Alert archive / Illinois / Mesoscale Discussions in 2017
Mesoscale Discussion 265
The Storm Prediction Center issued this mesoscale discussion at Mar 6, 2017, 8:22 PM CST for 30 counties in Illinois; Lee County, Iowa; 25 counties in Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 6, 2017, 8:22 PM CST (02:22 UTC)
- Expired
- Mar 6, 2017, 10:45 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 56 counties
Lee County, IA, Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clinton County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Jersey County, IL, Logan County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Tazewell County, IL, Warren County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Clark County, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Saint Charles 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), 79 km from the middle of the area, began a volume at 02:27 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 00:00Z, 2.4 hours before the alert went out and 201 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
- 4 J/kg
- Mixed-layer CIN
- -285 J/kg
- Mixed-layer LCL
- 651 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 475 m²/s²
- 0-3 km storm-relative helicity
- 484 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Mar 6, 7:42 PM CST | Mesoscale Discussion | SPC | Bureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 12 more | 63 min |
| Mar 6, 8:10 PM CST | Mesoscale Discussion | SPC | Alexander | 3 hr |
| Mar 6, 8:52 PM CST | Tornado Watch | SPC | Adams, Bond, Brown, Bureau, Calhoun, Carroll and 38 more | 6 hr |
| Mar 6, 10:15 PM CST | Mesoscale Discussion | SPC | Boone, DeKalb, DeWitt, Ford, Grundy, Kane and 11 more | 60 min |
| Mar 6, 10:35 PM CST | Severe Thunderstorm Watch | SPC | Boone, Champaign, Christian, Coles, Cook, DeKalb and 25 more | 4 hr |
| Mar 6, 11:13 PM CST | Mesoscale Discussion | SPC | Alexander, Bond, Calhoun, Clay, Clinton, Cumberland and 31 more | 2 hr |
| Mar 7, 1:53 AM CST | Mesoscale Discussion | SPC | Champaign, Coles, Cumberland, Douglas, Edgar, Iroquois and 3 more | 97 min |
| Mar 7, 2:58 AM CST | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 8 more | 92 min |
| Mar 6, 6:11 PM CST | Mesoscale Discussion | SPC | Adair, Adams, Allamakee, Appanoose, Audubon, Benton and 57 more | 2 hr |
| Mar 6, 6:02 PM CST | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cedar and 22 more | 58 min |
| Mar 6, 6:31 PM CST | Mesoscale Discussion | SPC | Adair, Andrew, Bates, Benton, Buchanan, Caldwell and 32 more | 119 min |
| Mar 6, 6:51 PM CST | Tornado Watch | SPC | Barry, Barton, Benton, Camden, Cedar, Christian and 28 more | 8 hr |
| Mar 6, 7:19 PM CST | Mesoscale Discussion | SPC | Buchanan, Caldwell, Carroll, Cass, Chariton, Clay and 15 more | 116 min |
| Mar 6, 9:16 PM CST | Mesoscale Discussion | SPC | Barry, McDonald | 119 min |
| Mar 6, 9:21 PM CST | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Dunklin, Perry and 3 more | 8 hr |
| Mar 7, 3:37 AM CST | Severe Thunderstorm Watch | SPC | Pemiscot | 8 hr |
Nearby
Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Iowa, 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.