Alert archive / Indiana / Mesoscale Discussions in 2004
Mesoscale Discussion 2129
The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2004, 6:33 AM CDT for 4 states. It was in force for 27 min.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2004, 6:33 AM CDT (11:33 UTC)
- Expired
- Aug 27, 2004, 7:00 AM CDT
- In force
- 27 min
- Issued by
- the Storm Prediction Center
All 65 counties
Champaign County, IL, DeWitt County, IL, Ford County, IL, Iroquois County, IL, Mason County, IL, McLean County, IL, Peoria County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Allen County, IN, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Kosciusko County, IN, LaGrange County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Noble County, IN, Pulaski County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Arenac County, MI, Bay County, MI, Branch County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Oakland County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Paulding County, OH, Williams County, OH
The radar
The Northern Indiana radar (KIWX), 52 km from the middle of the area, began a volume at 11:34 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
Detroit, MI (KDTX), launched 00:00Z, 11.6 hours before the alert went out and 232 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
- 636 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 918 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
897 ACUS11 KWNS 271135 SWOMCD SPC MCD 271133 MIZ000-OHZ000-INZ000-ILZ000-271200- MESOSCALE DISCUSSION 2129 NWS STORM PREDICTION CENTER NORMAN OK 0633 AM CDT FRI AUG 27 2004 AREAS AFFECTED...NRN IL / NWRN IN / ERN LOWER MI CONCERNING...SEVERE THUNDERSTORM WATCH 790... VALID 271133Z - 271200Z STORMS HAVE WEAKENED AND CONTINUE TO MOVE OUT OF WW. WATCH WILL BE ALLOWED TO EXPIRE AS SCHEDULED AT 27/12Z. BROKEN LINE OF STORMS HAS WEAKENED OVER THE PAST HOUR...AND IS NOW MOVING E OF WW ACROSS ERN LOWER MI / NRN IN. DESPITE SUFFICIENT INSTABILITY AND FAVORABLE WIND FIELD...STORMS ARE LIKELY ELEVATED ABOVE STABLE BOUNDARY LAYER. THEREFORE...EXPECT ANY REMAINING SEVERE THREAT TO CONTINUE DIMINISHING THROUGH THE REMAINDER OF THE MORNING. ..GOSS.. 08/27/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CLE...DTX...APX...IWX...GRR...IND...LOT...ILX... 44078378 44068284 43078252 41418398 39918629 40098785 40169042 40898969 40688807 41118670 41888545
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 9:13 PM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Rock Island, Stephenson | 62 min |
| Aug 26, 9:45 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Carroll, Henderson, Henry, Jo Daviess, Mercer and 5 more | 6 hr |
| Aug 26, 11:53 PM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Grundy, Kane and 8 more | 97 min |
| Aug 27, 1:25 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DeWitt, DuPage and 25 more | 6 hr |
| Aug 27, 1:49 AM CDT | Mesoscale Discussion | SPC | Henderson, Henry, Mercer, Ogle, Rock Island, Whiteside and 1 more | 56 min |
| Aug 27, 4:36 AM CDT | Mesoscale Discussion | SPC | Cook, DeWitt, Ford, Fulton, Grundy, Hancock and 11 more | 84 min |
| Aug 27, 9:24 AM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Macoupin, Madison, Morgan and 2 more | 96 min |
| Aug 27, 9:40 AM CDT | Severe Thunderstorm Watch | SPC | Brown, Calhoun, Cass, Greene, Jersey, Macoupin and 7 more | 5 hr |
| Aug 27, 1:07 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Greene, Jersey and 6 more | 113 min |
| Aug 27, 2:45 PM CDT | Severe Thunderstorm Watch | SPC | Calhoun, Cass, Greene, Jersey, Morgan, Pike and 1 more | 6 hr |
| Aug 27, 3:49 PM CDT | Mesoscale Discussion | SPC | Calhoun, Cass, Greene, Jersey, Morgan, Pike and 1 more | 86 min |
| Aug 27, 4:10 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Fulton, Hancock, Henderson and 14 more | 2 hr |
| Aug 27, 12:10 PM CDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Carroll, Cass, DeKalb and 8 more | 3 hr |
| Aug 27, 1:39 AM CDT | Mesoscale Discussion | SPC | Antrim, Arenac, Benzie, Cheboygan, Clare, Crawford and 15 more | 66 min |
| Aug 27, 12:39 PM CDT | Mesoscale Discussion | SPC | Barry, Bay, Calhoun, Clinton, Eaton, Genesee and 23 more | 2 hr |
Nearby
Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Michigan, 2004Mesoscale Discussions in Illinois, 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.