Alert archive / Illinois / Mesoscale Discussions in 2012
Mesoscale Discussion 2063
The Storm Prediction Center issued this mesoscale discussion at Oct 17, 2012, 11:45 AM CDT for 43 counties in Illinois; 13 counties in Missouri. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Oct 17, 2012, 11:45 AM CDT (16:45 UTC)
- Expired
- Oct 17, 2012, 1:15 PM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
All 56 counties
Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Jasper County, IL, Jersey County, IL, Knox County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Audrain County, MO, City of Saint Louis, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO
The radar
The Lincoln radar (KILX), 64 km from the middle of the area, began a volume at 16:46 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, 4.8 hours before the alert went out and 106 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
- 1209 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 158 m²/s²
- 0-3 km storm-relative helicity
- 269 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 17, 1:58 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 6 hr |
| Oct 17, 5:21 PM CDT | Tornado Watch | SPC | Alexander, Franklin, Jackson, Johnson, Massac, Perry and 3 more | 7 hr |
| Oct 17, 6:19 PM CDT | Mesoscale Discussion | SPC | Bond, Christian, Clay, Clinton, Effingham, Fayette and 12 more | 56 min |
| Oct 17, 12:55 PM CDT | Mesoscale Discussion | SPC | Barry, Camden, Cedar, Christian, Cole, Crawford and 29 more | 95 min |
| Oct 17, 3:44 PM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 61 min |
Nearby
Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Missouri, 2012Every mesoscale discussion in 2012
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.