Alert archive / Arkansas / Mesoscale Discussions in 2016

Mesoscale Discussion 495

April 29, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2016, 9:46 AM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2016, 9:46 AM CDT (14:46 UTC)
Expired
Apr 29, 2016, 11:15 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 59 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Coahoma County, MS, Washington County, MS, Bowie County, TX, Cass County, TX, Harrison County, TX, Marion County, TX, Morris County, TX

The radar

The Shreveport radar (KSHV), 131 km from the middle of the area, began a volume at 14:45 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, 2.8 hours before the alert went out and 123 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 2016-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1756 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 2016-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 310 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
1756 J/kg
Mixed-layer CIN
-129 J/kg
Mixed-layer LCL
632 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
310 m²/s²
0-3 km storm-relative helicity
451 m²/s²
Significant tornado parameter
0.9
Supercell composite
14.9

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 1:58 AM CDTMesoscale DiscussionSPCClark, Columbia, Dallas, Garland, Hempstead, Hot Spring and 11 more2 hr
Apr 29, 4:21 AM CDTSevere Thunderstorm WatchSPCArkansas, Clark, Cleveland, Conway, Crawford, Dallas and 25 more6 hr
Apr 29, 7:06 AM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Dallas and 5 more54 min
Apr 29, 12:51 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Columbia, Hempstead, Howard and 8 more114 min
Apr 29, 1:43 PM CDTTornado WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more8 hr
Apr 29, 5:42 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more93 min
Apr 29, 12:37 PM CDTMesoscale DiscussionSPCEast Carroll, Madison83 min
Apr 29, 4:29 PM CDTMesoscale DiscussionSPCLowndes, Noxubee91 min
Apr 28, 7:52 PM CDTMesoscale DiscussionSPCBell, Brazos, Burleson, Burnet, Coryell, Falls and 7 more83 min
Apr 28, 10:31 PM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 30 more89 min
Apr 28, 10:54 PM CDTSevere Thunderstorm WatchSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 36 more7 hr
Apr 29, 2:59 AM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Carson, Castro, Cochran and 18 more91 min
Apr 29, 4:54 AM CDTMesoscale DiscussionSPCArmstrong, Borden, Briscoe, Carson, Castro, Childress and 28 more66 min
Apr 29, 7:38 AM CDTMesoscale DiscussionSPCBriscoe, Cottle, Crosby, Dickens, Floyd, Foard and 10 more97 min
Apr 29, 12:52 PM CDTMesoscale DiscussionSPCBell, Blanco, Bosque, Brown, Burnet, Comanche and 22 more113 min
Apr 29, 1:08 PM CDTTornado WatchSPCAnderson, Bell, Bosque, Collin, Comanche, Cooke and 35 more9 hr
Apr 29, 1:40 PM CDTMesoscale DiscussionSPCCooke, Fannin, Grayson, Wichita, Wilbarger65 min
Apr 29, 1:57 PM CDTTornado WatchSPCClay, Wichita, Wilbarger8 hr
Apr 29, 3:34 PM CDTMesoscale DiscussionSPCBell, Bosque, Collin, Cooke, Coryell, Dallas and 31 more86 min
Apr 29, 6:16 PM CDTMesoscale DiscussionSPCCollin, Cooke, Delta, Denton, Fannin, Grayson and 3 more89 min

Nearby

Mesoscale Discussions in Arkansas, 2016Mesoscale Discussions in Louisiana, 2016Mesoscale Discussions in Texas, 2016Every mesoscale discussion in 2016

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.