Alert archive / Minnesota / Cass County

Weather alerts in Cass County, Minnesota, 2024

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

Cass County and its neighbors

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

Alerts
109
Warnings
36
Watches
17
Advisories
31
Busiest month
June44 alerts
Busiest day
June 18, 202419 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 Cass County in 2024 had a tornado report inside them.

Cass County, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4175%0
Severe thunderstorm warnings261638%2070%17 min
Flash flood warnings110%1100%147 min

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Duluth, MN: tornado warnings24579%2596%12 min
NWS Duluth, MN: severe thunderstorm warnings945245%19873%26 min
NWS Duluth, MN: flash flood warnings12742%5483%145 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, 3:34 PM CSTWinter Weather AdvisoryDLH35 hr
Jan 13, 2:30 PM CSTWind Chill AdvisoryDLH70 hr
Jan 28, 1:25 AM CSTDense Fog AdvisoryDLH9 hr
Feb 3, 8:50 PM CSTDense Fog AdvisoryDLH15 hr
Feb 4, 3:03 PM CSTDense Fog AdvisoryDLH21 hr
Feb 27, 2:10 PM CSTWind Chill AdvisoryDLH20 hr
Mar 20, 2:51 PM CDTWinter Weather AdvisoryDLH37 hr
Mar 22, 3:46 AM CDTWinter Storm WatchDLH33 hr
Mar 23, 3:35 AM CDTWinter Storm WarningDLH4 days
May 7, 3:22 PM CDTSpecial Weather StatementDLH23 min
May 8, 4:06 AM CDTDense Fog AdvisoryDLH5 hr
May 20, 3:04 PM CDTFlood WatchDLH40 hr
May 24, 9:42 AM CDTWind AdvisoryDLH10 hr
Jun 3, 3:59 PM CDTFlood WatchDLH38 hr
Jun 4, 12:24 PM CDTMesoscale DiscussionSPC3 hr
Jun 4, 1:54 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 4, 2:28 PM CDTSpecial Weather StatementDLH17 min
Jun 5, 3:02 PM CDTMesoscale DiscussionSPC118 min
Jun 5, 3:19 PM CDTSpecial Weather StatementDLH26 min
Jun 12, 2:33 PM CDTMesoscale DiscussionSPC117 min
Jun 12, 3:32 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 12, 4:42 PM CDTSevere Thunderstorm WarningDLH48 min
Jun 12, 4:45 PM CDTSevere Thunderstorm Warning Considerable damage threatDLH45 min
Jun 12, 5:07 PM CDTSevere Thunderstorm Warning Considerable damage threatDLH38 min
Jun 12, 5:26 PM CDTSevere Thunderstorm WarningDLH49 min
Jun 12, 5:32 PM CDTSevere Thunderstorm WarningDLH43 min
Jun 12, 5:35 PM CDTSevere Thunderstorm WarningDLH55 min
Jun 12, 5:35 PM CDTMesoscale DiscussionSPC85 min
Jun 12, 5:39 PM CDTSevere Thunderstorm WarningDLH51 min
Jun 12, 6:17 PM CDTTornado WarningDLH28 min
Jun 16, 4:22 PM CDTFlood WatchDLH63 hr
Jun 17, 11:24 PM CDTSpecial Weather StatementDLH36 min
Jun 17, 11:36 PM CDTMesoscale DiscussionSPC114 min
Jun 18, 1:49 AM CDTMesoscale DiscussionSPC86 min
Jun 18, 2:08 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 18, 3:23 AM CDTSevere Thunderstorm WarningDLH37 min
Jun 18, 5:02 AM CDTSevere Thunderstorm WarningDLH58 min
Jun 18, 5:56 AM CDTSpecial Weather StatementDLH34 min
Jun 18, 6:03 AM CDTMesoscale DiscussionSPC87 min
Jun 18, 12:20 PM CDTMesoscale DiscussionSPC115 min
Jun 18, 1:03 PM CDTAreal Flood AdvisoryDLH75 min
Jun 18, 1:24 PM CDTTornado WatchSPC8 hr
Jun 18, 1:57 PM CDTSevere Thunderstorm WarningDLH48 min
Jun 18, 2:46 PM CDTTornado WarningDLH29 min
Jun 18, 2:48 PM CDTSevere Thunderstorm WarningDLH42 min
Jun 18, 3:05 PM CDTTornado WarningDLH40 min
Jun 18, 3:09 PM CDTSevere Thunderstorm WarningDLH39 min
Jun 18, 3:10 PM CDTTornado WarningDLH37 min
Jun 18, 4:01 PM CDTFlash Flood WarningDLH5 hr
Jun 18, 5:05 PM CDTSevere Thunderstorm WarningDLH26 min
Jun 18, 9:04 PM CDTAreal Flood WarningDLH6 days
Jun 20, 9:35 AM CDTAreal Flood AdvisoryDLH29 hr
Jun 24, 5:52 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 24, 7:53 PM CDTMesoscale DiscussionSPC97 min
Jun 24, 10:08 PM CDTSevere Thunderstorm WarningDLH24 min
Jun 28, 11:52 PM CDTSevere Thunderstorm WarningDLH38 min
Jun 29, 12:25 AM CDTSevere Thunderstorm WarningDLH43 min
Jul 4, 5:35 PM CDTAreal Flood AdvisoryDLH13 hr
Jul 13, 3:44 PM CDTMesoscale DiscussionSPC91 min
Jul 13, 5:38 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 13, 7:16 PM CDTMesoscale DiscussionSPC89 min
Jul 13, 10:48 PM CDTSpecial Weather StatementDLH27 min
Jul 13, 11:36 PM CDTSpecial Weather StatementDLH24 min
Jul 28, 8:35 PM CDTAreal Flood AdvisoryDLH4 hr
Jul 30, 2:27 AM CDTSpecial Weather StatementDLH48 min
Jul 30, 3:10 AM CDTSpecial Weather StatementDLH35 min
Jul 31, 1:38 PM CDTMesoscale DiscussionSPC97 min
Jul 31, 2:21 PM CDTSevere Thunderstorm WatchSPC5 hr
Jul 31, 2:45 PM CDTSevere Thunderstorm WarningDLH60 min
Jul 31, 3:40 PM CDTSevere Thunderstorm WarningDLH65 min
Aug 3, 12:10 PM CDTSevere Thunderstorm WarningDLH50 min
Aug 3, 12:53 PM CDTSevere Thunderstorm WarningDLH52 min
Aug 3, 1:09 PM CDTMesoscale DiscussionSPC3 hr
Aug 3, 5:00 PM CDTSevere Thunderstorm WarningDLH45 min
Aug 3, 5:44 PM CDTSpecial Weather StatementDLH31 min
Aug 3, 5:56 PM CDTSevere Thunderstorm WarningDLH49 min
Aug 3, 6:00 PM CDTSevere Thunderstorm Warning Considerable damage threatDLH45 min
Aug 3, 6:26 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 3, 6:41 PM CDTSevere Thunderstorm WarningDLH49 min
Aug 6, 1:32 AM CDTDense Fog AdvisoryDLH6 hr
Aug 24, 2:46 AM CDTDense Fog AdvisoryDLH7 hr
Aug 26, 12:35 PM CDTMesoscale DiscussionSPC85 min
Aug 26, 2:38 PM CDTSevere Thunderstorm WatchSPC5 hr
Aug 26, 2:43 PM CDTMesoscale DiscussionSPC2 hr
Aug 29, 11:59 AM CDTFlood WatchDLH9 hr
Aug 29, 2:15 PM CDTSevere Thunderstorm WarningDLH45 min
Aug 29, 2:33 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 29, 3:45 PM CDTSevere Thunderstorm WarningDLH59 min
Sep 29, 4:04 PM CDTFire Weather WatchDLH12 hr
Sep 30, 3:40 AM CDTRed Flag WarningDLH17 hr
Oct 3, 1:39 PM CDTFrost AdvisoryDLH19 hr
Oct 5, 1:58 PM CDTWind AdvisoryDLH27 hr
Oct 7, 2:41 PM CDTFrost AdvisoryDLH17 hr
Oct 16, 2:40 PM CDTFire Weather WatchDLH11 hr
Oct 17, 1:47 AM CDTRed Flag WarningDLH17 hr
Nov 6, 2:18 AM CSTDense Fog AdvisoryDLH5 hr
Nov 15, 2:09 AM CSTDense Fog AdvisoryDLH10 hr
Nov 15, 8:49 PM CSTDense Fog AdvisoryDLH5 hr
Nov 24, 2:29 AM CSTWinter Weather AdvisoryDLH40 hr
Dec 3, 1:20 PM CSTWind AdvisoryDLH38 hr
Dec 4, 2:53 AM CSTWinter Weather AdvisoryDLH27 hr
Dec 7, 2:16 PM CSTWinter Weather AdvisoryDLH47 hr
Dec 11, 2:24 AM CSTCold Weather AdvisoryDLH32 hr
Dec 13, 12:54 PM CSTWinter Weather AdvisoryDLH49 hr
Dec 18, 1:15 PM CSTWinter Storm WarningDLH24 hr
Dec 18, 1:15 PM CSTWinter Weather AdvisoryDLH42 hr
Dec 23, 9:00 PM CSTDense Fog AdvisoryDLH12 hr
Dec 26, 1:09 PM CSTDense Fog AdvisoryDLH45 hr
Dec 28, 7:55 PM CSTDense Fog AdvisoryDLH49 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.