Alert archive / Missouri / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 604
The Storm Prediction Center issued this severe thunderstorm watch at Jul 11, 2004, 3:00 PM CDT for 7 counties in Illinois; 23 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 11, 2004, 3:00 PM CDT (20:00 UTC)
- Expired
- Jul 11, 2004, 8:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 30 counties
Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Morgan County, IL, Pike County, IL, Scott County, IL, Audrain County, MO, Boone County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, City of Saint Louis, MO, Grundy County, MO, Howard County, MO, Lincoln County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Saint Charles County, MO, Saline County, MO, Shelby County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 176 km from the middle of the area, began a volume at 19:59 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
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 5:40 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Shelby | 50 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
Davenport, (KDVN), launched 12:00Z, 8.0 hours before the alert went out and 272 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
- 339 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 706 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 35 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 |
|---|---|---|---|---|
| Jul 11, 10:14 AM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, DuPage, Ford, Fulton and 24 more | 91 min |
| Jul 11, 11:40 AM CDT | Severe Thunderstorm Watch | SPC | Bureau, Carroll, Cass, Champaign, Cook, DeKalb and 40 more | 6 hr |
| Jul 11, 5:19 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Champaign, Christian, Clinton, Coles and 18 more | 116 min |
| Jul 11, 5:40 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 16 more | 5 hr |
| Jul 11, 10:33 AM CDT | Mesoscale Discussion | SPC | Atchison | 117 min |
| Jul 11, 11:55 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Atchison, Gentry, Grundy, Harrison, Holt and 5 more | 6 hr |
| Jul 11, 2:04 PM CDT | Mesoscale Discussion | SPC | Atchison | 116 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2004Severe Thunderstorm Watches in Illinois, 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.