Alert archive / Illinois / Mason County

Weather alerts in Mason County, Illinois, 2024

126 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Mason County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts
126
Warnings
39
Watches
23
Advisories
25
Busiest month
July31 alerts
Busiest day
July 16, 202410 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

0 of 1 tornado warnings covering Mason County in 2024 had a tornado report inside them.

Mason County, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings22864%786%17 min
Flash flood warnings4250%0

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Lincoln, IL: tornado warnings35294%3116%22 min
NWS Lincoln, IL: severe thunderstorm warnings2189357%45975%22 min
NWS Lincoln, IL: flash flood warnings26773%2681%118 min

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

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.

IssuedProductOfficeLasted
Jan 7, 2:58 AM CSTWinter Storm WatchILX24 hr
Jan 8, 2:39 AM CSTWinter Weather AdvisoryILX48 hr
Jan 11, 2:52 AM CSTWinter Weather AdvisoryILX48 hr
Jan 12, 2:27 PM CSTWind Chill WatchILX23 hr
Jan 13, 2:55 AM CSTWind Chill WarningILX3 days
Jan 13, 2:55 AM CSTWind Chill AdvisoryILX4 days
Jan 18, 2:25 AM CSTWinter Weather AdvisoryILX28 hr
Jan 18, 2:23 PM CSTWind Chill AdvisoryILX46 hr
Jan 20, 2:44 AM CSTWind Chill AdvisoryILX31 hr
Jan 21, 3:00 AM CSTWinter Weather AdvisoryILX54 hr
Jan 22, 3:27 AM CSTMesoscale DiscussionSPC5 hr
Jan 23, 2:26 PM CSTDense Fog AdvisoryILX70 hr
Jan 24, 6:58 AM CSTRiver Flood WarningILX26 days
Jan 24, 7:38 PM CSTRiver Flood WarningILX6 days
Jan 25, 10:00 AM CSTRiver Flood WarningILX45 hr
Jan 26, 1:24 PM CSTDense Fog AdvisoryILX26 hr
Feb 6, 4:05 AM CSTDense Fog AdvisoryILX9 hr
Feb 6, 9:26 PM CSTDense Fog AdvisoryILX10 hr
Feb 15, 1:32 PM CSTWinter Weather AdvisoryILX28 hr
Feb 25, 1:25 PM CSTFire Weather WatchILX13 hr
Feb 26, 2:03 AM CSTRed Flag WarningILX16 hr
Mar 3, 2:29 PM CSTWind AdvisoryILX4 hr
Mar 14, 3:15 AM CDTSevere Thunderstorm WatchSPC7 hr
Mar 14, 5:22 AM CDTSevere Thunderstorm WarningILX23 min
Mar 14, 5:35 AM CDTMesoscale DiscussionSPC85 min
Mar 14, 11:13 AM CDTRiver Flood WarningILX12 hr
Mar 14, 1:33 PM CDTTornado WatchSPC7 hr
Mar 14, 3:55 PM CDTMesoscale DiscussionSPC65 min
Mar 24, 2:00 PM CDTWind AdvisoryILX34 hr
Mar 31, 5:26 PM CDTMesoscale DiscussionSPC2 hr
Mar 31, 6:00 PM CDTSevere Thunderstorm WarningILX45 min
Mar 31, 6:28 PM CDTSevere Thunderstorm WarningILX32 min
Apr 1, 10:24 AM CDTFlood WatchILX20 hr
Apr 1, 12:35 PM CDTMesoscale DiscussionSPC115 min
Apr 3, 1:56 AM CDTWind AdvisoryILX17 hr
Apr 3, 12:00 PM CDTRiver Flood WarningILX55 days
Apr 5, 2:13 AM CDTFreeze WarningILX30 hr
Apr 16, 12:06 PM CDTTornado WatchSPC10 hr
Apr 16, 1:56 PM CDTMesoscale DiscussionSPC64 min
Apr 16, 7:32 PM CDTMesoscale DiscussionSPC88 min
Apr 20, 2:25 PM CDTFreeze WarningILX18 hr
Apr 21, 2:32 AM CDTFrost AdvisoryILX29 hr
Apr 27, 2:04 PM CDTFlood WatchILX16 hr
Apr 27, 7:58 PM CDTMesoscale DiscussionSPC62 min
Apr 27, 9:15 PM CDTMesoscale DiscussionSPC60 min
Apr 27, 9:41 PM CDTTornado WatchSPC6 hr
Apr 29, 7:51 PM CDTRiver Flood WarningILX38 hr
May 2, 7:11 PM CDTSpecial Weather StatementILX34 min
May 4, 1:56 PM CDTMesoscale DiscussionSPC94 min
May 4, 4:36 PM CDTSevere Thunderstorm WarningILX24 min
May 7, 12:53 AM CDTTornado WatchSPC7 hr
May 7, 4:42 AM CDTMesoscale DiscussionSPC2 hr
May 7, 4:50 AM CDTSevere Thunderstorm WarningILX40 min
May 17, 2:42 AM CDTDense Fog AdvisoryILX6 hr
May 19, 3:42 PM CDTSpecial Weather StatementILX18 min
May 21, 5:56 PM CDTTornado WatchSPC6 hr
May 24, 2:39 PM CDTSevere Thunderstorm WatchSPC10 hr
May 24, 3:57 PM CDTMesoscale DiscussionSPC93 min
May 24, 8:21 PM CDTSevere Thunderstorm Warning Considerable damage threatILX39 min
May 27, 5:10 PM CDTMesoscale DiscussionSPC2 hr
May 27, 9:17 PM CDTSpecial Weather StatementILX13 min
May 27, 9:27 PM CDTSpecial Weather StatementILX18 min
May 27, 9:41 PM CDTSpecial Weather StatementILX19 min
Jun 13, 2:02 PM CDTMesoscale DiscussionSPC118 min
Jun 13, 2:59 PM CDTSevere Thunderstorm WatchSPC10 hr
Jun 13, 6:16 PM CDTSevere Thunderstorm WarningILX44 min
Jun 13, 6:57 PM CDTSevere Thunderstorm WarningILX48 min
Jun 13, 7:48 PM CDTMesoscale DiscussionSPC87 min
Jun 22, 6:55 PM CDTMesoscale DiscussionSPC2 hr
Jun 22, 7:36 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 25, 10:55 AM CDTSevere Thunderstorm WarningILX18 min
Jun 25, 11:26 AM CDTSevere Thunderstorm WarningILX34 min
Jun 25, 11:43 AM CDTMesoscale DiscussionSPC92 min
Jun 25, 11:57 AM CDTSpecial Weather StatementILX33 min
Jun 25, 12:01 PM CDTSevere Thunderstorm WarningILX29 min
Jun 25, 12:06 PM CDTSevere Thunderstorm WarningILX13 min
Jun 25, 9:15 PM CDTSevere Thunderstorm WarningILX45 min
Jun 25, 10:01 PM CDTSpecial Weather StatementILX29 min
Jul 2, 6:27 PM CDTMesoscale DiscussionSPC2 hr
Jul 2, 10:35 PM CDTSevere Thunderstorm WarningILX14 min
Jul 13, 2:51 PM CDTHeat AdvisoryILX53 hr
Jul 15, 12:54 AM CDTMesoscale DiscussionSPC2 hr
Jul 15, 1:28 AM CDTTornado WarningILX7 min
Jul 15, 2:47 PM CDTFlood WatchILX16 hr
Jul 15, 3:18 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 15, 6:06 PM CDTMesoscale DiscussionSPC114 min
Jul 15, 6:53 PM CDTTornado WatchSPC6 hr
Jul 15, 8:26 PM CDTMesoscale DiscussionSPC2 hr
Jul 15, 8:27 PM CDTSevere Thunderstorm Warning Considerable damage threatILX63 min
Jul 15, 8:37 PM CDTSevere Thunderstorm WarningILX38 min
Jul 15, 9:20 PM CDTSpecial Weather StatementILX40 min
Jul 15, 10:33 PM CDTFlash Flood WarningILX3 hr
Jul 15, 10:36 PM CDTSpecial Weather StatementILX24 min
Jul 15, 11:08 PM CDTFlash Flood WarningILX5 hr
Jul 15, 11:12 PM CDTSpecial Weather StatementILX18 min
Jul 16, 1:05 AM CDTFlash Flood WarningILX3 hr
Jul 16, 1:27 AM CDTFlash Flood Warning Considerable damage threatILX8 hr
Jul 24, 1:06 PM CDTMesoscale DiscussionSPC114 min
Jul 29, 1:29 AM CDTFlood WatchILX6 hr
Jul 30, 12:53 AM CDTDense Fog AdvisoryILX7 hr
Jul 30, 5:43 AM CDTMesoscale DiscussionSPC92 min
Jul 30, 6:14 AM CDTSevere Thunderstorm WatchSPC5 hr
Jul 30, 6:40 AM CDTSevere Thunderstorm WarningILX35 min
Jul 30, 7:02 AM CDTSevere Thunderstorm WarningILX43 min
Jul 30, 1:34 PM CDTSpecial Weather StatementILX26 min
Jul 31, 5:30 AM CDTMesoscale DiscussionSPC2 hr
Jul 31, 5:50 AM CDTSevere Thunderstorm WatchSPC6 hr
Jul 31, 6:45 AM CDTSevere Thunderstorm WarningILX45 min
Jul 31, 7:29 AM CDTSevere Thunderstorm WarningILX35 min
Aug 1, 2:18 AM CDTSpecial Weather StatementILX27 min
Aug 1, 2:45 AM CDTSevere Thunderstorm WarningILX45 min
Aug 1, 3:07 AM CDTSevere Thunderstorm WarningILX38 min
Aug 15, 9:08 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 15, 11:34 PM CDTMesoscale DiscussionSPC86 min
Aug 16, 1:12 AM CDTSpecial Weather StatementILX18 min
Aug 16, 1:19 AM CDTMesoscale DiscussionSPC116 min
Aug 25, 2:27 AM CDTExcessive Heat WatchILX35 hr
Aug 25, 2:27 AM CDTHeat AdvisoryILX42 hr
Aug 26, 1:55 PM CDTExcessive Heat WarningILX30 hr
Oct 14, 1:55 PM CDTFreeze WarningILX42 hr
Oct 28, 2:41 PM CDTFire Weather WatchILX12 hr
Nov 18, 3:32 AM CSTWind AdvisoryILX26 hr
Nov 21, 3:02 AM CSTWind AdvisoryILX18 hr
Dec 4, 2:18 AM CSTWind AdvisoryILX23 hr
Dec 15, 12:09 AM CSTDense Fog AdvisoryILX11 hr
Dec 28, 5:52 AM CSTDense Fog AdvisoryILX3 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20232025

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.