Alert archive / Nebraska / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 96
The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 2004, 6:25 PM CDT for 8 counties in Iowa; Atchison County, Missouri; 26 counties in Nebraska. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2004, 6:25 PM CDT (23:25 UTC)
- Expired
- Apr 20, 2004, 11:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Atchison County, MO, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Nance County, NE, Otoe County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 6:43 PM CDT | Tornado Warning | OAX | Madison | 47 min |
| Apr 20, 6:48 PM CDT | Tornado Warning | OAX | Antelope | 12 min |
| Apr 20, 7:27 PM CDT | Severe Thunderstorm Warning | OAX | Stanton | 48 min |
| Apr 20, 7:50 PM CDT | Severe Thunderstorm Warning | OAX | Cuming | 40 min |
| Apr 20, 8:12 PM CDT | Severe Thunderstorm Warning | OAX | Dodge | 48 min |
| Apr 20, 8:19 PM CDT | Severe Thunderstorm Warning | OAX | Burt | 41 min |
| Apr 20, 8:30 PM CDT | Severe Thunderstorm Warning | OAX | Washington | 45 min |
| Apr 20, 8:52 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 38 min |
| Apr 20, 9:26 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 49 min |
| Apr 20, 9:33 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 27 min |
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, 11.4 hours before the alert went out and 82 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
- 13 J/kg
- Mixed-layer CIN
- -209 J/kg
- Mixed-layer LCL
- 546 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Clarke, Davis, Decatur, Henry, Jefferson and 13 more | 5 hr |
| Apr 20, 5:40 PM CDT | Tornado Watch | SPC | Scott | 5 hr |
| Apr 20, 6:00 PM CDT | Mesoscale Discussion | SPC | Scott | 2 hr |
| Apr 20, 2:05 PM CDT | Tornado Watch | SPC | Barry, Barton, Cedar, Dade, Jasper, Lawrence and 4 more | 6 hr |
| Apr 20, 5:16 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Cedar, Dade, Jasper, Lawrence and 4 more | 119 min |
| Apr 20, 12:05 PM CDT | Mesoscale Discussion | SPC | Boyd, Keya Paha | 85 min |
| Apr 20, 5:12 PM CDT | Mesoscale Discussion | SPC | Antelope, Boone, Garfield, Holt, Knox, Madison and 5 more | 3 hr |
Nearby
Severe Thunderstorm Watches in Nebraska, 2004Severe Thunderstorm Watches in Iowa, 2004Severe Thunderstorm Watches in Missouri, 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.