Alert archive / Iowa / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 218
The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2001, 9:00 PM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 9, 2001, 9:00 PM CDT (02:00 UTC)
- Expired
- May 10, 2001, 2:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 89 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Harrison County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Cloud County, KS, Graham County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Trego County, KS, Washington County, KS, Atchison County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Adams County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE
The radar
The Omaha radar (KOAX), 87 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
33 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 9:00 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 45 min |
| May 9, 9:11 PM CDT | Severe Thunderstorm Warning | GID | Hamilton, Merrick | 49 min |
| May 9, 9:17 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 58 min |
| May 9, 9:18 PM CDT | Severe Thunderstorm Warning | GLD | Norton | 57 min |
| May 9, 9:18 PM CDT | Severe Thunderstorm Warning | GID | Franklin | 42 min |
| May 9, 9:22 PM CDT | Severe Thunderstorm Warning | GID | Adams | 53 min |
| May 9, 9:26 PM CDT | Severe Thunderstorm Warning | OAX | Washington | 34 min |
| May 9, 9:29 PM CDT | Severe Thunderstorm Warning | GID | Polk, York | 46 min |
| May 9, 9:39 PM CDT | Severe Thunderstorm Warning | GID | Hall | 36 min |
| May 9, 9:51 PM CDT | Severe Thunderstorm Warning | OAX | Mills | 54 min |
| May 9, 9:51 PM CDT | Severe Thunderstorm Warning | GID | Webster | 39 min |
| May 9, 9:59 PM CDT | Severe Thunderstorm Warning | GID | Clay, Nuckolls | 46 min |
| May 9, 10:06 PM CDT | Severe Thunderstorm Warning | GID | Fillmore, York | 54 min |
| May 9, 10:13 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 32 min |
| May 9, 10:13 PM CDT | Severe Thunderstorm Warning | OAX | Dodge, Washington | 62 min |
| May 9, 10:20 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Tama | 30 min |
| May 9, 10:24 PM CDT | Severe Thunderstorm Warning | GID | Jewell | 51 min |
| May 9, 10:25 PM CDT | Severe Thunderstorm Warning | GID | Thayer | 65 min |
| May 9, 10:29 PM CDT | Severe Thunderstorm Warning | TOP | Republic | 56 min |
| May 9, 10:30 PM CDT | Severe Thunderstorm Warning | GID | Smith | 45 min |
| May 9, 10:41 PM CDT | Severe Thunderstorm Warning | DMX | Cass | 29 min |
| May 9, 10:44 PM CDT | Severe Thunderstorm Warning | GID | Nuckolls | 31 min |
| May 9, 10:45 PM CDT | Severe Thunderstorm Warning | OAX | Douglas | 45 min |
| May 9, 10:48 PM CDT | Severe Thunderstorm Warning | OAX | Saline, Seward | 42 min |
| May 9, 10:51 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 29 min |
| May 9, 11:14 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery | 46 min |
| May 9, 11:14 PM CDT | Severe Thunderstorm Warning | GID | Jewell | 46 min |
| May 9, 11:16 PM CDT | Severe Thunderstorm Warning | OAX | Washington | 44 min |
| May 9, 11:26 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 64 min |
| May 9, 11:31 PM CDT | Severe Thunderstorm Warning | TOP | Republic | 39 min |
| May 9, 11:56 PM CDT | Severe Thunderstorm Warning | TOP | Marshall, Washington | 49 min |
| May 10, 12:09 AM CDT | Severe Thunderstorm Warning | OAX | Montgomery | 51 min |
| May 10, 12:20 AM CDT | Severe Thunderstorm Warning | DMX | Cass | 30 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 2.0 hours before the alert went out and 87 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
- 1368 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 2240 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 222 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
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 |
|---|---|---|---|---|
| May 9, 10:00 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Clayton, Fayette, Winneshiek | 5 hr |
| May 10, 11:00 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Allamakee, Audubon, Benton, Black Hawk, Boone and 47 more | 5 hr |
| May 10, 4:15 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Benton, Black Hawk, Boone and 46 more | 6 hr |
| May 10, 5:00 PM CDT | Severe Thunderstorm Watch | SPC | Dubuque | 5 hr |
| May 10, 5:30 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Fremont, Mills, Montgomery, Page, Pottawattamie and 1 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2001Severe Thunderstorm Watches in Nebraska, 2001Severe Thunderstorm Watches in Kansas, 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.