Alert archive / Missouri / Mesoscale Discussions in 2017
Mesoscale Discussion 592
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2017, 12:50 PM CDT for Monroe County, Randolph County, Saint Clair County, Illinois; 25 counties in Missouri. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2017, 12:50 PM CDT (17:50 UTC)
- Expired
- Apr 29, 2017, 2:15 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 28 counties
Monroe County, IL, Randolph County, IL, Saint Clair 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, Perry County, MO, Phelps County, MO, Pulaski County, MO, Reynolds 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), 120 km from the middle of the area, began a volume at 17:52 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, 5.8 hours before the alert went out and 254 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 704 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 318 m²/s²
- 0-3 km storm-relative helicity
- 413 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
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 28, 10:01 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 7 more | 9 hr |
| Apr 28, 11:55 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 6 more | 95 min |
| Apr 29, 3:39 AM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 8 more | 96 min |
| Apr 29, 3:28 PM CDT | Mesoscale Discussion | SPC | Bond, Clay, Clinton, Crawford, Edwards, Effingham and 20 more | 2 hr |
| Apr 29, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Bond, Christian, Clark, Clay, Clinton and 38 more | 6 hr |
| Apr 29, 6:30 PM CDT | Mesoscale Discussion | SPC | Alexander, Clark, Clay, Coles, Crawford, Cumberland and 25 more | 60 min |
Nearby
Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Illinois, 2017Every mesoscale discussion in 2017
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.