Alert archive / Indiana / Mesoscale Discussions in 2004
Mesoscale Discussion 1874
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 11:47 PM EST for 15 counties in Indiana; Cass County, Saint Joseph County, Michigan. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2004, 11:47 PM EST (04:47 UTC)
- Expired
- Aug 4, 2004, 12:45 AM EST
- In force
- 58 min
- Issued by
- the Storm Prediction Center
Counties Benton County, IN, Carroll County, IN, Cass County, IN, Elkhart County, IN, Fulton County, IN, Kosciusko County, IN, LaGrange County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Pulaski County, IN, Saint Joseph County, IN, Wabash County, IN, White County, IN, Whitley County, IN, Cass County, MI, Saint Joseph County, MI
The radar
The Northern Indiana radar (KIWX), 58 km from the middle of the area, began a volume at 04:48 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 nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 4.8 hours before the alert went out and 227 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
- 4276 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 860 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 11.6
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 3, 7:38 PM EST | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Cass, Clinton, Fountain and 22 more | 67 min |
| Aug 3, 7:55 PM EST | Severe Thunderstorm Watch | SPC | Jasper, Lake, Newton, Porter | 5 hr |
| Aug 3, 10:35 PM EST | Severe Thunderstorm Watch | SPC | Adams, Allen, Benton, Blackford, Carroll, Cass and 26 more | 5 hr |
| Aug 4, 1:15 AM EST | Mesoscale Discussion | SPC | Adams, Allen, Benton, Blackford, Carroll, Cass and 26 more | 90 min |
| Aug 4, 5:44 AM EST | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Boone, Carroll, Clay and 28 more | 2 hr |
| Aug 4, 1:01 PM EST | Mesoscale Discussion | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 7 more | 89 min |
| Aug 4, 1:30 PM EST | Severe Thunderstorm Watch | SPC | Clark, Crawford, Floyd, Harrison, Perry | 6 hr |
| Aug 4, 3:39 PM EST | Mesoscale Discussion | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Perry and 3 more | 96 min |
Nearby
Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Michigan, 2004Every mesoscale discussion in 2004
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.