Alert archive / Wisconsin / Mesoscale Discussions in 2004
Mesoscale Discussion 668
The Storm Prediction Center issued this mesoscale discussion at May 12, 2004, 11:29 AM CDT for 18 counties in Iowa; 12 counties in Minnesota; 20 counties in Wisconsin. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 12, 2004, 11:29 AM CDT (16:29 UTC)
- Expired
- May 12, 2004, 1:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 50 counties
Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Worth County, IA, Dakota County, MN, Dodge County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Crawford County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Washburn County, WI
The radar
The La Crosse radar (KARX), 79 km from the middle of the area, began a volume at 16:30 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
Minneapolis, MN (KMPX), launched 12:00Z, 4.5 hours before the alert went out and 147 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
- 503 J/kg
- Mixed-layer CIN
- -149 J/kg
- Mixed-layer LCL
- 858 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 295 m²/s²
- 0-3 km storm-relative helicity
- 278 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
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 |
|---|---|---|---|---|
| May 12, 12:20 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Cerro Gordo, Chickasaw, Clayton, Fayette, Floyd and 5 more | 6 hr |
| May 12, 2:22 PM CDT | Mesoscale Discussion | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 8 more | 83 min |
| May 12, 3:37 PM CDT | Mesoscale Discussion | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 10 more | 83 min |
| May 12, 5:22 PM CDT | Mesoscale Discussion | SPC | Allamakee, Clayton, Fayette | 53 min |
| May 11, 7:00 PM CDT | Tornado Watch | SPC | Becker, Beltrami, Clay, Clearwater, Hubbard, Mahnomen and 4 more | 6 hr |
| May 11, 7:22 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Cass, Clearwater, Hubbard, Mahnomen | 113 min |
| May 11, 8:45 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Beltrami, Big Stone, Cass, Clay, Clearwater and 15 more | 5 hr |
| May 11, 10:08 PM CDT | Mesoscale Discussion | SPC | Big Stone, Grant, Lac qui Parle, Lincoln, Lyon, Otter Tail and 6 more | 2 hr |
Nearby
Mesoscale Discussions in Wisconsin, 2004Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Minnesota, 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.