Alert archive / Iowa / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 618
The Storm Prediction Center issued this severe thunderstorm watch at Aug 17, 2002, 1:05 AM CDT for 43 counties in Iowa; 11 counties in Minnesota; 25 counties in Nebraska. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2002, 1:05 AM CDT (06:05 UTC)
- Expired
- Aug 17, 2002, 6:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 79 counties
Adair County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene 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, Mills County, IA, Mitchell 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, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Martin County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Waseca County, MN, Winona County, MN, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Polk 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), 63 km from the middle of the area, began a volume at 06:07 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
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 1:06 AM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 39 min |
| Aug 17, 1:08 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 37 min |
| Aug 17, 1:15 AM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 45 min |
| Aug 17, 1:35 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 40 min |
| Aug 17, 1:39 AM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 36 min |
| Aug 17, 1:42 AM CDT | Severe Thunderstorm Warning | OAX | Colfax, Dodge | 48 min |
| Aug 17, 1:44 AM CDT | Severe Thunderstorm Warning | DMX | Palo Alto | 46 min |
| Aug 17, 1:45 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 30 min |
| Aug 17, 1:53 AM CDT | Severe Thunderstorm Warning | OAX | Burt | 22 min |
| Aug 17, 2:15 AM CDT | Severe Thunderstorm Warning | FSD | Ida | 45 min |
| Aug 17, 2:24 AM CDT | Severe Thunderstorm Warning | DMX | Sac | 51 min |
| Aug 17, 2:55 AM CDT | Severe Thunderstorm Warning | OAX | Cass, Lancaster, Otoe, Sarpy | 35 min |
| Aug 17, 3:03 AM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson, Saline | 42 min |
| Aug 17, 3:05 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun | 40 min |
| Aug 17, 3:13 AM CDT | Severe Thunderstorm Warning | DMX | Webster | 47 min |
| Aug 17, 3:13 AM CDT | Severe Thunderstorm Warning | OAX | Johnson, Pawnee | 32 min |
| Aug 17, 3:27 AM CDT | Severe Thunderstorm Warning | OAX | Nemaha, Richardson | 33 min |
| Aug 17, 3:33 AM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Wright | 57 min |
| Aug 17, 3:38 AM CDT | Severe Thunderstorm Warning | DMX | Boone | 37 min |
| Aug 17, 3:45 AM CDT | Severe Thunderstorm Warning | DMX | Greene | 30 min |
| Aug 17, 3:49 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams | 56 min |
| Aug 17, 3:51 AM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson, Johnson, Pawnee | 24 min |
| Aug 17, 3:58 AM CDT | Severe Thunderstorm Warning | DMX | Franklin, Hardin | 42 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 6.1 hours before the alert went out and 63 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
- 3070 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1356 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 229 m²/s²
- 0-3 km storm-relative helicity
- 597 m²/s²
- Significant tornado parameter
- 3.9
- Supercell composite
- 18.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 3:45 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Allamakee, Appanoose, Benton, Black Hawk, Bremer and 37 more | 5 hr |
| Aug 16, 10:00 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Becker, Benton, Big Stone, Carver, Chippewa and 39 more | 5 hr |
| Aug 16, 11:20 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Antelope, Boone, Buffalo, Cedar, Colfax and 36 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in Nebraska, 2002Severe Thunderstorm Watches in Minnesota, 2002Every severe thunderstorm watch in 2002
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.