Alert archive / Arkansas / Mesoscale Discussions in 2013

Mesoscale Discussion 896

May 30, 201342 counties in Arkansas; Adair County, LeFlore County, Sequoyah County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 11:28 PM CDT for 42 counties in Arkansas; Adair County, LeFlore County, Sequoyah County, Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 30, 2013, 11:28 PM CDT (04:28 UTC)
Expired
May 31, 2013, 1:30 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 45 counties

Arkansas County, AR, Baxter County, AR, Boone County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lawrence County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Marion County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Adair County, OK, LeFlore County, OK, Sequoyah County, OK

The radar

The Little Rock radar (KLZK), 44 km from the middle of the area, began a volume at 04:27 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

Shreveport, LA (KSHV), launched 00:00Z, 4.5 hours before the alert went out and 285 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, Shreveport, LA at 00:00Z on 2013-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1600 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, Shreveport, LA at 00:00Z on 2013-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 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
1600 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
1217 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.8
Supercell composite
7.1

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 30, 8:09 PM CDTMesoscale DiscussionSPCArkansas, Benton, Cleburne, Cleveland, Conway, Crawford and 30 more66 min
May 30, 8:46 PM CDTTornado WatchSPCArkansas, Baxter, Benton, Boone, Bradley, Calhoun and 58 more7 hr
May 31, 1:57 AM CDTMesoscale DiscussionSPCArkansas, Baxter, Clay, Cleburne, Conway, Craighead and 40 more93 min
May 31, 3:32 AM CDTMesoscale DiscussionSPCCleburne, Conway, Craighead, Cross, Faulkner, Garland and 16 more28 min
May 30, 9:03 PM CDTMesoscale DiscussionSPCCarter, Coal, Garvin, Hughes, Johnston, McIntosh and 6 more57 min
May 31, 1:49 PM CDTMesoscale DiscussionSPCCraig, Delaware, Nowata, Ottawa116 min
May 31, 2:40 PM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 29 more95 min
May 31, 3:27 PM CDTTornado Watch PDSSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 36 more9 hr
May 31, 4:58 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cleveland, Coal, Comanche and 29 more92 min
May 31, 6:33 PM CDTMesoscale DiscussionSPCCanadian, Cleveland, Kingfisher, Logan, Noble, Oklahoma and 3 more27 min

Nearby

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