Alert archive / Iowa / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 176
The Storm Prediction Center issued this severe thunderstorm watch at Apr 22, 2001, 9:00 PM CDT for 37 counties in Iowa; Atchison County, Holt County, Nodaway County, Missouri; 11 counties in Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2001, 9:00 PM CDT (02:00 UTC)
- Expired
- Apr 23, 2001, 3:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 51 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Palo Alto County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Taylor County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Atchison County, MO, Holt County, MO, Nodaway County, MO, Cass County, NE, Douglas County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Sarpy County, NE, Washington County, NE
The radar
The Omaha radar (KOAX), 85 km from the middle of the area, began a volume at 02:03 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
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 9:48 PM CDT | Severe Thunderstorm Warning | OAX | Burt, Washington | 27 min |
| Apr 22, 9:57 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 33 min |
| Apr 22, 10:14 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 31 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 2.0 hours before the alert went out and 85 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
- 965 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 627 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 259 m²/s²
- 0-3 km storm-relative helicity
- 242 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 5.4
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 |
|---|---|---|---|---|
| Apr 22, 7:00 PM CDT | Tornado Watch | SPC | Barry, Lawrence, McDonald, Newton | 6 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2001Severe Thunderstorm Watches in Nebraska, 2001Severe Thunderstorm Watches in Missouri, 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.