Alert archive / Wisconsin / Rock County

Weather alerts in Rock County, Wisconsin, 2020

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

Rock County and its neighbors

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

Alerts
107
Warnings
22
Watches
16
Advisories
36
Busiest month
August17 alerts
Busiest day
May 23, 20209 alerts

Over time

By month

Warning verification

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

2 of 4 tornado warnings covering Rock County in 2020 had a tornado report inside them; 3 of 3 tornado reports fell inside a warning, on average 20 minutes after it went out.

Rock County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4250%3100%20 min
Severe thunderstorm warnings10730%7100%20 min
Flash flood warnings2150%1100%63 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, 3:09 PM CSTWinter Storm WatchMKX23 hr
Jan 10, 3:04 AM CSTWinter Storm WarningMKX44 hr
Jan 10, 5:50 PM CSTMesoscale DiscussionSPC6 hr
Jan 14, 2:02 PM CSTWinter Weather AdvisoryMKX22 hr
Jan 16, 2:08 PM CSTWinter Weather AdvisoryMKX52 hr
Jan 18, 3:10 PM CSTWind Chill AdvisoryMKX19 hr
Jan 24, 3:12 AM CSTWinter Weather AdvisoryMKX33 hr
Feb 8, 3:27 AM CSTWinter Weather AdvisoryMKX40 hr
Feb 13, 2:29 PM CSTWind Chill AdvisoryMKX20 hr
Feb 16, 2:55 PM CSTWinter Weather AdvisoryMKX33 hr
Feb 23, 2:03 PM CSTWinter Storm WatchMKX24 hr
Mar 5, 5:41 PM CSTWind AdvisoryMKX12 hr
Mar 9, 10:51 AM CDTRiver Flood WatchMKX35 hr
Mar 19, 10:51 AM CDTRiver Flood WatchMKX3 days
Mar 19, 10:51 AM CDTRiver Flood WatchMKX21 days
Mar 20, 10:47 AM CDTRiver Flood WatchMKX21 days
Mar 20, 12:06 PM CDTRiver Flood WarningMKX21 days
Mar 23, 5:17 AM CDTDense Fog AdvisoryMKX5 hr
Mar 29, 10:07 AM CDTRiver Flood WarningMKX27 hr
Mar 29, 3:55 PM CDTRiver Flood WatchMKX5 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 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 27, 11:19 PM CDTDense Fog AdvisoryMKX11 hr
Apr 29, 2:47 AM CDTDense Fog AdvisoryMKX7 hr
May 7, 9:25 AM CDTFreeze WatchMKX18 hr
May 8, 3:53 AM CDTFreeze WarningMKX28 hr
May 10, 3:32 PM CDTFrost AdvisoryMKX16 hr
May 11, 2:52 PM CDTFrost AdvisoryMKX17 hr
May 15, 4:06 AM CDTDense Fog AdvisoryMKX5 hr
May 23, 12:33 PM CDTTornado WatchSPC8 hr
May 23, 2:51 PM CDTMesoscale DiscussionSPC84 min
May 23, 3:23 PM CDTSevere Thunderstorm WarningMKX52 min
May 23, 4:04 PM CDTTornado WarningMKX25 min
May 23, 4:28 PM CDTSevere Thunderstorm WarningMKX47 min
May 23, 4:50 PM CDTTornado Warning Tornado observedMKX40 min
May 23, 5:12 PM CDTAreal Flood AdvisoryMKX28 min
May 23, 5:15 PM CDTTornado Warning Tornado observedMKX31 min
May 23, 5:39 PM CDTFlash Flood WarningMKX3 hr
Jun 2, 5:32 PM CDTMesoscale DiscussionSPC118 min
Jun 2, 5:48 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 2, 8:39 PM CDTSpecial Weather StatementMKX66 min
Jun 5, 12:26 PM CDTMesoscale DiscussionSPC94 min
Jun 9, 2:12 PM CDTWind AdvisoryMKX14 hr
Jun 26, 12:38 PM CDTMesoscale DiscussionSPC2 hr
Jun 26, 1:38 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 26, 3:39 PM CDTMesoscale DiscussionSPC2 hr
Jun 29, 1:35 PM CDTSevere Thunderstorm WarningMKX40 min
Jun 29, 1:59 PM CDTSpecial Weather StatementMKX46 min
Jun 29, 2:33 PM CDTAreal Flood AdvisoryMKX117 min
Jun 29, 2:43 PM CDTSpecial Weather StatementMKX47 min
Jun 29, 3:22 PM CDTSpecial Weather StatementMKX53 min
Jun 29, 3:32 PM CDTFlash Flood WarningMKX3 hr
Jun 29, 4:10 PM CDTSpecial Weather StatementMKX65 min
Jul 7, 5:25 PM CDTSpecial Weather StatementMKX65 min
Jul 7, 6:06 PM CDTSpecial Weather StatementMKX54 min
Jul 7, 6:10 PM CDTAreal Flood AdvisoryMKX2 hr
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, 6:18 PM CDTAreal Flood AdvisoryMKX3 hr
Jul 9, 6:19 PM CDTSpecial Weather StatementMKX41 min
Jul 9, 6:31 PM CDTSevere Thunderstorm WarningMKX44 min
Jul 15, 1:43 AM CDTSevere Thunderstorm WarningMKX19 min
Jul 17, 2:54 AM CDTHeat AdvisoryMKX41 hr
Jul 18, 11:00 AM CDTMesoscale DiscussionSPC2 hr
Jul 26, 2:37 AM CDTHeat AdvisoryMKX16 hr
Jul 26, 5:33 PM CDTMesoscale DiscussionSPC87 min
Jul 26, 6:39 PM CDTAreal Flood AdvisoryMKX74 min
Aug 9, 1:30 PM CDTMesoscale DiscussionSPC2 hr
Aug 9, 3:41 PM CDTSpecial Weather StatementMKX64 min
Aug 9, 4:45 PM CDTSpecial Weather StatementMKX60 min
Aug 9, 5:24 PM CDTSpecial Weather StatementMKX36 min
Aug 10, 10:42 AM CDTMesoscale DiscussionSPC93 min
Aug 10, 11:26 AM CDTSevere Thunderstorm Watch PDSSPC7 hr
Aug 10, 1:36 PM CDTMesoscale DiscussionSPC114 min
Aug 10, 2:26 PM CDTTornado WarningMKX17 min
Aug 10, 2:29 PM CDTSevere Thunderstorm WarningMKX61 min
Aug 10, 3:13 PM CDTAreal Flood AdvisoryMKX3 hr
Aug 10, 3:13 PM CDTSevere Thunderstorm WarningMKX47 min
Aug 10, 3:37 PM CDTSpecial Weather StatementMKX38 min
Aug 10, 4:34 PM CDTAreal Flood AdvisoryMKX3 hr
Aug 15, 9:34 AM CDTSpecial Weather StatementMKX41 min
Aug 24, 10:55 PM CDTMesoscale DiscussionSPC2 hr
Aug 25, 12:29 AM CDTSevere Thunderstorm WarningMKX46 min
Aug 25, 1:16 AM CDTSevere Thunderstorm WarningMKX44 min
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, 4:53 PM CDTMesoscale DiscussionSPC2 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, 3:38 PM CSTSevere Thunderstorm WarningMKX82 min
Nov 14, 1:08 PM CSTWind AdvisoryMKX32 hr
Nov 23, 1:44 PM CSTWinter Weather AdvisoryMKX22 hr
Nov 24, 8:22 PM CSTDense Fog AdvisoryMKX14 hr
Dec 11, 3:21 AM CSTWinter Weather AdvisoryMKX35 hr
Dec 28, 4:19 AM CSTWinter Storm WatchMKX10 hr
Dec 28, 1:49 PM CSTWinter Storm WarningMKX40 hr
Dec 29, 2:17 PM CSTMesoscale DiscussionSPC4 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.