Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 1186

June 11, 201141 counties in Arkansas; 5 counties in Missouri; 5 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2011, 4:57 PM CDT for 41 counties in Arkansas; 5 counties in Missouri; 5 counties in Oklahoma. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Jun 11, 2011, 4:57 PM CDT (21:57 UTC)
Expired
Jun 11, 2011, 6:00 PM CDT
In force
63 min
Issued by
the Storm Prediction Center
All 51 counties

Baxter County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crawford County, AR, Cross County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Logan County, AR, Lonoke County, AR, Marion County, AR, Mississippi County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Butler County, MO, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Sequoyah County, OK

The radar

The Little Rock radar (KLZK), 76 km from the middle of the area, began a volume at 21:58 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

Springfield, MO (KSGF), launched 12:00Z, 10.0 hours before the alert went out and 195 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 2011-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1495 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 2011-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 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
1495 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
825 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.5

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
Jun 10, 7:47 PM CDTMesoscale DiscussionSPCAudrain, Barton, Bates, Benton, Boone, Callaway and 42 more58 min
Jun 10, 10:56 PM CDTMesoscale DiscussionSPCBarton, Camden, Cedar, Cole, Crawford, Dade and 30 more94 min
Jun 10, 8:50 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Grady, Greer, Harmon, Jackson and 3 more55 min
Jun 11, 12:44 PM CDTMesoscale DiscussionSPCBeaver, Cimarron, Texas91 min
Jun 11, 1:09 PM CDTSevere Thunderstorm WatchSPCCimarron7 hr
Jun 11, 2:28 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Carter, Cleveland and 25 more2 hr
Jun 11, 3:39 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Beckham, Blaine, Cimarron, Custer and 9 more9 hr
Jun 11, 5:43 PM CDTMesoscale DiscussionSPCBeaver, Blaine, Caddo, Cimarron, Custer, Dewey and 8 more62 min

Nearby

Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Oklahoma, 2011Every mesoscale discussion in 2011

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.