Hughes and 10 more	118 min
May 9, 4:52 PM CDT	Mesoscale Discussion	SPC	Beckham, Greer, Harmon, Roger Mills	83 min
May 8, 8:42 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Callahan, Coke, Coleman, Concho and 28 more	2 hr
May 8, 10:48 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Callahan, Coke, Crane, Crockett and 26 more	87 min
May 9, 2:34 AM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Castro, Cochran, Dallam, Dawson and 14 more	116 min
May 9, 6:21 PM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Comanche, Eastland, Erath, Hood and 6 more	84 min

Nearby

Mesoscale Discussions in Arkansas, 2015 Mesoscale Discussions in Texas, 2015 Mesoscale Discussions in Oklahoma, 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.