Alert archive / Missouri / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 695
The Storm Prediction Center issued this severe thunderstorm watch at Aug 3, 2004, 8:40 AM CDT for 8 counties in Illinois; 21 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2004, 8:40 AM CDT (13:40 UTC)
- Expired
- Aug 3, 2004, 2:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 29 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Greene County, IL, Jersey County, IL, Monroe County, IL, Pike County, IL, Randolph County, IL, Audrain County, MO, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Perry County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shelby County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 43 km from the middle of the area, began a volume at 13:42 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 |
|---|---|---|---|---|
| Aug 3, 8:42 AM CDT | Severe Thunderstorm Warning | LSX | Marion | 48 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, 1.7 hours before the alert went out and 289 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
- 760 J/kg
- Mixed-layer CIN
- -200 J/kg
- Mixed-layer LCL
- 1021 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 11:22 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Jersey, Monroe, Pike and 1 more | 83 min |
| Aug 3, 3:55 PM CDT | Mesoscale Discussion | SPC | Adams, Carroll, Fulton, Hancock, Henderson, Henry and 7 more | 95 min |
| Aug 3, 4:25 PM CDT | Tornado Watch | SPC | Bureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 7 more | 6 hr |
| Aug 3, 5:39 PM CDT | Mesoscale Discussion | SPC | Carroll, Henderson, Henry, Jo Daviess, Knox, Mercer and 3 more | 66 min |
| Aug 3, 6:34 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 7 more | 86 min |
| Aug 3, 4:52 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Holt, Nodaway | 53 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.