Alert archive / Illinois / Mason County

Weather alerts in Mason County, Illinois, 2011

142 weather alerts in 2011, 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 2011. Tap one for its archive.

Alerts
142
Warnings
42
Watches
25
Advisories
25
Busiest month
June38 alerts
Busiest day
June 27, 201110 alerts

Over time

By month

Warning verification

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

1 of 5 tornado warnings covering Mason County in 2011 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 28 minutes after it went out.

Mason County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings5180%1100%28 min
Severe thunderstorm warnings201240%683%10 min
Flash flood warnings60100%0

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Lincoln, IL: tornado warnings581083%2471%14 min
NWS Lincoln, IL: severe thunderstorm warnings24110756%39464%20 min
NWS Lincoln, IL: flash flood warnings692170%6182%150 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 10, 3:30 AM CSTWinter Weather AdvisoryILX48 hr
Jan 17, 7:35 AM CSTWinter Weather AdvisoryILX7 hr
Jan 18, 3:02 PM CSTWinter Weather AdvisoryILX48 hr
Jan 23, 10:47 PM CSTFreezing Rain AdvisoryILX10 hr
Jan 30, 4:12 AM CSTWinter Storm WatchILX33 hr
Jan 30, 9:08 PM CSTWinter Weather AdvisoryILX31 hr
Jan 31, 11:52 AM CSTMesoscale DiscussionSPC4 hr
Jan 31, 1:24 PM CSTBlizzard WarningILX47 hr
Feb 1, 10:36 AM CSTMesoscale DiscussionSPC6 hr
Feb 1, 3:36 PM CSTMesoscale DiscussionSPC6 hr
Feb 2, 4:00 AM CSTWind Chill AdvisoryILX30 hr
Feb 8, 3:51 AM CSTWind Chill AdvisoryILX8 hr
Feb 18, 7:50 PM CSTRiver Flood WarningILX40 days
Feb 24, 3:41 AM CSTWinter Storm WarningILX24 hr
Feb 24, 3:41 AM CSTWinter Weather AdvisoryILX26 hr
Feb 24, 5:20 PM CSTMesoscale DiscussionSPC6 hr
Feb 27, 11:46 AM CSTSevere Thunderstorm WarningILX44 min
Feb 27, 5:33 PM CSTSevere Thunderstorm WatchSPC4 hr
Feb 27, 7:19 PM CSTSevere Thunderstorm WarningILX41 min
Feb 27, 7:40 PM CSTSpecial Weather StatementILX50 min
Feb 27, 8:25 PM CSTSevere Thunderstorm WarningILX35 min
Apr 2, 3:30 PM CDTWind AdvisoryILX28 hr
Apr 3, 8:11 PM CDTSevere Thunderstorm WatchSPC6 hr
Apr 3, 10:50 PM CDTMesoscale DiscussionSPC85 min
Apr 4, 12:25 AM CDTSpecial Weather StatementILX50 min
Apr 4, 12:41 AM CDTSevere Thunderstorm WarningILX49 min
Apr 4, 1:29 AM CDTMesoscale DiscussionSPC91 min
Apr 7, 11:52 PM CDTSpecial Weather StatementILX53 min
Apr 10, 6:05 PM CDTTornado WatchSPC7 hr
Apr 10, 9:55 PM CDTSpecial Weather StatementILX50 min
Apr 10, 10:31 PM CDTSevere Thunderstorm WarningILX44 min
Apr 15, 9:36 AM CDTWind AdvisoryILX4 hr
Apr 15, 4:27 PM CDTSevere Thunderstorm WarningILX48 min
Apr 15, 5:06 PM CDTTornado WarningILX39 min
Apr 15, 5:40 PM CDTTornado WarningILX50 min
Apr 15, 5:52 PM CDTTornado WarningILX17 min
Apr 15, 5:57 PM CDTMesoscale DiscussionSPC2 hr
Apr 15, 6:27 PM CDTTornado WarningILX48 min
Apr 15, 7:17 PM CDTFlash Flood WarningILX5 hr
Apr 19, 5:52 AM CDTMesoscale DiscussionSPC83 min
Apr 19, 12:55 PM CDTRiver Flood WarningILX84 days
Apr 19, 1:00 PM CDTTornado WatchSPC10 hr
Apr 19, 4:37 PM CDTSevere Thunderstorm WarningILX38 min
Apr 22, 7:31 PM CDTMesoscale DiscussionSPC59 min
Apr 23, 11:43 AM CDTRiver Flood WarningILX9 days
May 3, 2:55 AM CDTFrost AdvisoryILX29 hr
May 11, 1:23 PM CDTSevere Thunderstorm WatchSPC6 hr
May 11, 2:18 PM CDTMesoscale DiscussionSPC57 min
May 11, 3:38 PM CDTMesoscale DiscussionSPC2 hr
May 11, 4:24 PM CDTSpecial Weather StatementILX66 min
May 11, 4:48 PM CDTSevere Thunderstorm WarningILX57 min
May 13, 4:40 PM CDTMesoscale DiscussionSPC95 min
May 22, 4:41 AM CDTMesoscale DiscussionSPC2 hr
May 22, 12:51 PM CDTTornado WatchSPC10 hr
May 22, 1:11 PM CDTSevere Thunderstorm WarningILX34 min
May 22, 1:35 PM CDTSevere Thunderstorm WarningILX55 min
May 22, 6:00 PM CDTSevere Thunderstorm WarningILX30 min
May 22, 8:26 PM CDTTornado WatchSPC8 hr
May 25, 12:48 AM CDTMesoscale DiscussionSPC57 min
May 25, 1:22 AM CDTTornado WatchSPC7 hr
May 25, 4:58 AM CDTMesoscale DiscussionSPC92 min
May 25, 5:47 AM CDTSevere Thunderstorm WarningILX58 min
May 25, 1:20 PM CDTFlash Flood WatchILX10 hr
May 25, 2:31 PM CDTTornado WatchSPC7 hr
May 25, 4:29 PM CDTSevere Thunderstorm WarningILX61 min
May 25, 5:19 PM CDTSevere Thunderstorm WarningILX35 min
May 28, 12:15 PM CDTMesoscale DiscussionSPC90 min
May 31, 12:59 PM CDTMesoscale DiscussionSPC3 hr
Jun 4, 4:47 PM CDTMesoscale DiscussionSPC28 min
Jun 4, 4:53 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 4, 6:24 PM CDTSevere Thunderstorm WarningILX66 min
Jun 4, 6:58 PM CDTSevere Thunderstorm WarningILX62 min
Jun 4, 7:43 PM CDTAreal Flood AdvisoryILX3 hr
Jun 4, 7:55 PM CDTMesoscale DiscussionSPC65 min
Jun 5, 2:52 AM CDTMesoscale DiscussionSPC2 hr
Jun 5, 5:00 AM CDTSevere Thunderstorm WatchSPC7 hr
Jun 9, 5:46 AM CDTMesoscale DiscussionSPC59 min
Jun 9, 4:29 PM CDTMesoscale DiscussionSPC61 min
Jun 10, 5:55 PM CDTMesoscale DiscussionSPC65 min
Jun 10, 6:08 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 10, 7:15 PM CDTTornado WarningILX45 min
Jun 10, 7:27 PM CDTAreal Flood AdvisoryILX6 hr
Jun 13, 3:48 PM CDTFlash Flood WatchILX39 hr
Jun 13, 11:57 PM CDTMesoscale DiscussionSPC93 min
Jun 15, 1:55 AM CDTMesoscale DiscussionSPC3 hr
Jun 15, 1:56 AM CDTFlash Flood WarningILX6 hr
Jun 15, 2:58 AM CDTFlash Flood WarningILX4 hr
Jun 19, 11:42 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 20, 4:08 AM CDTMesoscale DiscussionSPC67 min
Jun 21, 9:46 AM CDTRiver Flood WarningILX48 hr
Jun 21, 11:45 AM CDTMesoscale DiscussionSPC3 hr
Jun 21, 1:22 PM CDTTornado WatchSPC9 hr
Jun 21, 3:31 PM CDTMesoscale DiscussionSPC89 min
Jun 21, 4:56 PM CDTMesoscale DiscussionSPC94 min
Jun 25, 8:42 PM CDTFlash Flood WarningILX6 hr
Jun 26, 7:12 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 26, 10:46 PM CDTSpecial Weather StatementILX59 min
Jun 26, 11:11 PM CDTSevere Thunderstorm WarningILX64 min
Jun 27, 12:58 AM CDTMesoscale DiscussionSPC92 min
Jun 27, 1:32 AM CDTSevere Thunderstorm WatchSPC7 hr
Jun 27, 1:43 AM CDTSevere Thunderstorm WarningILX62 min
Jun 27, 2:15 AM CDTFlash Flood WarningILX5 hr
Jun 27, 2:35 AM CDTSevere Thunderstorm WarningILX55 min
Jun 27, 3:16 AM CDTFlash Flood WarningILX6 hr
Jun 27, 9:35 AM CDTRiver Flood WarningILX24 hr
Jun 30, 3:05 AM CDTHeat AdvisoryILX41 hr
Jul 2, 1:06 PM CDTMesoscale DiscussionSPC54 min
Jul 2, 2:50 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 10, 3:02 AM CDTHeat AdvisoryILX40 hr
Jul 10, 2:45 PM CDTMesoscale DiscussionSPC2 hr
Jul 11, 7:10 AM CDTMesoscale DiscussionSPC95 min
Jul 11, 5:16 PM CDTMesoscale DiscussionSPC59 min
Jul 12, 1:00 PM CDTMesoscale DiscussionSPC2 hr
Jul 12, 1:45 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 14, 2:46 PM CDTExcessive Heat WatchILX24 hr
Jul 15, 3:03 PM CDTExcessive Heat WarningILX9 days
Jul 24, 11:21 AM CDTMesoscale DiscussionSPC114 min
Jul 26, 1:11 PM CDTMesoscale DiscussionSPC94 min
Jul 27, 12:12 PM CDTHeat AdvisoryILX7 hr
Jul 27, 2:50 PM CDTHeat AdvisoryILX28 hr
Jul 31, 2:42 PM CDTHeat AdvisoryILX52 hr
Aug 1, 3:20 PM CDTExcessive Heat WarningILX28 hr
Aug 8, 5:23 PM CDTMesoscale DiscussionSPC67 min
Aug 8, 5:38 PM CDTSevere Thunderstorm WatchSPC5 hr
Aug 8, 7:27 PM CDTMesoscale DiscussionSPC93 min
Aug 13, 12:12 PM CDTSevere Thunderstorm WatchSPC9 hr
Aug 13, 3:51 PM CDTSevere Thunderstorm WarningILX35 min
Aug 17, 3:44 PM CDTMesoscale DiscussionSPC91 min
Aug 24, 3:14 AM CDTHeat AdvisoryILX15 hr
Aug 24, 3:46 PM CDTMesoscale DiscussionSPC89 min
Sep 2, 3:42 AM CDTHeat AdvisoryILX14 hr
Sep 3, 3:05 PM CDTSevere Thunderstorm WatchSPC7 hr
Sep 3, 5:02 PM CDTMesoscale DiscussionSPC58 min
Sep 19, 11:28 PM CDTDense Fog AdvisoryILX11 hr
Sep 29, 3:16 AM CDTWind AdvisoryILX16 hr
Oct 1, 3:06 PM CDTFrost AdvisoryILX17 hr
Oct 20, 3:07 AM CDTFreeze WarningILX30 hr
Oct 25, 6:56 PM CDTMesoscale DiscussionSPC3 hr
Oct 25, 9:34 PM CDTSpecial Weather StatementILX56 min
Oct 27, 2:34 PM CDTFrost AdvisoryILX17 hr
Oct 28, 2:50 PM CDTFreeze WarningILX18 hr
Nov 12, 3:32 PM CSTWind AdvisoryILX26 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 archive20102012

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.