Alert archive / Michigan / Ottawa County

Weather alerts in Ottawa County, Michigan, 2015

115 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Ottawa County and its neighbors

Each county as a circle sized by its count in 2015. Tap one for its archive.

Alerts
115
Warnings
18
Watches
13
Advisories
37
Busiest month
August17 alerts
Busiest day
July 18, 20156 alerts

Over time

By month

Warning verification

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

Ottawa County, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings7443%714%3 min
Flash flood warnings00

Each office's whole area, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Grand Rapids, MI: tornado warnings20100%20%
NWS Grand Rapids, MI: severe thunderstorm warnings623347%9066%26 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, 3:18 PM ESTWinter Weather AdvisoryGRR4 days
Jan 4, 3:47 PM ESTWinter Storm WatchGRR12 hr
Jan 6, 11:55 AM ESTWinter Weather AdvisoryGRR27 hr
Jan 7, 3:53 PM ESTWinter Storm WarningGRR48 hr
Jan 21, 4:29 AM ESTWinter Weather AdvisoryGRR6 hr
Jan 28, 3:45 AM ESTWinter Weather AdvisoryGRR35 hr
Jan 31, 3:10 AM ESTWinter Weather AdvisoryGRR48 hr
Jan 31, 3:22 PM ESTWinter Storm WarningGRR36 hr
Feb 3, 2:37 PM ESTWinter Weather AdvisoryGRR19 hr
Feb 11, 3:48 AM ESTWinter Weather AdvisoryGRR39 hr
Feb 13, 3:45 AM ESTWinter Storm WatchGRR8 hr
Feb 13, 11:47 AM ESTWinter Storm WarningGRR39 hr
Feb 14, 7:45 PM ESTWind Chill WarningGRR16 hr
Feb 15, 11:36 AM ESTWind Chill AdvisoryGRR22 hr
Feb 17, 9:37 PM ESTWinter Weather AdvisoryGRR45 hr
Feb 18, 12:28 PM ESTWind Chill AdvisoryGRR46 hr
Feb 22, 3:11 AM ESTWind Chill AdvisoryGRR32 hr
Feb 23, 3:22 PM ESTWinter Weather AdvisoryGRR32 hr
Mar 2, 3:57 PM ESTWinter Weather AdvisoryGRR27 hr
Mar 11, 8:44 AM EDTDense Fog AdvisoryGRR2 hr
Apr 9, 4:01 AM EDTSpecial Weather StatementGRR89 min
Apr 9, 2:37 PM EDTAreal Flood AdvisoryGRR45 hr
Apr 9, 3:55 PM EDTWind AdvisoryGRR23 hr
Apr 9, 9:27 PM EDTMesoscale DiscussionSPC93 min
Apr 9, 9:55 PM EDTSevere Thunderstorm WatchSPC5 hr
Apr 9, 11:09 PM EDTSevere Thunderstorm WarningGRR51 min
Apr 10, 5:17 PM EDTSpecial Weather StatementGRR118 min
Apr 22, 3:31 PM EDTFreeze WarningGRR17 hr
Apr 23, 3:27 PM EDTFreeze WarningGRR18 hr
Apr 27, 3:42 PM EDTFrost AdvisoryGRR17 hr
May 11, 6:30 AM EDTDense Fog AdvisoryGRR4 hr
May 13, 3:21 PM EDTFrost AdvisoryGRR17 hr
May 19, 3:39 PM EDTFrost AdvisoryGRR16 hr
May 24, 3:42 PM EDTBeach Hazards StatementGRR40 hr
May 26, 12:22 PM EDTMesoscale DiscussionSPC113 min
May 26, 3:01 PM EDTSevere Thunderstorm WatchSPC6 hr
May 26, 3:57 PM EDTSpecial Weather StatementGRR63 min
May 27, 12:50 AM EDTBeach Hazards StatementGRR10 hr
May 30, 4:19 AM EDTBeach Hazards StatementGRR35 hr
Jun 7, 4:54 AM EDTBeach Hazards StatementGRR18 hr
Jun 10, 4:13 AM EDTBeach Hazards StatementGRR8 hr
Jun 15, 6:24 AM EDTDense Fog AdvisoryGRR3 hr
Jun 18, 3:05 AM EDTDense Fog AdvisoryGRR5 hr
Jun 21, 10:32 PM EDTBeach Hazards StatementGRR33 hr
Jun 22, 12:00 PM EDTMesoscale DiscussionSPC2 hr
Jun 22, 1:23 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 22, 1:40 PM EDTSpecial Weather StatementGRR50 min
Jun 23, 11:36 AM EDTBeach Hazards StatementGRR5 hr
Jul 5, 3:59 PM EDTBeach Hazards StatementGRR60 hr
Jul 13, 7:16 AM EDTSpecial Weather StatementGRR89 min
Jul 13, 7:58 AM EDTSevere Thunderstorm WarningGRR62 min
Jul 13, 11:43 PM EDTMesoscale DiscussionSPC62 min
Jul 14, 12:38 AM EDTSevere Thunderstorm WarningGRR32 min
Jul 14, 3:30 AM EDTBeach Hazards StatementGRR31 hr
Jul 16, 3:38 AM EDTBeach Hazards StatementGRR31 hr
Jul 17, 3:20 PM EDTHeat AdvisoryGRR22 hr
Jul 18, 8:14 AM EDTSpecial Weather StatementGRR2 hr
Jul 18, 9:07 AM EDTSevere Thunderstorm WarningGRR38 min
Jul 18, 4:21 PM EDTMesoscale DiscussionSPC84 min
Jul 18, 4:59 PM EDTTornado WatchSPC5 hr
Jul 18, 5:35 PM EDTSpecial Weather StatementGRR55 min
Jul 18, 6:43 PM EDTMesoscale DiscussionSPC92 min
Jul 30, 7:44 AM EDTBeach Hazards StatementGRR8 hr
Jul 31, 7:59 AM EDTBeach Hazards StatementGRR10 hr
Aug 1, 3:16 PM EDTBeach Hazards StatementGRR40 hr
Aug 2, 3:00 PM EDTMesoscale DiscussionSPC2 hr
Aug 2, 3:59 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 2, 6:08 PM EDTMesoscale DiscussionSPC97 min
Aug 2, 6:27 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 2, 7:15 PM EDTSpecial Weather StatementGRR2 hr
Aug 2, 8:05 PM EDTSevere Thunderstorm WarningGRR55 min
Aug 2, 9:00 PM EDTSevere Thunderstorm WarningGRR90 min
Aug 2, 9:02 PM EDTMesoscale DiscussionSPC118 min
Aug 10, 8:24 PM EDTBeach Hazards StatementGRR28 hr
Aug 13, 3:44 AM EDTBeach Hazards StatementGRR24 hr
Aug 18, 10:56 AM EDTBeach Hazards StatementGRR65 hr
Aug 19, 12:15 AM EDTSpecial Weather StatementGRR60 min
Aug 22, 3:50 PM EDTBeach Hazards StatementGRR3 days
Aug 23, 11:14 AM EDTSpecial Weather StatementGRR61 min
Aug 23, 11:55 AM EDTSpecial Weather StatementGRR2 hr
Aug 31, 1:16 AM EDTDense Fog AdvisoryGRR9 hr
Sep 3, 12:54 AM EDTSpecial Weather StatementGRR66 min
Sep 3, 1:16 AM EDTSevere Thunderstorm WarningGRR30 min
Sep 5, 2:57 AM EDTDense Fog AdvisoryGRR9 hr
Sep 8, 2:44 PM EDTSpecial Weather StatementGRR31 min
Sep 8, 3:11 PM EDTAreal Flood AdvisoryGRR12 hr
Sep 10, 3:52 PM EDTBeach Hazards StatementGRR56 hr
Sep 13, 3:53 AM EDTBeach Hazards StatementGRR5 days
Sep 18, 3:45 PM EDTBeach Hazards StatementGRR30 hr
Sep 18, 10:14 PM EDTAreal Flood AdvisoryGRR3 hr
Oct 15, 3:42 PM EDTFreeze WatchGRR23 hr
Oct 16, 10:44 AM EDTFreeze WatchGRR28 hr
Oct 16, 2:59 PM EDTFreeze WarningGRR19 hr
Oct 17, 2:30 PM EDTFreeze WarningGRR19 hr
Oct 28, 9:33 PM EDTSpecial Weather StatementGRR117 min
Nov 11, 3:58 AM ESTLakeshore Flood WarningGRR36 hr
Nov 11, 4:49 AM ESTHigh Wind WatchGRR11 hr
Nov 11, 3:26 PM ESTHigh Wind WarningGRR24 hr
Nov 11, 3:26 PM ESTWind AdvisoryGRR36 hr
Nov 11, 10:07 PM ESTSpecial Weather StatementGRR83 min
Nov 11, 11:28 PM ESTSpecial Weather StatementGRR107 min
Nov 12, 4:04 PM ESTLakeshore Flood AdvisoryGRR28 hr
Nov 18, 6:09 AM ESTSpecial Weather StatementGRR66 min
Nov 19, 3:08 AM ESTWind AdvisoryGRR21 hr
Nov 20, 3:52 AM ESTWinter Storm WatchGRR12 hr
Nov 20, 3:34 PM ESTWinter Weather AdvisoryGRR36 hr
Nov 22, 2:50 PM ESTWinter Weather AdvisoryGRR22 hr
Dec 5, 12:09 AM ESTFreezing Fog AdvisoryGRR12 hr
Dec 6, 9:53 PM ESTDense Fog AdvisoryGRR12 hr
Dec 12, 4:44 PM ESTDense Fog AdvisoryGRR11 hr
Dec 17, 3:15 PM ESTWinter Weather AdvisoryGRR35 hr
Dec 23, 3:53 AM ESTWind AdvisoryGRR30 hr
Dec 27, 3:42 AM ESTWinter Storm WatchGRR12 hr
Dec 27, 3:53 PM ESTWinter Storm WarningGRR35 hr
Dec 28, 7:00 PM ESTMesoscale DiscussionSPC5 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 archive20142016

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.