Alert archive / Illinois / Winnebago County

Weather alerts in Winnebago County, Illinois, 2023

115 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Winnebago County and its neighbors

Each county as a circle sized by its count in 2023. Tap one for its archive.

Alerts
115
Warnings
36
Watches
19
Advisories
34
Busiest month
April28 alerts
Busiest day
July 29, 20239 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 1 tornado warnings covering Winnebago County in 2023 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 11 minutes after it went out.

Winnebago County, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings110%1100%11 min
Severe thunderstorm warnings191142%1995%25 min
Flash flood warnings20100%0

Each office's whole area, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Chicago, IL: tornado warnings321747%6856%11 min
NWS Chicago, IL: severe thunderstorm warnings16410635%54484%27 min
NWS Chicago, IL: flash flood warnings191047%4290%75 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 1, 5:52 AM CSTDense Fog AdvisoryLOT6 hr
Jan 1, 5:16 PM CSTDense Fog AdvisoryLOT16 hr
Jan 3, 9:35 AM CSTDense Fog AdvisoryLOT16 hr
Jan 19, 8:26 AM CSTDense Fog AdvisoryLOT2 hr
Jan 24, 1:57 AM CSTWinter Weather AdvisoryLOT52 hr
Jan 27, 2:28 PM CSTWinter Weather AdvisoryLOT40 hr
Jan 28, 12:25 PM CSTWinter Storm WarningLOT14 hr
Jan 31, 3:19 PM CSTFlood WatchLOT48 hr
Feb 2, 2:53 AM CSTWind Chill AdvisoryLOT31 hr
Feb 14, 4:03 AM CSTWind AdvisoryLOT34 hr
Feb 14, 1:54 PM CSTWinter Storm WatchLOT24 hr
Feb 15, 2:13 PM CSTWinter Storm WarningLOT34 hr
Feb 16, 8:02 AM CSTMesoscale DiscussionSPC6 hr
Feb 21, 3:00 PM CSTWinter Weather AdvisoryLOT36 hr
Feb 22, 2:04 AM CSTIce Storm WarningLOT25 hr
Feb 22, 8:46 AM CSTMesoscale DiscussionSPC5 hr
Feb 22, 3:27 PM CSTMesoscale DiscussionSPC4 hr
Feb 26, 10:51 PM CSTRiver Flood WatchMKX23 hr
Feb 27, 11:00 AM CSTRiver Flood WatchLOT3 days
Feb 27, 11:00 AM CSTRiver Flood WatchLOT3 days
Feb 27, 11:37 AM CSTRiver Flood WatchLOT3 days
Feb 27, 9:52 PM CSTRiver Flood WarningMKX3 days
Mar 1, 10:23 AM CSTRiver Flood WarningMKX44 hr
Mar 2, 7:35 PM CSTRiver Flood WarningLOT62 hr
Mar 4, 10:24 PM CSTDense Fog AdvisoryLOT11 hr
Mar 8, 3:20 AM CSTWinter Storm WatchLOT12 hr
Mar 8, 2:54 PM CSTWinter Weather AdvisoryLOT40 hr
Mar 24, 3:08 AM CDTWinter Weather AdvisoryLOT30 hr
Mar 24, 2:09 PM CDTWinter Storm WarningLOT22 hr
Mar 25, 3:47 AM CDTMesoscale DiscussionSPC4 hr
Mar 31, 3:06 AM CDTWind AdvisoryLOT37 hr
Mar 31, 2:07 PM CDTMesoscale DiscussionSPC83 min
Mar 31, 2:36 PM CDTTornado WatchSPC7 hr
Mar 31, 3:50 PM CDTMesoscale DiscussionSPC55 min
Mar 31, 6:45 PM CDTSevere Thunderstorm Warning Considerable damage threatLOT75 min
Mar 31, 7:23 PM CDTTornado WarningLOT43 min
Mar 31, 7:54 PM CDTMesoscale DiscussionSPC2 hr
Apr 4, 8:00 AM CDTMesoscale DiscussionSPC3 hr
Apr 4, 12:38 PM CDTSevere Thunderstorm Warning Considerable damage threatLOT52 min
Apr 4, 1:02 PM CDTSevere Thunderstorm WarningLOT43 min
Apr 4, 1:39 PM CDTAreal Flood AdvisoryLOT117 min
Apr 4, 1:44 PM CDTSevere Thunderstorm Warning Considerable damage threatLOT46 min
Apr 5, 1:45 AM CDTRiver Flood WarningMKX21 days
Apr 5, 3:57 AM CDTSevere Thunderstorm WatchSPC8 hr
Apr 5, 5:35 AM CDTSevere Thunderstorm WarningLOT40 min
Apr 11, 3:19 AM CDTFire Weather WatchLOT23 hr
Apr 12, 2:40 AM CDTRed Flag WarningLOT16 hr
Apr 15, 3:11 PM CDTFreeze WatchLOT13 hr
Apr 15, 9:40 PM CDTSpecial Weather StatementLOT65 min
Apr 15, 9:51 PM CDTSevere Thunderstorm WarningLOT54 min
Apr 16, 3:14 PM CDTWind AdvisoryLOT23 hr
Apr 17, 2:43 PM CDTFreeze WarningLOT17 hr
Apr 19, 2:42 PM CDTMesoscale DiscussionSPC2 hr
Apr 20, 1:50 PM CDTMesoscale DiscussionSPC85 min
Apr 20, 2:06 PM CDTTornado WatchSPC6 hr
Apr 20, 3:41 PM CDTMesoscale DiscussionSPC94 min
Apr 20, 5:02 PM CDTSevere Thunderstorm WarningLOT31 min
Apr 20, 5:23 PM CDTMesoscale DiscussionSPC97 min
Apr 22, 1:56 PM CDTFreeze WatchLOT13 hr
Apr 23, 2:56 AM CDTFreeze WarningLOT29 hr
Apr 24, 2:30 PM CDTFreeze WatchLOT23 hr
Apr 25, 1:41 PM CDTFreeze WarningLOT18 hr
Apr 26, 2:28 PM CDTFrost AdvisoryLOT17 hr
May 12, 4:12 PM CDTAreal Flood AdvisoryLOT2 hr
Jun 24, 10:09 PM CDTSevere Thunderstorm WarningLOT51 min
Jun 24, 10:44 PM CDTSevere Thunderstorm WarningLOT31 min
Jun 24, 11:12 PM CDTSevere Thunderstorm Warning Considerable damage threatLOT33 min
Jun 29, 3:14 AM CDTSevere Thunderstorm WarningLOT46 min
Jul 4, 5:21 PM CDTSpecial Weather StatementLOT24 min
Jul 5, 12:49 PM CDTMesoscale DiscussionSPC116 min
Jul 5, 3:04 PM CDTSevere Thunderstorm WarningLOT41 min
Jul 12, 3:05 PM CDTMesoscale DiscussionSPC85 min
Jul 12, 3:53 PM CDTTornado WatchSPC5 hr
Jul 13, 7:04 PM CDTMesoscale DiscussionSPC56 min
Jul 14, 2:38 PM CDTMesoscale DiscussionSPC2 hr
Jul 14, 3:52 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 22, 10:16 PM CDTSpecial Weather StatementLOT44 min
Jul 26, 3:50 AM CDTHeat AdvisoryLOT65 hr
Jul 26, 7:30 AM CDTMesoscale DiscussionSPC90 min
Jul 26, 7:34 AM CDTSevere Thunderstorm Warning Considerable damage threatLOT41 min
Jul 26, 8:04 AM CDTSevere Thunderstorm Warning Considerable damage threatLOT41 min
Jul 28, 2:52 AM CDTMesoscale DiscussionSPC113 min
Jul 28, 7:21 PM CDTMesoscale DiscussionSPC2 hr
Jul 28, 7:30 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 28, 7:36 PM CDTFlood WatchLOT5 hr
Jul 28, 8:10 PM CDTSevere Thunderstorm WarningLOT50 min
Jul 28, 8:30 PM CDTSevere Thunderstorm WarningLOT45 min
Jul 28, 8:41 PM CDTAreal Flood AdvisoryLOT4 hr
Jul 28, 8:56 PM CDTSevere Thunderstorm WarningLOT49 min
Jul 28, 9:16 PM CDTFlash Flood WarningLOT3 hr
Jul 28, 9:28 PM CDTSevere Thunderstorm WarningLOT47 min
Aug 3, 4:18 AM CDTDense Fog AdvisoryLOT5 hr
Aug 9, 3:46 AM CDTDense Fog AdvisoryLOT4 hr
Aug 10, 1:04 AM CDTDense Fog AdvisoryLOT8 hr
Aug 17, 4:41 AM CDTMesoscale DiscussionSPC3 hr
Aug 17, 5:02 AM CDTSpecial Weather StatementLOT28 min
Aug 17, 5:22 AM CDTSevere Thunderstorm WarningLOT23 min
Aug 19, 2:47 AM CDTHeat AdvisoryLOT41 hr
Aug 20, 4:12 PM CDTHeat AdvisoryLOT52 hr
Aug 21, 2:47 AM CDTExcessive Heat WatchLOT48 hr
Aug 22, 2:59 AM CDTExcessive Heat WarningLOT65 hr
Aug 24, 2:46 PM CDTMesoscale DiscussionSPC119 min
Sep 16, 8:29 PM CDTAreal Flood AdvisoryLOT3 hr
Sep 16, 8:46 PM CDTFlash Flood WarningLOT62 min
Sep 26, 1:20 PM CDTMesoscale DiscussionSPC85 min
Sep 29, 1:34 AM CDTDense Fog AdvisoryLOT7 hr
Oct 8, 1:47 PM CDTFrost AdvisoryLOT19 hr
Oct 9, 2:04 PM CDTFrost AdvisoryLOT18 hr
Oct 10, 2:18 PM CDTFrost AdvisoryLOT18 hr
Oct 29, 3:24 AM CDTFreeze WarningLOT30 hr
Nov 25, 2:10 PM CSTWinter Weather AdvisoryLOT22 hr
Dec 22, 11:35 PM CSTDense Fog AdvisoryLOT12 hr
Dec 23, 3:29 PM CSTDense Fog AdvisoryLOT21 hr
Dec 30, 6:56 AM CSTDense Fog AdvisoryLOT5 hr
Dec 30, 6:15 PM CSTWinter Weather AdvisoryLOT17 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 archive20222024

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.