Alert archive / Iowa / Washington County

Weather alerts in Washington County, Iowa, 2020

121 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
121
Warnings
26
Watches
22
Advisories
29
Busiest month
June21 alerts
Busiest day
March 28, 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.

Washington County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings141029%5100%30 min
Flash flood warnings10100%0

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Quad Cities, IA: tornado warnings351363%3959%13 min
NWS Quad Cities, IA: severe thunderstorm warnings19914527%56588%27 min
NWS Quad Cities, IA: flash flood warnings312132%4185%60 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, 3:33 AM CSTWind AdvisoryDVN11 hr
Jan 9, 11:21 AM CSTWinter Storm WatchDVN16 hr
Jan 10, 3:17 AM CSTWinter Storm WarningDVN43 hr
Jan 10, 5:50 PM CSTMesoscale DiscussionSPC6 hr
Jan 14, 2:11 PM CSTWinter Weather AdvisoryDVN24 hr
Jan 15, 3:43 PM CSTWinter Storm WatchDVN23 hr
Jan 16, 2:17 PM CSTWinter Storm WarningDVN52 hr
Jan 18, 3:13 PM CSTWind Chill AdvisoryDVN21 hr
Jan 23, 9:06 PM CSTWinter Weather AdvisoryDVN15 hr
Jan 26, 3:40 AM CSTDense Fog AdvisoryDVN6 hr
Jan 26, 3:00 PM CSTDense Fog AdvisoryDVN19 hr
Feb 1, 12:49 AM CSTDense Fog AdvisoryDVN6 hr
Feb 11, 3:00 PM CSTWinter Weather AdvisoryDVN45 hr
Feb 12, 3:28 AM CSTWind Chill AdvisoryDVN23 hr
Feb 13, 10:05 AM CSTWind Chill AdvisoryDVN24 hr
Feb 17, 5:27 PM CSTDense Fog AdvisoryDVN7 hr
Feb 23, 10:35 AM CSTWinter Storm WatchDVN28 hr
Mar 4, 2:55 PM CSTWind AdvisoryDVN36 hr
Mar 4, 2:56 PM CSTFire Weather WatchDVN12 hr
Mar 5, 2:56 AM CSTRed Flag WarningDVN15 hr
Mar 19, 8:40 PM CDTMesoscale DiscussionSPC95 min
Mar 20, 7:03 AM CDTRiver Flood WarningDVN24 hr
Mar 25, 4:41 AM CDTDense Fog AdvisoryDVN5 hr
Mar 28, 1:34 AM CDTMesoscale DiscussionSPC56 min
Mar 28, 1:53 AM CDTSevere Thunderstorm WarningDVN26 min
Mar 28, 11:21 AM CDTSpecial Weather StatementDVN24 min
Mar 28, 1:33 PM CDTMesoscale DiscussionSPC117 min
Mar 28, 2:45 PM CDTTornado Watch PDSSPC6 hr
Mar 28, 5:21 PM CDTMesoscale DiscussionSPC84 min
Mar 28, 9:26 PM CDTWind AdvisoryDVN22 hr
Apr 7, 5:26 PM CDTSevere Thunderstorm WatchSPC6 hr
Apr 7, 8:45 PM CDTSevere Thunderstorm WarningDVN30 min
Apr 7, 9:14 PM CDTSevere Thunderstorm WarningDVN31 min
Apr 9, 2:52 AM CDTWind AdvisoryDVN16 hr
Apr 12, 3:42 AM CDTWind AdvisoryDVN36 hr
Apr 12, 3:49 PM CDTSpecial Weather StatementDVN56 min
Apr 15, 3:13 PM CDTWinter Storm WatchDVN11 hr
Apr 16, 2:12 AM CDTWinter Storm WarningDVN29 hr
Apr 16, 5:43 PM CDTMesoscale DiscussionSPC4 hr
May 7, 4:00 AM CDTFreeze WatchDVN23 hr
May 8, 3:16 AM CDTFreeze WarningDVN29 hr
May 10, 2:36 PM CDTFrost AdvisoryDVN16 hr
May 14, 11:38 AM CDTFlash Flood WatchDVN19 hr
May 14, 5:19 PM CDTMesoscale DiscussionSPC116 min
May 14, 6:15 PM CDTSevere Thunderstorm WatchSPC8 hr
May 14, 7:24 PM CDTSevere Thunderstorm WarningDVN51 min
May 14, 7:39 PM CDTSevere Thunderstorm WarningDVN36 min
May 14, 8:11 PM CDTSevere Thunderstorm WarningDVN49 min
May 15, 3:00 AM CDTDense Fog AdvisoryDVN4 hr
May 16, 6:45 PM CDTMesoscale DiscussionSPC90 min
May 23, 6:22 AM CDTSpecial Weather StatementDVN23 min
May 23, 6:29 AM CDTSevere Thunderstorm WarningDVN31 min
May 23, 11:29 AM CDTMesoscale DiscussionSPC2 hr
May 26, 1:38 PM CDTSpecial Weather StatementDVN22 min
May 26, 1:44 PM CDTSevere Thunderstorm WarningDVN31 min
May 28, 3:32 AM CDTFlash Flood WatchDVN15 hr
Jun 3, 4:56 AM CDTMesoscale DiscussionSPC3 hr
Jun 3, 6:37 PM CDTMesoscale DiscussionSPC113 min
Jun 4, 5:14 PM CDTMesoscale DiscussionSPC91 min
Jun 5, 4:17 AM CDTMesoscale DiscussionSPC88 min
Jun 5, 7:06 AM CDTSpecial Weather StatementDVN114 min
Jun 5, 7:27 AM CDTSevere Thunderstorm WarningDVN34 min
Jun 8, 3:23 AM CDTFlash Flood WatchDVN40 hr
Jun 9, 3:04 PM CDTSpecial Weather StatementDVN56 min
Jun 9, 8:19 PM CDTRiver Flood WarningDVN62 hr
Jun 9, 8:47 PM CDTRiver Flood WarningDVN48 hr
Jun 10, 12:45 AM CDTSpecial Weather StatementDVN45 min
Jun 22, 3:44 AM CDTSpecial Weather StatementDVN46 min
Jun 22, 4:23 AM CDTSpecial Weather StatementDVN52 min
Jun 22, 9:19 AM CDTRiver Flood WarningDVN13 hr
Jun 26, 8:30 AM CDTSpecial Weather StatementDVN45 min
Jun 26, 1:38 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 26, 5:40 PM CDTMesoscale DiscussionSPC65 min
Jun 26, 8:44 PM CDTSpecial Weather StatementDVN61 min
Jun 26, 9:54 PM CDTFlash Flood WarningDVN8 hr
Jun 27, 7:48 AM CDTSpecial Weather StatementDVN57 min
Jun 27, 2:48 PM CDTSpecial Weather StatementDVN57 min
Jul 7, 2:38 PM CDTHeat AdvisoryDVN28 hr
Jul 9, 10:24 AM CDTMesoscale DiscussionSPC3 hr
Jul 9, 11:05 AM CDTSevere Thunderstorm WatchSPC8 hr
Jul 9, 2:51 PM CDTMesoscale DiscussionSPC114 min
Jul 9, 3:47 PM CDTSpecial Weather StatementDVN28 min
Jul 11, 10:04 AM CDTSevere Thunderstorm WatchSPC3 hr
Jul 11, 3:58 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 11, 6:46 PM CDTSevere Thunderstorm WarningDVN44 min
Jul 11, 6:52 PM CDTSevere Thunderstorm WarningDVN53 min
Jul 11, 7:17 PM CDTMesoscale DiscussionSPC58 min
Jul 17, 3:04 AM CDTHeat AdvisoryDVN41 hr
Jul 25, 2:30 AM CDTHeat AdvisoryDVN41 hr
Jul 27, 3:24 AM CDTSpecial Weather StatementDVN2 hr
Aug 10, 10:42 AM CDTMesoscale DiscussionSPC93 min
Aug 10, 11:26 AM CDTSevere Thunderstorm Watch PDSSPC7 hr
Aug 10, 11:48 AM CDTSevere Thunderstorm WarningDVN57 min
Aug 10, 12:05 PM CDTSevere Thunderstorm WarningDVN55 min
Aug 10, 12:14 PM CDTMesoscale DiscussionSPC91 min
Aug 10, 12:42 PM CDTSevere Thunderstorm WarningDVN48 min
Aug 24, 12:18 PM CDTHeat AdvisoryDVN7 hr
Aug 25, 3:07 AM CDTHeat AdvisoryDVN16 hr
Aug 28, 2:56 PM CDTMesoscale DiscussionSPC64 min
Aug 28, 3:16 PM CDTSevere Thunderstorm WatchSPC4 hr
Aug 28, 5:29 PM CDTMesoscale DiscussionSPC91 min
Sep 5, 9:34 PM CDTSevere Thunderstorm WatchSPC7 hr
Sep 5, 11:26 PM CDTMesoscale DiscussionSPC94 min
Sep 6, 2:32 AM CDTMesoscale DiscussionSPC88 min
Sep 6, 2:53 AM CDTSevere Thunderstorm WatchSPC6 hr
Sep 6, 5:30 AM CDTMesoscale DiscussionSPC90 min
Sep 7, 9:40 PM CDTSpecial Weather StatementDVN35 min
Sep 11, 2:28 PM CDTFlash Flood WatchDVN15 hr
Oct 4, 2:54 AM CDTFrost AdvisoryDVN29 hr
Oct 15, 3:15 AM CDTFreeze WarningDVN29 hr
Oct 16, 1:43 PM CDTWind AdvisoryDVN28 hr
Oct 22, 2:35 AM CDTDense Fog AdvisoryDVN9 hr
Oct 22, 4:53 PM CDTMesoscale DiscussionSPC2 hr
Nov 14, 3:35 AM CSTWind AdvisoryDVN38 hr
Dec 11, 2:08 AM CSTWinter Weather AdvisoryDVN36 hr
Dec 23, 3:43 AM CSTWind AdvisoryDVN23 hr
Dec 28, 3:19 AM CSTWinter Storm WatchDVN17 hr
Dec 28, 3:15 PM CSTWinter Storm WarningDVN38 hr
Dec 29, 10:02 AM CSTMesoscale DiscussionSPC5 hr
Dec 29, 2:17 PM CSTMesoscale DiscussionSPC4 hr
Dec 29, 6:05 PM CSTSpecial Weather StatementDVN85 min

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.