Alert archive / Michigan / Cass County

Weather alerts in Cass County, Michigan, 2018

107 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts
107
Warnings
26
Watches
6
Advisories
37
Busiest month
May20 alerts
Busiest day
May 14, 20185 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Cass County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings11918%1155%18 min
Flash flood warnings10100%10%

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Northern Indiana: tornado warnings6267%633%2 min
NWS Northern Indiana: severe thunderstorm warnings933463%18741%19 min
NWS Northern Indiana: flash flood warnings9278%475%59 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 2, 3:43 AM ESTWinter Weather AdvisoryIWX3 days
Jan 2, 3:06 PM ESTWind Chill AdvisoryIWX16 hr
Jan 3, 2:51 PM ESTWinter Storm WarningIWX64 hr
Jan 7, 3:55 AM ESTWinter Weather AdvisoryIWX31 hr
Jan 10, 10:11 AM ESTDense Fog AdvisoryIWX12 hr
Jan 11, 3:02 PM ESTWinter Weather AdvisoryIWX27 hr
Jan 12, 3:04 AM ESTMesoscale DiscussionSPC6 hr
Jan 14, 3:16 PM ESTWinter Weather AdvisoryIWX34 hr
Jan 21, 5:01 AM ESTDense Fog AdvisoryIWX26 hr
Jan 22, 10:13 PM ESTSpecial Weather StatementIWX32 min
Feb 3, 11:16 AM ESTWinter Weather AdvisoryIWX34 hr
Feb 5, 3:28 AM ESTWinter Weather AdvisoryIWX23 hr
Feb 6, 2:45 PM ESTWinter Weather AdvisoryIWX19 hr
Feb 7, 4:06 AM ESTWinter Storm WatchIWX35 hr
Feb 8, 3:38 AM ESTWinter Storm WarningIWX42 hr
Feb 9, 4:08 AM ESTMesoscale DiscussionSPC6 hr
Feb 10, 2:52 PM ESTWinter Weather AdvisoryIWX22 hr
Feb 14, 6:51 PM ESTDense Fog AdvisoryIWX27 hr
Feb 19, 1:10 AM ESTFlood WatchIWX63 hr
Feb 20, 3:19 AM ESTAreal Flood WarningIWX24 hr
Feb 20, 5:12 AM ESTRiver Flood WarningIWX14 days
Feb 20, 5:12 AM ESTRiver Flood WarningIWX16 days
Feb 20, 11:56 PM ESTAreal Flood WarningIWX48 hr
Feb 22, 11:38 PM ESTAreal Flood WarningIWX60 hr
Feb 25, 1:35 AM ESTWind AdvisoryIWX8 hr
Mar 31, 4:11 AM EDTWind AdvisoryIWX15 hr
Apr 3, 4:54 PM EDTSpecial Weather StatementIWX36 min
Apr 30, 6:21 PM EDTRed Flag WarningIWX26 hr
May 2, 6:29 PM EDTMesoscale DiscussionSPC91 min
May 2, 7:39 PM EDTSevere Thunderstorm WarningIWX51 min
May 2, 8:28 PM EDTSevere Thunderstorm WarningIWX47 min
May 2, 9:27 PM EDTSpecial Weather StatementIWX33 min
May 2, 9:53 PM EDTFlash Flood WatchIWX11 hr
May 2, 10:24 PM EDTSevere Thunderstorm WarningIWX51 min
May 3, 9:48 PM EDTWind AdvisoryIWX18 hr
May 9, 10:21 AM EDTSpecial Weather StatementIWX39 min
May 9, 10:45 AM EDTSpecial Weather StatementIWX45 min
May 9, 11:14 AM EDTSpecial Weather StatementIWX31 min
May 9, 8:38 PM EDTSpecial Weather StatementIWX37 min
May 14, 3:40 AM EDTMesoscale DiscussionSPC2 hr
May 14, 5:44 AM EDTSpecial Weather StatementIWX46 min
May 14, 8:42 AM EDTAreal Flood WarningIWX3 hr
May 14, 11:41 AM EDTRiver Flood WarningIWX3 days
May 14, 7:36 PM EDTMesoscale DiscussionSPC84 min
May 14, 8:51 PM EDTSpecial Weather StatementIWX24 min
May 15, 12:10 AM EDTAreal Flood AdvisoryIWX6 hr
May 15, 8:36 AM EDTRiver Flood WarningIWX37 hr
May 22, 3:08 AM EDTDense Fog AdvisoryIWX7 hr
Jun 9, 3:02 PM EDTSpecial Weather StatementIWX43 min
Jun 9, 4:55 PM EDTAreal Flood AdvisoryIWX3 hr
Jun 9, 5:05 PM EDTFlash Flood WarningIWX3 hr
Jun 16, 3:34 PM EDTHeat AdvisoryIWX52 hr
Jun 20, 3:12 AM EDTSpecial Weather StatementIWX48 min
Jun 21, 6:18 PM EDTAreal Flood AdvisoryIWX3 hr
Jun 22, 6:47 AM EDTAreal Flood AdvisoryIWX3 hr
Jun 27, 3:28 PM EDTExcessive Heat WatchIWX36 hr
Jun 29, 2:58 AM EDTExcessive Heat WarningIWX65 hr
Jul 1, 7:51 PM EDTMesoscale DiscussionSPC114 min
Jul 1, 8:19 PM EDTSpecial Weather StatementIWX56 min
Jul 3, 2:26 PM EDTHeat AdvisoryIWX37 hr
Jul 5, 12:08 AM EDTSpecial Weather StatementIWX22 min
Jul 15, 5:27 PM EDTAreal Flood AdvisoryIWX88 min
Jul 16, 1:32 PM EDTMesoscale DiscussionSPC2 hr
Jul 20, 1:43 PM EDTMesoscale DiscussionSPC92 min
Jul 20, 2:04 PM EDTSpecial Weather StatementIWX56 min
Jul 20, 2:12 PM EDTTornado WatchSPC3 hr
Jul 20, 2:24 PM EDTSevere Thunderstorm WarningIWX51 min
Aug 2, 5:21 PM EDTSevere Thunderstorm WarningIWX24 min
Aug 2, 5:32 PM EDTSpecial Weather StatementIWX43 min
Aug 2, 6:18 PM EDTSpecial Weather StatementIWX42 min
Aug 2, 6:52 PM EDTSevere Thunderstorm WarningIWX38 min
Aug 6, 7:03 PM EDTSevere Thunderstorm WarningIWX24 min
Aug 6, 8:13 PM EDTAreal Flood AdvisoryIWX3 hr
Aug 9, 6:03 PM EDTSpecial Weather StatementIWX42 min
Aug 18, 3:47 AM EDTDense Fog AdvisoryIWX5 hr
Aug 21, 2:49 AM EDTAreal Flood AdvisoryIWX3 hr
Aug 28, 10:54 PM EDTMesoscale DiscussionSPC66 min
Sep 3, 3:26 PM EDTSpecial Weather StatementIWX64 min
Sep 3, 3:34 PM EDTSevere Thunderstorm WarningIWX41 min
Sep 3, 3:44 PM EDTSpecial Weather StatementIWX46 min
Sep 3, 4:10 PM EDTSpecial Weather StatementIWX80 min
Sep 5, 7:01 PM EDTSpecial Weather StatementIWX29 min
Sep 5, 9:06 PM EDTSpecial Weather StatementIWX54 min
Sep 11, 2:28 AM EDTDense Fog AdvisoryIWX6 hr
Sep 20, 3:52 PM EDTSpecial Weather StatementIWX23 min
Sep 20, 4:16 PM EDTMesoscale DiscussionSPC89 min
Sep 20, 5:03 PM EDTSevere Thunderstorm WarningIWX42 min
Sep 20, 5:18 PM EDTSevere Thunderstorm WarningIWX28 min
Sep 20, 5:40 PM EDTAreal Flood AdvisoryIWX3 hr
Sep 25, 6:21 PM EDTMesoscale DiscussionSPC114 min
Sep 25, 8:32 PM EDTSevere Thunderstorm WarningIWX43 min
Sep 25, 8:45 PM EDTSevere Thunderstorm WatchSPC87 min
Oct 6, 1:04 AM EDTAreal Flood AdvisoryIWX3 hr
Oct 12, 2:55 PM EDTFrost AdvisoryIWX18 hr
Oct 15, 2:17 PM EDTFreeze WarningIWX19 hr
Oct 17, 3:02 AM EDTFreeze WarningIWX30 hr
Oct 20, 10:57 AM EDTWind AdvisoryIWX9 hr
Nov 9, 8:35 PM ESTSpecial Weather StatementIWX115 min
Nov 9, 10:34 PM ESTSpecial Weather StatementIWX56 min
Nov 10, 3:24 AM ESTSpecial Weather StatementIWX51 min
Nov 25, 3:38 AM ESTWinter Weather AdvisoryIWX33 hr
Nov 30, 8:17 PM ESTFreezing Fog AdvisoryIWX10 hr
Dec 14, 10:08 PM ESTDense Fog AdvisoryIWX7 hr
Dec 16, 7:40 AM ESTFreezing Fog AdvisoryIWX5 hr
Dec 27, 2:44 PM ESTWind AdvisoryIWX6 hr
Dec 29, 9:45 AM ESTWinter Weather AdvisoryIWX2 hr
Dec 29, 7:37 PM ESTSpecial Weather StatementIWX53 min

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 archive20172019

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.