Alert archive / Michigan / Oakland County

Weather alerts in Oakland County, Michigan, 2009

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

Oakland County and its neighbors

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

Alerts
85
Warnings
18
Watches
18
Advisories
30
Busiest month
June16 alerts
Busiest day
April 25, 20098 alerts

Over time

By month

Warning verification

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

Oakland County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings9633%16100%29 min
Flash flood warnings220%1100%6 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Detroit, MI: tornado warnings50100%0
NWS Detroit, MI: severe thunderstorm warnings492843%9682%30 min
NWS Detroit, MI: flash flood warnings6517%1164%85 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, 3:42 PM ESTFreezing Rain AdvisoryDTX22 hr
Jan 4, 6:56 AM ESTMesoscale DiscussionSPC3 hr
Jan 6, 9:50 PM ESTWinter Weather AdvisoryDTX10 hr
Jan 8, 3:07 PM ESTWinter Storm WatchDTX13 hr
Jan 9, 4:29 AM ESTWinter Storm WarningDTX42 hr
Jan 9, 4:29 AM ESTWinter Weather AdvisoryDTX23 hr
Jan 12, 4:01 PM ESTWinter Weather AdvisoryDTX19 hr
Jan 14, 11:46 AM ESTWind Chill WatchDTX39 hr
Jan 14, 11:46 AM ESTWind Chill AdvisoryDTX67 hr
Jan 15, 10:39 AM ESTWind Chill WarningDTX44 hr
Jan 17, 4:23 AM ESTWinter Weather AdvisoryDTX25 hr
Jan 27, 3:32 AM ESTWinter Weather AdvisoryDTX33 hr
Feb 4, 3:38 AM ESTWind Chill AdvisoryDTX31 hr
Feb 10, 3:52 PM ESTFlood WatchDTX36 hr
Feb 11, 4:28 AM ESTWind AdvisoryDTX27 hr
Feb 11, 5:11 AM ESTDense Fog AdvisoryDTX7 hr
Feb 19, 3:41 PM ESTWinter Storm WatchDTX24 hr
Feb 20, 3:34 PM ESTWinter Storm WarningDTX25 hr
Feb 21, 6:35 AM ESTMesoscale DiscussionSPC5 hr
Mar 6, 4:30 PM ESTFlood WatchDTX35 hr
Mar 8, 4:36 AM EDTAreal Flood AdvisoryDTX18 hr
Mar 9, 4:05 PM EDTFlood WatchDTX35 hr
Mar 10, 4:28 AM EDTHigh Wind WatchDTX11 hr
Mar 10, 3:51 PM EDTWind AdvisoryDTX24 hr
Apr 2, 9:02 PM EDTMesoscale DiscussionSPC118 min
Apr 4, 4:03 PM EDTWinter Storm WatchDTX23 hr
Apr 5, 3:04 PM EDTWinter Storm WarningDTX17 hr
Apr 6, 2:04 AM EDTMesoscale DiscussionSPC4 hr
Apr 20, 9:53 PM EDTAreal Flood AdvisoryDTX6 hr
Apr 25, 10:44 AM EDTSevere Thunderstorm WatchSPC5 hr
Apr 25, 11:55 AM EDTMesoscale DiscussionSPC95 min
Apr 25, 1:06 PM EDTMesoscale DiscussionSPC84 min
Apr 25, 1:37 PM EDTSevere Thunderstorm WarningDTX53 min
Apr 25, 2:55 PM EDTMesoscale DiscussionSPC95 min
Apr 25, 3:39 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 25, 5:59 PM EDTSevere Thunderstorm WarningDTX68 min
Apr 25, 7:15 PM EDTMesoscale DiscussionSPC60 min
Apr 25, 9:07 PM EDTAreal Flood AdvisoryDTX11 hr
Apr 27, 3:57 PM EDTFlood WatchDTX15 hr
May 10, 3:53 AM EDTFrost AdvisoryDTX28 hr
May 11, 1:33 PM EDTFrost AdvisoryDTX18 hr
May 14, 1:42 AM EDTSevere Thunderstorm WatchSPC4 hr
May 17, 3:20 PM EDTFrost AdvisoryDTX17 hr
May 27, 4:25 PM EDTSevere Thunderstorm WarningDTX43 min
May 28, 4:03 AM EDTDense Fog AdvisoryDTX5 hr
Jun 8, 3:34 PM EDTMesoscale DiscussionSPC56 min
Jun 8, 4:02 PM EDTTornado WatchSPC6 hr
Jun 8, 6:46 PM EDTMesoscale DiscussionSPC59 min
Jun 8, 8:40 PM EDTSevere Thunderstorm WarningDTX52 min
Jun 19, 2:57 AM EDTFlash Flood WatchDTX25 hr
Jun 19, 7:04 PM EDTMesoscale DiscussionSPC86 min
Jun 19, 9:57 PM EDTMesoscale DiscussionSPC63 min
Jun 19, 10:47 PM EDTFlash Flood WarningDTX5 hr
Jun 24, 3:51 AM EDTHeat AdvisoryDTX16 hr
Jun 25, 1:30 PM EDTMesoscale DiscussionSPC60 min
Jun 25, 2:08 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 25, 2:26 PM EDTSevere Thunderstorm WarningDTX64 min
Jun 25, 3:19 PM EDTSevere Thunderstorm WarningDTX56 min
Jun 25, 4:12 PM EDTMesoscale DiscussionSPC63 min
Jun 25, 4:21 PM EDTFlash Flood WarningDTX3 hr
Jun 25, 7:09 PM EDTMesoscale DiscussionSPC96 min
Aug 9, 1:45 AM EDTSevere Thunderstorm WarningDTX50 min
Aug 9, 2:05 AM EDTAreal Flood AdvisoryDTX3 hr
Aug 9, 5:18 PM EDTMesoscale DiscussionSPC57 min
Aug 9, 5:48 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 9, 7:33 PM EDTSevere Thunderstorm WarningDTX72 min
Aug 9, 8:46 PM EDTSevere Thunderstorm WarningDTX49 min
Aug 19, 9:18 PM EDTMesoscale DiscussionSPC57 min
Aug 20, 2:00 PM EDTMesoscale DiscussionSPC60 min
Sep 27, 3:44 PM EDTWind AdvisoryDTX30 hr
Sep 27, 10:46 PM EDTSevere Thunderstorm WatchSPC4 hr
Sep 30, 4:40 AM EDTFrost AdvisoryDTX11 hr
Sep 30, 4:40 AM EDTFreeze WarningDTX27 hr
Oct 7, 2:04 AM EDTWind AdvisoryDTX8 hr
Oct 10, 4:06 AM EDTFreeze WarningDTX29 hr
Oct 29, 5:16 AM EDTDense Fog AdvisoryDTX6 hr
Oct 30, 4:11 PM EDTWind AdvisoryDTX20 hr
Nov 21, 9:34 PM ESTDense Fog AdvisoryDTX12 hr
Dec 8, 4:41 AM ESTWinter Weather AdvisoryDTX29 hr
Dec 8, 3:36 PM ESTHigh Wind WatchDTX13 hr
Dec 9, 12:09 AM ESTMesoscale DiscussionSPC6 hr
Dec 9, 4:10 AM ESTHigh Wind WarningDTX16 hr
Dec 9, 3:50 PM ESTWinter Weather AdvisoryDTX14 hr
Dec 9, 8:18 PM ESTWind AdvisoryDTX2 hr
Dec 24, 4:30 PM ESTWinter Weather AdvisoryDTX20 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.