Alert archive / Illinois / Mesoscale Discussions in 2004
Mesoscale Discussion 514
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2004, 1:52 PM CDT for 21 counties in Illinois; Ballard County, Livingston County, McCracken County, Kentucky; 9 counties in Missouri. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2004, 1:52 PM CDT (18:52 UTC)
- Expired
- Apr 30, 2004, 3:45 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 33 counties
Alexander County, IL, Clinton County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Washington County, IL, Wayne County, IL, Williamson County, IL, Ballard County, KY, Livingston County, KY, McCracken County, KY, Bollinger County, MO, Cape Girardeau County, MO, Iron County, MO, Madison County, MO, Perry County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Wayne County, MO
The radar
The Paducah radar (KPAH), 96 km from the middle of the area, began a volume at 18:55 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
Lincoln, IL (KILX), launched 12:00Z, 6.9 hours before the alert went out and 292 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
- 720 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Apr 30, 10:59 AM CDT | Mesoscale Discussion | SPC | Adams, Alexander, Bond, Brown, Calhoun, Cass and 54 more | 2 hr |
| Apr 30, 5:50 PM CDT | Severe Thunderstorm Watch | SPC | Crawford, Lawrence | 3 hr |
| Apr 30, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Christian, McDonald, Stone | 5 hr |
Nearby
Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Missouri, 2004Mesoscale Discussions in Kentucky, 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.