Alert archive / Iowa / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 520
The Storm Prediction Center issued this severe thunderstorm watch at Jul 7, 2001, 8:30 AM CDT for 43 counties in Iowa. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 7, 2001, 8:30 AM CDT (13:30 UTC)
- Expired
- Jul 7, 2001, 1:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 43 counties
Black Hawk County, IA, Boone County, IA, Bremer 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, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon 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, 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
The radar
The Des Moines radar (KDMX), 143 km from the middle of the area, began a volume at 13:34 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
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 8:51 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 24 min |
| Jul 7, 9:15 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth, Woodbury | 30 min |
| Jul 7, 9:15 AM CDT | Severe Thunderstorm Warning | FSD | Ida | 30 min |
| Jul 7, 9:45 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida | 30 min |
| Jul 7, 9:49 AM CDT | Severe Thunderstorm Warning | DMX | Sac | 31 min |
| Jul 7, 10:16 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Sac | 39 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 1.5 hours before the alert went out and 217 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
- 173 J/kg
- Mixed-layer CIN
- -708 J/kg
- Mixed-layer LCL
- 2159 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -113 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
Nearby
Severe Thunderstorm Watches in Iowa, 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.