Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 2301

November 8, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Nov 8, 2011, 10:31 AM CST for 4 states. It was in force for 29 min.

The area

The outline as issued.

The facts

Issued
Nov 8, 2011, 10:31 AM CST (16:31 UTC)
Expired
Nov 8, 2011, 11:00 AM CST
In force
29 min
Issued by
the Storm Prediction Center
All 60 counties

Baxter County, AR, Clark County, AR, Cleburne County, AR, Columbia County, AR, Conway County, AR, Dallas County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Izard County, AR, Johnson County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Marion County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Stone County, AR, Van Buren County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Webster Parish, LA, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Hopkins County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Western Arkansas radar (KSRX), 126 km from the middle of the area, began a volume at 16:31 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

Shreveport, LA (KSHV), launched 12:00Z, 4.5 hours before the alert went out and 198 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 12:00Z on 2011-11-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 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 12:00Z on 2011-11-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 296 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
12 J/kg
Mixed-layer CIN
-185 J/kg
Mixed-layer LCL
496 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
296 m²/s²
0-3 km storm-relative helicity
361 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
Nov 8, 1:17 AM CSTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 16 more118 min
Nov 8, 9:38 AM CSTMesoscale DiscussionSPCCrawford, Franklin, Sebastian67 min
Nov 8, 10:49 AM CSTTornado WatchSPCClark, Cleburne, Columbia, Conway, Dallas, Faulkner and 25 more7 hr
Nov 8, 1:03 PM CSTMesoscale DiscussionSPCCalhoun, Clark, Columbia, Conway, Dallas, Faulkner and 22 more57 min
Nov 8, 3:48 PM CSTMesoscale DiscussionSPCClark, Cleburne, Columbia, Conway, Faulkner, Garland and 18 more87 min
Nov 8, 5:09 PM CSTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 7 more66 min
Nov 8, 5:30 PM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 17 more7 hr
Nov 7, 7:43 PM CSTMesoscale DiscussionSPCCaddo, Canadian, Cleveland, Comanche, Cotton, Creek and 22 more62 min
Nov 7, 8:28 PM CSTTornado WatchSPCAdair, Caddo, Canadian, Carter, Cherokee, Cleveland and 36 more8 hr
Nov 7, 11:20 PM CSTMesoscale DiscussionSPCCarter, Cherokee, Cleveland, Cotton, Craig, Creek and 22 more85 min
Nov 8, 2:12 AM CSTMesoscale DiscussionSPCAtoka, Bryan, Carter, Coal, Jefferson, Johnston and 4 more93 min
Nov 7, 6:44 PM CSTTornado WatchSPCBosque, Camp, Collin, Cooke, Coryell, Dallas and 24 more2 hr
Nov 7, 8:53 PM CSTMesoscale DiscussionSPCBorden, Coke, Fisher, Glasscock, Haskell, Howard and 9 more2 hr
Nov 7, 9:16 PM CSTTornado WatchSPCBorden, Callahan, Coke, Coleman, Concho, Crane and 31 more8 hr
Nov 8, 1:44 PM CSTMesoscale DiscussionSPCAustin, Chambers, Grimes, Hardin, Harris, Jasper and 10 more61 min
Nov 8, 1:59 PM CSTTornado WatchSPCChambers, Grimes, Hardin, Harris, Houston, Jasper and 12 more6 hr
Nov 8, 3:53 PM CSTMesoscale DiscussionSPCAngelina, Grimes, Hardin, Harris, Jasper, Liberty and 7 more2 hr

Nearby

Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Louisiana, 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.