Alert archive / Iowa / Mesoscale Discussions in 2004
Mesoscale Discussion 1855
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 1:16 PM CDT for 52 counties in Iowa; 6 counties in Minnesota; Dakota County, Dixon County, Nebraska. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2004, 1:16 PM CDT (18:16 UTC)
- Expired
- Aug 3, 2004, 2:45 PM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
All 60 counties
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, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Iowa County, IA, Jasper County, IA, Kossuth County, IA, Linn County, IA, Marshall County, IA, Mitchell County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Nobles County, MN, Dakota County, NE, Dixon County, NE
The radar
The Des Moines radar (KDMX), 128 km from the middle of the area, began a volume at 18:19 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
Minneapolis, MN (KMPX), launched 12:00Z, 6.3 hours before the alert went out and 233 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
- 485 J/kg
- Mixed-layer CIN
- -116 J/kg
- Mixed-layer LCL
- 957 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 35 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 |
|---|---|---|---|---|
| Aug 3, 2:02 AM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Buena Vista, Butler, Calhoun and 30 more | 118 min |
| Aug 3, 7:21 AM CDT | Mesoscale Discussion | SPC | Lyon | 54 min |
| Aug 3, 10:48 AM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Buena Vista, Butler and 32 more | 87 min |
| Aug 3, 11:05 AM CDT | Severe Thunderstorm Watch | SPC | Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo, Cherokee and 25 more | 6 hr |
| Aug 3, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more | 5 hr |
| Aug 3, 3:00 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Carroll, Cass, Crawford, Greene and 8 more | 2 hr |
| Aug 3, 3:55 PM CDT | Mesoscale Discussion | SPC | Adair, Appanoose, Benton, Black Hawk, Boone, Buchanan and 43 more | 95 min |
| Aug 3, 4:25 PM CDT | Tornado Watch | SPC | Appanoose, Benton, Black Hawk, Boone, Buchanan, Cedar and 39 more | 6 hr |
| Aug 3, 4:52 PM CDT | Mesoscale Discussion | SPC | Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more | 53 min |
| Aug 3, 5:00 PM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more | 5 hr |
| Aug 3, 5:07 PM CDT | Mesoscale Discussion | SPC | Allamakee, Clayton, Fayette, Winneshiek | 53 min |
| Aug 3, 5:39 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 32 more | 66 min |
| Aug 3, 6:34 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 28 more | 86 min |
| Aug 3, 6:45 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more | 90 min |
| Aug 2, 7:47 PM CDT | Mesoscale Discussion | SPC | Antelope, Blaine, Boone, Boyd, Brown, Cedar and 15 more | 58 min |
Nearby
Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Minnesota, 2004Mesoscale Discussions in Nebraska, 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.