Alert archive / Missouri / Mesoscale Discussions in 2019
Mesoscale Discussion 490
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2019, 10:13 PM CDT for 11 counties in Illinois; 27 counties in Missouri. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2019, 10:13 PM CDT (03:13 UTC)
- Expired
- Apr 30, 2019, 11:45 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 38 counties
Bond County, IL, Clinton County, IL, Fayette County, IL, Jackson County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Bollinger County, MO, Carter County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Maries County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Perry County, MO, Phelps County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Texas County, MO, Washington County, MO, Wayne County, MO
The radar
The St Louis radar (KLSX), 112 km from the middle of the area, began a volume at 03:13 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
Springfield, MO (KSGF), launched 00:00Z, 3.2 hours before the alert went out and 288 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
- 390 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 893 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 158 m²/s²
- 0-3 km storm-relative helicity
- 312 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 4.0
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 30, 7:29 PM CDT | Mesoscale Discussion | SPC | Monroe, Randolph, Saint Clair | 61 min |
| Apr 30, 8:03 PM CDT | Tornado Watch | SPC | Bond, Clinton, Fayette, Jackson, Jefferson, Madison and 6 more | 5 hr |
Nearby
Mesoscale Discussions in Missouri, 2019Mesoscale Discussions in Illinois, 2019Every mesoscale discussion in 2019
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.