Alert archive / Illinois / Mesoscale Discussions in 2020
Mesoscale Discussion 261
The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2020, 8:06 PM CDT for 23 counties in Illinois. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Mar 28, 2020, 8:06 PM CDT (01:06 UTC)
- Expired
- Mar 28, 2020, 9:00 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 23 counties
Bureau County, IL, Carroll County, IL, Cass County, IL, DeKalb County, IL, DeWitt County, IL, Grundy County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Whiteside County, IL, Woodford County, IL
The radar
The Lincoln radar (KILX), 76 km from the middle of the area, began a volume at 01:07 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 00:00Z, 1.1 hours before the alert went out and 108 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
- 730 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 861 m above ground
- 0-6 km bulk shear
- 81 kt
- 0-1 km storm-relative helicity
- 445 m²/s²
- 0-3 km storm-relative helicity
- 445 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 15.8
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 |
|---|---|---|---|---|
| Mar 28, 8:41 PM CDT | Tornado Watch | SPC | Bureau, Cass, Champaign, Christian, DeKalb, DeWitt and 27 more | 3 hr |
| Mar 28, 10:23 PM CDT | Mesoscale Discussion | SPC | DeKalb, Ford, Grundy, Kendall, LaSalle, Livingston and 1 more | 97 min |
Nearby
Mesoscale Discussions in Illinois, 2020Every mesoscale discussion in 2020
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.