Alert archive / Missouri / Mesoscale Discussions in 2023
Mesoscale Discussion 522
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2023, 8:50 AM CDT for Clay County, Greene County, Randolph County, Arkansas; 9 counties in Illinois; 39 counties in Missouri. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2023, 8:50 AM CDT (13:50 UTC)
- Expired
- Apr 15, 2023, 10:15 AM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 5%
All 51 counties
Clay County, AR, Greene County, AR, Randolph County, AR, Alexander County, IL, Calhoun County, IL, Jackson County, IL, Jersey County, IL, Madison County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Union County, IL, Audrain County, MO, Bollinger County, MO, Butler County, MO, Callaway County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Dunklin County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Montgomery County, MO, New Madrid County, MO, Oregon County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Wayne County, MO
The radar
The St Louis radar (KLSX), 95 km from the middle of the area, began a volume at 13:52 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
Springfield, MO (KSGF), launched 12:00Z, 1.8 hours before the alert went out and 256 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.
- Mixed-layer CAPE
- 382 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 1195 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 11:39 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more | 3 hr |
| Apr 15, 12:48 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Conway, Crawford and 20 more | 6 hr |
| Apr 15, 1:45 PM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 21 more | 2 hr |
| Apr 15, 3:38 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Crawford, Franklin, Fulton and 13 more | 2 hr |
| Apr 15, 4:13 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 31 more | 6 hr |
| Apr 15, 6:04 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Clark, Cleburne and 34 more | 56 min |
| Apr 15, 6:28 PM CDT | Mesoscale Discussion | SPC | Craighead, Crittenden, Cross, Greene, Lee, Mississippi and 3 more | 92 min |
| Apr 15, 6:48 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot, Clay, Craighead, Crittenden, Cross and 6 more | 7 hr |
| Apr 15, 3:21 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Calhoun, Clinton, Greene, Jackson and 10 more | 114 min |
| Apr 15, 4:03 PM CDT | Tornado Watch | SPC | Alexander, Bond, Calhoun, Clinton, Fayette, Franklin and 15 more | 6 hr |
| Apr 15, 5:07 PM CDT | Mesoscale Discussion | SPC | Calhoun, Jersey, Madison, Monroe, Saint Clair | 83 min |
| Apr 15, 6:50 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Clay, Clinton, Effingham, Fayette and 20 more | 85 min |
| Apr 14, 9:04 PM CDT | Mesoscale Discussion | SPC | Atchison | 86 min |
| Apr 14, 11:33 PM CDT | Mesoscale Discussion | SPC | Buchanan, Platte | 117 min |
Nearby
Mesoscale Discussions in Missouri, 2023Mesoscale Discussions in Illinois, 2023Mesoscale Discussions in Arkansas, 2023Every mesoscale discussion in 2023
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.