Alert archive / Missouri / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 94
The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 2004, 4:40 PM CDT for 19 counties in Iowa; 43 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2004, 4:40 PM CDT (21:40 UTC)
- Expired
- Apr 20, 2004, 10:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 62 counties
Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Ringgold County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Adair County, MO, Audrain County, MO, Bates County, MO, Benton County, MO, Boone County, MO, Caldwell County, MO, Callaway County, MO, Carroll County, MO, Cass County, MO, Chariton County, MO, Clark County, MO, Clay County, MO, Clinton County, MO, Cole County, MO, Cooper County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Henry County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Knox County, MO, Lafayette County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Mercer County, MO, Moniteau County, MO, Monroe County, MO, Morgan County, MO, Pettis County, MO, Putnam County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Dallas, Madison | 42 min |
| Apr 20, 5:33 PM CDT | Severe Thunderstorm Warning | EAX | Cass | 57 min |
| Apr 20, 6:44 PM CDT | Severe Thunderstorm Warning | EAX | Cass, Johnson | 61 min |
| Apr 20, 6:59 PM CDT | Tornado Warning | EAX | Saline | 61 min |
| Apr 20, 7:08 PM CDT | Severe Thunderstorm Warning | EAX | Henry | 67 min |
| Apr 20, 9:52 PM CDT | Severe Thunderstorm Warning | LSX | Callaway | 23 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
Topeka, KS (KTOP), launched 12:00Z, 9.7 hours before the alert went out and 206 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 968 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 189 m²/s²
- 0-3 km storm-relative helicity
- 314 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 |
|---|---|---|---|---|
| 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, 6:25 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 5 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 |
Nearby
Severe Thunderstorm Watches in Missouri, 2004Severe Thunderstorm Watches in Iowa, 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.