Alert archive / Iowa / Tornado Watches in 1999
Tornado Watch 674
The Storm Prediction Center issued this tornado watch at Sep 7, 1999, 5:15 PM CDT for 27 counties in Iowa; 9 counties in Minnesota; 25 counties in Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 7, 1999, 5:15 PM CDT (22:15 UTC)
- Expired
- Sep 7, 1999, 11:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 61 counties
Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Fremont County, IA, Hancock County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mills County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Winnebago County, IA, Woodbury County, IA, Blue Earth County, MN, Cottonwood County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota 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, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Thurston County, NE, Washington County, NE, York County, NE
The radar
The Omaha radar (KOAX), 48 km from the middle of the area, began a volume at 22:18 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
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 5:35 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth | 35 min |
| Sep 7, 5:45 PM CDT | Severe Thunderstorm Warning | MPX | Faribault | 45 min |
| Sep 7, 5:48 PM CDT | Severe Thunderstorm Warning | MPX | Steele, Waseca | 57 min |
| Sep 7, 6:24 PM CDT | Severe Thunderstorm Warning | GID | Fillmore, Thayer | 51 min |
| Sep 7, 6:28 PM CDT | Severe Thunderstorm Warning | MPX | Faribault | 47 min |
| Sep 7, 6:45 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Pottawattamie | 65 min |
| Sep 7, 6:50 PM CDT | Severe Thunderstorm Warning | DMX | Audubon | 35 min |
| Sep 7, 6:55 PM CDT | Severe Thunderstorm Warning | GID | Thayer | 65 min |
| Sep 7, 7:00 PM CDT | Severe Thunderstorm Warning | DMX | Pocahontas | 30 min |
| Sep 7, 7:08 PM CDT | Severe Thunderstorm Warning | MPX | Steele | 37 min |
| Sep 7, 7:24 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth | 31 min |
| Sep 7, 7:33 PM CDT | Severe Thunderstorm Warning | DMX | Hancock | 32 min |
| Sep 7, 7:45 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt | 35 min |
| Sep 7, 8:32 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 63 min |
The nearest sounding before it
Topeka, KS (KTOP), launched 12:00Z, 10.3 hours before the alert went out and 304 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
- 157 J/kg
- Mixed-layer CIN
- -297 J/kg
- Mixed-layer LCL
- 1545 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Sep 7, 6:15 PM CDT | Tornado Watch | SPC | Adair, Adams, Boone, Bremer, Butler, Cass and 27 more | 6 hr |
Nearby
Tornado Watches in Iowa, 1999Tornado Watches in Nebraska, 1999Tornado Watches in Minnesota, 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.