Alert archive / Illinois / Mesoscale Discussions in 2018
Mesoscale Discussion 330
The Storm Prediction Center issued this mesoscale discussion at May 3, 2018, 1:57 AM CDT for 28 counties in Illinois; 7 counties in Indiana. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- May 3, 2018, 1:57 AM CDT (06:57 UTC)
- Expired
- May 3, 2018, 3:30 AM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 35 counties
Bureau County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee 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, McLean County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Tippecanoe County, IN, Warren County, IN
The radar
The Chicago radar (KLOT), 87 km from the middle of the area, began a volume at 06:58 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
Lincoln, IL (KILX), launched 00:00Z, 7.0 hours before the alert went out and 122 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
- 1056 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1699 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.7
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 |
|---|---|---|---|---|
| May 2, 7:21 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 24 more | 84 min |
| May 2, 10:01 PM CDT | Mesoscale Discussion | SPC | Bureau, DeKalb, DuPage, Grundy, Henderson, Henry and 18 more | 89 min |
| May 2, 10:20 PM CDT | Mesoscale Discussion | SPC | Adams, Calhoun, Pike | 115 min |
| May 2, 10:51 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Cook, DeKalb, DuPage, Ford, Fulton and 23 more | 4 hr |
| May 2, 11:09 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 5 more | 7 hr |
| May 3, 2:32 AM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Macoupin, Madison, Monroe and 3 more | 88 min |
Nearby
Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Indiana, 2018Every mesoscale discussion in 2018
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.