Alert archive / Minnesota / Washington County

Weather alerts in Washington County, Minnesota, 2020

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

Washington County and its neighbors

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

Alerts
124
Warnings
28
Watches
17
Advisories
32
Busiest month
July34 alerts
Busiest day
July 18, 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 3 tornado warnings covering Washington County in 2020 had a tornado report inside them; 2 of 3 tornado reports fell inside a warning, on average 1 minutes after it went out.

Washington County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings3233%367%1 min
Severe thunderstorm warnings7529%70%
Flash flood warnings110%0

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Twin Cities, MN: tornado warnings471568%4159%12 min
NWS Twin Cities, MN: severe thunderstorm warnings1949849%32870%20 min
NWS Twin Cities, MN: flash flood warnings181044%2685%126 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 4, 2:42 PM CSTWind AdvisoryMPX25 hr
Jan 13, 2:41 PM CSTWinter Weather AdvisoryMPX15 hr
Jan 15, 2:53 PM CSTWind Chill AdvisoryMPX18 hr
Jan 15, 2:53 PM CSTWinter Storm WatchMPX21 hr
Jan 16, 11:31 AM CSTWinter Storm WarningMPX54 hr
Jan 21, 7:48 PM CSTWinter Weather AdvisoryMPX21 hr
Feb 8, 4:30 AM CSTWinter Storm WatchMPX11 hr
Feb 8, 4:30 AM CSTWinter Storm WarningMPX34 hr
Feb 8, 4:30 AM CSTWinter Weather AdvisoryMPX34 hr
Feb 9, 6:39 AM CSTMesoscale DiscussionSPC4 hr
Feb 11, 8:13 PM CSTWind Chill AdvisoryMPX40 hr
Feb 12, 4:30 AM CSTWinter Weather AdvisoryMPX18 hr
Feb 13, 2:55 PM CSTWind Chill AdvisoryMPX18 hr
Feb 16, 2:54 PM CSTWinter Weather AdvisoryMPX33 hr
Mar 30, 11:12 AM CDTRiver Flood WarningMPX21 days
Mar 30, 11:12 AM CDTRiver Flood WarningMPX21 days
Apr 2, 3:35 AM CDTWinter Weather AdvisoryMPX42 hr
Apr 10, 3:30 PM CDTWinter Storm WatchMPX23 hr
Apr 11, 2:42 PM CDTWinter Storm WarningMPX37 hr
Apr 12, 12:38 PM CDTMesoscale DiscussionSPC3 hr
Apr 19, 2:39 PM CDTFire Weather WatchMPX13 hr
Apr 20, 3:49 AM CDTRed Flag WarningMPX14 hr
Apr 20, 4:16 PM CDTSpecial Weather StatementMPX44 min
May 7, 3:46 AM CDTFreeze WatchMPX23 hr
May 7, 3:46 AM CDTFreeze WarningMPX29 hr
May 8, 3:11 AM CDTFreeze WarningMPX29 hr
May 10, 2:41 AM CDTFreeze WarningMPX29 hr
May 11, 2:01 PM CDTFreeze WarningMPX19 hr
May 24, 1:54 AM CDTDense Fog AdvisoryMPX7 hr
May 26, 4:56 PM CDTFlash Flood WatchMPX11 hr
May 26, 5:37 PM CDTSpecial Weather StatementMPX53 min
May 26, 7:13 PM CDTTornado WarningMPX14 min
May 26, 8:03 PM CDTSpecial Weather StatementMPX87 min
May 26, 9:28 PM CDTSpecial Weather StatementMPX92 min
Jun 2, 3:41 PM CDTSpecial Weather StatementMPX64 min
Jun 2, 3:52 PM CDTMesoscale DiscussionSPC113 min
Jun 8, 1:45 PM CDTFlash Flood WatchMPX35 hr
Jun 18, 6:28 PM CDTSpecial Weather StatementMPX47 min
Jun 21, 2:44 PM CDTMesoscale DiscussionSPC2 hr
Jun 23, 6:42 PM CDTSpecial Weather StatementMPX63 min
Jun 28, 7:25 PM CDTSpecial Weather StatementMPX35 min
Jun 28, 10:27 PM CDTSpecial Weather StatementMPX2 hr
Jun 29, 1:22 AM CDTMesoscale DiscussionSPC2 hr
Jun 29, 1:31 AM CDTFlash Flood WatchMPX10 hr
Jun 29, 4:27 AM CDTHeat AdvisoryMPX8 hr
Jun 29, 4:33 AM CDTSpecial Weather StatementMPX57 min
Jun 29, 11:58 PM CDTSpecial Weather StatementMPX2 hr
Jul 2, 3:09 AM CDTHeat AdvisoryMPX16 hr
Jul 3, 3:00 AM CDTHeat AdvisoryMPX16 hr
Jul 5, 2:59 AM CDTHeat AdvisoryMPX16 hr
Jul 5, 1:47 PM CDTSpecial Weather StatementMPX28 min
Jul 5, 1:52 PM CDTSpecial Weather StatementMPX23 min
Jul 5, 2:19 PM CDTSpecial Weather StatementMPX26 min
Jul 5, 2:48 PM CDTSpecial Weather StatementMPX27 min
Jul 5, 3:00 PM CDTSpecial Weather StatementMPX30 min
Jul 5, 3:03 PM CDTFlash Flood WarningMPX3 hr
Jul 7, 3:05 PM CDTHeat AdvisoryMPX29 hr
Jul 8, 2:39 AM CDTExcessive Heat WarningMPX17 hr
Jul 8, 8:18 AM CDTSpecial Weather StatementMPX57 min
Jul 9, 4:49 AM CDTSevere Thunderstorm WarningMPX26 min
Jul 9, 5:20 AM CDTSpecial Weather StatementMPX25 min
Jul 9, 5:38 AM CDTSevere Thunderstorm WarningMPX24 min
Jul 14, 7:22 AM CDTSevere Thunderstorm WarningMPX38 min
Jul 16, 3:36 PM CDTExcessive Heat WatchMPX23 hr
Jul 17, 2:24 PM CDTExcessive Heat WarningMPX31 hr
Jul 17, 2:24 PM CDTHeat AdvisoryMPX31 hr
Jul 17, 9:03 PM CDTMesoscale DiscussionSPC117 min
Jul 17, 10:25 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 17, 11:36 PM CDTMesoscale DiscussionSPC114 min
Jul 18, 1:31 AM CDTMesoscale DiscussionSPC89 min
Jul 18, 3:03 AM CDTSevere Thunderstorm WarningMPX42 min
Jul 18, 3:12 PM CDTMesoscale DiscussionSPC93 min
Jul 18, 3:53 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 18, 6:07 PM CDTTornado WarningMPX38 min
Jul 18, 6:15 PM CDTMesoscale DiscussionSPC60 min
Jul 18, 8:36 PM CDTMesoscale DiscussionSPC114 min
Jul 18, 9:53 PM CDTTornado WarningMPX37 min
Jul 21, 1:43 PM CDTMesoscale DiscussionSPC2 hr
Jul 23, 3:06 AM CDTExcessive Heat WatchMPX12 hr
Jul 23, 2:37 PM CDTExcessive Heat WarningMPX53 hr
Jul 23, 2:37 PM CDTHeat AdvisoryMPX66 hr
Aug 7, 3:52 PM CDTSevere Thunderstorm WatchSPC9 hr
Aug 9, 12:30 PM CDTMesoscale DiscussionSPC3 hr
Aug 9, 12:49 PM CDTSpecial Weather StatementMPX41 min
Aug 9, 8:11 PM CDTMesoscale DiscussionSPC94 min
Aug 9, 10:59 PM CDTMesoscale DiscussionSPC3 hr
Aug 10, 1:57 AM CDTSevere Thunderstorm WarningMPX48 min
Aug 10, 2:30 AM CDTMesoscale DiscussionSPC90 min
Aug 14, 5:38 PM CDTSevere Thunderstorm WatchSPC5 hr
Aug 14, 7:28 PM CDTMesoscale DiscussionSPC92 min
Aug 14, 8:13 PM CDTSevere Thunderstorm WarningMPX47 min
Aug 14, 8:16 PM CDTSevere Thunderstorm WarningMPX44 min
Aug 21, 9:54 PM CDTMesoscale DiscussionSPC2 hr
Aug 24, 3:40 AM CDTHeat AdvisoryMPX16 hr
Aug 25, 3:07 AM CDTHeat AdvisoryMPX16 hr
Aug 28, 1:54 AM CDTSevere Thunderstorm WatchSPC7 hr
Aug 28, 4:04 AM CDTMesoscale DiscussionSPC86 min
Aug 28, 4:48 AM CDTSpecial Weather StatementMPX42 min
Aug 28, 5:32 AM CDTSpecial Weather StatementMPX28 min
Sep 9, 2:45 AM CDTFrost AdvisoryMPX28 hr
Sep 10, 2:44 PM CDTFrost AdvisoryMPX18 hr
Sep 17, 11:03 AM CDTFrost AdvisoryMPX21 hr
Sep 26, 5:17 PM CDTMesoscale DiscussionSPC118 min
Sep 30, 5:15 PM CDTSpecial Weather StatementMPX45 min
Oct 1, 3:42 AM CDTFrost AdvisoryMPX28 hr
Oct 3, 2:59 PM CDTFrost AdvisoryMPX18 hr
Oct 11, 11:11 PM CDTSpecial Weather StatementMPX34 min
Oct 19, 2:46 PM CDTWinter Weather AdvisoryMPX34 hr
Oct 20, 11:53 AM CDTWinter Storm WarningMPX13 hr
Oct 20, 12:23 PM CDTMesoscale DiscussionSPC3 hr
Oct 31, 1:55 PM CDTWind AdvisoryMPX20 hr
Nov 7, 1:06 PM CSTWind AdvisoryMPX29 hr
Nov 9, 2:46 PM CSTWinter Storm WatchMPX14 hr
Nov 10, 4:52 AM CSTWinter Storm WarningMPX21 hr
Nov 10, 3:51 PM CSTMesoscale DiscussionSPC6 hr
Nov 14, 2:18 PM CSTWind AdvisoryMPX25 hr
Nov 24, 8:40 PM CSTDense Fog AdvisoryMPX8 hr
Dec 22, 3:49 AM CSTWinter Storm WatchMPX23 hr
Dec 22, 2:50 PM CSTWinter Storm WarningMPX36 hr
Dec 22, 9:08 PM CSTBlizzard WarningMPX30 hr
Dec 23, 12:33 PM CSTMesoscale DiscussionSPC4 hr
Dec 23, 5:15 PM CSTMesoscale DiscussionSPC6 hr
Dec 24, 2:43 AM CSTWind Chill AdvisoryMPX9 hr
Dec 28, 3:18 AM CSTWinter Weather AdvisoryMPX47 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.