Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 431

April 27, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2014, 6:11 PM CDT for 4 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Apr 27, 2014, 6:11 PM CDT (23:11 UTC)
Expired
Apr 27, 2014, 7:15 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 73 counties

Arkansas County, AR, Baxter County, AR, Benton County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Carroll County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Drew County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Johnson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Marion County, AR, Miller County, AR, Monroe 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, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Webster Parish, LA, Adair County, OK, Haskell County, OK, LeFlore County, OK, McCurtain County, OK, Sequoyah County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX, Upshur County, TX

The radar

The Western Arkansas radar (KSRX), 133 km from the middle of the area, began a volume at 23:14 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 (KBAD), launched 12:00Z, 11.2 hours before the alert went out and 188 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 2014-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2045 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 2014-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 225 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
2045 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
645 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
225 m²/s²
0-3 km storm-relative helicity
395 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.5

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
Apr 27, 6:05 AM CDTMesoscale DiscussionSPCArkansas, Chicot, Desha, Jefferson, Lee, Lincoln and 4 more55 min
Apr 27, 12:25 PM CDTMesoscale DiscussionSPCCalhoun, Clark, Cleveland, Columbia, Conway, Crawford and 29 more2 hr
Apr 27, 1:46 PM CDTTornado WatchSPCArkansas, Baxter, Benton, Boone, Bradley, Calhoun and 55 more9 hr
Apr 27, 3:36 PM CDTTornado Watch PDSSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 33 more7 hr
Apr 27, 4:52 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 52 more53 min
Apr 27, 6:26 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Cleburne, Crawford and 12 more8 hr
Apr 27, 4:21 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Calcasieu, Concordia, East Baton Rouge and 12 more114 min
Apr 27, 5:09 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Cleveland, Comanche and 26 more96 min
Apr 27, 5:33 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 51 more6 hr
Apr 27, 7:55 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Canadian, Carter, Cherokee, Choctaw and 45 more95 min
Apr 27, 10:06 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Cherokee, Choctaw, Coal, Craig and 16 more84 min
Apr 27, 4:57 PM CDTMesoscale DiscussionSPCOttawa63 min
Apr 27, 6:10 PM CDTMesoscale DiscussionSPCOttawa95 min
Apr 27, 9:03 AM CDTMesoscale DiscussionSPCAnderson, Collin, Dallas, Delta, Ellis, Falls and 15 more27 min
Apr 27, 9:16 AM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Collin, Delta, Falls, Fannin and 16 more6 hr
Apr 27, 11:27 AM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Camp, Collin, Coryell and 27 more93 min
Apr 27, 2:56 PM CDTSevere Thunderstorm WatchSPCDelta, Ellis, Fannin, Henderson, Hopkins, Hunt and 6 more5 hr
Apr 27, 5:14 PM CDTMesoscale DiscussionSPCDelta, Falls, Freestone, Henderson, Hopkins, Hunt and 6 more91 min
Apr 27, 6:28 PM CDTMesoscale DiscussionSPCBastrop, Brazos, Burleson, Caldwell, Fayette, Lee and 3 more92 min

Nearby

Mesoscale Discussions in Arkansas, 2014Mesoscale Discussions in Texas, 2014Mesoscale Discussions in Oklahoma, 2014Every mesoscale discussion in 2014

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.