Alert archive / Missouri / Mesoscale Discussions in 2023
Mesoscale Discussion 528
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2023, 3:21 PM CDT for 16 counties in Illinois; 17 counties in Missouri. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2023, 3:21 PM CDT (20:21 UTC)
- Expired
- Apr 15, 2023, 5:15 PM CDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch likely
- Chance of a watch
- 80%
All 33 counties
Alexander County, IL, Bond County, IL, Calhoun County, IL, Clinton County, IL, Greene County, IL, Jackson County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Union County, IL, Washington County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Perry County, MO, Pike County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO
The radar
The St Louis radar (KLSX), 64 km from the middle of the area, began a volume at 20:21 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, 8.4 hours before the alert went out and 255 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
- 40 J/kg
- Mixed-layer CIN
- -164 J/kg
- Mixed-layer LCL
- 1437 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, 8:50 AM CDT | Mesoscale Discussion | SPC | Alexander, Calhoun, Jackson, Jersey, Madison, Monroe and 3 more | 85 min |
| Apr 15, 11:39 AM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Macoupin, Madison, Monroe and 4 more | 3 hr |
| 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 |
| Apr 15, 12:48 PM CDT | Severe Thunderstorm Watch | SPC | Audrain, Barry, Barton, Benton, Boone, Callaway and 42 more | 6 hr |
| Apr 15, 3:38 PM CDT | Mesoscale Discussion | SPC | Barry, Camden, Christian, Cole, Crawford, Dallas and 21 more | 2 hr |
| Apr 15, 6:28 PM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 92 min |
| Apr 15, 6:48 PM CDT | Severe Thunderstorm Watch | SPC | Dunklin, Pemiscot | 7 hr |
Nearby
Mesoscale Discussions in Missouri, 2023Mesoscale Discussions in Illinois, 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.