Alert archive / Minnesota / Cass County

Weather alerts in Cass County, Minnesota, 2026

130 weather alerts in 2026, 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 2026. Tap one for its archive.

Alerts
130
Warnings
50
Watches
26
Advisories
33
Busiest month
June29 alerts
Busiest day
June 29, 20269 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 5 tornado warnings covering Cass County in 2026 had a tornado report inside them.

Cass County, 2026

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings50100%0
Severe thunderstorm warnings262215%2882%29 min
Flash flood warnings00

Each office's whole area, 2026

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Duluth, MN: tornado warnings140100%20%
NWS Duluth, MN: severe thunderstorm warnings1257044%19181%25 min

An office's figures cover every county it serves, including across state lines.

The year is still running; reports filed late and damage surveys can still change these figures.

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 4, 2:31 AM CSTWinter Weather AdvisoryDLH21 hr
Jan 5, 2:22 PM CSTDense Fog AdvisoryDLH22 hr
Jan 7, 6:16 PM CSTDense Fog AdvisoryDLH26 hr
Jan 17, 1:10 PM CSTCold Weather AdvisoryDLH71 hr
Jan 18, 1:34 AM CSTWinter Weather AdvisoryDLH31 hr
Jan 20, 12:43 PM CSTCold Weather AdvisoryDLH49 hr
Jan 20, 12:43 PM CSTExtreme Cold WatchDLH49 hr
Jan 20, 12:43 PM CSTExtreme Cold WarningDLH4 days
Jan 23, 2:40 PM CSTCold Weather AdvisoryDLH69 hr
Jan 29, 12:50 PM CSTCold Weather AdvisoryDLH22 hr
Feb 13, 12:45 PM CSTDense Fog AdvisoryDLH5 hr
Feb 15, 4:12 AM CSTDense Fog AdvisoryDLH18 hr
Feb 15, 2:32 PM CSTWinter Storm WatchDLH35 hr
Feb 17, 1:45 AM CSTWinter Weather AdvisoryDLH58 hr
Feb 26, 11:02 AM CSTWind AdvisoryDLH37 hr
Mar 4, 4:59 PM CSTDense Fog AdvisoryDLH15 hr
Mar 6, 11:31 AM CSTWinter Weather AdvisoryDLH18 hr
Mar 11, 12:54 PM CDTWinter Storm WatchDLH13 hr
Mar 11, 12:57 PM CDTHigh Wind WatchDLH12 hr
Mar 12, 1:22 AM CDTHigh Wind WarningDLH29 hr
Mar 12, 1:27 AM CDTWinter Weather AdvisoryDLH36 hr
Mar 12, 4:50 PM CDTMesoscale DiscussionSPC4 hr
Mar 13, 12:58 PM CDTWinter Storm WatchDLH12 hr
Mar 13, 12:58 PM CDTWinter Storm WarningDLH60 hr
Mar 14, 1:23 AM CDTWinter Weather AdvisoryDLH37 hr
Mar 27, 8:01 AM CDTFire Weather WatchDLH3 hr
Mar 27, 11:14 AM CDTRed Flag WarningDLH32 hr
Mar 30, 11:09 AM CDTWinter Weather AdvisoryDLH24 hr
Mar 31, 2:24 PM CDTWinter Storm WatchDLH11 hr
Apr 1, 1:13 AM CDTWinter Weather AdvisoryDLH54 hr
Apr 1, 1:59 PM CDTWinter Storm WatchDLH36 hr
Apr 3, 2:10 AM CDTWinter Storm WarningDLH45 hr
Apr 4, 9:50 AM CDTWinter Weather AdvisoryDLH12 hr
Apr 8, 9:58 AM CDTSnow Squall WarningDLH62 min
Apr 8, 10:56 AM CDTSnow Squall WarningDLH64 min
Apr 16, 10:34 AM CDTRed Flag WarningDLH9 hr
Apr 19, 2:10 PM CDTFire Weather WatchDLH13 hr
Apr 20, 3:15 AM CDTRed Flag WarningDLH17 hr
Apr 21, 1:28 PM CDTFire Weather WatchDLH14 hr
Apr 22, 3:08 AM CDTRed Flag WarningDLH17 hr
May 8, 7:40 AM CDTRed Flag WarningDLH12 hr
May 9, 1:40 PM CDTRed Flag WarningDLH5 hr
May 13, 9:51 AM CDTFire Weather WatchDLH26 hr
May 14, 10:10 AM CDTRed Flag WarningDLH7 hr
May 14, 11:25 AM CDTRed Flag WarningDLH34 hr
May 16, 9:54 AM CDTRed Flag WarningDLH11 hr
May 19, 2:09 PM CDTFreeze WarningDLH18 hr
May 24, 12:44 AM CDTDense Fog AdvisoryDLH8 hr
May 26, 3:14 PM CDTMesoscale DiscussionSPC2 hr
May 26, 5:27 PM CDTSevere Thunderstorm WarningDLH63 min
Jun 9, 1:15 AM CDTHeat AdvisoryDLH19 hr
Jun 10, 1:42 AM CDTMesoscale DiscussionSPC2 hr
Jun 10, 2:39 AM CDTSevere Thunderstorm WatchSPC3 hr
Jun 10, 3:02 AM CDTSevere Thunderstorm WarningDLH58 min
Jun 10, 4:04 AM CDTMesoscale DiscussionSPC116 min
Jun 10, 12:35 PM CDTMesoscale DiscussionSPC115 min
Jun 10, 12:50 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 10, 2:57 PM CDTMesoscale DiscussionSPC2 hr
Jun 10, 5:22 PM CDTSevere Thunderstorm WarningDLH53 min
Jun 19, 3:01 PM CDTTornado WarningDLH14 min
Jun 19, 3:30 PM CDTSevere Thunderstorm WarningDLH60 min
Jun 23, 1:03 PM CDTMesoscale DiscussionSPC117 min
Jun 23, 5:40 PM CDTMesoscale DiscussionSPC95 min
Jun 28, 12:45 PM CDTHeat AdvisoryDLH54 hr
Jun 29, 10:13 AM CDTSevere Thunderstorm WatchSPC8 hr
Jun 29, 11:03 AM CDTSevere Thunderstorm Warning Considerable damage threatDLH87 min
Jun 29, 11:36 AM CDTTornado WarningDLH39 min
Jun 29, 11:37 AM CDTMesoscale DiscussionSPC113 min
Jun 29, 11:47 AM CDTTornado WarningDLH43 min
Jun 29, 12:01 PM CDTSevere Thunderstorm Warning Considerable damage threatDLH59 min
Jun 29, 12:05 PM CDTTornado WarningDLH40 min
Jun 29, 12:24 PM CDTSevere Thunderstorm Warning Considerable damage threatDLH81 min
Jun 29, 12:49 PM CDTSevere Thunderstorm WarningDLH56 min
Jun 29, 7:25 PM CDTMesoscale DiscussionSPC2 hr
Jun 29, 7:48 PM CDTTornado WatchSPC6 hr
Jun 29, 10:04 PM CDTMesoscale DiscussionSPC116 min
Jun 29, 10:32 PM CDTSevere Thunderstorm Warning Considerable damage threatDLH58 min
Jun 29, 10:52 PM CDTTornado WarningDLH38 min
Jun 29, 11:08 PM CDTSevere Thunderstorm Warning Considerable damage threatDLH67 min
Jul 2, 4:35 AM CDTHeat AdvisoryDLH15 hr
Jul 3, 8:21 PM CDTSevere Thunderstorm WarningDLH24 min
Jul 4, 1:27 PM CDTAreal Flood AdvisoryDLH3 hr
Jul 6, 1:40 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 6, 8:20 PM CDTSevere Thunderstorm WatchSPC5 hr
Jul 6, 8:45 PM CDTSevere Thunderstorm WarningDLH60 min
Jul 6, 9:33 PM CDTSevere Thunderstorm WarningDLH57 min
Jul 7, 1:31 PM CDTFlood WatchDLH20 hr
Jul 10, 1:00 PM CDTHeat AdvisoryDLH32 hr
Jul 10, 1:00 PM CDTExtreme Heat WatchDLH25 hr
Jul 11, 1:33 PM CDTHeat AdvisoryDLH4 days
Jul 11, 1:33 PM CDTExtreme Heat WarningDLH4 days
Jul 11, 2:51 PM CDTFire Weather WatchDLH31 hr
Jul 12, 9:39 PM CDTRed Flag WarningDLH24 hr
Jul 17, 12:55 AM CDTHeat AdvisoryDLH20 hr
Jul 19, 1:12 AM CDTHeat AdvisoryDLH19 hr
Jul 24, 2:07 PM CDTHeat AdvisoryDLH31 hr
Jul 24, 2:07 PM CDTExtreme Heat WatchDLH22 hr
Jul 24, 3:34 PM CDTTornado WatchSPC9 hr
Jul 24, 5:32 PM CDTMesoscale DiscussionSPC58 min
Jul 24, 5:47 PM CDTSevere Thunderstorm Warning Destructive damage threatDLH58 min
Jul 24, 7:35 PM CDTMesoscale DiscussionSPC85 min
Jul 24, 10:31 PM CDTSevere Thunderstorm WarningDLH59 min
Jul 25, 11:52 AM CDTExtreme Heat WarningDLH33 hr
Jul 26, 1:00 AM CDTDense Fog AdvisoryDLH8 hr
Jul 26, 11:54 PM CDTMesoscale DiscussionSPC96 min
Jul 28, 2:31 PM CDTHeat AdvisoryDLH28 hr
Jul 30, 1:37 PM CDTMesoscale DiscussionSPC113 min
Aug 3, 5:54 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 3, 9:04 PM CDTMesoscale DiscussionSPC116 min
Aug 7, 6:14 AM CDTSevere Thunderstorm WarningDLH46 min
Aug 17, 4:00 PM CDTMesoscale DiscussionSPC90 min
Aug 17, 5:22 PM CDTSevere Thunderstorm WarningDLH53 min
Aug 20, 5:10 PM CDTSevere Thunderstorm WarningDLH65 min
Aug 20, 6:07 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 20, 6:45 PM CDTSevere Thunderstorm WarningDLH60 min
Sep 3, 11:46 AM CDTMesoscale DiscussionSPC2 hr
Sep 3, 3:17 PM CDTMesoscale DiscussionSPC88 min
Sep 3, 3:46 PM CDTSevere Thunderstorm WatchSPC9 hr
Sep 3, 4:56 PM CDTSevere Thunderstorm WarningDLH64 min
Sep 3, 5:54 PM CDTSevere Thunderstorm Warning Considerable damage threatDLH66 min
Sep 3, 10:38 PM CDTSevere Thunderstorm WarningDLH67 min
Sep 3, 11:29 PM CDTSevere Thunderstorm WarningDLH61 min
Sep 3, 11:55 PM CDTMesoscale DiscussionSPC2 hr
Sep 11, 3:51 PM CDTMesoscale DiscussionSPC54 min
Sep 11, 6:39 PM CDTSevere Thunderstorm WatchSPC3 hr
Sep 11, 7:10 PM CDTSevere Thunderstorm WarningDLH35 min
Sep 11, 7:22 PM CDTSevere Thunderstorm WarningDLH53 min
Sep 11, 7:43 PM CDTSevere Thunderstorm WarningDLH34 min
Sep 17, 4:18 AM CDTDense Fog AdvisoryDLH6 hr
Sep 21, 12:59 PM CDTFrost AdvisoryDLH19 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 archive2025

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.