Alert archive / Illinois / Dense Fog Advisories
Dense Fog Advisories in Illinois, 2009
60 dense fog advisories in 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 dense fog advisories reaches back to 2005.
Dense Fog Advisories by county
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Dense Fog Advisories
- 60
- Busiest month
- September28 dense fog advisories
- Busiest day
- September 26, 20096 dense fog advisories
Over time
By month
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 |
|---|---|---|---|---|
| Jan 3, 3:46 PM CST | Dense Fog Advisory | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 4 more | 10 hr |
| Jan 3, 6:07 PM CST | Dense Fog Advisory | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 6 more | 9 hr |
| Jan 3, 8:40 PM CST | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Clark, Coles, Cumberland and 23 more | 9 hr |
| Jan 3, 9:25 PM CST | Dense Fog Advisory | LOT | Ford, Grundy, Iroquois, LaSalle, Livingston | 8 hr |
| Jan 31, 2:41 AM CST | Dense Fog Advisory | PAH | Alexander, Hardin, Jackson, Johnson, Massac, Pope and 3 more | 7 hr |
| Feb 11, 1:31 AM CST | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Grundy, Kane, Kankakee and 8 more | 7 hr |
| Feb 18, 4:13 AM CST | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Kane, Lake, Lee and 3 more | 5 hr |
| Feb 26, 3:28 AM CST | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Coles, DeWitt, Douglas and 18 more | 7 hr |
| Feb 26, 3:50 AM CST | Dense Fog Advisory | LOT | DeKalb, DuPage, Ford, Grundy, Iroquois, Kane and 6 more | 11 hr |
| Feb 26, 10:09 AM CST | Dense Fog Advisory | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 4 more | 4 hr |
| Mar 6, 5:29 AM CST | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Kane, Lake, Lee and 3 more | 5 hr |
| Mar 10, 9:25 AM CDT | Dense Fog Advisory | DVN | Carroll, Henderson, Jo Daviess, Mercer, Rock Island, Stephenson | 4 hr |
| Mar 17, 3:52 AM CDT | Dense Fog Advisory | PAH | Alexander, Massac, Pope, Pulaski | 4 hr |
| Apr 23, 11:42 PM CDT | Dense Fog Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 8 hr |
| Apr 24, 2:16 AM CDT | Dense Fog Advisory | LOT | DeKalb, Grundy, Kane, Kendall, LaSalle, Lee and 1 more | 6 hr |
| Apr 30, 3:04 AM CDT | Dense Fog Advisory | LOT | Lake | 6 hr |
| May 7, 12:53 AM CDT | Dense Fog Advisory | PAH | Edwards, Franklin, Gallatin, Hamilton, Jefferson, Saline and 3 more | 8 hr |
| May 7, 1:13 AM CDT | Dense Fog Advisory | ILX | Clark, Clay, Coles, Crawford, Cumberland, Edgar and 5 more | 8 hr |
| Jul 5, 3:58 AM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Grundy, Kane, Kendall and 6 more | 5 hr |
| Aug 2, 4:07 AM CDT | Dense Fog Advisory | PAH | Alexander, Hardin, Jackson, Johnson, Massac, Perry and 4 more | 4 hr |
| Aug 4, 4:29 AM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 4 hr |
| Sep 5, 8:08 AM CDT | Dense Fog Advisory | LOT | DuPage, Grundy, Kane, Kendall | 3 hr |
| Sep 6, 9:04 PM CDT | Dense Fog Advisory | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 12 hr |
| Sep 6, 11:22 PM CDT | Dense Fog Advisory | DVN | Hancock, Henderson, McDonough, Warren | 10 hr |
| Sep 6, 11:38 PM CDT | Dense Fog Advisory | ILX | Cass, Christian, Clark, Clay, Coles, Crawford and 24 more | 9 hr |
| Sep 9, 4:45 AM CDT | Dense Fog Advisory | ILX | Champaign, Christian, Clark, Clay, Coles, Crawford and 14 more | 6 hr |
| Sep 9, 9:19 PM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 12 hr |
| Sep 9, 9:22 PM CDT | Dense Fog Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 13 hr |
| Sep 10, 2:39 AM CDT | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 7 hr |
| Sep 10, 3:10 PM CDT | Dense Fog Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 18 hr |
| Sep 10, 8:43 PM CDT | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Clark, Coles, Cumberland and 23 more | 11 hr |
| Sep 10, 8:44 PM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Ford, Iroquois, Kane and 7 more | 11 hr |
| Sep 10, 8:50 PM CDT | Dense Fog Advisory | LSX | Adams, Brown, Pike | 12 hr |
| Sep 12, 4:08 AM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more | 5 hr |
| Sep 12, 9:05 AM CDT | Dense Fog Advisory | LOT | DuPage, Lake | 73 min |
| Sep 12, 9:43 PM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 11 hr |
| Sep 13, 4:44 AM CDT | Dense Fog Advisory | DVN | Bureau, Putnam | 4 hr |
| Sep 13, 4:55 AM CDT | Dense Fog Advisory | ILX | Champaign, DeWitt, McLean, Marshall, Peoria, Piatt and 4 more | 4 hr |
| Sep 13, 9:06 AM CDT | Dense Fog Advisory | DVN | Bureau, Putnam | 54 min |
| Sep 21, 4:07 AM CDT | Dense Fog Advisory | LSX | Adams, Brown, Pike | 5 hr |
| Sep 24, 7:36 AM CDT | Dense Fog Advisory | LOT | Boone, Lake, McHenry, Winnebago | 53 min |
| Sep 25, 8:51 PM CDT | Dense Fog Advisory | ILX | Champaign, Christian, Clark, Clay, Coles, Crawford and 25 more | 13 hr |
| Sep 25, 11:11 PM CDT | Dense Fog Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 11 hr |
| Sep 26, 12:59 AM CDT | Dense Fog Advisory | DVN | Bureau, Carroll, Henry, Jo Daviess, Mercer, Putnam and 3 more | 6 hr |
| Sep 26, 3:55 AM CDT | Dense Fog Advisory | LSX | Bond, Clinton, Fayette, Macoupin, Marion, Montgomery and 1 more | 5 hr |
| Sep 26, 4:41 AM CDT | Dense Fog Advisory | LOT | Ford, LaSalle, Lee, Livingston, Ogle | 5 hr |
| Sep 26, 7:11 AM CDT | Dense Fog Advisory | DVN | Bureau, Carroll, Henry, Jo Daviess, Mercer, Putnam and 3 more | 3 hr |
| Sep 26, 9:38 PM CDT | Dense Fog Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 12 hr |
| Sep 27, 5:55 AM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 4 hr |
| Oct 27, 4:15 AM CDT | Dense Fog Advisory | LOT | Boone, DeKalb, Lee, McHenry, Ogle, Winnebago | 6 hr |
| Nov 20, 5:39 AM CST | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 26 more | 3 hr |
| Nov 20, 9:28 PM CST | Dense Fog Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 13 hr |
| Nov 20, 9:38 PM CST | Dense Fog Advisory | LOT | Ford, Grundy, Kankakee, LaSalle, Lee, Livingston and 1 more | 10 hr |
| Nov 20, 9:49 PM CST | Dense Fog Advisory | ILX | Fulton, Knox, McLean, Marshall, Mason, Peoria and 4 more | 11 hr |
| Nov 23, 7:07 AM CST | Dense Fog Advisory | LOT | Boone, DeKalb, Grundy, Kane, Kendall, LaSalle and 5 more | 3 hr |
| Nov 23, 9:40 PM CST | Dense Fog Advisory | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 11 hr |
| Nov 24, 3:56 AM CST | Dense Fog Advisory | DVN | Bureau, Carroll, Henry, Jo Daviess, Putnam, Rock Island and 2 more | 5 hr |
| Dec 14, 3:24 AM CST | Dense Fog Advisory | ILX | Knox, Stark | 6 hr |
| Dec 14, 3:32 AM CST | Dense Fog Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 8 hr |
| Dec 14, 3:57 AM CST | Dense Fog Advisory | LOT | Boone, DeKalb, Kane, Lake, LaSalle, Lee and 3 more | 9 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lee County17
- Ogle County17
- LaSalle County16
- DeKalb County16
- Kane County16
- Boone County15
- Lake County15
- McHenry County15
- Grundy County14
- DuPage County14
- Winnebago County14
- Livingston County13
- Bureau County12
- Putnam County12
- Kendall County12
- Rock Island County11
- Ford County11
- Henry County10
- Mercer County10
- Whiteside County10
- McLean County10
- Henderson County9
- Coles County9
- DeWitt County9
- Peoria County9
- Shelby County9
- Tazewell County9
- Woodford County9
- Iroquois County9
- Kankakee County9
- Carroll County9
- Jo Daviess County9
- Stephenson County9
- Hancock County8
- McDonough County8
- Warren County8
- Champaign County8
- Christian County8
- Clark County8
- Cumberland County8
60 more counties
- Edgar County8
- Fulton County8
- Macon County8
- Mason County8
- Moultrie County8
- Piatt County8
- Stark County8
- Vermilion County8
- Douglas County7
- Knox County7
- Logan County7
- Marshall County7
- Menard County7
- Sangamon County7
- Schuyler County7
- Cass County6
- Morgan County6
- Scott County6
- Clay County6
- Crawford County6
- Effingham County6
- Jasper County6
- Lawrence County6
- Richland County6
- Alexander County5
- Massac County5
- Pope County5
- Pulaski County5
- Adams County4
- Brown County4
- Pike County4
- Hardin County4
- Jackson County4
- Johnson County4
- Union County4
- Williamson County4
- Bond County3
- Clinton County3
- Fayette County3
- Macoupin County3
- Marion County3
- Montgomery County3
- Edwards County3
- Franklin County3
- Gallatin County3
- Hamilton County3
- Jefferson County3
- Saline County3
- Wabash County3
- Wayne County3
- White County3
- Perry County3
- Calhoun County2
- Greene County2
- Jersey County2
- Washington County2
- Madison County1
- Monroe County1
- Randolph County1
- Saint Clair County1
The busiest days
Days with the most alerts issued, by UTC date.
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.