Alert archive / Illinois / LaSalle County

Weather alerts in LaSalle County, Illinois, 2022

148 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

LaSalle County and its neighbors

Each county as a circle sized by its count in 2022. Tap one for its archive.

Alerts
148
Warnings
37
Watches
22
Advisories
49
Busiest month
February27 alerts
Busiest day
February 17, 20228 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 LaSalle County in 2022 had a tornado report inside them.

LaSalle County, 2022

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings181139%1493%26 min
Flash flood warnings010%

Each office's whole area, 2022

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Chicago, IL: tornado warnings15380%1560%13 min
NWS Chicago, IL: severe thunderstorm warnings14810231%46677%26 min
NWS Chicago, IL: flash flood warnings19858%3379%95 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, 2:27 PM CSTMesoscale DiscussionSPC4 hr
Jan 4, 3:43 AM CSTWinter Weather AdvisoryLOT41 hr
Jan 6, 1:52 PM CSTWind Chill AdvisoryLOT19 hr
Jan 7, 2:17 PM CSTWinter Weather AdvisoryLOT34 hr
Jan 13, 3:47 PM CSTDense Fog AdvisoryLOT17 hr
Jan 22, 9:21 AM CSTWinter Weather AdvisoryLOT32 hr
Jan 25, 3:13 AM CSTWind Chill AdvisoryLOT31 hr
Jan 31, 3:41 AM CSTWinter Storm WatchLOT23 hr
Jan 31, 2:07 PM CSTWinter Storm WarningLOT3 days
Feb 2, 1:13 AM CSTMesoscale DiscussionSPC6 hr
Feb 2, 7:11 AM CSTMesoscale DiscussionSPC5 hr
Feb 15, 3:02 PM CSTWinter Storm WatchLOT13 hr
Feb 16, 3:24 AM CSTWind AdvisoryLOT15 hr
Feb 16, 3:55 AM CSTWinter Storm WarningLOT44 hr
Feb 16, 9:32 PM CSTAreal Flood AdvisoryLOT12 hr
Feb 17, 2:42 AM CSTAreal Flood AdvisoryLOT9 hr
Feb 17, 4:07 AM CSTWinter Weather AdvisoryLOT17 hr
Feb 17, 10:17 AM CSTMesoscale DiscussionSPC5 hr
Feb 17, 11:07 AM CSTRiver Flood WatchLOT10 hr
Feb 17, 11:07 AM CSTRiver Flood WarningLOT21 days
Feb 17, 11:07 AM CSTRiver Flood AdvisoryLOT23 hr
Feb 17, 3:17 PM CSTMesoscale DiscussionSPC118 min
Feb 17, 9:36 PM CSTRiver Flood WarningLOT41 hr
Feb 18, 10:12 AM CSTRiver Flood AdvisoryLOT33 hr
Feb 18, 10:26 AM CSTWinter Weather AdvisoryLOT23 hr
Feb 18, 9:30 PM CSTSnow Squall WarningLOT60 min
Feb 18, 10:05 PM CSTSnow Squall WarningLOT55 min
Feb 21, 10:47 AM CSTRiver Flood AdvisoryLOT47 hr
Feb 21, 2:01 PM CSTFlood WatchLOT22 hr
Feb 22, 12:59 AM CSTDense Fog AdvisoryLOT9 hr
Feb 22, 10:46 AM CSTAreal Flood AdvisoryLOT3 hr
Feb 22, 8:57 PM CSTRiver Flood AdvisoryLOT35 hr
Feb 23, 2:31 AM CSTAreal Flood AdvisoryLOT20 min
Feb 23, 2:52 AM CSTRiver Flood AdvisoryLOT11 hr
Feb 23, 9:45 AM CSTRiver Flood WarningLOT38 hr
Feb 23, 2:50 PM CSTWinter Weather AdvisoryLOT39 hr
Mar 5, 3:25 AM CSTWind AdvisoryLOT30 hr
Mar 5, 8:09 PM CSTMesoscale DiscussionSPC96 min
Mar 5, 8:36 PM CSTSevere Thunderstorm WatchSPC5 hr
Mar 5, 10:14 PM CSTSevere Thunderstorm Warning Considerable damage threatLOT76 min
Mar 5, 10:32 PM CSTMesoscale DiscussionSPC88 min
Mar 6, 2:36 PM CSTWinter Weather AdvisoryLOT21 hr
Mar 25, 3:03 AM CDTWind AdvisoryLOT19 hr
Mar 25, 2:18 PM CDTMesoscale DiscussionSPC2 hr
Mar 30, 11:34 AM CDTRiver Flood WatchLOT6 days
Mar 31, 10:43 AM CDTRiver Flood WatchLOT10 hr
Mar 31, 10:43 AM CDTRiver Flood WarningLOT12 days
Mar 31, 10:43 AM CDTRiver Flood WarningLOT56 hr
Apr 13, 12:04 PM CDTRiver Flood WatchLOT22 hr
Apr 13, 1:48 PM CDTMesoscale DiscussionSPC87 min
Apr 13, 2:08 PM CDTWind AdvisoryLOT21 hr
Apr 13, 3:03 PM CDTSpecial Weather StatementLOT42 min
Apr 14, 10:41 AM CDTHigh Wind WarningLOT8 hr
Apr 22, 4:50 PM CDTSpecial Weather StatementLOT25 min
Apr 24, 11:03 AM CDTSpecial Weather StatementLOT42 min
Apr 25, 3:01 AM CDTFreeze WarningLOT24 hr
Apr 26, 3:20 AM CDTFrost AdvisoryLOT29 hr
Apr 30, 12:32 PM CDTMesoscale DiscussionSPC118 min
Apr 30, 1:46 PM CDTTornado WatchSPC8 hr
Apr 30, 3:20 PM CDTMesoscale DiscussionSPC85 min
Apr 30, 5:35 PM CDTSevere Thunderstorm WarningLOT25 min
Apr 30, 5:57 PM CDTSevere Thunderstorm WarningLOT48 min
Apr 30, 6:00 PM CDTSevere Thunderstorm WarningLOT45 min
Apr 30, 6:02 PM CDTMesoscale DiscussionSPC118 min
May 3, 1:27 PM CDTRiver Flood WatchLOT21 hr
May 4, 10:40 AM CDTRiver Flood WarningLOT5 days
May 11, 5:15 PM CDTMesoscale DiscussionSPC60 min
May 11, 6:14 PM CDTSevere Thunderstorm WarningLOT27 min
May 19, 1:56 AM CDTDense Fog AdvisoryLOT7 hr
May 20, 7:10 PM CDTMesoscale DiscussionSPC2 hr
May 25, 3:37 PM CDTMesoscale DiscussionSPC113 min
May 26, 2:45 PM CDTFlood WatchLOT16 hr
May 26, 5:44 PM CDTSpecial Weather StatementLOT31 min
May 31, 3:40 PM CDTMesoscale DiscussionSPC2 hr
Jun 6, 3:45 PM CDTMesoscale DiscussionSPC2 hr
Jun 6, 5:39 PM CDTSevere Thunderstorm WarningLOT35 min
Jun 11, 3:33 AM CDTDense Fog AdvisoryLOT4 hr
Jun 12, 3:37 PM CDTHeat AdvisoryLOT3 days
Jun 13, 5:38 PM CDTMesoscale DiscussionSPC2 hr
Jun 14, 3:46 AM CDTExcessive Heat WarningLOT40 hr
Jun 15, 7:53 PM CDTMesoscale DiscussionSPC97 min
Jun 20, 2:40 PM CDTHeat AdvisoryLOT29 hr
Jun 25, 5:02 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 25, 7:16 PM CDTMesoscale DiscussionSPC89 min
Jul 4, 1:40 PM CDTMesoscale DiscussionSPC2 hr
Jul 4, 2:05 PM CDTSevere Thunderstorm WarningLOT70 min
Jul 4, 2:22 PM CDTHeat AdvisoryLOT30 hr
Jul 4, 2:30 PM CDTTornado WarningLOT45 min
Jul 4, 2:34 PM CDTAreal Flood AdvisoryLOT3 hr
Jul 4, 2:40 PM CDTSevere Thunderstorm WarningLOT49 min
Jul 4, 3:51 PM CDTSevere Thunderstorm WatchSPC3 hr
Jul 5, 4:34 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 5, 8:41 PM CDTMesoscale DiscussionSPC94 min
Jul 5, 10:24 PM CDTMesoscale DiscussionSPC96 min
Jul 5, 11:58 PM CDTMesoscale DiscussionSPC2 hr
Jul 7, 6:19 PM CDTAreal Flood AdvisoryLOT3 hr
Jul 8, 12:03 PM CDTAreal Flood AdvisoryLOT3 hr
Jul 8, 4:15 PM CDTAreal Flood AdvisoryLOT3 hr
Jul 15, 11:35 AM CDTAreal Flood AdvisoryLOT4 hr
Jul 15, 3:19 PM CDTAreal Flood AdvisoryLOT116 min
Jul 23, 2:52 AM CDTFlood WatchLOT9 hr
Jul 23, 4:01 AM CDTSevere Thunderstorm WatchSPC8 hr
Jul 23, 5:35 AM CDTMesoscale DiscussionSPC85 min
Jul 23, 6:35 AM CDTSpecial Weather StatementLOT25 min
Jul 23, 6:42 AM CDTSevere Thunderstorm WarningLOT34 min
Jul 23, 7:08 AM CDTSpecial Weather StatementLOT37 min
Jul 23, 5:22 PM CDTSevere Thunderstorm Warning Considerable damage threatLOT33 min
Aug 1, 3:28 AM CDTSpecial Weather StatementLOT47 min
Aug 6, 12:21 PM CDTHeat AdvisoryLOT7 hr
Aug 7, 9:25 AM CDTAreal Flood AdvisoryLOT95 min
Aug 7, 10:59 AM CDTAreal Flood AdvisoryLOT3 hr
Aug 8, 9:46 AM CDTAreal Flood AdvisoryLOT3 hr
Aug 8, 10:04 AM CDTFlood WatchLOT3 hr
Aug 20, 2:38 PM CDTSpecial Weather StatementLOT37 min
Aug 20, 3:26 PM CDTSevere Thunderstorm WarningLOT49 min
Aug 21, 1:19 AM CDTDense Fog AdvisoryLOT8 hr
Aug 28, 12:34 PM CDTMesoscale DiscussionSPC86 min
Aug 28, 1:09 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 28, 3:17 PM CDTSevere Thunderstorm WarningLOT73 min
Aug 29, 9:42 AM CDTMesoscale DiscussionSPC2 hr
Aug 29, 10:12 AM CDTSevere Thunderstorm WatchSPC5 hr
Aug 29, 12:02 PM CDTSevere Thunderstorm WarningLOT73 min
Aug 29, 12:19 PM CDTSevere Thunderstorm WarningLOT56 min
Aug 29, 12:53 PM CDTMesoscale DiscussionSPC2 hr
Aug 29, 6:34 PM CDTSevere Thunderstorm WarningLOT41 min
Sep 11, 6:03 AM CDTSpecial Weather StatementLOT27 min
Sep 11, 10:34 AM CDTAreal Flood WarningLOT6 hr
Sep 15, 2:36 AM CDTDense Fog AdvisoryLOT6 hr
Sep 18, 9:28 PM CDTSevere Thunderstorm WatchSPC7 hr
Sep 18, 9:35 PM CDTSevere Thunderstorm WarningLOT37 min
Sep 27, 2:44 PM CDTFrost AdvisoryLOT15 hr
Sep 28, 3:11 PM CDTFrost AdvisoryLOT16 hr
Oct 7, 3:06 AM CDTFreeze WatchLOT11 hr
Oct 7, 1:59 PM CDTFreeze WarningLOT18 hr
Oct 13, 2:26 PM CDTFreeze WarningLOT13 hr
Nov 4, 3:18 AM CDTWind AdvisoryLOT40 hr
Nov 4, 2:05 PM CDTMesoscale DiscussionSPC115 min
Nov 5, 2:21 AM CDTHigh Wind WarningLOT17 hr
Nov 5, 9:28 AM CDTSevere Thunderstorm Warning Considerable damage threatLOT77 min
Nov 5, 9:51 AM CDTMesoscale DiscussionSPC114 min
Nov 5, 10:52 AM CDTSevere Thunderstorm WarningLOT57 min
Nov 14, 2:27 PM CSTWinter Weather AdvisoryLOT35 hr
Dec 2, 3:39 AM CSTWind AdvisoryLOT29 hr
Dec 19, 2:30 PM CSTWinter Storm WatchLOT44 hr
Dec 21, 10:41 AM CSTWinter Storm WarningLOT3 days
Dec 22, 10:59 AM CSTMesoscale DiscussionSPC4 hr
Dec 24, 3:19 AM CSTWinter Weather AdvisoryLOT9 hr
Dec 24, 1:05 PM CSTWind Chill AdvisoryLOT21 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 archive20212023

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.