Alert archive / Illinois / Mesoscale Discussions in 2014
Mesoscale Discussion 1738
The Storm Prediction Center issued this mesoscale discussion at Sep 20, 2014, 1:25 PM CDT for 39 counties in Illinois; 16 counties in Indiana; Berrien County, Michigan. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Sep 20, 2014, 1:25 PM CDT (18:25 UTC)
- Expired
- Sep 20, 2014, 3:00 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 56 counties
Boone County, IL, Bureau County, IL, Cass County, IL, Cook County, IL, DeKalb County, IL, DeWitt 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, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Cass County, IN, Elkhart County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami 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 radar
The Chicago radar (KLOT), 57 km from the middle of the area, began a volume at 18:29 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 12:00Z, 6.4 hours before the alert went out and 128 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
- 46 J/kg
- Mixed-layer CIN
- -295 J/kg
- Mixed-layer LCL
- 792 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Sep 20, 2:12 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Cass, DeWitt, Ford, Fulton, Grundy and 24 more | 5 hr |
| Sep 20, 4:22 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Coles, Cumberland, Douglas and 12 more | 113 min |
| Sep 20, 5:19 PM CDT | Mesoscale Discussion | SPC | Ford, Iroquois | 56 min |
| Sep 20, 6:56 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Cass, DeWitt, Fulton and 26 more | 2 hr |
| Sep 20, 5:00 PM CDT | Mesoscale Discussion | SPC | Genesee, Ingham, Lapeer, Livingston, Oakland, Saint Clair and 3 more | 2 hr |
| Sep 20, 5:19 PM CDT | Severe Thunderstorm Watch | SPC | Genesee, Huron, Lapeer, Lenawee, Livingston, Macomb and 8 more | 4 hr |
Nearby
Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Indiana, 2014Mesoscale Discussions in Michigan, 2014Every mesoscale discussion in 2014
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.