Alert archive / Missouri / Mesoscale Discussions in 2004
Mesoscale Discussion 1854
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 11:22 AM CDT for 7 counties in Illinois; 21 counties in Missouri. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2004, 11:22 AM CDT (16:22 UTC)
- Expired
- Aug 3, 2004, 12:45 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 28 counties
Adams County, IL, Brown County, IL, Calhoun 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), 35 km from the middle of the area, began a volume at 16:22 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.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 4.4 hours before the alert went out and 347 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
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 8:40 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Greene, Jersey, Monroe and 2 more | 5 hr |
| 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
Mesoscale Discussions in Missouri, 2004Mesoscale Discussions in Illinois, 2004Every mesoscale discussion 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.