Alert archive / Michigan / Calhoun County

Weather alerts in Calhoun County, Michigan, 2024

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

Calhoun County and its neighbors

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

Alerts
105
Warnings
25
Watches
15
Advisories
30
Busiest month
June19 alerts
Busiest day
May 7, 20248 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 3 tornado warnings covering Calhoun County in 2024 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 31 minutes after it went out.

Calhoun County, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings3167%2100%31 min
Severe thunderstorm warnings13746%1540%18 min
Flash flood warnings00

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Grand Rapids, MI: tornado warnings21576%888%15 min
NWS Grand Rapids, MI: severe thunderstorm warnings884944%17973%32 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 8, 2:51 PM ESTWinter Weather AdvisoryGRR39 hr
Jan 10, 3:39 PM ESTWinter Storm WatchGRR23 hr
Jan 11, 3:04 PM ESTWinter Storm WarningGRR69 hr
Jan 11, 3:04 PM ESTWinter Weather AdvisoryGRR6 days
Jan 14, 3:16 AM ESTWind Chill AdvisoryGRR33 hr
Jan 14, 9:20 PM ESTWind Chill WarningGRR15 hr
Jan 15, 12:10 PM ESTWind Chill AdvisoryGRR47 hr
Jan 18, 2:05 PM ESTWinter Weather AdvisoryGRR22 hr
Jan 22, 3:23 AM ESTWinter Weather AdvisoryGRR35 hr
Jan 22, 10:17 AM ESTMesoscale DiscussionSPC4 hr
Jan 23, 3:30 PM ESTDense Fog AdvisoryGRR55 hr
Jan 30, 3:39 PM ESTDense Fog AdvisoryGRR12 hr
Feb 8, 11:44 PM ESTSpecial Weather StatementGRR91 min
Feb 27, 3:49 PM ESTWind AdvisoryGRR25 hr
Feb 27, 9:28 PM ESTMesoscale DiscussionSPC62 min
Feb 27, 9:45 PM ESTSevere Thunderstorm WatchSPC6 hr
Feb 27, 10:31 PM ESTSevere Thunderstorm WarningGRR44 min
Feb 27, 11:44 PM ESTMesoscale DiscussionSPC2 hr
Feb 28, 12:01 AM ESTTornado WarningGRR59 min
Mar 21, 3:43 PM EDTWinter Weather AdvisoryGRR30 hr
Mar 26, 2:08 PM EDTMesoscale DiscussionSPC3 hr
Mar 26, 3:47 PM EDTSpecial Weather StatementGRR58 min
Apr 11, 2:59 PM EDTWind AdvisoryGRR31 hr
Apr 17, 11:25 AM EDTMesoscale DiscussionSPC95 min
Apr 17, 11:52 AM EDTSevere Thunderstorm WatchSPC6 hr
Apr 21, 2:50 PM EDTFrost AdvisoryGRR17 hr
Apr 22, 8:23 AM EDTRed Flag WarningGRR12 hr
Apr 23, 3:46 PM EDTFreeze WatchGRR12 hr
Apr 24, 3:43 AM EDTFreeze WarningGRR28 hr
Apr 25, 2:43 PM EDTFreeze WarningGRR17 hr
May 4, 11:42 PM EDTSevere Thunderstorm WarningGRR44 min
May 7, 11:22 AM EDTSpecial Weather StatementGRR83 min
May 7, 4:33 PM EDTMesoscale DiscussionSPC87 min
May 7, 4:55 PM EDTTornado WatchSPC6 hr
May 7, 5:55 PM EDTSevere Thunderstorm Warning Considerable damage threatGRR95 min
May 7, 6:13 PM EDTTornado Warning Tornado observedConsiderable damage threatGRR62 min
May 7, 6:46 PM EDTMesoscale DiscussionSPC89 min
May 7, 7:26 PM EDTSevere Thunderstorm WarningGRR82 min
May 7, 7:35 PM EDTTornado Warning Tornado observedConsiderable damage threatGRR25 min
May 20, 4:21 PM EDTMesoscale DiscussionSPC114 min
May 20, 4:41 PM EDTSevere Thunderstorm WatchSPC5 hr
May 20, 7:49 PM EDTMesoscale DiscussionSPC86 min
May 20, 8:06 PM EDTSpecial Weather StatementGRR84 min
May 26, 4:21 PM EDTSpecial Weather StatementGRR54 min
Jun 5, 12:34 PM EDTSpecial Weather StatementGRR116 min
Jun 13, 2:02 PM EDTMesoscale DiscussionSPC118 min
Jun 13, 2:50 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 13, 4:53 PM EDTSevere Thunderstorm WarningGRR38 min
Jun 13, 5:46 PM EDTMesoscale DiscussionSPC89 min
Jun 16, 3:14 AM EDTExcessive Heat WatchGRR24 hr
Jun 16, 10:23 PM EDTSevere Thunderstorm WarningGRR67 min
Jun 16, 11:08 PM EDTMesoscale DiscussionSPC67 min
Jun 16, 11:21 PM EDTSevere Thunderstorm WarningGRR39 min
Jun 16, 11:30 PM EDTSevere Thunderstorm WarningGRR60 min
Jun 17, 3:04 AM EDTHeat AdvisoryGRR6 days
Jun 17, 5:15 AM EDTAreal Flood AdvisoryGRR6 hr
Jun 21, 1:57 PM EDTMesoscale DiscussionSPC93 min
Jun 25, 1:55 AM EDTSevere Thunderstorm WatchSPC7 hr
Jun 25, 5:37 AM EDTMesoscale DiscussionSPC113 min
Jun 25, 7:20 AM EDTSpecial Weather StatementGRR40 min
Jun 25, 7:27 AM EDTSevere Thunderstorm WarningGRR48 min
Jun 25, 7:28 AM EDTMesoscale DiscussionSPC92 min
Jun 29, 5:38 AM EDTAreal Flood AdvisoryGRR5 hr
Jul 5, 2:47 PM EDTMesoscale DiscussionSPC58 min
Jul 9, 3:41 AM EDTFlood WatchGRR36 hr
Jul 9, 3:41 PM EDTAreal Flood AdvisoryGRR24 hr
Jul 11, 6:09 AM EDTDense Fog AdvisoryGRR3 hr
Jul 12, 5:55 AM EDTRiver Flood WarningGRR15 hr
Jul 15, 1:54 AM EDTMesoscale DiscussionSPC2 hr
Jul 15, 11:11 AM EDTFlood WatchGRR15 hr
Jul 16, 12:11 AM EDTMesoscale DiscussionSPC2 hr
Jul 16, 12:25 AM EDTSevere Thunderstorm WarningGRR39 min
Jul 16, 12:31 AM EDTSevere Thunderstorm WarningGRR89 min
Jul 16, 12:34 AM EDTAreal Flood AdvisoryGRR5 hr
Jul 16, 12:35 AM EDTSevere Thunderstorm WatchSPC4 hr
Jul 16, 1:38 AM EDTMesoscale DiscussionSPC2 hr
Aug 2, 5:19 PM EDTSpecial Weather StatementGRR86 min
Aug 6, 7:31 AM EDTMesoscale DiscussionSPC119 min
Aug 6, 8:04 AM EDTTornado WatchSPC9 hr
Aug 26, 1:20 PM EDTHeat AdvisoryGRR29 hr
Aug 27, 1:48 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 27, 3:46 PM EDTMesoscale DiscussionSPC119 min
Aug 27, 4:50 PM EDTSevere Thunderstorm WarningGRR42 min
Aug 30, 2:25 PM EDTMesoscale DiscussionSPC95 min
Aug 30, 4:44 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 30, 4:52 PM EDTSevere Thunderstorm WarningGRR26 min
Aug 30, 5:12 PM EDTSpecial Weather StatementGRR33 min
Aug 30, 5:52 PM EDTSpecial Weather StatementGRR23 min
Sep 21, 12:42 AM EDTDense Fog AdvisoryGRR9 hr
Oct 6, 10:17 AM EDTRed Flag WarningGRR10 hr
Oct 9, 3:45 PM EDTFrost AdvisoryGRR17 hr
Oct 12, 4:52 PM EDTMesoscale DiscussionSPC83 min
Oct 14, 3:01 AM EDTFreeze WarningGRR28 hr
Oct 31, 3:31 AM EDTWind AdvisoryGRR22 hr
Nov 18, 4:04 AM ESTDense Fog AdvisoryGRR6 hr
Nov 28, 1:59 PM ESTWinter Weather AdvisoryGRR46 hr
Dec 1, 3:07 AM ESTWinter Weather AdvisoryGRR52 hr
Dec 4, 3:33 AM ESTWinter Storm WarningGRR45 hr
Dec 4, 3:33 AM ESTWinter Weather AdvisoryGRR41 hr
Dec 4, 6:52 PM ESTSpecial Weather StatementGRR113 min
Dec 4, 7:42 PM ESTSpecial Weather StatementGRR63 min
Dec 10, 3:29 PM ESTWinter Weather AdvisoryGRR48 hr
Dec 14, 12:31 PM ESTWinter Weather AdvisoryGRR22 hr
Dec 19, 2:05 AM ESTWinter Weather AdvisoryGRR32 hr
Dec 22, 2:53 PM ESTWinter Weather AdvisoryGRR32 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.