Alert archive / Iowa / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 725
The Storm Prediction Center issued this severe thunderstorm watch at Sep 7, 2001, 11:00 PM CDT for 16 counties in Illinois; 25 counties in Iowa; 16 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 7, 2001, 11:00 PM CDT (04:00 UTC)
- Expired
- Sep 8, 2001, 3:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 57 counties
Allamakee County, IA, Benton County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Lee County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Marquette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI
The radar
The Quad Cities radar (KDVN), 46 km from the middle of the area, began a volume at 04:01 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
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 11:03 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 57 min |
| Sep 7, 11:19 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 26 min |
| Sep 7, 11:20 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson | 40 min |
| Sep 7, 11:27 PM CDT | Severe Thunderstorm Warning | DVN | Delaware | 63 min |
| Sep 7, 11:49 PM CDT | Severe Thunderstorm Warning | ARX | Crawford | 41 min |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 4.0 hours before the alert went out and 50 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
- 1494 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1251 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.5
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 |
|---|---|---|---|---|
| Sep 7, 8:45 PM CDT | Severe Thunderstorm Watch | SPC | Henderson, Henry, Mercer, Rock Island, Warren | 4 hr |
| Sep 7, 8:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Fulton, Hancock, McDonough, Pike and 1 more | 5 hr |
| Sep 7, 7:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calumet, Door, Florence, Fond du Lac and 16 more | 3 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2001Severe Thunderstorm Watches in Illinois, 2001Severe Thunderstorm Watches in Wisconsin, 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.