Alert archive / Iowa / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 819
The Storm Prediction Center issued this severe thunderstorm watch at Sep 14, 2004, 2:45 PM CDT for 39 counties in Iowa; Freeborn County, Minnesota; 19 counties in Nebraska. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 14, 2004, 2:45 PM CDT (19:45 UTC)
- Expired
- Sep 14, 2004, 10:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 59 counties
Adair County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Crawford County, IA, Dallas County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Madison County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Freeborn 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, Jefferson County, NE, Lancaster County, NE, Otoe County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE
The radar
The Omaha radar (KOAX), 101 km from the middle of the area, began a volume at 19:48 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
22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 4:21 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 39 min |
| Sep 14, 4:30 PM CDT | Severe Thunderstorm Warning | OAX | Burt | 45 min |
| Sep 14, 4:42 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 33 min |
| Sep 14, 4:44 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth | 31 min |
| Sep 14, 4:59 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 31 min |
| Sep 14, 5:11 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 34 min |
| Sep 14, 5:12 PM CDT | Severe Thunderstorm Warning | OAX | Burt | 33 min |
| Sep 14, 5:16 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 44 min |
| Sep 14, 5:43 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 47 min |
| Sep 14, 6:00 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 30 min |
| Sep 14, 6:02 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 28 min |
| Sep 14, 6:12 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 18 min |
| Sep 14, 6:30 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 45 min |
| Sep 14, 6:49 PM CDT | Flash Flood Warning | MPX | Faribault, Freeborn, Martin | 6 hr |
| Sep 14, 6:51 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth | 39 min |
| Sep 14, 6:59 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 46 min |
| Sep 14, 7:12 PM CDT | Flash Flood Warning | FSD | Buena Vista, Cherokee, Clay, Dickinson, O'Brien | 4 hr |
| Sep 14, 7:16 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 44 min |
| Sep 14, 7:28 PM CDT | Severe Thunderstorm Warning | MPX | Freeborn, Steele | 47 min |
| Sep 14, 7:41 PM CDT | Flash Flood Warning | DMX | Kossuth | 4 hr |
| Sep 14, 8:35 PM CDT | Flash Flood Warning | DMX | Emmet, Palo Alto | 5 hr |
| Sep 14, 9:26 PM CDT | Flash Flood Warning | DMX | Winnebago | 6 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 7.8 hours before the alert went out and 101 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
- 102 J/kg
- Mixed-layer CIN
- -267 J/kg
- Mixed-layer LCL
- 1304 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 192 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 8:59 PM CDT | Mesoscale Discussion | SPC | Lyon, O'Brien, Osceola, Plymouth, Sioux | 61 min |
| Sep 14, 1:47 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Calhoun, Carroll, Cass and 23 more | 88 min |
| Sep 14, 5:14 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 32 more | 2 hr |
| Sep 14, 2:49 PM CDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Chase, Cheyenne, Deuel and 16 more | 116 min |
| Sep 14, 3:20 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Banner, Chase, Cheyenne, Deuel, Dundy and 4 more | 7 hr |
| Sep 14, 6:44 PM CDT | Mesoscale Discussion | SPC | Adams, Arthur, Banner, Blaine, Boone, Buffalo and 47 more | 91 min |
Nearby
Severe Thunderstorm Watches in Iowa, 2004Severe Thunderstorm Watches in Nebraska, 2004Severe Thunderstorm Watches in Minnesota, 2004Every severe thunderstorm watch in 2004
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.