Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 895

May 28, 201715 counties in Arkansas; 6 counties in Mississippi; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 28, 2017, 4:59 AM CDT for 15 counties in Arkansas; 6 counties in Mississippi; 13 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 28, 2017, 4:59 AM CDT (09:59 UTC)
Expired
May 28, 2017, 7:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 34 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Lafayette County, AR, Lincoln County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bolivar County, MS, Coahoma County, MS, Humphreys County, MS, Leflore County, MS, Sunflower County, MS, Washington County, MS, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Delta County, TX, Denton County, TX, Franklin County, TX, Hopkins County, TX, Hunt County, TX, Morris County, TX, Rains County, TX, Rockwall County, TX, Titus County, TX

The radar

The Shreveport radar (KSHV), 104 km from the middle of the area, began a volume at 10:01 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

Shreveport, LA (KBAD), launched 00:00Z, 10.0 hours before the alert went out and 101 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 00:00Z on 2017-05-28Temperature 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, Shreveport, LA at 00:00Z on 2017-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
0 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.0

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
May 27, 7:01 PM CDTTornado WatchSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 20 more6 hr
May 27, 9:26 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Independence and 8 more94 min
May 27, 9:59 PM CDTTornado WatchSPCCrittenden, Cross, Lee, St. Francis2 hr
May 27, 11:47 PM CDTMesoscale DiscussionSPCCrawford, Sebastian, Washington58 min
May 28, 12:06 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Columbia, Crawford, Franklin, Hempstead and 10 more5 hr
May 28, 12:18 AM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 36 more6 hr
May 28, 12:52 AM CDTMesoscale DiscussionSPCHoward, Montgomery, Polk23 min
May 28, 2:11 AM CDTMesoscale DiscussionSPCArkansas, Clark, Cleveland, Dallas, Desha, Faulkner and 12 more2 hr
May 28, 2:53 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 6 more2 hr
May 27, 11:46 PM CDTMesoscale DiscussionSPCCalhoun, Carroll, Chickasaw, Choctaw, Clay, Grenada and 12 more59 min
May 28, 10:59 AM CDTMesoscale DiscussionSPCGeorge, Hancock, Harrison, Jackson, Pearl River, Stone2 hr
May 27, 7:12 PM CDTMesoscale DiscussionSPCDallam, Hansford, Hartley, Ochiltree, Sherman2 hr
May 27, 9:07 PM CDTMesoscale DiscussionSPCHansford, Hemphill, Hutchinson, Lipscomb, Ochiltree, Roberts and 1 more53 min
May 28, 1:34 PM CDTMesoscale DiscussionSPCBastrop, Bell, Bexar, Blanco, Burnet, Caldwell and 18 more56 min
May 28, 3:09 PM CDTSevere Thunderstorm WatchSPCAnderson, Atascosa, Austin, Bandera, Bastrop, Bell and 58 more8 hr
May 28, 5:01 PM CDTMesoscale DiscussionSPCGregg, Harrison, Marion, Nacogdoches, Panola, Rusk and 1 more59 min
May 28, 5:19 PM CDTSevere Thunderstorm WatchSPCAngelina, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 6 more4 hr
May 28, 6:03 PM CDTMesoscale DiscussionSPCAnderson, Bandera, Bastrop, Bell, Bexar, Blanco and 40 more57 min

Nearby

Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Mississippi, 2017Every mesoscale discussion in 2017

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.