Alert archive / Mississippi / Mesoscale Discussions in 2018

Mesoscale Discussion 251

April 14, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2018, 2:10 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 14, 2018, 2:10 AM CDT (07:10 UTC)
Expired
Apr 14, 2018, 4:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 76 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Phillips County, AR, Union County, AR, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Claiborne County, MS, Coahoma County, MS, Copiah County, MS, DeSoto County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lafayette County, MS, Leflore County, MS, Madison County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Yalobusha County, MS, Yazoo County, MS, Hardin County, TX, Jasper County, TX, Newton County, TX

The radar

The Jackson/Brandon,MS radar (KDGX), 154 km from the middle of the area, began a volume at 07:12 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

Jackson, MS (KJAN), launched 00:00Z, 7.2 hours before the alert went out and 144 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, Jackson, MS at 00:00Z on 2018-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 92 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2018-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 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
92 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
1418 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Apr 13, 7:06 PM CDTMesoscale DiscussionSPCHoward, Montgomery, Yell24 min
Apr 13, 7:22 PM CDTTornado WatchSPCArkansas, Ashley, Chicot, Desha, Drew, Lincoln and 1 more3 hr
Apr 13, 8:36 PM CDTMesoscale DiscussionSPCGarland, Howard, Pike54 min
Apr 13, 8:54 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 47 more66 min
Apr 13, 9:53 PM CDTTornado WatchSPCArkansas, Baxter, Bradley, Calhoun, Clark, Cleburne and 37 more8 hr
Apr 13, 10:12 PM CDTTornado WatchSPCAshley, Chicot, Clay, Craighead, Crittenden, Cross and 8 more10 hr
Apr 14, 6:37 AM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 20 more83 min
Apr 14, 6:57 AM CDTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 22 more7 hr
Apr 14, 4:35 AM CDTMesoscale DiscussionSPCAlcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 32 more115 min
Apr 14, 9:40 AM CDTMesoscale DiscussionSPCGeorge, Greene, Jackson95 min
Apr 14, 10:36 AM CDTTornado WatchSPCGeorge, Greene, Harrison, Jackson, Perry, Stone and 1 more8 hr
Apr 14, 12:41 PM CDTMesoscale DiscussionSPCGeorge, Greene, Jackson94 min
Apr 14, 2:56 PM CDTMesoscale DiscussionSPCJackson94 min
Apr 14, 6:17 PM CDTMesoscale DiscussionSPCGeorge, Jackson118 min
Apr 14, 6:55 PM CDTTornado WatchSPCGeorge, Greene6 hr

Nearby

Mesoscale Discussions in Mississippi, 2018Mesoscale Discussions in Louisiana, 2018Mesoscale Discussions in Arkansas, 2018Every mesoscale discussion in 2018

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.