Alert archive / Mississippi / Mesoscale Discussions in 2015

Mesoscale Discussion 268

April 9, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2015, 10:01 PM CDT for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Apr 9, 2015, 10:01 PM CDT (03:01 UTC)
Expired
Apr 10, 2015, 12:00 AM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 56 counties

Arkansas County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Greene County, AR, Jackson County, AR, Lee County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 43 km from the middle of the area, began a volume at 03:05 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

Little Rock, AR (KBYH), launched 00:00Z, 3.0 hours before the alert went out and 15 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 2015-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 928 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 2015-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 156 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
928 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
873 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
156 m²/s²
0-3 km storm-relative helicity
232 m²/s²
Significant tornado parameter
0.6
Supercell composite
7.1

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 9, 8:26 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Columbia, Drew, Ouachita, Union94 min
Apr 9, 9:23 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 12 more67 min
Apr 10, 12:53 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 12 more2 hr
Apr 10, 12:05 PM CDTMesoscale DiscussionSPCForrest, George, Greene, Hancock, Harrison, Jackson and 8 more85 min
Apr 10, 3:38 PM CDTMesoscale DiscussionSPCGeorge, Greene, Hancock, Harrison, Jackson, Pearl River and 1 more97 min
Apr 9, 8:01 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Madison, Mississippi, Perry, Sainte Genevieve and 2 more89 min
Apr 10, 1:54 AM CDTMesoscale DiscussionSPCBedford, Bledsoe, Cannon, Cheatham, Clay, Coffee and 33 more96 min
Apr 10, 3:09 AM CDTSevere Thunderstorm WatchSPCAnderson, Bledsoe, Campbell, Cannon, Claiborne, Clay and 15 more5 hr
Apr 10, 5:16 AM CDTMesoscale DiscussionSPCAnderson, Blount, Campbell, Claiborne, Grainger, Greene and 10 more59 min

Nearby

Mesoscale Discussions in Mississippi, 2015Mesoscale Discussions in Tennessee, 2015Mesoscale Discussions in Arkansas, 2015Every mesoscale discussion in 2015

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.