Alert archive / Illinois / 2021
Weather alerts in Illinois, April 2021
133 weather alerts in April 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in April 2021. Tap one for its archive.
- Alerts
- 133
- Warnings
- 48
- Watches
- 11
- Advisories
- 27
- Busiest day
- April 11, 202113 alerts
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 |
|---|---|---|---|---|
| Apr 2, 2:51 AM CDT | Small Craft Advisory | LOT | 40 hr | |
| Apr 2, 2:15 PM CDT | Frost Advisory | PAH | Alexander, Franklin, Jackson, Jefferson, Johnson, Massac and 4 more | 19 hr |
| Apr 2, 2:15 PM CDT | Freeze Warning | PAH | Edwards, Gallatin, Hamilton, Hardin, Pope, Saline and 3 more | 19 hr |
| Apr 2, 2:24 PM CDT | Freeze Warning | ILX | Clay, Crawford, Effingham, Jasper, Lawrence, Richland | 18 hr |
| Apr 2, 2:44 PM CDT | Frost Advisory | LSX | Randolph | 18 hr |
| Apr 4, 11:36 PM CDT | Special Weather Statement | DVN | Jo Daviess | 39 min |
| Apr 5, 12:26 AM CDT | Special Weather Statement | DVN | Jo Daviess | 34 min |
| Apr 5, 1:11 AM CDT | Special Weather Statement | DVN | Jo Daviess | 34 min |
| Apr 5, 1:54 AM CDT | Special Weather Statement | DVN | Carroll | 36 min |
| Apr 5, 4:25 AM CDT | Special Weather Statement | LOT | Cook, DuPage | 50 min |
| Apr 5, 4:29 AM CDT | Special Marine Warning | LOT | 67 min | |
| Apr 5, 6:04 AM CDT | Special Weather Statement | LOT | Kendall | 41 min |
| Apr 7, 1:48 PM CDT | Special Weather Statement | LOT | Livingston | 27 min |
| Apr 7, 2:19 PM CDT | Special Weather Statement | LOT | Grundy, Kendall | 26 min |
| Apr 7, 2:45 PM CDT | Special Weather Statement | LOT | Kendall, Will | 45 min |
| Apr 7, 2:53 PM CDT | Special Weather Statement | LOT | DuPage, Kendall, Will | 52 min |
| Apr 7, 3:20 PM CDT | Special Weather Statement | LOT | Cook, DuPage, Kane, Lake, McHenry, Will | 40 min |
| Apr 7, 5:04 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 13 more | 116 min |
| Apr 7, 5:09 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 19 min |
| Apr 7, 6:27 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Monroe, Saint Clair | 49 min |
| Apr 7, 6:28 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, McDonough | 47 min |
| Apr 7, 6:34 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Schuyler | 45 min |
| Apr 7, 6:38 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 17 min |
| Apr 7, 7:04 PM CDT | Special Weather Statement | DVN | Henderson | 41 min |
| Apr 7, 7:13 PM CDT | Special Weather Statement | ILX | Morgan, Scott | 47 min |
| Apr 7, 7:20 PM CDT | Special Weather Statement | DVN | McDonough, Warren | 25 min |
| Apr 7, 7:26 PM CDT | Special Weather Statement | DVN | Mercer | 34 min |
| Apr 7, 7:49 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Menard, Morgan, Sangamon | 41 min |
| Apr 7, 8:10 PM CDT | Special Weather Statement | DVN | Henry, Rock Island | 65 min |
| Apr 7, 8:27 PM CDT | Special Weather Statement | ILX | Logan | 48 min |
| Apr 7, 9:13 PM CDT | Special Weather Statement | DVN | Carroll, Jo Daviess | 62 min |
| Apr 7, 9:17 PM CDT | Special Weather Statement | DVN | Bureau, Putnam, Whiteside | 58 min |
| Apr 9, 3:12 AM CDT | Small Craft Advisory | LOT | 16 hr | |
| Apr 9, 2:52 PM CDT | Small Craft Advisory | LOT | 31 hr | |
| Apr 9, 3:22 PM CDT | Special Weather Statement | PAH | Jackson | 38 min |
| Apr 9, 4:36 PM CDT | Special Weather Statement | PAH | Williamson | 39 min |
| Apr 9, 4:56 PM CDT | Mesoscale Discussion | SPC | Alexander, Clay, Edwards, Franklin, Gallatin, Hamilton and 19 more | 64 min |
| Apr 9, 5:04 PM CDT | Special Weather Statement | PAH | Franklin | 41 min |
| Apr 9, 5:20 PM CDT | Special Weather Statement | PAH | Franklin | 40 min |
| Apr 9, 5:24 PM CDT | Special Weather Statement | PAH | Jackson | 36 min |
| Apr 9, 5:36 PM CDT | Areal Flood Advisory | PAH | Franklin, Jackson, Perry, Williamson | 3 hr |
| Apr 9, 6:42 PM CDT | Special Weather Statement | PAH | Jefferson, Perry | 48 min |
| Apr 9, 6:57 PM CDT | Special Weather Statement | PAH | Jackson | 33 min |
| Apr 9, 7:12 PM CDT | Special Weather Statement | ILX | Crawford | 18 min |
| Apr 9, 7:26 PM CDT | Severe Thunderstorm Warning | LSX | Randolph, Saint Clair, Washington | 49 min |
| Apr 9, 7:36 PM CDT | Special Weather Statement | ILX | Clay | 24 min |
| Apr 9, 8:04 PM CDT | Special Weather Statement | ILX | Richland | 26 min |
| Apr 9, 8:26 PM CDT | Special Weather Statement | ILX | Crawford | 19 min |
| Apr 10, 9:53 AM CDT | Wind Advisory | DVN | Hancock, Henderson, Henry, McDonough, Mercer, Rock Island and 1 more | 14 hr |
| Apr 10, 10:09 AM CDT | Wind Advisory | LSX | Adams, Bond, Brown, Calhoun, Greene, Jersey and 4 more | 14 hr |
| Apr 10, 10:17 AM CDT | Wind Advisory | ILX | Cass, Christian, Fulton, Knox, Morgan, Sangamon and 2 more | 14 hr |
| Apr 10, 10:27 AM CDT | River Flood Warning | DVN | Hancock, McDonough | 4 days |
| Apr 10, 12:23 PM CDT | Special Weather Statement | ILX | Christian, Logan, Shelby | 37 min |
| Apr 10, 2:26 PM CDT | River Flood Warning | LSX | Brown | 6 days |
| Apr 10, 2:34 PM CDT | River Flood Advisory | LOT | Winnebago | 44 hr |
| Apr 10, 7:58 PM CDT | River Flood Warning | DVN | Henry | 33 hr |
| Apr 10, 8:21 PM CDT | River Flood Warning | DVN | Henry, Rock Island | 38 hr |
| Apr 10, 9:36 PM CDT | River Flood Warning | LSX | Pike | 5 days |
| Apr 10, 9:36 PM CDT | River Flood Warning | LSX | Calhoun | 5 days |
| Apr 10, 9:36 PM CDT | River Flood Warning | LSX | Pike | 4 days |
| Apr 10, 9:42 PM CDT | River Flood Warning | ILX | Fulton, Knox | 3 days |
| Apr 11, 7:29 AM CDT | River Flood Warning | ILX | Fulton | 3 days |
| Apr 11, 10:58 AM CDT | River Flood Warning | LSX | Pike | 66 hr |
| Apr 11, 10:58 AM CDT | River Flood Warning | LSX | Calhoun | 4 days |
| Apr 11, 11:33 AM CDT | Areal Flood Advisory | ILX | Fulton, Knox | 4 hr |
| Apr 11, 11:34 AM CDT | Areal Flood Warning | DVN | Henderson, Henry, Mercer, Rock Island, Warren | 6 hr |
| Apr 11, 1:04 PM CDT | River Flood Warning | PAH | Alexander, Jackson, Union | 6 days |
| Apr 11, 1:04 PM CDT | River Flood Warning | PAH | Alexander | 5 days |
| Apr 11, 8:44 PM CDT | River Flood Warning | DVN | Hancock | 14 hr |
| Apr 11, 8:58 PM CDT | River Flood Warning | LSX | Calhoun, Greene, Jersey | 4 days |
| Apr 11, 9:13 PM CDT | River Flood Warning | LSX | Madison | 4 days |
| Apr 11, 9:13 PM CDT | River Flood Warning | LSX | Adams | 14 hr |
| Apr 11, 9:13 PM CDT | River Flood Warning | LSX | Jackson, Randolph | 6 days |
| Apr 11, 9:13 PM CDT | River Flood Warning | LSX | Jersey | 4 days |
| Apr 12, 11:03 AM CDT | River Flood Watch | DVN | Henderson | 5 hr |
| Apr 13, 2:47 PM CDT | Frost Advisory | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 3 more | 17 hr |
| Apr 13, 2:59 PM CDT | Frost Advisory | ILX | Fulton, Knox, Marshall, Peoria, Stark | 17 hr |
| Apr 14, 8:29 AM CDT | River Flood Warning | ILX | Brown, Cass, Morgan, Schuyler | 56 hr |
| Apr 14, 2:32 PM CDT | Frost Advisory | LSX | Adams, Brown, Calhoun, Greene, Pike | 17 hr |
| Apr 14, 2:36 PM CDT | Frost Advisory | ILX | Cass, Champaign, DeWitt, Fulton, Knox, Logan and 15 more | 17 hr |
| Apr 14, 2:45 PM CDT | Frost Advisory | DVN | Hancock, Henderson, McDonough, Mercer, Warren | 17 hr |
| Apr 14, 2:46 PM CDT | Small Craft Advisory | LOT | 28 hr | |
| Apr 18, 2:42 PM CDT | Freeze Watch | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 22 hr |
| Apr 19, 2:27 AM CDT | Freeze Watch | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 12 hr |
| Apr 19, 3:41 AM CDT | Freeze Watch | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 10 hr |
| Apr 19, 3:45 AM CDT | Freeze Watch | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 11 hr |
| Apr 19, 4:08 AM CDT | Freeze Watch | PAH | Edwards, Franklin, Hamilton, Jackson, Jefferson, Perry and 6 more | 11 hr |
| Apr 19, 1:01 PM CDT | Freeze Warning | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 23 hr |
| Apr 19, 2:07 PM CDT | Freeze Warning | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 43 hr |
| Apr 19, 2:27 PM CDT | Freeze Warning | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 43 hr |
| Apr 19, 2:58 PM CDT | Freeze Warning | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 42 hr |
| Apr 19, 3:25 PM CDT | Freeze Warning | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 42 hr |
| Apr 19, 11:02 PM CDT | Freeze Warning | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 34 hr |
| Apr 19, 11:47 PM CDT | Frost Advisory | DVN | Carroll, Jo Daviess, Stephenson | 8 hr |
| Apr 21, 2:58 AM CDT | Freeze Warning | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 29 hr |
| Apr 21, 3:07 AM CDT | Freeze Warning | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 30 hr |
| Apr 21, 3:08 AM CDT | Freeze Warning | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 30 hr |
| Apr 21, 3:22 AM CDT | Freeze Warning | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 29 hr |
| Apr 21, 4:00 AM CDT | Frost Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 28 hr |
| Apr 24, 3:54 AM CDT | Small Craft Advisory | LOT | 39 hr | |
| Apr 24, 2:25 PM CDT | Frost Advisory | DVN | Carroll, Jo Daviess, Stephenson, Whiteside | 18 hr |
| Apr 25, 2:43 AM CDT | Dense Fog Advisory | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 6 hr |
| Apr 25, 9:52 PM CDT | Small Craft Advisory | LOT | 45 hr | |
| Apr 27, 2:28 PM CDT | Flash Flood Watch | LSX | Clinton, Marion, Monroe, Randolph, Saint Clair, Washington | 39 hr |
| Apr 27, 3:11 PM CDT | Flash Flood Watch | PAH | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 45 hr |
| Apr 28, 2:37 AM CDT | Flash Flood Watch | ILX | Clay, Lawrence, Richland | 28 hr |
| Apr 28, 12:33 PM CDT | Mesoscale Discussion | SPC | Alexander, Johnson, Massac, Pulaski, Union, Williamson | 57 min |
| Apr 28, 12:40 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 7 hr |
| Apr 28, 3:29 PM CDT | Mesoscale Discussion | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 91 min |
| Apr 28, 4:03 PM CDT | Special Weather Statement | PAH | Union | 42 min |
| Apr 28, 4:10 PM CDT | Severe Thunderstorm Warning | PAH | Alexander, Pulaski | 30 min |
| Apr 28, 4:55 PM CDT | Areal Flood Advisory | PAH | Alexander, Pulaski | 59 min |
| Apr 28, 5:18 PM CDT | Special Weather Statement | PAH | Massac | 42 min |
| Apr 28, 5:25 PM CDT | Mesoscale Discussion | SPC | Hardin, Massac, Pope | 2 hr |
| Apr 28, 5:45 PM CDT | Special Weather Statement | DVN | Henderson, Warren | 45 min |
| Apr 28, 6:05 PM CDT | Areal Flood Advisory | PAH | Massac, Pope | 93 min |
| Apr 28, 7:40 PM CDT | Tornado Warning | ILX | Douglas | 9 min |
| Apr 29, 2:27 AM CDT | Flash Flood Warning | LSX | Monroe | 4 hr |
| Apr 29, 3:14 AM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Johnson, Massac, Pope and 4 more | 3 hr |
| Apr 29, 2:00 PM CDT | Gale Watch | LOT | 25 hr | |
| Apr 29, 2:47 PM CDT | Small Craft Advisory | LOT | 28 hr | |
| Apr 29, 4:58 PM CDT | Special Weather Statement | DVN | Stephenson | 32 min |
| Apr 29, 5:06 PM CDT | Special Weather Statement | LOT | Boone, Lee, Ogle, Winnebago | 54 min |
| Apr 29, 5:40 PM CDT | Special Weather Statement | DVN | Bureau, Henry, Putnam | 50 min |
| Apr 29, 5:52 PM CDT | Special Weather Statement | ILX | Knox, Peoria, Stark | 38 min |
| Apr 29, 6:01 PM CDT | Special Weather Statement | LOT | DeKalb, DuPage, Grundy, Kane, Kendall, Lake and 2 more | 59 min |
| Apr 29, 6:26 PM CDT | Special Marine Warning | LOT | 105 min | |
| Apr 29, 6:37 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Kendall, Will | 38 min |
| Apr 29, 6:44 PM CDT | Special Weather Statement | LOT | Cook, DuPage, Lake | 46 min |
| Apr 29, 7:01 PM CDT | Special Weather Statement | LOT | Ford, Grundy, Kankakee, Livingston, Will | 59 min |
| Apr 29, 7:15 PM CDT | Special Marine Warning | LOT | 90 min | |
| Apr 30, 2:50 PM CDT | Wind Advisory | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more | 28 hr |
| Apr 30, 3:06 PM CDT | Gale Warning | LOT | 31 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 9 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 41 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 1 |
| River Flood Warning | 20 |
| Flash Flood Watch | 3 |
| River Flood Watch | 1 |
| Areal Flood Advisory | 4 |
| River Flood Advisory | 1 |
| Cold | |
| Freeze Warning | 12 |
| Freeze Watch | 5 |
| Frost Advisory | 10 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
| Marine | |
| Gale Warning | 1 |
| Special Marine Warning | 3 |
| Gale Watch | 1 |
| Small Craft Advisory | 7 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Alexander County14
- Jackson County13
- Massac County13
- Union County13
- Pulaski County12
- Williamson County11
- Pope County11
- Henderson County11
- Pike County11
- Franklin County10
- Johnson County10
- Hardin County10
- DuPage County10
- Kendall County10
- Brown County10
- Calhoun County10
- Fulton County10
- Hancock County10
- McDonough County10
- Warren County10
- Henry County10
- Perry County9
- Randolph County9
- Jo Daviess County9
- Will County9
- Adams County9
- Cass County9
- Morgan County9
- Knox County9
- Jefferson County8
- Saline County8
- Cook County8
- Greene County8
- Jersey County8
- Madison County8
- Monroe County8
- Saint Clair County8
- Schuyler County8
- Mercer County8
- Rock Island County8
62 more counties
- Edwards County7
- Gallatin County7
- Hamilton County7
- Wabash County7
- Wayne County7
- White County7
- Clay County7
- Richland County7
- Carroll County7
- Grundy County7
- Kane County7
- Lake County7
- Scott County7
- Washington County7
- Crawford County6
- Lawrence County6
- McHenry County6
- Macoupin County6
- Sangamon County6
- Logan County6
- Bureau County6
- Putnam County6
- Marion County6
- Winnebago County6
- Peoria County6
- Stark County6
- Stephenson County6
- Livingston County5
- Menard County5
- Whiteside County5
- Bond County5
- Montgomery County5
- Christian County5
- Marshall County5
- Clinton County5
- Boone County5
- DeKalb County5
- Kankakee County5
- LaSalle County5
- Lee County5
- Ogle County5
- Effingham County4
- Jasper County4
- Shelby County4
- Champaign County4
- DeWitt County4
- McLean County4
- Macon County4
- Mason County4
- Piatt County4
- Tazewell County4
- Vermilion County4
- Woodford County4
- Fayette County4
- Douglas County4
- Ford County4
- Clark County3
- Coles County3
- Cumberland County3
- Edgar County3
- Moultrie County3
- Iroquois County3
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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. Rebuilt daily.