Alert archive / Illinois / Washington County

Weather alerts in Washington County, Illinois, 2024

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

Washington County and its neighbors

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

Alerts
104
Warnings
26
Watches
19
Advisories
27
Busiest month
April24 alerts
Busiest day
March 14, 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.

2 of 4 tornado warnings covering Washington County in 2024 had a tornado report inside them.

Washington County, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4250%0
Severe thunderstorm warnings141121%2143%21 min
Flash flood warnings4250%6100%80 min

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS St. Louis, MO: tornado warnings802569%5756%14 min
NWS St. Louis, MO: severe thunderstorm warnings37817853%98564%24 min
NWS St. Louis, MO: flash flood warnings593246%12385%86 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 11, 12:56 PM CSTWind AdvisoryLSX38 hr
Jan 12, 2:07 PM CSTWind Chill AdvisoryLSX5 days
Jan 18, 2:48 AM CSTWind Chill AdvisoryLSX57 hr
Jan 21, 1:53 AM CSTWinter Weather AdvisoryLSX43 hr
Jan 22, 3:27 AM CSTMesoscale DiscussionSPC5 hr
Jan 23, 4:12 PM CSTDense Fog AdvisoryLSX67 hr
Feb 15, 1:06 PM CSTWinter Weather AdvisoryLSX28 hr
Feb 16, 3:04 PM CSTMesoscale DiscussionSPC4 hr
Feb 27, 12:00 AM CSTMesoscale DiscussionSPC2 hr
Feb 27, 5:47 PM CSTMesoscale DiscussionSPC88 min
Feb 27, 7:46 PM CSTMesoscale DiscussionSPC119 min
Feb 27, 9:29 PM CSTTornado WatchSPC10 hr
Feb 27, 11:50 PM CSTMesoscale DiscussionSPC85 min
Mar 13, 3:50 PM CDTSevere Thunderstorm WatchSPC7 hr
Mar 14, 4:41 AM CDTSevere Thunderstorm WatchSPC7 hr
Mar 14, 7:39 AM CDTMesoscale DiscussionSPC2 hr
Mar 14, 12:58 PM CDTMesoscale DiscussionSPC92 min
Mar 14, 1:33 PM CDTTornado WatchSPC7 hr
Mar 14, 3:55 PM CDTMesoscale DiscussionSPC65 min
Mar 14, 4:16 PM CDTSevere Thunderstorm WarningLSX44 min
Mar 14, 5:09 PM CDTMesoscale DiscussionSPC96 min
Mar 14, 5:28 PM CDTTornado WarningLSX47 min
Mar 14, 6:16 PM CDTSevere Thunderstorm WarningLSX27 min
Mar 14, 6:26 PM CDTSevere Thunderstorm WarningLSX64 min
Mar 14, 7:04 PM CDTAreal Flood AdvisoryLSX40 min
Mar 14, 7:06 PM CDTSevere Thunderstorm WarningLSX39 min
Mar 14, 7:20 PM CDTMesoscale DiscussionSPC85 min
Mar 14, 7:44 PM CDTFlash Flood WarningLSX3 hr
Mar 24, 2:18 PM CDTWind AdvisoryLSX29 hr
Apr 1, 12:35 PM CDTMesoscale DiscussionSPC115 min
Apr 1, 4:49 PM CDTTornado WatchSPC7 hr
Apr 1, 6:45 PM CDTMesoscale DiscussionSPC90 min
Apr 1, 10:37 PM CDTTornado WatchSPC4 hr
Apr 1, 11:26 PM CDTMesoscale DiscussionSPC94 min
Apr 2, 1:16 AM CDTMesoscale DiscussionSPC89 min
Apr 2, 1:57 AM CDTSevere Thunderstorm Warning Considerable damage threatLSX48 min
Apr 5, 2:33 AM CDTFreeze WarningLSX29 hr
Apr 7, 2:12 PM CDTMesoscale DiscussionSPC3 hr
Apr 7, 5:33 PM CDTSevere Thunderstorm WarningLSX42 min
Apr 7, 6:15 PM CDTSevere Thunderstorm WarningLSX45 min
Apr 15, 3:45 PM CDTMesoscale DiscussionSPC90 min
Apr 16, 2:48 PM CDTWind AdvisoryLSX6 hr
Apr 16, 3:21 PM CDTSevere Thunderstorm WatchSPC5 hr
Apr 18, 12:08 PM CDTMesoscale DiscussionSPC2 hr
Apr 18, 12:56 PM CDTSevere Thunderstorm WatchSPC8 hr
Apr 18, 3:09 PM CDTMesoscale DiscussionSPC2 hr
Apr 18, 6:10 PM CDTTornado WarningLSX65 min
Apr 18, 6:12 PM CDTMesoscale DiscussionSPC93 min
Apr 18, 6:13 PM CDTSevere Thunderstorm WarningLSX77 min
Apr 18, 7:05 PM CDTTornado WarningLSX55 min
Apr 21, 1:54 PM CDTFrost AdvisoryLSX18 hr
Apr 23, 11:49 PM CDTDense Fog AdvisoryLSX4 hr
Apr 29, 11:04 PM CDTDense Fog AdvisoryLSX10 hr
May 3, 10:07 PM CDTDense Fog AdvisoryLSX8 hr
May 4, 5:35 PM CDTSevere Thunderstorm WarningLSX25 min
May 4, 6:27 PM CDTSevere Thunderstorm WarningLSX48 min
May 7, 12:53 AM CDTTornado WatchSPC7 hr
May 7, 4:42 AM CDTMesoscale DiscussionSPC2 hr
May 8, 10:29 AM CDTTornado WatchSPC8 hr
May 8, 12:58 PM CDTMesoscale DiscussionSPC62 min
May 8, 1:50 PM CDTMesoscale DiscussionSPC55 min
May 8, 6:29 PM CDTSevere Thunderstorm WarningLSX46 min
May 8, 7:14 PM CDTAreal Flood AdvisoryLSX3 hr
May 23, 11:40 AM CDTSevere Thunderstorm WarningLSX25 min
May 24, 2:39 PM CDTSevere Thunderstorm WatchSPC10 hr
May 24, 3:57 PM CDTMesoscale DiscussionSPC93 min
May 25, 2:06 PM CDTFlood WatchLSX32 hr
May 26, 4:01 PM CDTTornado Watch PDSSPC7 hr
May 26, 6:38 PM CDTTornado WarningLSX67 min
May 26, 7:01 PM CDTMesoscale DiscussionSPC89 min
Jun 5, 10:38 AM CDTMesoscale DiscussionSPC3 hr
Jun 24, 2:59 AM CDTHeat AdvisoryLSX40 hr
Jul 3, 2:23 PM CDTFlood WatchLSX37 hr
Jul 4, 5:03 AM CDTAreal Flood AdvisoryLSX45 min
Jul 4, 5:48 AM CDTFlash Flood WarningLSX3 hr
Jul 8, 2:37 AM CDTFlood WatchLSX48 hr
Jul 12, 4:40 PM CDTMesoscale DiscussionSPC95 min
Jul 12, 5:47 PM CDTFlash Flood WarningLSX3 hr
Jul 13, 2:29 PM CDTHeat AdvisoryLSX68 hr
Jul 16, 2:17 AM CDTFlood WatchLSX29 hr
Jul 16, 5:58 AM CDTAreal Flood AdvisoryLSX39 min
Jul 16, 6:37 AM CDTFlash Flood WarningLSX10 hr
Jul 16, 8:45 AM CDTMesoscale DiscussionSPC90 min
Jul 16, 12:02 PM CDTMesoscale DiscussionSPC88 min
Jul 16, 4:43 PM CDTAreal Flood WarningLSX12 hr
Jul 28, 3:27 AM CDTExcessive Heat WarningLSX5 days
Jul 28, 3:27 AM CDTHeat AdvisoryLSX5 days
Jul 29, 7:48 PM CDTSevere Thunderstorm WatchSPC9 hr
Jul 29, 10:33 PM CDTSevere Thunderstorm WarningLSX42 min
Jul 29, 11:50 PM CDTAreal Flood AdvisoryLSX4 hr
Jul 30, 1:56 PM CDTMesoscale DiscussionSPC2 hr
Jul 30, 2:58 PM CDTSevere Thunderstorm WatchSPC8 hr
Aug 1, 11:18 AM CDTMesoscale DiscussionSPC87 min
Aug 5, 2:04 PM CDTHeat AdvisoryLSX28 hr
Aug 25, 2:17 PM CDTHeat AdvisoryLSX5 days
Aug 28, 7:02 PM CDTSevere Thunderstorm WarningLSX43 min
Aug 30, 3:41 PM CDTMesoscale DiscussionSPC3 hr
Sep 27, 3:05 AM CDTWind AdvisoryLSX22 hr
Oct 15, 2:52 AM CDTFrost AdvisoryLSX30 hr
Oct 16, 9:51 AM CDTFreeze WarningLSX23 hr
Nov 4, 10:30 AM CSTAreal Flood AdvisoryLSX6 hr
Nov 4, 1:42 PM CSTAreal Flood AdvisoryLSX6 hr
Nov 4, 7:43 PM CSTFlood WatchLSX16 hr
Nov 29, 2:20 PM CSTWinter Weather AdvisoryLSX32 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.