Alert archive / Illinois / Mesoscale Discussions in 2017
Mesoscale Discussion 688
The Storm Prediction Center issued this mesoscale discussion at May 10, 2017, 3:48 PM CDT for 4 states. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- May 10, 2017, 3:48 PM CDT (20:48 UTC)
- Expired
- May 10, 2017, 5:15 PM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 45 counties
Lee County, IA, Adams County, IL, Brown County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, DeWitt County, IL, Douglas County, IL, Ford County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Iroquois County, IL, Knox County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Woodford County, IL, Benton County, IN, Warren County, IN, Clark County, MO, Knox County, MO, Lewis County, MO, Macon County, MO, Marion County, MO, Ralls County, MO, Scotland County, MO, Shelby County, MO
The radar
The Lincoln radar (KILX), 63 km from the middle of the area, began a volume at 20:49 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
Lincoln, IL (KILX), launched 12:00Z, 8.8 hours before the alert went out and 125 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
- 1 J/kg
- Mixed-layer CIN
- -516 J/kg
- Mixed-layer LCL
- 837 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 12:05 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Champaign, DeWitt, Ford and 19 more | 2 hr |
| May 10, 12:59 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Bureau, Cass, DeWitt, Fulton and 22 more | 7 hr |
| May 10, 6:26 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 11 more | 94 min |
| May 10, 1:29 AM CDT | Mesoscale Discussion | SPC | Fremont, Mills | 61 min |
| May 10, 12:39 PM CDT | Mesoscale Discussion | SPC | Bates, Benton, Boone, Caldwell, Camden, Carroll and 23 more | 3 hr |
| May 10, 6:30 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Benton, Camden, Cedar, Dade, Dallas and 14 more | 2 hr |
Nearby
Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Indiana, 2017Every mesoscale discussion in 2017
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.