Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 837

May 29, 20154 states

The Storm Prediction Center issued this mesoscale discussion at May 29, 2015, 4:48 PM CDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 29, 2015, 4:48 PM CDT (21:48 UTC)
Expired
May 29, 2015, 6:15 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 43 counties

Benton County, AR, Boone County, AR, Carroll County, AR, Clark County, AR, Crawford County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Howard County, AR, Johnson County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Christian County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Choctaw County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Sequoyah County, OK, Bowie County, TX, Red River County, TX

The radar

The Western Arkansas radar (KSRX), 34 km from the middle of the area, began a volume at 21:48 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

Springfield, MO (KSGF), launched 12:00Z, 9.8 hours before the alert went out and 219 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2015-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 535 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2015-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
535 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
864 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
May 29, 12:33 PM CDTMesoscale DiscussionSPCCalhoun, Clark, Columbia, Conway, Dallas, Franklin and 24 more87 min
May 29, 2:09 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Hempstead, Howard and 12 more5 hr
May 29, 6:31 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Bradley, Calhoun, Clark, Cleburne and 17 more3 hr
May 28, 9:58 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Johnston, Marshall2 hr
May 29, 2:27 PM CDTMesoscale DiscussionSPCCimarron93 min
May 29, 3:44 PM CDTSevere Thunderstorm WatchSPCCimarron7 hr
May 28, 7:58 PM CDTSevere Thunderstorm WatchSPCBandera, Blanco, Coleman, Concho, Crockett, Edwards and 16 more5 hr
May 28, 10:19 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bastrop, Bexar, Burnet, Caldwell, Comal and 20 more7 hr
May 29, 1:22 AM CDTMesoscale DiscussionSPCAtascosa, Bee, Brooks, Dimmit, Duval, Hidalgo and 12 more83 min

Nearby

Mesoscale Discussions in Arkansas, 2015Mesoscale Discussions in Missouri, 2015Mesoscale Discussions in Oklahoma, 2015Every 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.