Alert archive / Iowa / Tornado Watches in 1999
Tornado Watch 272
The Storm Prediction Center issued this tornado watch at May 16, 1999, 3:00 PM CDT for 43 counties in Iowa; 6 counties in Missouri; 15 counties in Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 16, 1999, 3:00 PM CDT (20:00 UTC)
- Expired
- May 16, 1999, 9:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 64 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Ida County, IA, Jasper County, IA, Madison County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Atchison County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Burt County, NE, Cass County, NE, Douglas 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, Washington County, NE
The radar
The Omaha radar (KOAX), 81 km from the middle of the area, began a volume at 20:00 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
48 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 3:07 PM CDT | Tornado Warning | OAX | Harrison | 33 min |
| May 16, 3:19 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 36 min |
| May 16, 3:23 PM CDT | Tornado Warning | OAX | Mills | 37 min |
| May 16, 3:24 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 36 min |
| May 16, 3:32 PM CDT | Tornado Warning | OAX | Monona | 33 min |
| May 16, 3:37 PM CDT | Tornado Warning | OAX | Harrison | 48 min |
| May 16, 3:42 PM CDT | Tornado Warning | DMX | Crawford | 33 min |
| May 16, 3:47 PM CDT | Tornado Warning | OAX | Pottawattamie | 48 min |
| May 16, 3:49 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 26 min |
| May 16, 3:56 PM CDT | Tornado Warning | OAX | Mills | 34 min |
| May 16, 4:00 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 30 min |
| May 16, 4:13 PM CDT | Tornado Warning | DMX | Crawford | 17 min |
| May 16, 4:16 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee | 29 min |
| May 16, 4:20 PM CDT | Tornado Warning | DMX | Crawford | 50 min |
| May 16, 4:20 PM CDT | Tornado Warning | FSD | Ida | 30 min |
| May 16, 4:22 PM CDT | Tornado Warning | OAX | Harrison | 48 min |
| May 16, 4:24 PM CDT | Tornado Warning | OAX | Pottawattamie | 51 min |
| May 16, 4:27 PM CDT | Tornado Warning | OAX | Mills | 33 min |
| May 16, 4:33 PM CDT | Severe Thunderstorm Warning | DMX | Hardin | 32 min |
| May 16, 4:38 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Grundy | 32 min |
| May 16, 4:43 PM CDT | Tornado Warning | DMX | Sac | 47 min |
| May 16, 5:01 PM CDT | Tornado Warning | OAX | Shelby | 44 min |
| May 16, 5:05 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Woodbury | 30 min |
| May 16, 5:11 PM CDT | Tornado Warning | OAX | Harrison | 34 min |
| May 16, 5:14 PM CDT | Tornado Warning | OAX | Pottawattamie | 46 min |
| May 16, 5:33 PM CDT | Tornado Warning | OAX | Mills | 37 min |
| May 16, 5:45 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien | 30 min |
| May 16, 5:45 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 35 min |
| May 16, 6:00 PM CDT | Tornado Warning | OAX | Pottawattamie | 30 min |
| May 16, 6:11 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery | 49 min |
| May 16, 6:13 PM CDT | Severe Thunderstorm Warning | DMX | Cass | 32 min |
| May 16, 6:17 PM CDT | Flash Flood Warning | DMX | Hardin | 2 hr |
| May 16, 6:26 PM CDT | Severe Thunderstorm Warning | DMX | Butler | 34 min |
| May 16, 6:27 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha, Pawnee, Richardson | 33 min |
| May 16, 6:33 PM CDT | Tornado Warning | OAX | Pottawattamie | 32 min |
| May 16, 6:37 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery | 48 min |
| May 16, 6:38 PM CDT | Tornado Warning | DMX | Audubon, Cass | 47 min |
| May 16, 6:43 PM CDT | Flash Flood Warning | OAX | Pottawattamie | 6 hr |
| May 16, 6:55 PM CDT | Tornado Warning | OAX | Mills, Montgomery | 35 min |
| May 16, 7:01 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha, Richardson | 49 min |
| May 16, 7:37 PM CDT | Flash Flood Warning | OAX | Montgomery | 6 hr |
| May 16, 7:44 PM CDT | Tornado Warning | DMX | Boone, Dallas | 31 min |
| May 16, 7:52 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison, Polk, Warren | 48 min |
| May 16, 8:16 PM CDT | Flash Flood Warning | DMX | Cass | 3 hr |
| May 16, 8:17 PM CDT | Tornado Warning | DMX | Boone, Story | 33 min |
| May 16, 8:36 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall | 49 min |
| May 16, 8:44 PM CDT | Tornado Warning | DMX | Hamilton, Story | 31 min |
| May 16, 9:00 PM CDT | Tornado Warning | DMX | Hardin | 50 min |
The nearest sounding before it
Topeka, KS (KTOP), launched 12:00Z, 8.0 hours before the alert went out and 235 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
- 3044 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 631 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 562 m²/s²
- 0-3 km storm-relative helicity
- 521 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.9
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 15, 9:45 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills | 6 hr |
| May 16, 6:00 AM CDT | Severe Thunderstorm Watch | SPC | Cherokee, Crawford, Fremont, Harrison, Ida, Lyon and 11 more | 5 hr |
| May 16, 9:45 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 64 more | 5 hr |
| May 16, 2:15 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Benton, Black Hawk, Buchanan, Clayton, Clinton and 8 more | 6 hr |
| May 16, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Chickasaw and 10 more | 6 hr |
| May 16, 5:30 PM CDT | Severe Thunderstorm Watch | SPC | Cerro Gordo, Chickasaw, Clay, Emmet, Floyd, Hancock and 7 more | 6 hr |
| May 16, 4:00 PM CDT | Tornado Watch | SPC | Andrew, Buchanan, Clay, Clinton, DeKalb, Platte | 6 hr |
Nearby
Tornado Watches in Iowa, 1999Tornado Watches in Nebraska, 1999Tornado Watches in Missouri, 1999Every tornado watch in 1999
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.