Alert archive / Mississippi / Mesoscale Discussions in 2017

Mesoscale Discussion 893

May 28, 20174 states

The Storm Prediction Center issued this mesoscale discussion at May 28, 2017, 2:11 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 28, 2017, 2:11 AM CDT (07:11 UTC)
Expired
May 28, 2017, 4:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 82 counties

Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Arkansas County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Faulkner County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Phillips County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, White County, AR, Carroll County, GA, Floyd County, GA, Haralson County, GA, Heard County, GA, Polk County, GA, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Monroe County, MS, Montgomery County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 72 km from the middle of the area, began a volume at 07:10 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

Little Rock, AR (KBYH), launched 00:00Z, 7.2 hours before the alert went out and 112 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, Little Rock, AR at 00:00Z on 2017-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3385 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, Little Rock, AR at 00:00Z on 2017-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
3385 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
1096 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
2.5
Supercell composite
15.1

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, 9:07 PM CDTSevere Thunderstorm WatchSPCBlount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 13 more8 hr
May 27, 11:46 PM CDTMesoscale DiscussionSPCBibb, Calhoun, Clay, Cleburne, Fayette, Jefferson and 8 more59 min
May 28, 2:53 AM CDTSevere Thunderstorm WatchSPCCalhoun, Chambers, Chilton, Clay, Cleburne, Coosa and 6 more4 hr
May 28, 10:59 AM CDTMesoscale DiscussionSPCBaldwin, Covington, Escambia, Geneva, Mobile2 hr
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, 2:53 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 6 more2 hr
May 28, 4:59 AM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 9 more2 hr
May 27, 10:16 PM CDTMesoscale DiscussionSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens89 min
May 27, 11:13 PM CDTSevere Thunderstorm WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens3 hr
May 28, 5:29 AM CDTMesoscale DiscussionSPCBaldwin, Bibb, Butts, Clayton, Cobb, Coweta and 21 more2 hr

Nearby

Mesoscale Discussions in Mississippi, 2017Mesoscale Discussions in Alabama, 2017Mesoscale Discussions in Arkansas, 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.