Alert archive / Wisconsin / Milwaukee County

Weather alerts in Milwaukee County, Wisconsin, 2020

131 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Milwaukee County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts
131
Warnings
23
Watches
14
Advisories
49
Busiest month
July22 alerts
Busiest day
July 9, 20206 alerts

Over time

By month

Warning verification

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

Milwaukee County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings9633%1974%13 min
Flash flood warnings220%9100%119 min

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Milwaukee, WI: tornado warnings13377%580%16 min
NWS Milwaukee, WI: severe thunderstorm warnings925441%21478%26 min
NWS Milwaukee, WI: flash flood warnings11827%2186%104 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 9, 3:20 AM CSTLakeshore Flood WatchMKX34 hr
Jan 9, 3:09 PM CSTWinter Storm WatchMKX23 hr
Jan 10, 3:04 AM CSTWinter Storm WarningMKX44 hr
Jan 10, 1:41 PM CSTLakeshore Flood AdvisoryMKX33 hr
Jan 16, 2:08 PM CSTWinter Weather AdvisoryMKX52 hr
Feb 3, 3:04 AM CSTLakeshore Flood AdvisoryMKX39 hr
Feb 8, 3:27 AM CSTWinter Weather AdvisoryMKX40 hr
Feb 9, 10:56 AM CSTMesoscale DiscussionSPC5 hr
Feb 13, 2:29 PM CSTWind Chill AdvisoryMKX20 hr
Feb 23, 2:03 PM CSTWinter Storm WatchMKX24 hr
Feb 25, 2:40 AM CSTLakeshore Flood AdvisoryMKX27 hr
Mar 5, 5:41 PM CSTWind AdvisoryMKX12 hr
Mar 23, 5:17 AM CDTDense Fog AdvisoryMKX5 hr
Mar 24, 10:19 PM CDTDense Fog AdvisoryMKX9 hr
Mar 28, 1:44 PM CDTDense Fog AdvisoryMKX8 hr
Apr 7, 3:06 PM CDTMesoscale DiscussionSPC114 min
Apr 7, 3:55 PM CDTSevere Thunderstorm WatchSPC5 hr
Apr 7, 5:07 PM CDTMesoscale DiscussionSPC83 min
Apr 7, 5:26 PM CDTSevere Thunderstorm WarningMKX18 min
Apr 8, 12:30 AM CDTDense Fog AdvisoryMKX10 hr
Apr 12, 2:34 PM CDTWind AdvisoryMKX25 hr
Apr 20, 6:15 PM CDTSpecial Weather StatementMKX90 min
Apr 20, 8:36 PM CDTSpecial Weather StatementMKX54 min
Apr 20, 9:14 PM CDTSpecial Weather StatementMKX61 min
Apr 20, 9:35 PM CDTSevere Thunderstorm WarningMKX25 min
Apr 27, 11:19 PM CDTDense Fog AdvisoryMKX11 hr
Apr 29, 2:47 AM CDTDense Fog AdvisoryMKX7 hr
Apr 29, 3:06 AM CDTFlood WatchMKX27 hr
Apr 29, 9:20 AM CDTRiver Flood WarningMKX50 hr
Apr 29, 6:15 PM CDTLakeshore Flood AdvisoryMKX19 hr
Apr 29, 9:55 PM CDTAreal Flood AdvisoryMKX4 hr
May 7, 9:25 AM CDTFreeze WatchMKX18 hr
May 8, 3:53 AM CDTFreeze WarningMKX28 hr
May 11, 2:52 PM CDTFrost AdvisoryMKX17 hr
May 12, 2:29 PM CDTFrost AdvisoryMKX18 hr
May 15, 4:06 AM CDTDense Fog AdvisoryMKX5 hr
May 16, 3:00 AM CDTLakeshore Flood AdvisoryMKX64 hr
May 17, 2:16 AM CDTFlood WatchMKX23 hr
May 17, 9:33 AM CDTRiver Flood WarningMKX46 hr
May 17, 3:43 PM CDTAreal Flood AdvisoryMKX6 hr
May 17, 5:17 PM CDTAreal Flood WarningMKX12 hr
May 17, 6:51 PM CDTRiver Flood WarningMKX20 hr
May 17, 8:23 PM CDTRiver Flood WarningMKX111 min
May 17, 8:30 PM CDTAreal Flood WarningMKX9 hr
May 22, 11:36 PM CDTDense Fog AdvisoryMKX9 hr
May 23, 12:33 PM CDTTornado WatchSPC8 hr
May 23, 2:51 PM CDTMesoscale DiscussionSPC84 min
Jun 2, 5:32 PM CDTMesoscale DiscussionSPC118 min
Jun 2, 5:48 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 2, 8:47 PM CDTSpecial Weather StatementMKX73 min
Jun 2, 9:28 PM CDTMesoscale DiscussionSPC2 hr
Jun 2, 9:33 PM CDTSpecial Weather StatementMKX57 min
Jun 5, 12:26 PM CDTMesoscale DiscussionSPC94 min
Jun 8, 2:59 PM CDTBeach Hazards StatementMKX34 hr
Jun 9, 2:12 PM CDTWind AdvisoryMKX14 hr
Jun 10, 6:04 PM CDTAreal Flood AdvisoryMKX116 min
Jun 11, 3:26 PM CDTMesoscale DiscussionSPC94 min
Jun 11, 5:12 PM CDTSevere Thunderstorm WarningMKX37 min
Jun 20, 11:30 AM CDTSpecial Weather StatementMKX45 min
Jun 20, 12:10 PM CDTSevere Thunderstorm WarningMKX26 min
Jun 26, 12:38 PM CDTMesoscale DiscussionSPC2 hr
Jun 26, 1:38 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 29, 3:22 PM CDTSpecial Weather StatementMKX53 min
Jun 29, 4:10 PM CDTSpecial Weather StatementMKX65 min
Jun 29, 5:11 PM CDTAreal Flood AdvisoryMKX3 hr
Jun 29, 5:12 PM CDTSpecial Weather StatementMKX33 min
Jul 5, 3:19 PM CDTAreal Flood AdvisoryMKX90 min
Jul 7, 6:29 PM CDTAreal Flood AdvisoryMKX2 hr
Jul 7, 7:45 PM CDTAreal Flood AdvisoryMKX2 hr
Jul 9, 2:49 PM CDTAreal Flood AdvisoryMKX79 min
Jul 9, 2:51 PM CDTMesoscale DiscussionSPC114 min
Jul 9, 3:39 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 9, 5:39 PM CDTMesoscale DiscussionSPC96 min
Jul 9, 6:40 PM CDTSpecial Weather StatementMKX35 min
Jul 9, 6:52 PM CDTSevere Thunderstorm WarningMKX53 min
Jul 9, 7:24 PM CDTSevere Thunderstorm WarningMKX66 min
Jul 9, 7:34 PM CDTAreal Flood AdvisoryMKX3 hr
Jul 11, 5:09 PM CDTBeach Hazards StatementMKX29 hr
Jul 15, 12:40 AM CDTSpecial Weather StatementMKX50 min
Jul 15, 4:53 PM CDTAreal Flood AdvisoryMKX3 hr
Jul 15, 6:47 PM CDTAreal Flood AdvisoryMKX5 hr
Jul 17, 2:54 AM CDTHeat AdvisoryMKX41 hr
Jul 18, 12:38 PM CDTSpecial Weather StatementMKX37 min
Jul 18, 12:43 PM CDTSpecial Weather StatementMKX32 min
Jul 18, 12:57 PM CDTSevere Thunderstorm WarningMKX18 min
Jul 26, 2:37 AM CDTHeat AdvisoryMKX16 hr
Jul 26, 5:33 PM CDTMesoscale DiscussionSPC87 min
Jul 30, 2:53 AM CDTBeach Hazards StatementMKX28 hr
Aug 2, 3:19 PM CDTBeach Hazards StatementMKX46 hr
Aug 2, 3:19 PM CDTLakeshore Flood AdvisoryMKX36 hr
Aug 2, 8:16 PM CDTAreal Flood AdvisoryMKX3 hr
Aug 2, 8:52 PM CDTFlash Flood WarningMKX8 hr
Aug 2, 10:16 PM CDTFlash Flood WarningMKX7 hr
Aug 2, 11:22 PM CDTRiver Flood WarningMKX11 hr
Aug 3, 12:20 PM CDTRiver Flood WarningMKX10 hr
Aug 9, 6:04 PM CDTSevere Thunderstorm WarningMKX41 min
Aug 10, 10:42 AM CDTMesoscale DiscussionSPC93 min
Aug 10, 11:26 AM CDTSevere Thunderstorm Watch PDSSPC7 hr
Aug 10, 3:36 PM CDTMesoscale DiscussionSPC84 min
Aug 10, 4:34 PM CDTAreal Flood AdvisoryMKX3 hr
Aug 23, 6:23 PM CDTAreal Flood AdvisoryMKX114 min
Aug 25, 4:55 AM CDTSpecial Weather StatementMKX35 min
Aug 25, 5:27 AM CDTSpecial Weather StatementMKX48 min
Aug 25, 5:38 AM CDTAreal Flood AdvisoryMKX3 hr
Aug 25, 10:07 AM CDTMesoscale DiscussionSPC113 min
Sep 5, 3:53 PM CDTBeach Hazards StatementMKX35 hr
Sep 6, 6:47 PM CDTMesoscale DiscussionSPC118 min
Sep 7, 2:32 PM CDTBeach Hazards StatementMKX3 days
Sep 7, 2:32 PM CDTLakeshore Flood AdvisoryMKX66 hr
Sep 11, 3:18 AM CDTBeach Hazards StatementMKX41 hr
Sep 16, 3:01 AM CDTBeach Hazards StatementMKX37 hr
Sep 17, 7:49 PM CDTBeach Hazards StatementMKX20 hr
Sep 19, 2:10 PM CDTBeach Hazards StatementMKX53 hr
Oct 1, 3:29 AM CDTFrost AdvisoryMKX30 hr
Oct 4, 9:27 AM CDTFrost AdvisoryMKX23 hr
Oct 15, 2:56 AM CDTFreeze WarningMKX29 hr
Oct 16, 2:21 PM CDTWind AdvisoryMKX29 hr
Oct 22, 6:54 PM CDTDense Fog AdvisoryMKX5 hr
Nov 1, 3:09 AM CSTWind AdvisoryMKX13 hr
Nov 10, 3:09 AM CSTWind AdvisoryMKX25 hr
Nov 10, 1:28 PM CSTMesoscale DiscussionSPC92 min
Nov 10, 2:05 PM CSTTornado WatchSPC6 hr
Nov 10, 3:30 PM CSTMesoscale DiscussionSPC2 hr
Nov 10, 4:35 PM CSTSevere Thunderstorm WarningMKX38 min
Nov 14, 1:08 PM CSTWind AdvisoryMKX32 hr
Dec 10, 2:23 PM CSTLakeshore Flood WatchMKX13 hr
Dec 11, 3:10 AM CSTLakeshore Flood WarningMKX39 hr
Dec 11, 3:21 AM CSTWinter Weather AdvisoryMKX35 hr
Dec 28, 1:49 PM CSTWinter Weather AdvisoryMKX43 hr
Dec 29, 3:52 PM CSTMesoscale DiscussionSPC4 hr
Dec 30, 1:15 AM CSTMesoscale DiscussionSPC6 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 archive20192021

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.