Alert archive / Mississippi / Mesoscale Discussions in 2020

Mesoscale Discussion 400

April 19, 20205 counties in Alabama; 9 counties in Arkansas; 35 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2020, 2:34 AM CDT for 5 counties in Alabama; 9 counties in Arkansas; 35 counties in Mississippi. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Apr 19, 2020, 2:34 AM CDT (07:34 UTC)
Expired
Apr 19, 2020, 4:30 AM CDT
In force
116 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 49 counties

Fayette County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Tuscaloosa County, AL, Arkansas County, AR, Ashley County, AR, Bradley County, AR, Chicot County, AR, Cleveland County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Phillips County, AR, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Itawamba County, MS, Kemper County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 140 km from the middle of the area, began a volume at 07:38 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, 7.6 hours before the alert went out and 134 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 2020-04-19Temperature 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, Jackson, MS at 00:00Z on 2020-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 square meters per square second.1939587897117Sfc1 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
1408 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
191 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 19, 3:03 PM CDTMesoscale DiscussionSPCAutauga, Butler, Choctaw, Clarke, Coffee, Conecuh and 12 more117 min
Apr 19, 3:56 PM CDTTornado WatchSPCAutauga, Barbour, Bullock, Butler, Choctaw, Clarke and 20 more6 hr
Apr 19, 5:52 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Butler, Choctaw, Clarke, Coffee and 11 more83 min
Apr 18, 8:27 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 5 more2 hr
Apr 19, 11:19 AM CDTMesoscale DiscussionSPCClark, Columbia, Hempstead, Howard, Lafayette, Little River and 7 more116 min
Apr 18, 8:56 PM CDTMesoscale DiscussionSPCAmite, Hancock, Harrison, Pearl River, Pike, Walthall and 1 more2 hr
Apr 19, 11:06 AM CDTMesoscale DiscussionSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 21 more54 min
Apr 19, 11:45 AM CDTTornado WatchSPCAdams, Amite, Attala, Claiborne, Clarke, Copiah and 33 more9 hr
Apr 19, 12:47 PM CDTMesoscale DiscussionSPCAdams, Wilkinson58 min
Apr 19, 2:39 PM CDTTornado WatchSPCAmite, Hancock, Harrison, Jackson, Pearl River, Pike and 2 more9 hr
Apr 19, 3:07 PM CDTMesoscale DiscussionSPCClaiborne, Clarke, Copiah, Covington, Franklin, Hinds and 18 more113 min
Apr 19, 5:40 PM CDTMesoscale DiscussionSPCAdams, Amite, Claiborne, Franklin, Jefferson, Wilkinson2 hr
Apr 19, 6:37 PM CDTMesoscale DiscussionSPCForrest, Greene, Lamar, Marion, Pearl River, Perry and 3 more53 min

Nearby

Mesoscale Discussions in Mississippi, 2020Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Alabama, 2020Every mesoscale discussion in 2020

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.