Alert archive / Indiana / Mesoscale Discussions in 2012
Mesoscale Discussion 1917
The Storm Prediction Center issued this mesoscale discussion at Sep 7, 2012, 3:22 PM CDT for 4 states. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Sep 7, 2012, 3:22 PM CDT (20:22 UTC)
- Expired
- Sep 7, 2012, 4:15 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 70 counties
Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Ford County, IL, Fulton County, IL, Jasper County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Sangamon County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Dearborn County, IN, Decatur County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jennings County, IN, Johnson County, IN, Marion County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Ohio County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Wayne County, IN, Boone County, KY, Campbell County, KY, Kenton County, KY, Butler County, OH, Clermont County, OH, Hamilton County, OH, Preble County, OH, Warren County, OH
The radar
The Indianapolis radar (KIND), 118 km from the middle of the area, began a volume at 20:22 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, 8.4 hours before the alert went out and 87 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
- 367 J/kg
- Mixed-layer CIN
- -412 J/kg
- Mixed-layer LCL
- 1436 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
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 7, 10:09 AM CDT | Mesoscale Discussion | SPC | Clark, Coles, Crawford, Cumberland, Douglas, Edgar and 5 more | 2 hr |
| Sep 7, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 6 hr |
| Sep 7, 3:41 PM CDT | Severe Thunderstorm Watch | SPC | Christian, Clark, Clay, Coles, Crawford, Cumberland and 8 more | 6 hr |
| Sep 7, 3:44 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 8 more | 2 hr |
| Sep 7, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 hr |
| Sep 7, 6:06 PM CDT | Mesoscale Discussion | SPC | Bond, Clinton, Madison, Monroe, Randolph, Saint Clair and 1 more | 84 min |
| Sep 7, 10:36 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 38 more | 6 hr |
| Sep 7, 12:16 PM CDT | Mesoscale Discussion | SPC | Adams, Delaware, Fayette, Hancock, Henry, Jay and 4 more | 59 min |
| Sep 7, 1:16 PM CDT | Mesoscale Discussion | SPC | Fayette, Henry, Randolph, Rush, Union, Wayne | 59 min |
| Sep 7, 2:39 PM CDT | Mesoscale Discussion | SPC | Dearborn, Franklin, Union | 66 min |
| Sep 7, 2:22 PM CDT | Severe Thunderstorm Watch | SPC | Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Crawford and 18 more | 4 hr |
| Sep 7, 5:38 PM CDT | Mesoscale Discussion | SPC | Athens, Belmont, Carroll, Columbiana, Guernsey, Harrison and 15 more | 97 min |
Nearby
Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Ohio, 2012Every mesoscale discussion in 2012
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.