Alert archive / Missouri / Mesoscale Discussions in 2020

Mesoscale Discussion 314

April 8, 202020 counties in Illinois; Ballard County, Carlisle County, McCracken County, Kentucky; 21 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2020, 3:45 PM CDT for 20 counties in Illinois; Ballard County, Carlisle County, McCracken County, Kentucky; 21 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 8, 2020, 3:45 PM CDT (20:45 UTC)
Expired
Apr 8, 2020, 5:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 44 counties

Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Crawford County, MO, Dent County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 106 km from the middle of the area, began a volume at 20:45 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

Lincoln, IL (KILX), launched 12:00Z, 8.8 hours before the alert went out and 296 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, Lincoln, IL at 12:00Z on 2020-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 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, Lincoln, IL at 12:00Z on 2020-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -105 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
21 J/kg
Mixed-layer CIN
-291 J/kg
Mixed-layer LCL
1264 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
-105 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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
Apr 7, 7:22 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 18 more83 min
Apr 7, 11:20 PM CDTMesoscale DiscussionSPCChampaign, Christian, Coles, Douglas, Edgar, Macon and 3 more85 min
Apr 8, 1:46 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 43 more119 min
Apr 8, 3:08 PM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 58 more6 hr
Apr 8, 4:24 PM CDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more7 hr
Apr 8, 11:39 AM CDTMesoscale DiscussionSPCBath, Boyd, Bracken, Campbell, Carter, Elliott and 19 more96 min
Apr 8, 12:10 PM CDTSevere Thunderstorm WatchSPCBath, Bourbon, Boyd, Bracken, Carter, Elliott and 21 more7 hr
Apr 8, 3:05 PM CDTMesoscale DiscussionSPCBath, Breathitt, Elliott, Floyd, Johnson, Knott and 10 more85 min
Apr 8, 5:52 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Boone and 65 more2 hr
Apr 8, 6:24 PM CDTTornado WatchSPCAdair, Allen, Anderson, Barren, Boone, Bourbon and 55 more5 hr

Nearby

Mesoscale Discussions in Missouri, 2020Mesoscale Discussions in Illinois, 2020Mesoscale Discussions in Kentucky, 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.