Alert archive / Illinois / Mesoscale Discussions / 2018

Mesoscale Discussions in Illinois, May 2018

23 mesoscale discussions in May 2018. 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 May 2018. Tap one for its archive.

Mesoscale Discussions
23
Busiest day
May 3, 20185 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.

IssuedProductOfficeCountiesLasted
May 2, 1:33 PM CDTMesoscale DiscussionSPCBureau, Carroll, DeKalb, Fulton, Grundy, Hancock and 23 more117 min
May 2, 5:29 PM CDTMesoscale DiscussionSPCCook91 min
May 2, 7:21 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 24 more84 min
May 2, 10:01 PM CDTMesoscale DiscussionSPCBureau, DeKalb, DuPage, Grundy, Henderson, Henry and 18 more89 min
May 2, 10:20 PM CDTMesoscale DiscussionSPCAdams, Calhoun, Pike115 min
May 3, 1:57 AM CDTMesoscale DiscussionSPCBureau, Cook, DeKalb, DeWitt, DuPage, Ford and 22 more93 min
May 3, 2:32 AM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Macoupin, Madison, Monroe and 3 more88 min
May 4, 3:30 PM CDTMesoscale DiscussionSPCGallatin2 hr
May 9, 1:49 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Carroll, Cass, Fulton and 16 more116 min
May 9, 3:50 PM CDTMesoscale DiscussionSPCBoone, Cook, DeKalb, DeWitt, DuPage, Ford and 19 more85 min
May 10, 6:36 PM CDTMesoscale DiscussionSPCClay, Edwards, Jefferson, Marion, Richland, Wabash and 2 more84 min
May 12, 1:04 AM CDTMesoscale DiscussionSPCRock Island116 min
May 13, 3:43 PM CDTMesoscale DiscussionSPCFulton, Henderson, Knox, Livingston, McDonough, McLean and 9 more2 hr
May 14, 2:40 AM CDTMesoscale DiscussionSPCBoone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 6 more2 hr
May 14, 2:37 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Cass, Champaign, DeWitt and 32 more53 min
May 14, 6:36 PM CDTMesoscale DiscussionSPCBond, Calhoun, Cass, Champaign, Christian, Clinton and 36 more84 min
May 19, 6:14 PM CDTMesoscale DiscussionSPCAlexander, Johnson, Massac, Pulaski, Union61 min
May 20, 11:43 AM CDTMesoscale DiscussionSPCAlexander, Johnson, Massac, Pope, Pulaski, Union3 hr
May 20, 3:32 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more118 min
May 26, 12:59 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, McDonough and 5 more3 hr
May 27, 3:47 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 62 more118 min
May 31, 10:16 AM CDTMesoscale DiscussionSPCClay, Crawford, Edwards, Effingham, Gallatin, Hamilton and 9 more119 min
May 31, 4:42 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more2 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

62 more counties

Nearby

Alerts in force nowTornadoes on recordThe radar archive20172019

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.