Alert archive / Michigan / Ionia County

Weather alerts in Ionia County, Michigan, 2017

88 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts
88
Warnings
10
Watches
11
Advisories
48
Busiest month
April15 alerts
Busiest day
April 11, 20174 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 1 tornado warnings covering Ionia County in 2017 had a tornado report inside them.

Ionia County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings110%0
Severe thunderstorm warnings4175%0
Flash flood warnings00

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Grand Rapids, MI: tornado warnings110%250%1 min
NWS Grand Rapids, MI: severe thunderstorm warnings291259%4883%19 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, 10:01 AM ESTDense Fog AdvisoryGRR5 hr
Jan 3, 10:30 AM ESTRiver Flood AdvisoryGRR6 days
Jan 8, 7:45 AM ESTRiver Flood AdvisoryGRR4 days
Jan 9, 12:45 PM ESTWinter Weather AdvisoryGRR28 hr
Jan 9, 8:56 PM ESTRiver Flood AdvisoryGRR24 days
Jan 10, 3:30 AM ESTHigh Wind WatchGRR11 hr
Jan 10, 2:24 PM ESTWind AdvisoryGRR13 hr
Jan 12, 10:52 PM ESTRiver Flood AdvisoryGRR5 days
Jan 16, 3:34 AM ESTFreezing Rain AdvisoryGRR24 hr
Jan 20, 4:28 PM ESTDense Fog AdvisoryGRR14 hr
Jan 21, 4:09 PM ESTDense Fog AdvisoryGRR36 hr
Jan 30, 3:43 AM ESTWinter Weather AdvisoryGRR30 hr
Feb 6, 8:28 PM ESTRiver Flood AdvisoryGRR8 days
Feb 7, 3:27 AM ESTDense Fog AdvisoryGRR7 hr
Feb 12, 1:58 AM ESTWind AdvisoryGRR18 hr
Feb 14, 12:06 PM ESTWinter Weather AdvisoryGRR15 hr
Feb 21, 8:36 PM ESTDense Fog AdvisoryGRR12 hr
Feb 24, 8:35 AM ESTSpecial Weather StatementGRR55 min
Feb 24, 9:00 PM ESTRiver Flood AdvisoryGRR14 days
Feb 28, 11:22 AM ESTRiver Flood AdvisoryGRR5 days
Mar 7, 3:30 AM ESTHigh Wind WatchGRR11 hr
Mar 7, 3:38 AM ESTSpecial Weather StatementGRR3 hr
Mar 7, 2:51 PM ESTHigh Wind WarningGRR28 hr
Mar 12, 1:57 AM ESTWinter Weather AdvisoryGRR40 hr
Mar 16, 3:36 PM EDTWinter Weather AdvisoryGRR24 hr
Mar 17, 4:05 AM EDTWinter Weather AdvisoryGRR11 hr
Mar 24, 11:29 AM EDTRiver Flood AdvisoryGRR13 days
Apr 4, 3:58 PM EDTWinter Storm WatchGRR24 hr
Apr 5, 11:47 AM EDTRiver Flood AdvisoryGRR7 days
Apr 5, 3:47 PM EDTWinter Weather AdvisoryGRR24 hr
Apr 6, 10:21 PM EDTRiver Flood WarningGRR5 days
Apr 6, 10:56 PM EDTRiver Flood AdvisoryGRR4 days
Apr 10, 2:48 PM EDTSevere Thunderstorm WatchSPC8 hr
Apr 10, 7:22 PM EDTMesoscale DiscussionSPC53 min
Apr 10, 8:37 PM EDTTornado WarningGRR23 min
Apr 10, 9:03 PM EDTAreal Flood AdvisoryGRR6 hr
Apr 10, 9:58 PM EDTMesoscale DiscussionSPC62 min
Apr 11, 4:25 PM EDTRiver Flood AdvisoryGRR29 days
Apr 11, 11:16 PM EDTRiver Flood AdvisoryGRR36 hr
Apr 20, 5:30 AM EDTSpecial Weather StatementGRR30 min
Apr 28, 4:03 PM EDTFlood WatchGRR63 hr
Apr 30, 10:54 AM EDTRiver Flood AdvisoryGRR6 days
May 6, 2:55 PM EDTFreeze WatchGRR13 hr
May 7, 3:41 AM EDTFreeze WarningGRR29 hr
May 8, 9:53 AM EDTFreeze WarningGRR22 hr
May 18, 3:15 AM EDTWind AdvisoryGRR17 hr
May 21, 7:09 AM EDTSpecial Weather StatementGRR66 min
Jun 12, 9:09 PM EDTSevere Thunderstorm WatchSPC5 hr
Jun 12, 10:30 PM EDTMesoscale DiscussionSPC90 min
Jun 14, 4:02 PM EDTMesoscale DiscussionSPC118 min
Jun 14, 5:59 PM EDTMesoscale DiscussionSPC91 min
Jun 16, 4:59 AM EDTSpecial Weather StatementGRR61 min
Jun 17, 5:40 AM EDTSpecial Weather StatementGRR50 min
Jun 18, 12:44 AM EDTAreal Flood AdvisoryGRR3 hr
Jun 18, 9:52 PM EDTRiver Flood AdvisoryGRR5 days
Jun 22, 9:53 PM EDTFlood WatchGRR6 hr
Jun 26, 5:17 PM EDTSpecial Weather StatementGRR3 hr
Jul 7, 2:58 AM EDTSevere Thunderstorm WarningGRR47 min
Jul 7, 3:24 AM EDTSevere Thunderstorm WarningGRR36 min
Jul 7, 3:35 AM EDTMesoscale DiscussionSPC115 min
Jul 7, 3:42 AM EDTSevere Thunderstorm WarningGRR33 min
Jul 12, 1:09 AM EDTFlood WatchGRR29 hr
Jul 13, 3:19 AM EDTMesoscale DiscussionSPC3 hr
Aug 3, 3:06 PM EDTSevere Thunderstorm WarningGRR39 min
Aug 17, 1:46 PM EDTSpecial Weather StatementGRR89 min
Aug 29, 7:22 AM EDTDense Fog AdvisoryGRR3 hr
Aug 29, 3:30 PM EDTDense Fog AdvisoryGRR19 hr
Sep 14, 2:34 AM EDTDense Fog AdvisoryGRR6 hr
Sep 21, 6:10 PM EDTSpecial Weather StatementGRR65 min
Oct 7, 7:59 PM EDTSpecial Weather StatementGRR61 min
Oct 14, 3:14 AM EDTFlood WatchGRR24 hr
Oct 14, 11:37 AM EDTWind AdvisoryGRR28 hr
Oct 14, 10:34 PM EDTRiver Flood AdvisoryGRR37 hr
Oct 22, 3:27 AM EDTFlood WatchGRR36 hr
Oct 23, 11:47 AM EDTRiver Flood AdvisoryGRR7 days
Oct 23, 11:47 AM EDTRiver Flood AdvisoryGRR7 days
Oct 23, 2:36 PM EDTAreal Flood AdvisoryGRR42 hr
Nov 17, 10:20 AM ESTRiver Flood AdvisoryGRR7 days
Dec 4, 3:51 PM ESTWind AdvisoryGRR27 hr
Dec 4, 10:52 PM ESTSpecial Weather StatementGRR83 min
Dec 11, 3:41 AM ESTWinter Weather AdvisoryGRR30 hr
Dec 12, 3:45 PM ESTWinter Weather AdvisoryGRR31 hr
Dec 13, 3:51 AM ESTWinter Storm WarningGRR19 hr
Dec 15, 9:16 PM ESTWinter Weather AdvisoryGRR13 hr
Dec 21, 11:41 AM ESTWinter Weather AdvisoryGRR24 hr
Dec 23, 3:44 PM ESTWinter Weather AdvisoryGRR63 hr
Dec 25, 1:52 PM ESTSpecial Weather StatementGRR3 hr
Dec 27, 9:11 AM ESTRiver Flood AdvisoryGRR52 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 archive20162018

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.