Alert archive / Iowa / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 401
The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2001, 8:00 PM CDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2001, 8:00 PM CDT (01:00 UTC)
- Expired
- Jun 12, 2001, 2:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 81 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, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Clayton County, IA, Crawford County, IA, Dallas 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, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Story 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, Olmsted County, MN, Winona County, MN, Boone County, NE, Burt County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Hamilton County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, York County, NE, Trempealeau County, WI
The radar
The Omaha radar (KOAX), 138 km from the middle of the area, began a volume at 01:03 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.
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 8:14 PM CDT | Severe Thunderstorm Warning | ARX | Winona | 61 min |
| Jun 11, 8:45 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien | 30 min |
| Jun 11, 8:45 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Trempealeau | 75 min |
| Jun 11, 9:04 PM CDT | Severe Thunderstorm Warning | ARX | Houston | 56 min |
| Jun 11, 9:07 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 38 min |
| Jun 11, 9:44 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 31 min |
| Jun 11, 10:05 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 25 min |
| Jun 11, 10:06 PM CDT | Severe Thunderstorm Warning | DMX | Pocahontas | 44 min |
| Jun 11, 10:13 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 17 min |
| Jun 11, 10:30 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 30 min |
| Jun 11, 10:45 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 30 min |
| Jun 11, 10:54 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto | 51 min |
| Jun 11, 11:15 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 30 min |
| Jun 11, 11:45 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto | 45 min |
| Jun 12, 1:27 AM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 48 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 1.0 hours before the alert went out and 139 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
- 3594 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 2097 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 11:30 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Audubon, Boone, Calhoun, Carroll, Cass and 22 more | 5 hr |
| Jun 12, 6:00 PM CDT | Tornado Watch | SPC | Buena Vista, Carroll, Cherokee, Clay, Crawford, Dickinson and 12 more | 6 hr |
| Jun 12, 1:45 AM CDT | Severe Thunderstorm Watch | SPC | Arthur, Buffalo, Custer, Dawson, Greeley, Hall and 8 more | 5 hr |
| Jun 12, 1:45 AM CDT | Severe Thunderstorm Watch | SPC | Arthur, Buffalo, Custer, Dawson, Greeley, Hall and 8 more | 5 hr |
| Jun 12, 3:00 PM CDT | Tornado Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 6 hr |
| Jun 11, 7:00 PM CDT | Tornado Watch | SPC | Adams, Columbia, Crawford, Dane, Dodge, Fond du Lac and 17 more | 5 hr |
| Jun 11, 9:15 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Calumet, Kewaunee, Manitowoc, Milwaukee, Ozaukee and 4 more | 3 hr |
| Jun 11, 10:30 PM CDT | Severe Thunderstorm Watch | SPC | Kenosha, Racine, Walworth | 5 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2001Severe Thunderstorm Watches in Nebraska, 2001Severe Thunderstorm Watches in Minnesota, 2001Every severe thunderstorm watch in 2001
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.