Alert archive / Iowa / Mesoscale Discussions in 2004
Mesoscale Discussion 808
The Storm Prediction Center issued this mesoscale discussion at May 21, 2004, 7:37 PM CDT for 25 counties in Illinois; 54 counties in Iowa; Lafayette County, Wisconsin. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- May 21, 2004, 7:37 PM CDT (00:37 UTC)
- Expired
- May 21, 2004, 9:00 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 80 counties
Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cedar County, IA, Cherokee County, IA, Clay County, IA, Clayton County, IA, Clinton County, IA, Crawford County, IA, Dallas County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Ida County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Muscatine County, IA, O'Brien County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Scott County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Washington County, IA, Webster County, IA, Wright County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Lafayette County, WI
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.6 hours before the alert went out and 346 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
- 2 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 512 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 215 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 |
|---|---|---|---|---|
| May 22, 12:05 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 22 more | 6 hr |
| May 22, 2:41 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 23 more | 94 min |
| May 22, 6:58 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Fulton, Hancock, Henderson and 13 more | 62 min |
| May 22, 11:03 AM CDT | Mesoscale Discussion | SPC | DeWitt, Ford, Grundy, Iroquois, Kankakee, LaSalle and 9 more | 57 min |
| May 22, 11:35 AM CDT | Severe Thunderstorm Watch | SPC | Champaign, Cook, DeWitt, Douglas, Ford, Grundy and 10 more | 6 hr |
| May 22, 5:52 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, Grundy, Henry, Jo Daviess and 12 more | 113 min |
| May 22, 6:15 PM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 25 more | 6 hr |
| May 21, 9:55 PM CDT | Tornado Watch | SPC | Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 14 more | 4 hr |
| May 22, 12:25 AM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 14 more | 2 hr |
| May 22, 12:55 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 17 more | 5 hr |
| May 22, 3:44 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Cass, Dallas and 11 more | 61 min |
| May 22, 3:02 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 29 more | 58 min |
| May 22, 3:45 PM CDT | Tornado Watch | SPC | Fremont, Harrison, Mills, Pottawattamie, Shelby | 7 hr |
Nearby
Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Wisconsin, 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.