Alert archive / Iowa / Tornado Watches in 1998
Tornado Watch 394
The Storm Prediction Center issued this tornado watch at May 21, 1998, 11:30 PM CDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 21, 1998, 11:30 PM CDT (04:30 UTC)
- Expired
- May 22, 1998, 5:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 38 counties
Adair County, IA, Adams County, IA, Cass County, IA, Fremont County, IA, Harrison County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Brown County, KS, Doniphan County, KS, Andrew County, MO, Atchison County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Dodge 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, Saunders County, NE, Washington County, NE
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 12:02 AM CDT | Tornado Warning | OAX | Lancaster | 33 min |
| May 22, 12:16 AM CDT | Tornado Warning | OAX | Lancaster | 19 min |
| May 22, 12:19 AM CDT | Severe Thunderstorm Warning | OAX | Sarpy | 46 min |
| May 22, 12:38 AM CDT | Severe Thunderstorm Warning | OAX | Cass | 62 min |
| May 22, 12:44 AM CDT | Severe Thunderstorm Warning | OAX | Saunders | 16 min |
| May 22, 12:46 AM CDT | Flash Flood Warning | OAX | Lancaster, Saunders | 5 hr |
| May 22, 1:04 AM CDT | Severe Thunderstorm Warning | OAX | Sarpy | 46 min |
| May 22, 1:48 AM CDT | Severe Thunderstorm Warning | OAX | Gage, Lancaster | 62 min |
| May 22, 1:53 AM CDT | Severe Thunderstorm Warning | DMX | Adair | 32 min |
| May 22, 2:15 AM CDT | Severe Thunderstorm Warning | DMX | Madison | 45 min |
| May 22, 2:36 AM CDT | Severe Thunderstorm Warning | OAX | Page | 64 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.5 hours before the alert went out and 69 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
- 66 J/kg
- Mixed-layer CIN
- -295 J/kg
- Mixed-layer LCL
- 905 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 300 m²/s²
- 0-3 km storm-relative helicity
- 484 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.6
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 21, 11:00 PM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Clarke, Davis, Decatur, Henry, Jefferson and 9 more | 6 hr |
| May 22, 2:00 AM CDT | Severe Thunderstorm Watch | SPC | Des Moines, Lee | 5 hr |
| May 22, 6:45 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Rawlins | 5 hr |
| May 22, 5:30 PM CDT | Tornado Watch | SPC | Audrain, Callaway, Cape Girardeau, Crawford, Dent, Franklin and 18 more | 6 hr |
| May 21, 8:30 PM CDT | Tornado Watch | SPC | Adams, Buffalo, Butler, Chase, Clay, Custer and 31 more | 6 hr |
| May 22, 2:30 PM CDT | Severe Thunderstorm Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 7 hr |
Nearby
Tornado Watches in Iowa, 1998Tornado Watches in Nebraska, 1998Tornado Watches in Missouri, 1998Every tornado watch in 1998
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.