Alert archive / Illinois / Mesoscale Discussions in 2024
Mesoscale Discussion 166
The Storm Prediction Center issued this mesoscale discussion at Feb 27, 2024, 5:59 PM CST for 23 counties in Illinois; Lake County, Porter County, Indiana. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Feb 27, 2024, 5:59 PM CST (23:59 UTC)
- Expired
- Feb 27, 2024, 7:30 PM CST
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 25
All 25 counties
Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McHenry County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Whiteside County, IL, Will County, IL, Lake County, IN, Porter County, IN
The radar
The Chicago radar (KLOT), 71 km from the middle of the area, began a volume at 00:03 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
Davenport, (KDVN), launched 12:00Z, 12.0 hours before the alert went out and 132 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
- 2996 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 149 m²/s²
- 0-3 km storm-relative helicity
- 197 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 |
|---|---|---|---|---|
| Feb 27, 12:00 AM CST | Mesoscale Discussion | SPC | Franklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson and 10 more | 2 hr |
| Feb 27, 2:50 PM CST | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 25 more | 115 min |
| Feb 27, 3:53 PM CST | Tornado Watch | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 20 more | 6 hr |
| Feb 27, 5:47 PM CST | Mesoscale Discussion | SPC | Bond, Christian, Clark, Clay, Clinton, Coles and 20 more | 88 min |
Nearby
Mesoscale Discussions in Illinois, 2024Mesoscale Discussions in Indiana, 2024Every mesoscale discussion in 2024
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.