Alert archive / Iowa / Tornado Watches in 1999
Tornado Watch 410
The Storm Prediction Center issued this tornado watch at Jun 6, 1999, 6:00 PM CDT for 61 counties in Iowa; 10 counties in Missouri; Richardson County, Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 6, 1999, 6:00 PM CDT (23:00 UTC)
- Expired
- Jun 7, 1999, 12:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 72 counties
Adair County, IA, Adams County, IA, Allamakee County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clarke County, IA, Dallas County, IA, Decatur County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Iowa County, IA, Jasper County, IA, Keokuk County, IA, Kossuth County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Atchison County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Sullivan County, MO, Worth County, MO, Richardson County, NE
The radar
The Des Moines radar (KDMX), 43 km from the middle of the area, began a volume at 22:59 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
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 6:16 PM CDT | Severe Thunderstorm Warning | DMX | Greene | 34 min |
| Jun 6, 6:29 PM CDT | Tornado Warning | DMX | Adair, Cass | 31 min |
| Jun 6, 6:36 PM CDT | Tornado Warning | DMX | Boone, Greene, Webster | 49 min |
| Jun 6, 6:42 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Wright | 33 min |
| Jun 6, 7:08 PM CDT | Tornado Warning | DMX | Hamilton | 32 min |
| Jun 6, 7:31 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo | 34 min |
| Jun 6, 7:36 PM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 64 min |
| Jun 6, 7:49 PM CDT | Severe Thunderstorm Warning | DMX | Worth | 36 min |
| Jun 6, 7:55 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 60 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.0 hours before the alert went out and 193 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
- 1572 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 922 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 5.5
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 |
|---|---|---|---|---|
| Jun 5, 9:00 PM CDT | Tornado Watch | SPC | Clay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 3 more | 5 hr |
| Jun 5, 9:45 PM CDT | Tornado Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 11 more | 4 hr |
| Jun 6, 12:45 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 21 more | 5 hr |
| Jun 6, 2:00 PM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 38 more | 6 hr |
| Jun 6, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | Andrew, Buchanan, Clinton, DeKalb, Platte | 4 hr |
Nearby
Tornado Watches in Iowa, 1999Tornado Watches in Missouri, 1999Tornado Watches in Nebraska, 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.