Alert archive / Illinois / Mesoscale Discussions in 2017
Mesoscale Discussion 220
The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2017, 5:24 PM CST for 4 states. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2017, 5:24 PM CST (23:24 UTC)
- Expired
- Feb 28, 2017, 7:00 PM CST
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 62 counties
Cedar County, IA, Clinton County, IA, Des Moines County, IA, Henry County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Fulton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, White County, IN, Berrien County, MI
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, 11.4 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 569 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 276 m²/s²
- 0-3 km storm-relative helicity
- 285 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 28, 1:46 PM CST | Mesoscale Discussion | SPC | Alexander, Franklin, Jackson, Jefferson, Johnson, Massac and 8 more | 2 hr |
| Feb 28, 2:03 PM CST | Mesoscale Discussion | SPC | Bureau, DeKalb, DuPage, Ford, Fulton, Grundy and 24 more | 2 hr |
| Feb 28, 2:19 PM CST | Tornado Watch | SPC | Alexander, Bond, Calhoun, Clinton, Edwards, Fayette and 27 more | 7 hr |
| Feb 28, 2:57 PM CST | Tornado Watch | SPC | Adams, Boone, Brown, Bureau, Carroll, Cass and 63 more | 7 hr |
| Feb 28, 5:28 PM CST | Mesoscale Discussion | SPC | Alexander, Jackson, Johnson, Massac, Pope, Pulaski and 2 more | 2 hr |
Nearby
Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Indiana, 2017Mesoscale Discussions in Iowa, 2017Every mesoscale discussion in 2017
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.