Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 432

April 14, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2011, 11:11 PM CDT for 4 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Apr 14, 2011, 11:11 PM CDT (04:11 UTC)
Expired
Apr 15, 2011, 12:45 AM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 63 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Clark County, AR, Cleburne County, AR, Conway County, AR, Crawford 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, Little River County, AR, Logan County, AR, Madison 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, Washington County, AR, Yell County, AR, Barry County, MO, McDonald County, MO, Newton County, MO, Ozark County, MO, Stone County, MO, Taney County, MO, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Sequoyah County, OK, Bowie County, TX, Delta County, TX, Fannin County, TX, Lamar County, TX, Red River County, TX, Titus County, TX

The radar

The Western Arkansas radar (KSRX), 38 km from the middle of the area, began a volume at 04:12 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 00:00Z, 4.2 hours before the alert went out and 224 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 2011-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2194 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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
Apr 14, 7:33 PM CDTMesoscale DiscussionSPCBoone, Calhoun, Carroll, Clark, Cleburne, Cleveland and 34 more117 min
Apr 14, 9:06 PM CDTTornado WatchSPCBaxter, Benton, Boone, Bradley, Calhoun, Carroll and 45 more6 hr
Apr 15, 1:27 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleburne and 33 more93 min
Apr 15, 2:19 AM CDTTornado WatchSPCArkansas, Ashley, Baxter, Bradley, Calhoun, Chicot and 38 more8 hr
Apr 15, 12:29 PM CDTMesoscale DiscussionSPCClay, Crittenden, Mississippi61 min
Apr 15, 2:09 PM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 3 more7 hr
Apr 15, 3:32 PM CDTMesoscale DiscussionSPCClay, Greene58 min
Apr 15, 5:57 PM CDTMesoscale DiscussionSPCMississippi2 hr
Apr 15, 12:47 PM CDTTornado WatchSPCAudrain, Bollinger, Butler, Cape Girardeau, Carter, Crawford and 29 more9 hr
Apr 14, 8:36 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Cherokee, Choctaw, Coal, Delaware and 18 more84 min
Apr 14, 9:59 PM CDTMesoscale DiscussionSPCCollin, Dallas, Denton, Hopkins, Hunt, Rockwall31 min
Apr 14, 10:04 PM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Collin, Coryell, Dallas, Denton and 19 more4 hr
Apr 14, 11:24 PM CDTSevere Thunderstorm WatchSPCCamp, Cass, Cherokee, Gregg, Harrison, Marion and 7 more3 hr
Apr 14, 11:56 PM CDTMesoscale DiscussionSPCAnderson, Camp, Cass, Cherokee, Ellis, Freestone and 16 more94 min

Nearby

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