Alert archive / Iowa / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 629
The Storm Prediction Center issued this severe thunderstorm watch at Aug 22, 2002, 7:40 PM CDT for 24 counties in Iowa; Atchison County, Holt County, Nodaway County, Missouri; 19 counties in Nebraska. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 22, 2002, 7:40 PM CDT (00:40 UTC)
- Expired
- Aug 23, 2002, 1:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 46 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Atchison County, MO, Holt County, MO, Nodaway County, MO, Burt County, NE, Cass 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, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE
The radar
The Omaha radar (KOAX), 53 km from the middle of the area, began a volume at 00:40 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
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 7:48 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Otoe | 27 min |
| Aug 22, 8:23 PM CDT | Severe Thunderstorm Warning | OAX | Fremont | 52 min |
| Aug 22, 8:42 PM CDT | Severe Thunderstorm Warning | OAX | Washington | 33 min |
| Aug 22, 8:51 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 39 min |
| Aug 22, 9:07 PM CDT | Tornado Warning | OAX | Fremont | 23 min |
| Aug 22, 9:09 PM CDT | Tornado Warning | OAX | Saunders | 36 min |
| Aug 22, 9:21 PM CDT | Tornado Warning | OAX | Douglas | 24 min |
| Aug 22, 9:31 PM CDT | Severe Thunderstorm Warning | OAX | Saunders | 29 min |
| Aug 22, 9:47 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 43 min |
| Aug 22, 9:58 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 47 min |
| Aug 22, 10:01 PM CDT | Severe Thunderstorm Warning | OAX | Sarpy, Saunders | 29 min |
| Aug 22, 11:21 PM CDT | Severe Thunderstorm Warning | OAX | Cass | 54 min |
| Aug 22, 11:37 PM CDT | Flash Flood Warning | OAX | Cass | 4 hr |
| Aug 23, 12:04 AM CDT | Flash Flood Warning | OAX | Mills | 6 hr |
| Aug 23, 12:15 AM CDT | Flash Flood Warning | DMX | Audubon, Dallas, Guthrie, Polk | 6 hr |
| Aug 23, 12:15 AM CDT | Flash Flood Warning | DMX | Audubon, Dallas, Guthrie, Polk | 18 hr |
| Aug 23, 12:28 AM CDT | Severe Thunderstorm Warning | DMX | Polk | 47 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.7 hours before the alert went out and 53 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
- 3464 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 856 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 196 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 11.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 6:55 PM CDT | Severe Thunderstorm Watch | SPC | Chase, Dundy, Perkins | 6 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in Nebraska, 2002Severe Thunderstorm Watches in Missouri, 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.