Alert archive / Wisconsin / Jefferson County

Weather alerts in Jefferson County, Wisconsin, 2015

82 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Jefferson County and its neighbors

Each county as a circle sized by its count in 2015. Tap one for its archive.

Alerts
82
Warnings
16
Watches
15
Advisories
23
Busiest month
July13 alerts
Busiest day
July 18, 20157 alerts

Over time

By month

Warning verification

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

Jefferson County, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings9811%956%30 min
Flash flood warnings2150%1100%9 min

Each office's whole area, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Milwaukee, WI: tornado warnings9278%729%9 min
NWS Milwaukee, WI: severe thunderstorm warnings744046%19473%24 min
NWS Milwaukee, WI: flash flood warnings6267%743%77 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 2, 3:14 PM CSTWinter Weather AdvisoryMKX25 hr
Jan 4, 3:30 AM CSTWind Chill AdvisoryMKX33 hr
Jan 6, 2:59 AM CSTWind Chill AdvisoryMKX57 hr
Jan 7, 1:17 PM CSTWinter Weather AdvisoryMKX38 hr
Jan 8, 2:12 PM CSTWind Chill AdvisoryMKX44 hr
Jan 31, 4:17 AM CSTWinter Storm WarningMKX47 hr
Jan 31, 4:17 AM CSTWinter Weather AdvisoryMKX43 hr
Feb 3, 3:37 AM CSTWinter Weather AdvisoryMKX17 hr
Feb 13, 1:58 PM CSTWind Chill AdvisoryMKX43 hr
Feb 18, 11:32 AM CSTWind Chill AdvisoryMKX24 hr
Feb 19, 3:00 PM CSTWind Chill AdvisoryMKX18 hr
Feb 22, 3:12 AM CSTWind Chill AdvisoryMKX31 hr
Mar 2, 4:07 AM CSTWinter Weather AdvisoryMKX34 hr
Mar 10, 2:55 AM CDTDense Fog AdvisoryMKX9 hr
Mar 29, 6:48 AM CDTFreezing Rain AdvisoryMKX4 hr
Apr 8, 11:13 PM CDTSpecial Weather StatementMKX62 min
Apr 9, 1:01 AM CDTSpecial Weather StatementMKX59 min
Apr 9, 1:19 AM CDTSpecial Weather StatementMKX26 min
Apr 9, 1:48 PM CDTTornado WatchSPC9 hr
Apr 9, 5:32 PM CDTSpecial Weather StatementMKX28 min
Apr 9, 10:35 PM CDTWind AdvisoryMKX5 hr
May 3, 11:39 PM CDTSevere Thunderstorm WarningMKX36 min
May 4, 12:59 AM CDTSpecial Weather StatementMKX61 min
May 12, 3:36 AM CDTFrost AdvisoryMKX27 hr
May 26, 11:22 AM CDTMesoscale DiscussionSPC113 min
Jun 8, 5:54 PM CDTSpecial Weather StatementMKX51 min
Jun 11, 3:12 PM CDTFlood WatchMKX11 hr
Jun 22, 9:14 AM CDTMesoscale DiscussionSPC61 min
Jun 22, 9:39 AM CDTSevere Thunderstorm WatchSPC3 hr
Jun 22, 9:58 AM CDTSevere Thunderstorm WarningMKX62 min
Jun 22, 10:38 AM CDTSevere Thunderstorm WarningMKX53 min
Jun 29, 8:18 PM CDTSpecial Weather StatementMKX27 min
Jun 29, 8:42 PM CDTSpecial Weather StatementMKX33 min
Jul 13, 3:52 AM CDTSevere Thunderstorm WarningMKX53 min
Jul 13, 4:14 AM CDTSevere Thunderstorm WatchSPC6 hr
Jul 13, 3:11 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 13, 6:09 PM CDTMesoscale DiscussionSPC66 min
Jul 13, 7:15 PM CDTSevere Thunderstorm WarningMKX45 min
Jul 17, 2:16 PM CDTHeat AdvisoryMKX21 hr
Jul 18, 3:56 AM CDTSevere Thunderstorm WatchSPC4 hr
Jul 18, 5:47 AM CDTSpecial Weather StatementMKX58 min
Jul 18, 12:31 PM CDTMesoscale DiscussionSPC119 min
Jul 18, 1:31 PM CDTTornado WatchSPC5 hr
Jul 18, 1:49 PM CDTSpecial Weather StatementMKX41 min
Jul 18, 1:59 PM CDTSevere Thunderstorm WarningMKX31 min
Jul 18, 2:24 PM CDTSevere Thunderstorm WarningMKX51 min
Aug 2, 2:00 PM CDTMesoscale DiscussionSPC2 hr
Aug 2, 2:59 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 14, 7:14 PM CDTSevere Thunderstorm WarningMKX46 min
Aug 15, 1:43 PM CDTMesoscale DiscussionSPC2 hr
Aug 18, 1:35 PM CDTTornado WatchSPC8 hr
Aug 18, 3:53 PM CDTMesoscale DiscussionSPC2 hr
Aug 18, 8:00 PM CDTMesoscale DiscussionSPC90 min
Sep 7, 2:43 AM CDTSpecial Weather StatementMKX47 min
Sep 7, 3:35 AM CDTSpecial Weather StatementMKX40 min
Sep 17, 1:49 PM CDTMesoscale DiscussionSPC116 min
Sep 17, 6:27 PM CDTSpecial Weather StatementMKX33 min
Sep 17, 7:51 PM CDTSevere Thunderstorm WarningMKX24 min
Sep 17, 8:49 PM CDTAreal Flood AdvisoryMKX3 hr
Sep 17, 9:11 PM CDTFlash Flood WarningMKX3 hr
Sep 17, 10:01 PM CDTFlash Flood WarningMKX3 hr
Sep 18, 3:51 AM CDTFlash Flood WatchMKX23 hr
Oct 15, 3:00 PM CDTFreeze WatchMKX12 hr
Oct 16, 3:04 AM CDTFreeze WarningMKX30 hr
Nov 10, 3:10 PM CSTWind AdvisoryMKX51 hr
Nov 11, 6:16 PM CSTSevere Thunderstorm WatchSPC4 hr
Nov 11, 6:59 PM CSTSpecial Weather StatementMKX61 min
Nov 11, 8:22 PM CSTMesoscale DiscussionSPC53 min
Nov 19, 3:29 AM CSTWinter Storm WatchMKX25 hr
Nov 19, 9:01 AM CSTWind AdvisoryMKX9 hr
Nov 20, 4:12 AM CSTWinter Storm WarningMKX35 hr
Dec 6, 9:14 PM CSTDense Fog AdvisoryMKX9 hr
Dec 10, 11:16 AM CSTSpecial Weather StatementMKX14 min
Dec 12, 12:11 PM CSTDense Fog AdvisoryMKX21 hr
Dec 13, 3:59 AM CSTFlood WatchMKX29 hr
Dec 14, 10:53 AM CSTRiver Flood WarningMKX34 hr
Dec 23, 3:49 AM CSTWind AdvisoryMKX26 hr
Dec 23, 7:10 PM CSTSpecial Weather StatementMKX35 min
Dec 26, 3:13 PM CSTWinter Storm WatchMKX25 hr
Dec 27, 3:51 PM CSTWinter Storm WarningMKX38 hr
Dec 28, 12:13 PM CSTMesoscale DiscussionSPC5 hr
Dec 28, 6:00 PM CSTMesoscale DiscussionSPC5 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 archive20142016

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.