Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 1911

August 9, 201132 counties in Arkansas; 7 counties in Mississippi; 16 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2011, 2:21 AM CDT for 32 counties in Arkansas; 7 counties in Mississippi; 16 counties in Oklahoma. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Aug 9, 2011, 2:21 AM CDT (07:21 UTC)
Expired
Aug 9, 2011, 3:45 AM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 55 counties

Arkansas County, AR, Benton County, AR, Carroll County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Jefferson County, AR, Johnson County, AR, Lee County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Monroe County, AR, Newton County, AR, Perry County, AR, Phillips County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, St. Francis County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Coahoma County, MS, DeSoto County, MS, Panola County, MS, Quitman County, MS, Tate County, MS, Tunica County, MS, Yalobusha County, MS, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 97 km from the middle of the area, began a volume at 07:24 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 00:00Z, 7.4 hours before the alert went out and 177 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 00:00Z on 2011-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 275 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 00:00Z on 2011-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 217 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
275 J/kg
Mixed-layer CIN
-241 J/kg
Mixed-layer LCL
1182 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
217 m²/s²
0-3 km storm-relative helicity
247 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Aug 8, 7:34 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 30 more116 min
Aug 8, 7:53 PM CDTSevere Thunderstorm WatchSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 12 more7 hr
Aug 8, 8:39 PM CDTSevere Thunderstorm WatchSPCArkansas, Desha, Jefferson, Lee, Lincoln, Monroe and 2 more6 hr
Aug 8, 11:00 PM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clark, Cleburne, Cleveland and 32 more2 hr
Aug 8, 11:27 PM CDTMesoscale DiscussionSPCArkansas, Desha, Lee, Lincoln, Monroe, Phillips93 min
Aug 9, 1:20 PM CDTMesoscale DiscussionSPCClarke, Hinds, Jasper, Kemper, Lauderdale, Leake and 9 more115 min
Aug 9, 4:46 PM CDTSevere Thunderstorm WatchSPCGeorge, Greene, Perry, Stone, Wayne4 hr
Aug 9, 5:01 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Comanche and 12 more59 min
Aug 9, 5:16 PM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas8 hr

Nearby

Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Mississippi, 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.