Alert archive / Illinois / Mesoscale Discussions in 2007
Mesoscale Discussion 1642
The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2007, 1:01 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2007, 1:01 PM CDT (18:01 UTC)
- Expired
- Aug 4, 2007, 3:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 39 counties
Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Van Buren County, IA, Adams County, IL, Brown County, IL, Cass County, IL, Champaign County, IL, Clark County, IL, Coles County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Schuyler County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Clay County, IN, Fountain County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Vermillion County, IN, Vigo County, IN, Clark County, MO
The radar
The Lincoln radar (KILX), 17 km from the middle of the area, began a volume at 18:01 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 6.0 hours before the alert went out and 179 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
- 1795 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 45 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 |
|---|---|---|---|---|
| Aug 4, 1:49 AM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 7 more | 86 min |
| Aug 4, 2:51 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 16 more | 114 min |
| Aug 4, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Boone, Buena Vista and 50 more | 6 hr |
| Aug 4, 6:09 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Boone, Buena Vista and 40 more | 66 min |
Nearby
Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Indiana, 2007Mesoscale Discussions in Iowa, 2007Every mesoscale discussion in 2007
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.