Alert archive / Iowa / Crawford County

Weather alerts in Crawford County, Iowa, 2017

93 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Crawford County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
93
Warnings
18
Watches
13
Advisories
30
Busiest month
January12 alerts
Busiest day
March 6, 20178 alerts

Over time

By month

Warning verification

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

Crawford County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings10550%667%27 min
Flash flood warnings2150%0

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Des Moines, IA: tornado warnings251060%1889%9 min
NWS Des Moines, IA: severe thunderstorm warnings27515444%52283%21 min
NWS Des Moines, IA: flash flood warnings9633%1486%248 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 1, 3:29 AM CSTFreezing Rain AdvisoryDMX36 hr
Jan 10, 4:16 AM CSTWinter Weather AdvisoryDMX14 hr
Jan 10, 9:48 AM CSTWind AdvisoryDMX8 hr
Jan 12, 3:11 PM CSTWinter Storm WatchDMX49 hr
Jan 14, 4:13 PM CSTIce Storm WarningDMX48 hr
Jan 14, 4:13 PM CSTWinter Weather AdvisoryDMX59 hr
Jan 19, 3:28 PM CSTDense Fog AdvisoryDMX21 hr
Jan 20, 3:31 PM CSTDense Fog AdvisoryDMX20 hr
Jan 21, 3:53 PM CSTDense Fog AdvisoryDMX20 hr
Jan 23, 3:12 PM CSTWinter Storm WarningDMX51 hr
Jan 23, 3:12 PM CSTWinter Weather AdvisoryDMX57 hr
Jan 30, 3:52 AM CSTWind AdvisoryDMX17 hr
Feb 7, 3:48 PM CSTWinter Weather AdvisoryDMX20 hr
Feb 21, 3:42 PM CSTWinter Storm WatchDMX37 hr
Feb 23, 4:31 AM CSTBlizzard WarningDMX41 hr
Feb 23, 4:31 AM CSTWinter Weather AdvisoryDMX43 hr
Feb 23, 6:05 PM CSTMesoscale DiscussionSPC6 hr
Feb 23, 11:54 PM CSTMesoscale DiscussionSPC6 hr
Mar 6, 4:25 AM CSTWind AdvisoryDMX24 hr
Mar 6, 1:08 PM CSTMesoscale DiscussionSPC3 hr
Mar 6, 1:54 PM CSTTornado WatchSPC8 hr
Mar 6, 3:28 PM CSTFire Weather WatchDMX13 hr
Mar 6, 3:29 PM CSTWind AdvisoryDMX27 hr
Mar 6, 3:35 PM CSTMesoscale DiscussionSPC115 min
Mar 6, 3:50 PM CSTSevere Thunderstorm WarningDMX55 min
Mar 6, 4:19 PM CSTSevere Thunderstorm WarningDMX41 min
Mar 7, 4:00 AM CSTRed Flag WarningDMX14 hr
Apr 3, 1:53 AM CDTDense Fog AdvisoryDMX8 hr
Apr 15, 12:03 PM CDTSpecial Weather StatementDMX42 min
Apr 15, 4:01 PM CDTMesoscale DiscussionSPC119 min
Apr 15, 5:05 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 19, 2:29 PM CDTMesoscale DiscussionSPC3 hr
Apr 19, 3:23 PM CDTTornado WatchSPC7 hr
Apr 19, 6:55 PM CDTMesoscale DiscussionSPC95 min
Apr 19, 7:02 PM CDTSpecial Weather StatementDMX43 min
Apr 19, 7:18 PM CDTSevere Thunderstorm WarningDMX31 min
May 8, 2:58 AM CDTSevere Thunderstorm WarningDMX32 min
May 15, 3:48 PM CDTMesoscale DiscussionSPC87 min
May 16, 3:58 PM CDTMesoscale DiscussionSPC2 hr
May 16, 4:57 PM CDTSevere Thunderstorm WatchSPC7 hr
May 16, 7:02 PM CDTSevere Thunderstorm WarningDMX43 min
May 16, 7:31 PM CDTMesoscale DiscussionSPC59 min
May 16, 7:41 PM CDTSevere Thunderstorm WarningDMX49 min
May 16, 9:43 PM CDTMesoscale DiscussionSPC62 min
May 17, 12:08 PM CDTTornado WatchSPC7 hr
May 17, 2:25 PM CDTMesoscale DiscussionSPC65 min
Jun 13, 9:36 PM CDTMesoscale DiscussionSPC54 min
Jun 15, 5:11 PM CDTMesoscale DiscussionSPC64 min
Jun 16, 3:53 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 27, 11:33 PM CDTMesoscale DiscussionSPC57 min
Jun 29, 3:42 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 29, 6:08 PM CDTMesoscale DiscussionSPC67 min
Jun 29, 6:15 PM CDTSevere Thunderstorm WarningDMX45 min
Jun 29, 7:05 PM CDTSevere Thunderstorm WarningDMX40 min
Jul 4, 5:10 PM CDTSpecial Weather StatementDMX35 min
Jul 11, 1:20 AM CDTSpecial Weather StatementDMX40 min
Jul 11, 1:54 AM CDTMesoscale DiscussionSPC3 hr
Jul 17, 2:58 PM CDTExcessive Heat WatchDMX24 hr
Jul 18, 2:58 PM CDTHeat AdvisoryDMX4 days
Jul 20, 3:57 PM CDTMesoscale DiscussionSPC2 hr
Jul 20, 7:12 PM CDTSevere Thunderstorm WarningDMX26 min
Jul 21, 1:32 PM CDTMesoscale DiscussionSPC2 hr
Aug 15, 6:35 PM CDTSpecial Weather StatementDMX55 min
Aug 18, 2:54 PM CDTMesoscale DiscussionSPC3 hr
Aug 18, 4:51 PM CDTSevere Thunderstorm WatchSPC8 hr
Aug 20, 11:03 PM CDTSpecial Weather StatementDMX27 min
Aug 20, 11:05 PM CDTSevere Thunderstorm WarningDMX40 min
Aug 20, 11:14 PM CDTMesoscale DiscussionSPC91 min
Aug 21, 12:32 AM CDTFlash Flood WarningDMX6 hr
Aug 21, 1:31 AM CDTFlash Flood WarningDMX6 hr
Aug 21, 2:35 PM CDTMesoscale DiscussionSPC85 min
Aug 21, 3:43 PM CDTSpecial Weather StatementDMX77 min
Aug 27, 2:37 AM CDTDense Fog AdvisoryDMX5 hr
Sep 15, 6:16 AM CDTSpecial Weather StatementDMX59 min
Sep 22, 10:20 AM CDTHeat AdvisoryDMX9 hr
Oct 2, 6:40 PM CDTMesoscale DiscussionSPC3 hr
Oct 6, 4:07 AM CDTFlash Flood WatchDMX23 hr
Oct 6, 3:14 PM CDTMesoscale DiscussionSPC91 min
Oct 10, 11:58 PM CDTFrost AdvisoryDMX8 hr
Oct 15, 3:27 PM CDTFrost AdvisoryDMX17 hr
Oct 22, 3:10 PM CDTWind AdvisoryDMX51 hr
Oct 26, 3:38 PM CDTFreeze WarningDMX17 hr
Oct 26, 3:38 PM CDTWind AdvisoryDMX26 hr
Nov 12, 9:36 PM CSTDense Fog AdvisoryDMX14 hr
Nov 17, 7:39 PM CSTDense Fog AdvisoryDMX4 hr
Dec 3, 3:41 PM CSTWind AdvisoryDMX39 hr
Dec 11, 3:24 AM CSTWind AdvisoryDMX15 hr
Dec 12, 3:57 PM CSTWind AdvisoryDMX26 hr
Dec 21, 3:54 AM CSTWinter Weather AdvisoryDMX19 hr
Dec 25, 4:18 AM CSTWind Chill AdvisoryDMX32 hr
Dec 26, 1:53 PM CSTWind Chill AdvisoryDMX20 hr
Dec 29, 3:50 PM CSTWind Chill WarningDMX4 days
Dec 29, 3:50 PM CSTWind Chill AdvisoryDMX38 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 archive20162018

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.