Alert archive / Illinois / Mesoscale Discussions in 2015
Mesoscale Discussion 979
The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2015, 7:53 PM CDT for 22 counties in Illinois. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2015, 7:53 PM CDT (00:53 UTC)
- Expired
- Jun 11, 2015, 9:00 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
All 22 counties
Bureau County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL
The radar
The Lincoln radar (KILX), 91 km from the middle of the area, began a volume at 00:53 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
Davenport, (KDVN), launched 00:00Z, 0.9 hours before the alert went out and 105 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
- 77 J/kg
- Mixed-layer CIN
- -83 J/kg
- Mixed-layer LCL
- 1037 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 192 m²/s²
- 0-3 km storm-relative helicity
- 344 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| Jun 11, 8:13 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Fulton, Hancock, Henderson and 14 more | 92 min |
| Jun 11, 8:25 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Cass, Fulton, Hancock, Henderson and 7 more | 5 hr |
| Jun 11, 10:30 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Hancock, Henderson, McDonough and 2 more | 90 min |
Nearby
Mesoscale Discussions in Illinois, 2015Every mesoscale discussion in 2015
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.