Alert archive / Indiana / Mesoscale Discussions in 2011
Mesoscale Discussion 1837
The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2011, 11:25 PM CDT for 4 states. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Aug 2, 2011, 11:25 PM CDT (04:25 UTC)
- Expired
- Aug 3, 2011, 1:00 AM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 29 counties
Iroquois County, IL, Allen County, IN, Benton County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, White County, IN, Whitley County, IN, Branch County, MI, Calhoun County, MI, Cass County, MI, Kalamazoo County, MI, Saint Joseph County, MI, Williams County, OH
The radar
The Northern Indiana radar (KIWX), 63 km from the middle of the area, began a volume at 04:25 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 00:00Z, 4.4 hours before the alert went out and 218 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
- 3189 J/kg
- Mixed-layer CIN
- -176 J/kg
- Mixed-layer LCL
- 1419 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 239 m²/s²
- 0-3 km storm-relative helicity
- 306 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 6.2
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 2, 8:34 PM CDT | Mesoscale Discussion | SPC | Cook, DeKalb, DuPage, Grundy, Kane, Kankakee and 4 more | 86 min |
| Aug 3, 12:26 PM CDT | Mesoscale Discussion | SPC | Pope | 64 min |
| Aug 3, 12:48 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Carroll, Clinton, Dearborn, Delaware, Fountain and 14 more | 8 hr |
| Aug 3, 3:28 AM CDT | Mesoscale Discussion | SPC | Adams, Athens, Brown, Butler, Champaign, Clark and 44 more | 92 min |
| Aug 3, 7:21 AM CDT | Mesoscale Discussion | SPC | Adams, Athens, Brown, Butler, Champaign, Clark and 44 more | 84 min |
Nearby
Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Michigan, 2011Mesoscale Discussions in Illinois, 2011Every mesoscale discussion in 2011
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.