Alert archive / Illinois / Winnebago County

Weather alerts in Winnebago County, Illinois, 2020

125 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts
125
Warnings
24
Watches
19
Advisories
49
Busiest month
March24 alerts
Busiest day
May 23, 20207 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 4 tornado warnings covering Winnebago County in 2020 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 4 minutes after it went out.

Winnebago County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4175%250%4 min
Severe thunderstorm warnings7614%4195%39 min
Flash flood warnings20100%0

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Chicago, IL: tornado warnings25580%3537%13 min
NWS Chicago, IL: severe thunderstorm warnings1127731%44383%33 min
NWS Chicago, IL: flash flood warnings191142%6483%114 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 9, 1:36 PM CSTWinter Storm WatchLOT22 hr
Jan 10, 4:03 AM CSTWinter Storm WarningLOT44 hr
Jan 12, 7:37 PM CSTWinter Weather AdvisoryLOT7 hr
Jan 14, 2:33 PM CSTWinter Weather AdvisoryLOT21 hr
Jan 16, 2:44 PM CSTWinter Weather AdvisoryLOT51 hr
Jan 18, 2:24 PM CSTWind Chill AdvisoryLOT20 hr
Jan 24, 3:12 AM CSTWinter Weather AdvisoryLOT35 hr
Feb 8, 1:38 PM CSTWinter Weather AdvisoryLOT26 hr
Feb 11, 2:38 PM CSTWinter Weather AdvisoryLOT52 hr
Feb 13, 1:29 AM CSTSpecial Weather StatementLOT61 min
Feb 13, 2:07 PM CSTWind Chill AdvisoryLOT20 hr
Feb 17, 8:24 PM CSTDense Fog AdvisoryLOT6 hr
Feb 23, 2:11 PM CSTWinter Storm WatchLOT48 hr
Mar 5, 2:10 PM CSTWind AdvisoryLOT22 hr
Mar 9, 10:51 AM CDTRiver Flood WatchMKX35 hr
Mar 10, 10:17 AM CDTRiver Flood AdvisoryLOT21 days
Mar 10, 10:30 AM CDTRiver Flood AdvisoryLOT7 days
Mar 19, 6:41 AM CDTDense Fog AdvisoryLOT3 hr
Mar 19, 10:34 AM CDTRiver Flood WatchLOT10 hr
Mar 19, 10:39 AM CDTRiver Flood AdvisoryLOT20 hr
Mar 19, 10:39 AM CDTRiver Flood AdvisoryLOT21 days
Mar 19, 10:51 AM CDTRiver Flood WatchMKX3 days
Mar 19, 10:51 AM CDTRiver Flood WatchMKX21 days
Mar 19, 8:37 PM CDTRiver Flood AdvisoryLOT21 days
Mar 20, 10:38 AM CDTRiver Flood AdvisoryLOT46 hr
Mar 20, 10:47 AM CDTRiver Flood WatchMKX21 days
Mar 20, 12:06 PM CDTRiver Flood WarningMKX21 days
Mar 23, 5:21 AM CDTDense Fog AdvisoryLOT5 hr
Mar 28, 2:29 AM CDTRiver Flood WarningLOT4 days
Mar 28, 2:29 AM CDTRiver Flood WarningLOT7 days
Mar 28, 2:29 AM CDTRiver Flood WarningLOT21 days
Mar 28, 2:39 AM CDTRiver Flood AdvisoryLOT21 days
Mar 28, 2:43 PM CDTWind AdvisoryLOT29 hr
Mar 28, 7:01 PM CDTSevere Thunderstorm WarningLOT29 min
Mar 28, 8:41 PM CDTTornado WatchSPC3 hr
Mar 28, 9:19 PM CDTTornado WarningLOT26 min
Mar 29, 10:17 AM CDTRiver Flood AdvisoryLOT6 days
Apr 7, 3:06 PM CDTMesoscale DiscussionSPC114 min
Apr 7, 5:07 PM CDTMesoscale DiscussionSPC83 min
Apr 7, 5:26 PM CDTSevere Thunderstorm WatchSPC6 hr
Apr 7, 6:14 PM CDTSevere Thunderstorm WarningLOT61 min
Apr 7, 7:01 PM CDTSevere Thunderstorm WarningLOT59 min
Apr 7, 7:22 PM CDTMesoscale DiscussionSPC83 min
Apr 8, 4:16 AM CDTDense Fog AdvisoryLOT5 hr
Apr 9, 3:18 AM CDTWind AdvisoryLOT16 hr
Apr 12, 3:57 AM CDTWind AdvisoryLOT36 hr
Apr 15, 5:22 AM CDTWinter Weather AdvisoryLOT5 hr
Apr 20, 6:00 PM CDTSpecial Weather StatementLOT60 min
Apr 29, 11:54 AM CDTRiver Flood WatchLOT10 hr
Apr 29, 10:21 PM CDTRiver Flood WarningLOT11 hr
May 7, 3:33 AM CDTFreeze WatchLOT24 hr
May 8, 3:56 AM CDTFreeze WarningLOT27 hr
May 10, 2:35 PM CDTFrost AdvisoryLOT8 hr
May 11, 2:45 PM CDTFrost AdvisoryLOT17 hr
May 14, 10:47 PM CDTAreal Flood AdvisoryLOT4 hr
May 15, 2:06 AM CDTRiver Flood AdvisoryLOT36 hr
May 15, 10:14 AM CDTRiver Flood WarningLOT6 days
May 17, 1:12 PM CDTRiver Flood AdvisoryLOT25 hr
May 17, 1:12 PM CDTRiver Flood AdvisoryLOT33 hr
May 20, 7:08 PM CDTRiver Flood AdvisoryLOT3 days
May 23, 12:33 PM CDTTornado WatchSPC8 hr
May 23, 2:26 PM CDTSevere Thunderstorm WarningLOT64 min
May 23, 2:51 PM CDTMesoscale DiscussionSPC84 min
May 23, 3:09 PM CDTSevere Thunderstorm WarningLOT66 min
May 23, 3:14 PM CDTTornado WarningLOT61 min
May 23, 4:18 PM CDTSpecial Weather StatementLOT27 min
May 23, 4:30 PM CDTSpecial Weather StatementLOT15 min
May 23, 9:20 PM CDTRiver Flood AdvisoryLOT3 days
May 24, 9:01 AM CDTRiver Flood AdvisoryLOT21 hr
May 24, 9:17 AM CDTRiver Flood AdvisoryLOT16 hr
May 26, 6:55 PM CDTSpecial Weather StatementLOT20 min
Jun 5, 12:26 PM CDTMesoscale DiscussionSPC94 min
Jun 9, 2:33 AM CDTWind AdvisoryLOT21 hr
Jun 10, 2:40 AM CDTSpecial Weather StatementLOT50 min
Jun 26, 5:43 AM CDTSpecial Weather StatementLOT47 min
Jun 26, 12:38 PM CDTMesoscale DiscussionSPC2 hr
Jun 26, 1:38 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 26, 3:39 PM CDTMesoscale DiscussionSPC2 hr
Jun 26, 6:25 PM CDTTornado WarningLOT20 min
Jun 29, 3:33 PM CDTAreal Flood AdvisoryLOT3 hr
Jun 29, 4:23 PM CDTFlash Flood WarningLOT4 hr
Jul 7, 6:59 PM CDTSpecial Weather StatementLOT31 min
Jul 9, 2:51 PM CDTMesoscale DiscussionSPC114 min
Jul 9, 3:39 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 9, 5:39 PM CDTMesoscale DiscussionSPC96 min
Jul 11, 3:58 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 15, 3:18 AM CDTSpecial Weather StatementLOT42 min
Jul 17, 3:36 AM CDTHeat AdvisoryLOT40 hr
Jul 18, 11:00 AM CDTMesoscale DiscussionSPC2 hr
Jul 18, 11:28 AM CDTSpecial Weather StatementLOT62 min
Jul 26, 5:33 PM CDTMesoscale DiscussionSPC87 min
Jul 26, 6:40 PM CDTSpecial Weather StatementLOT65 min
Aug 9, 1:30 PM CDTMesoscale DiscussionSPC2 hr
Aug 9, 5:17 PM CDTSpecial Weather StatementLOT43 min
Aug 10, 10:42 AM CDTMesoscale DiscussionSPC93 min
Aug 10, 11:26 AM CDTSevere Thunderstorm Watch PDSSPC7 hr
Aug 10, 1:36 PM CDTMesoscale DiscussionSPC114 min
Aug 10, 1:41 PM CDTSevere Thunderstorm WarningLOT94 min
Aug 10, 2:43 PM CDTTornado WarningLOT62 min
Aug 10, 3:21 PM CDTAreal Flood AdvisoryLOT3 hr
Aug 10, 4:23 PM CDTHigh Wind WarningLOT90 min
Aug 25, 3:32 PM CDTFlash Flood Warning Considerable damage threatLOT3 min
Aug 28, 5:29 PM CDTMesoscale DiscussionSPC91 min
Sep 6, 9:32 PM CDTMesoscale DiscussionSPC118 min
Oct 1, 3:25 AM CDTFrost AdvisoryLOT30 hr
Oct 4, 3:46 AM CDTFrost AdvisoryLOT28 hr
Oct 14, 3:33 AM CDTWind AdvisoryLOT15 hr
Oct 14, 7:41 PM CDTFreeze WatchLOT7 hr
Oct 15, 2:35 AM CDTFreeze WarningLOT30 hr
Oct 16, 2:40 PM CDTWind AdvisoryLOT28 hr
Oct 22, 4:53 PM CDTMesoscale DiscussionSPC2 hr
Oct 31, 10:44 AM CDTWind AdvisoryLOT30 hr
Nov 10, 2:58 AM CSTWind AdvisoryLOT24 hr
Nov 10, 1:28 PM CSTMesoscale DiscussionSPC92 min
Nov 10, 2:05 PM CSTTornado WatchSPC6 hr
Nov 10, 3:20 PM CSTSevere Thunderstorm WarningLOT70 min
Nov 10, 3:30 PM CSTMesoscale DiscussionSPC2 hr
Nov 14, 3:04 AM CSTWind AdvisoryLOT41 hr
Nov 23, 2:24 PM CSTWinter Weather AdvisoryLOT19 hr
Dec 11, 8:39 PM CSTWinter Weather AdvisoryLOT17 hr
Dec 23, 2:32 AM CSTWind AdvisoryLOT25 hr
Dec 28, 3:31 AM CSTWinter Storm WatchLOT12 hr
Dec 28, 3:04 PM CSTWinter Storm WarningLOT42 hr
Dec 29, 2:17 PM CSTMesoscale DiscussionSPC4 hr
Dec 30, 1:15 AM CSTMesoscale DiscussionSPC6 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 archive20192021

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.