Alert archive / Indiana / Mesoscale Discussions in 2012
Mesoscale Discussion 1775
The Storm Prediction Center issued this mesoscale discussion at Aug 16, 2012, 3:07 PM CDT for 14 counties in Illinois; 21 counties in Indiana. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Aug 16, 2012, 3:07 PM CDT (20:07 UTC)
- Expired
- Aug 16, 2012, 4:30 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 35 counties
Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Lawrence County, IL, Moultrie County, IL, Richland County, IL, Shelby County, IL, Wabash County, IL, Brown County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Jackson County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Orange County, IN, Owen County, IN, Pike County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN
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, 8.1 hours before the alert went out and 154 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
- 817 J/kg
- Mixed-layer CIN
- -262 J/kg
- Mixed-layer LCL
- 1559 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
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 |
|---|---|---|---|---|
| Aug 16, 3:57 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 19 more | 3 hr |
| Aug 16, 10:01 AM CDT | Mesoscale Discussion | SPC | Clark, Coles, Crawford, Cumberland, Douglas, Edgar and 4 more | 89 min |
| Aug 16, 12:47 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Champaign, Christian, Clark, Clay and 40 more | 88 min |
| Aug 16, 1:05 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 36 more | 7 hr |
| Aug 16, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Clark, Crawford, Edwards, Franklin, Gallatin and 14 more | 8 hr |
| Aug 16, 5:25 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Clark, Clay, Clinton, Crawford and 27 more | 2 hr |
Nearby
Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Illinois, 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.