Alert archive / Michigan / Ontonagon County

Weather alerts in Ontonagon County, Michigan, 2009

71 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Ontonagon County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
71
Warnings
22
Watches
11
Advisories
34
Busiest month
December21 alerts
Busiest day
September 27, 20093 alerts

Over time

By month

Warning verification

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

Ontonagon County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings3167%0
Flash flood warnings00

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Marquette, MI: tornado warnings10100%0
NWS Marquette, MI: severe thunderstorm warnings14379%944%13 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 1, 3:51 PM ESTLake Effect Snow AdvisoryMQT31 hr
Jan 2, 4:23 AM ESTWinter Storm WatchMQT24 hr
Jan 2, 9:22 AM ESTLake Effect Snow WarningMQT10 hr
Jan 3, 4:24 AM ESTWinter Storm WarningMQT62 hr
Jan 8, 7:14 AM ESTLake Effect Snow WarningMQT16 hr
Jan 8, 9:28 AM ESTLake Effect Snow AdvisoryMQT29 hr
Jan 12, 4:47 AM ESTWinter Weather AdvisoryMQT35 hr
Jan 13, 4:29 PM ESTWind Chill WatchMQT13 hr
Jan 13, 10:36 PM ESTWind Chill AdvisoryMQT59 hr
Jan 14, 5:02 AM ESTWind Chill WarningMQT55 hr
Jan 17, 6:42 AM ESTLake Effect Snow AdvisoryMQT18 hr
Jan 18, 12:29 AM ESTLake Effect Snow WarningMQT37 hr
Jan 19, 3:34 PM ESTLake Effect Snow WarningMQT17 hr
Jan 22, 5:45 AM ESTWinter Weather AdvisoryMQT3 days
Jan 23, 4:32 AM ESTWind Chill AdvisoryMQT55 hr
Jan 24, 4:02 PM ESTWind Chill AdvisoryMQT44 hr
Jan 31, 2:56 PM ESTWind AdvisoryMQT25 hr
Feb 1, 3:58 PM ESTLake Effect Snow AdvisoryMQT48 hr
Feb 9, 10:53 AM ESTFreezing Rain AdvisoryMQT3 hr
Feb 17, 4:55 AM ESTWinter Weather AdvisoryMQT53 hr
Feb 24, 4:27 PM ESTWinter Storm WatchMQT36 hr
Feb 26, 4:53 AM ESTWinter Storm WarningMQT24 hr
Feb 26, 4:53 AM ESTWinter Weather AdvisoryMQT36 hr
Mar 8, 4:41 PM EDTWinter Storm WatchMQT36 hr
Mar 10, 4:35 AM EDTWinter Storm WarningMQT36 hr
Mar 20, 10:33 PM EDTWinter Weather AdvisoryMQT10 hr
Mar 30, 3:54 PM EDTWinter Weather AdvisoryMQT24 hr
Apr 19, 3:58 PM EDTWinter Storm WarningMQT52 hr
Apr 19, 3:58 PM EDTWinter Weather AdvisoryMQT46 hr
Apr 24, 8:42 PM EDTMesoscale DiscussionSPC63 min
May 19, 3:11 PM EDTRed Flag WarningMQT31 hr
May 20, 9:04 AM EDTWind AdvisoryMQT13 hr
May 24, 2:25 PM EDTFrost AdvisoryMQT17 hr
May 25, 12:39 PM EDTRed Flag WarningMQT8 hr
May 29, 4:18 PM EDTFreeze WatchMQT12 hr
May 30, 3:59 AM EDTFreeze WarningMQT27 hr
Jun 2, 3:37 PM EDTFreeze WarningMQT15 hr
Jun 3, 4:11 PM EDTFrost AdvisoryMQT16 hr
Jun 3, 4:11 PM EDTFire Weather WatchMQT17 hr
Jun 5, 4:19 PM EDTFrost AdvisoryMQT15 hr
Jun 13, 3:58 PM EDTSevere Thunderstorm WarningMQT62 min
Aug 9, 2:01 AM EDTSevere Thunderstorm WarningMQT44 min
Aug 9, 2:38 AM EDTSevere Thunderstorm WarningMQT67 min
Aug 30, 4:14 AM EDTFrost AdvisoryMQT28 hr
Sep 27, 5:34 AM EDTLakeshore Flood StatementMQT4 days
Sep 27, 3:54 PM EDTWind AdvisoryMQT36 hr
Sep 27, 4:00 PM EDTMesoscale DiscussionSPC2 hr
Sep 28, 4:28 PM EDTFreeze WatchMQT11 hr
Sep 29, 3:39 AM EDTFreeze WarningMQT29 hr
Oct 23, 5:15 AM EDTWinter Weather AdvisoryMQT27 hr
Dec 2, 4:35 AM ESTWinter Weather AdvisoryMQT12 hr
Dec 2, 4:15 PM ESTLake Effect Snow AdvisoryMQT42 hr
Dec 3, 4:14 AM ESTLake Effect Snow WatchMQT13 hr
Dec 3, 5:05 PM ESTLake Effect Snow WarningMQT28 hr
Dec 5, 4:23 AM ESTLake Effect Snow AdvisoryMQT25 hr
Dec 6, 4:45 PM ESTWinter Storm WatchMQT24 hr
Dec 7, 4:43 AM ESTLake Effect Snow AdvisoryMQT26 hr
Dec 7, 4:18 PM ESTWinter Storm WarningMQT60 hr
Dec 8, 4:55 AM ESTLakeshore Flood StatementMQT51 hr
Dec 10, 4:38 AM ESTLake Effect Snow WarningMQT47 hr
Dec 10, 4:38 AM ESTLake Effect Snow AdvisoryMQT16 hr
Dec 10, 4:51 AM ESTWind Chill AdvisoryMQT30 hr
Dec 11, 4:26 AM ESTLake Effect Snow AdvisoryMQT7 hr
Dec 14, 4:28 PM ESTLake Effect Snow AdvisoryMQT42 hr
Dec 21, 2:20 PM ESTLake Effect Snow AdvisoryMQT7 hr
Dec 22, 4:38 PM ESTWinter Storm WatchMQT24 hr
Dec 23, 4:32 PM ESTWinter Weather AdvisoryMQT53 hr
Dec 24, 12:01 PM ESTWinter Storm WarningMQT23 hr
Dec 27, 3:55 PM ESTLake Effect Snow AdvisoryMQT39 hr
Dec 30, 4:25 AM ESTLake Effect Snow WatchMQT11 hr
Dec 30, 3:50 PM ESTLake Effect Snow WarningMQT63 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 archive20082010

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.