Alert archive / Michigan / Ionia County

Weather alerts in Ionia County, Michigan, 2018

93 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Ionia County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts
93
Warnings
10
Watches
9
Advisories
46
Busiest month
February19 alerts
Busiest day
August 2, 20184 alerts

Over time

By month

Warning verification

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

Ionia County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings220%0
Flash flood warnings00

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Grand Rapids, MI: tornado warnings3167%617%12 min
NWS Grand Rapids, MI: severe thunderstorm warnings583540%11271%22 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 3, 3:20 PM ESTWind Chill AdvisoryGRR15 hr
Jan 4, 6:10 AM ESTWind Chill AdvisoryGRR29 hr
Jan 5, 3:54 PM ESTWind Chill AdvisoryGRR15 hr
Jan 7, 12:20 PM ESTWinter Weather AdvisoryGRR21 hr
Jan 10, 4:57 PM ESTDense Fog AdvisoryGRR11 hr
Jan 11, 11:07 AM ESTRiver Flood AdvisoryGRR7 days
Jan 11, 3:26 PM ESTWinter Weather AdvisoryGRR22 hr
Jan 12, 3:04 AM ESTMesoscale DiscussionSPC6 hr
Jan 14, 3:26 PM ESTWinter Weather AdvisoryGRR40 hr
Jan 21, 9:03 PM ESTRiver Flood AdvisoryGRR7 days
Jan 22, 11:14 PM ESTSpecial Weather StatementGRR61 min
Feb 2, 3:03 PM ESTWinter Weather AdvisoryGRR52 hr
Feb 4, 10:17 PM ESTWinter Weather AdvisoryGRR29 hr
Feb 5, 2:19 PM ESTRiver Flood AdvisoryGRR6 days
Feb 6, 2:56 PM ESTWinter Weather AdvisoryGRR25 hr
Feb 8, 3:42 AM ESTWinter Weather AdvisoryGRR39 hr
Feb 9, 12:01 PM ESTRiver Flood AdvisoryGRR46 hr
Feb 10, 2:45 PM ESTWinter Weather AdvisoryGRR24 hr
Feb 14, 8:00 PM ESTDense Fog AdvisoryGRR12 hr
Feb 15, 11:35 AM ESTDense Fog AdvisoryGRR6 hr
Feb 18, 1:18 PM ESTRiver Flood AdvisoryGRR24 hr
Feb 18, 1:18 PM ESTRiver Flood AdvisoryGRR10 days
Feb 18, 3:02 PM ESTFlood WatchGRR45 hr
Feb 18, 9:49 PM ESTRiver Flood WarningGRR9 days
Feb 18, 10:21 PM ESTRiver Flood AdvisoryGRR24 hr
Feb 19, 12:53 PM ESTRiver Flood WarningGRR7 days
Feb 20, 6:23 AM ESTAreal Flood WarningGRR55 hr
Feb 25, 1:34 AM ESTWind AdvisoryGRR12 hr
Feb 25, 11:05 AM ESTRiver Flood AdvisoryGRR36 hr
Feb 28, 2:55 PM ESTWinter Weather AdvisoryGRR30 hr
Mar 7, 2:59 AM ESTWinter Weather AdvisoryGRR9 hr
Mar 30, 2:53 PM EDTWind AdvisoryGRR28 hr
Apr 2, 3:39 PM EDTWinter Weather AdvisoryGRR43 hr
Apr 3, 2:53 PM EDTSpecial Weather StatementGRR67 min
Apr 5, 2:45 AM EDTWinter Weather AdvisoryGRR31 hr
Apr 12, 3:24 AM EDTWinter Storm WatchGRR36 hr
Apr 13, 3:31 PM EDTWinter Storm WarningGRR54 hr
Apr 13, 9:39 PM EDTRiver Flood AdvisoryGRR13 days
Apr 15, 12:14 AM EDTMesoscale DiscussionSPC6 hr
Apr 18, 3:22 PM EDTWinter Weather AdvisoryGRR12 hr
Apr 30, 12:28 PM EDTFire Weather WatchGRR8 hr
Apr 30, 3:00 PM EDTRed Flag WarningGRR29 hr
May 3, 12:15 AM EDTSpecial Weather StatementGRR60 min
May 3, 4:08 PM EDTWind AdvisoryGRR24 hr
May 4, 10:17 AM EDTHigh Wind WarningGRR6 hr
May 11, 12:43 PM EDTRiver Flood AdvisoryGRR7 days
May 13, 5:15 PM EDTRiver Flood AdvisoryGRR12 days
May 30, 4:35 PM EDTMesoscale DiscussionSPC115 min
Jun 16, 2:31 PM EDTHeat AdvisoryGRR29 hr
Jun 27, 3:54 PM EDTExcessive Heat WatchGRR34 hr
Jun 29, 2:23 AM EDTExcessive Heat WarningGRR66 hr
Jul 1, 6:35 PM EDTSevere Thunderstorm WatchSPC3 hr
Jul 1, 9:04 PM EDTMesoscale DiscussionSPC116 min
Jul 1, 9:16 PM EDTSpecial Weather StatementGRR59 min
Jul 4, 3:17 AM EDTHeat AdvisoryGRR17 hr
Jul 16, 1:32 PM EDTMesoscale DiscussionSPC2 hr
Jul 20, 7:35 AM EDTSpecial Weather StatementGRR25 min
Jul 20, 8:26 AM EDTSpecial Weather StatementGRR34 min
Jul 20, 8:36 AM EDTSpecial Weather StatementGRR24 min
Aug 2, 4:39 PM EDTSpecial Weather StatementGRR3 hr
Aug 2, 5:39 PM EDTSevere Thunderstorm WarningGRR37 min
Aug 2, 7:30 PM EDTSpecial Weather StatementGRR60 min
Aug 2, 7:59 PM EDTSpecial Weather StatementGRR61 min
Aug 19, 7:09 AM EDTSpecial Weather StatementGRR111 min
Aug 26, 10:32 PM EDTMesoscale DiscussionSPC88 min
Aug 26, 11:05 PM EDTSpecial Weather StatementGRR115 min
Aug 28, 10:59 AM EDTFlood WatchGRR16 hr
Aug 28, 6:23 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 28, 8:20 PM EDTMesoscale DiscussionSPC55 min
Sep 1, 12:43 PM EDTFlood WatchGRR18 hr
Sep 1, 6:57 PM EDTMesoscale DiscussionSPC63 min
Sep 2, 6:05 AM EDTSpecial Weather StatementGRR55 min
Sep 5, 5:56 PM EDTSpecial Weather StatementGRR64 min
Sep 11, 2:17 AM EDTDense Fog AdvisoryGRR8 hr
Sep 14, 3:40 AM EDTDense Fog AdvisoryGRR6 hr
Sep 20, 11:55 AM EDTSpecial Weather StatementGRR50 min
Sep 21, 6:06 AM EDTSpecial Weather StatementGRR54 min
Sep 21, 7:41 AM EDTSpecial Weather StatementGRR94 min
Sep 25, 6:21 PM EDTMesoscale DiscussionSPC114 min
Sep 25, 6:31 PM EDTSevere Thunderstorm WarningGRR44 min
Oct 12, 3:42 PM EDTFrost AdvisoryGRR17 hr
Oct 13, 4:03 PM EDTFrost AdvisoryGRR16 hr
Oct 17, 3:52 AM EDTFreeze WarningGRR30 hr
Oct 20, 11:58 AM EDTWind AdvisoryGRR8 hr
Oct 28, 11:25 AM EDTSpecial Weather StatementGRR2 hr
Nov 8, 1:55 AM ESTWinter Weather AdvisoryGRR56 hr
Nov 15, 3:11 PM ESTSpecial Weather StatementGRR3 hr
Nov 15, 5:27 PM ESTWinter Weather AdvisoryGRR17 hr
Nov 24, 3:45 AM ESTWinter Storm WatchGRR11 hr
Nov 24, 2:41 PM ESTWinter Weather AdvisoryGRR46 hr
Dec 14, 6:15 PM ESTDense Fog AdvisoryGRR15 hr
Dec 16, 5:13 AM ESTFreezing Fog AdvisoryGRR8 hr
Dec 30, 3:13 PM ESTWinter Weather AdvisoryGRR36 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 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.