Alert archive / Iowa / Mesoscale Discussions in 2004
Mesoscale Discussion 2118
The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2004, 2:29 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 26, 2004, 2:29 PM CDT (19:29 UTC)
- Expired
- Aug 26, 2004, 4:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 57 counties
Allamakee County, IA, Audubon 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, Chickasaw County, IA, Clayton County, IA, Crawford County, IA, Dallas County, IA, Delaware 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, Harrison County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Marshall County, IA, Mitchell County, IA, Monona County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Mower County, MN, Winona County, MN, Burt County, NE, Thurston County, NE, Washington County, NE, Crawford County, WI, Grant County, WI, La Crosse County, WI, Vernon County, WI
The radar
The Des Moines radar (KDMX), 89 km from the middle of the area, began a volume at 19:30 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
Omaha, NE (KOAX), launched 12:00Z, 7.5 hours before the alert went out and 257 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
- 67 J/kg
- Mixed-layer CIN
- -399 J/kg
- Mixed-layer LCL
- 1850 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 25, 9:57 PM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Des Moines, Henry, Jefferson, Lee and 2 more | 93 min |
| Aug 26, 4:10 PM CDT | Tornado Watch | SPC | Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 56 more | 6 hr |
| Aug 26, 3:47 PM CDT | Mesoscale Discussion | SPC | Cook, Itasca, Koochiching, Lake, Saint Louis | 118 min |
| Aug 26, 4:38 PM CDT | Mesoscale Discussion | SPC | Olmsted, Wabasha, Winona | 97 min |
| Aug 26, 4:39 PM CDT | Mesoscale Discussion | SPC | Big Stone, Grant, Pope, Stevens, Swift, Traverse | 2 hr |
Nearby
Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Minnesota, 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; radar from the NEXRAD Level II archive.