Alert archive / Illinois / Mesoscale Discussions / 2009
Mesoscale Discussions in Illinois, August 2009
17 mesoscale discussions in August 2009. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of mesoscale discussions reaches back to 2003.
Mesoscale Discussions by county
Each county as a circle sized by its count in August 2009. Tap one for its archive.
- Mesoscale Discussions
- 17
- Busiest day
- August 4, 20093 mesoscale discussions
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 4:06 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Greene and 10 more | 84 min |
| Aug 4, 7:11 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 8 more | 94 min |
| Aug 4, 2:36 PM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more | 84 min |
| Aug 4, 6:21 PM CDT | Mesoscale Discussion | SPC | Alexander, Johnson, Massac, Pope, Pulaski, Union | 114 min |
| Aug 4, 8:35 PM CDT | Mesoscale Discussion | SPC | Alexander, Massac, Pulaski, Union | 85 min |
| Aug 8, 1:29 AM CDT | Mesoscale Discussion | SPC | Jo Daviess | 2 hr |
| Aug 9, 9:55 AM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Henry, Jo Daviess, Lee, Mercer and 5 more | 35 min |
| Aug 9, 8:30 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Henderson, Henry and 15 more | 90 min |
| Aug 9, 10:55 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Kane and 8 more | 95 min |
| Aug 10, 5:58 PM CDT | Mesoscale Discussion | SPC | Gallatin, Hardin, Johnson, Pope, Saline, Williamson | 2 hr |
| Aug 17, 1:22 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Fulton, Hancock, Henderson and 11 more | 83 min |
| Aug 19, 11:51 AM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Bureau, Calhoun, Cass and 45 more | 114 min |
| Aug 19, 3:19 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 22 more | 86 min |
| Aug 19, 7:45 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Henry, Jo Daviess, Mercer, Putnam and 3 more | 90 min |
| Aug 20, 2:18 AM CDT | Mesoscale Discussion | SPC | Clinton, Jackson, Monroe, Perry, Randolph, Saint Clair and 2 more | 87 min |
| Aug 20, 1:51 PM CDT | Mesoscale Discussion | SPC | Jo Daviess | 114 min |
| Aug 27, 10:31 PM CDT | Mesoscale Discussion | SPC | Champaign, Douglas, Edgar, McLean, Piatt, Vermilion | 89 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Jo Daviess County5
- Henry County5
- Mercer County5
- Rock Island County5
- Whiteside County5
- Bureau County5
- Adams County4
- Brown County4
- Hancock County4
- Pike County4
- Schuyler County4
- Henderson County4
- Union County4
- Stephenson County4
- LaSalle County4
- Putnam County4
- Stark County4
- Calhoun County3
- Cass County3
- Greene County3
- Montgomery County3
- Morgan County3
- Scott County3
- Fulton County3
- McDonough County3
- Warren County3
- Alexander County3
- Johnson County3
- Massac County3
- Pope County3
- Pulaski County3
- Boone County3
- Carroll County3
- Lee County3
- Ogle County3
- Winnebago County3
- Knox County3
- Marshall County3
- Peoria County3
- Champaign County3
48 more counties
- Douglas County3
- McLean County3
- Piatt County3
- Bond County2
- Jersey County2
- Macoupin County2
- Madison County2
- Sangamon County2
- Gallatin County2
- Hardin County2
- Jackson County2
- Saline County2
- Williamson County2
- DeKalb County2
- Kane County2
- Kendall County2
- Christian County2
- Coles County2
- Cumberland County2
- DeWitt County2
- Ford County2
- Livingston County2
- Logan County2
- Macon County2
- Moultrie County2
- Shelby County2
- Tazewell County2
- Woodford County2
- Edgar County2
- Vermilion County2
- Cook County1
- DuPage County1
- Lake County1
- McHenry County1
- Effingham County1
- Fayette County1
- Mason County1
- Menard County1
- Clark County1
- Grundy County1
- Iroquois County1
- Kankakee County1
- Clinton County1
- Monroe County1
- Perry County1
- Randolph County1
- Saint Clair County1
- Washington County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.