Alert archive / Iowa / Montgomery County

Weather alerts in Montgomery County, Iowa, 2017

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

Montgomery County and its neighbors

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

Alerts
106
Warnings
27
Watches
16
Advisories
22
Busiest month
June28 alerts
Busiest day
March 6, 201710 alerts

Over time

By month

Warning verification

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

1 of 2 tornado warnings covering Montgomery County in 2017 had a tornado report inside them.

Montgomery County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%0
Severe thunderstorm warnings191047%367%11 min
Flash flood warnings00

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Omaha, NE: tornado warnings251060%2763%14 min
NWS Omaha, NE: severe thunderstorm warnings25814046%41287%17 min
NWS Omaha, NE: flash flood warnings8538%1392%69 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, 1:41 PM CSTDense Fog AdvisoryOAX8 hr
Jan 12, 4:00 PM CSTWinter Storm WatchOAX47 hr
Jan 14, 2:37 PM CSTIce Storm WarningOAX52 hr
Jan 19, 3:39 PM CSTDense Fog AdvisoryOAX17 hr
Jan 20, 6:27 PM CSTDense Fog AdvisoryOAX17 hr
Jan 21, 9:34 PM CSTDense Fog AdvisoryOAX7 hr
Feb 23, 9:48 PM CSTMesoscale DiscussionSPC2 hr
Mar 5, 3:40 PM CSTRed Flag WarningOAX28 hr
Mar 5, 3:44 PM CSTWind AdvisoryOAX28 hr
Mar 6, 1:08 PM CSTMesoscale DiscussionSPC3 hr
Mar 6, 1:54 PM CSTTornado WatchSPC8 hr
Mar 6, 3:35 PM CSTMesoscale DiscussionSPC115 min
Mar 6, 4:09 PM CSTSevere Thunderstorm WarningOAX36 min
Mar 6, 4:32 PM CSTFire Weather WatchOAX11 hr
Mar 6, 4:32 PM CSTRed Flag WarningOAX25 hr
Mar 6, 4:56 PM CSTSevere Thunderstorm WarningOAX34 min
Mar 6, 5:19 PM CSTSevere Thunderstorm WarningOAX26 min
Mar 6, 5:29 PM CSTSevere Thunderstorm WarningOAX31 min
Mar 6, 5:39 PM CSTSevere Thunderstorm WarningOAX21 min
Mar 6, 6:11 PM CSTMesoscale DiscussionSPC2 hr
Mar 7, 3:17 AM CSTWind AdvisoryOAX12 hr
Apr 3, 1:32 AM CDTDense Fog AdvisoryOAX9 hr
Apr 15, 4:01 PM CDTMesoscale DiscussionSPC119 min
Apr 15, 5:05 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 15, 7:22 PM CDTMesoscale DiscussionSPC53 min
Apr 19, 2:29 PM CDTMesoscale DiscussionSPC3 hr
Apr 19, 3:23 PM CDTTornado WatchSPC7 hr
Apr 19, 5:30 PM CDTMesoscale DiscussionSPC60 min
Apr 26, 3:54 AM CDTFrost AdvisoryOAX29 hr
May 16, 3:58 PM CDTMesoscale DiscussionSPC2 hr
May 16, 4:57 PM CDTSevere Thunderstorm WatchSPC7 hr
May 16, 6:43 PM CDTSevere Thunderstorm WarningOAX47 min
May 16, 7:18 PM CDTSevere Thunderstorm WarningOAX57 min
May 16, 7:31 PM CDTMesoscale DiscussionSPC59 min
May 16, 8:58 PM CDTSpecial Weather StatementOAX47 min
May 16, 9:43 PM CDTMesoscale DiscussionSPC62 min
May 16, 9:53 PM CDTSevere Thunderstorm WarningOAX37 min
May 16, 10:12 PM CDTSpecial Weather StatementOAX48 min
May 17, 11:39 AM CDTMesoscale DiscussionSPC66 min
May 17, 12:08 PM CDTTornado WatchSPC7 hr
May 17, 2:25 PM CDTMesoscale DiscussionSPC65 min
May 17, 3:03 PM CDTSpecial Weather StatementOAX42 min
Jun 12, 2:33 PM CDTSpecial Weather StatementOAX27 min
Jun 12, 5:41 PM CDTSpecial Weather StatementOAX49 min
Jun 13, 9:36 PM CDTMesoscale DiscussionSPC54 min
Jun 14, 8:15 AM CDTSevere Thunderstorm WarningOAX30 min
Jun 15, 5:11 PM CDTMesoscale DiscussionSPC64 min
Jun 15, 6:32 PM CDTSevere Thunderstorm WarningOAX28 min
Jun 15, 6:39 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 15, 6:54 PM CDTSevere Thunderstorm WarningOAX21 min
Jun 15, 7:16 PM CDTSevere Thunderstorm WarningOAX29 min
Jun 15, 9:33 PM CDTMesoscale DiscussionSPC57 min
Jun 15, 10:26 PM CDTSpecial Weather StatementOAX34 min
Jun 16, 3:30 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 16, 6:16 PM CDTMesoscale DiscussionSPC119 min
Jun 16, 8:07 PM CDTTornado WarningOAX23 min
Jun 16, 8:14 PM CDTSevere Thunderstorm WarningOAX31 min
Jun 16, 8:29 PM CDTTornado WarningOAX31 min
Jun 16, 8:43 PM CDTSevere Thunderstorm WarningOAX32 min
Jun 16, 9:13 PM CDTSevere Thunderstorm WarningOAX32 min
Jun 16, 9:27 PM CDTMesoscale DiscussionSPC2 hr
Jun 28, 2:14 PM CDTMesoscale DiscussionSPC2 hr
Jun 28, 2:53 PM CDTTornado WatchSPC9 hr
Jun 28, 3:17 PM CDTSevere Thunderstorm WarningOAX43 min
Jun 28, 5:14 PM CDTSevere Thunderstorm WarningOAX20 min
Jun 28, 5:29 PM CDTMesoscale DiscussionSPC91 min
Jun 29, 3:42 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 29, 6:08 PM CDTMesoscale DiscussionSPC67 min
Jun 29, 10:39 PM CDTSevere Thunderstorm WarningOAX36 min
Jun 29, 11:26 PM CDTSevere Thunderstorm WarningOAX34 min
Jul 10, 2:51 PM CDTHeat AdvisoryOAX29 hr
Jul 11, 1:54 AM CDTMesoscale DiscussionSPC3 hr
Jul 17, 3:41 PM CDTExcessive Heat WatchOAX24 hr
Jul 18, 3:57 PM CDTExcessive Heat WarningOAX4 days
Jul 26, 4:36 AM CDTFlash Flood WatchOAX17 hr
Aug 20, 11:37 AM CDTSpecial Weather StatementOAX53 min
Aug 21, 2:11 AM CDTSpecial Weather StatementOAX49 min
Aug 21, 9:31 PM CDTSpecial Weather StatementOAX59 min
Aug 26, 1:35 PM CDTMesoscale DiscussionSPC2 hr
Sep 3, 5:44 AM CDTDense Fog AdvisoryOAX4 hr
Sep 25, 3:06 PM CDTSpecial Weather StatementOAX39 min
Oct 4, 3:22 PM CDTFlood WatchOAX60 hr
Oct 6, 3:14 PM CDTMesoscale DiscussionSPC91 min
Oct 6, 8:23 PM CDTMesoscale DiscussionSPC97 min
Oct 6, 9:54 PM CDTMesoscale DiscussionSPC96 min
Oct 6, 10:15 PM CDTSpecial Weather StatementOAX45 min
Oct 14, 4:21 AM CDTMesoscale DiscussionSPC84 min
Oct 15, 11:11 AM CDTFrost AdvisoryOAX23 hr
Oct 21, 1:23 PM CDTMesoscale DiscussionSPC3 hr
Oct 21, 2:57 PM CDTMesoscale DiscussionSPC2 hr
Oct 21, 6:08 PM CDTSpecial Weather StatementOAX37 min
Oct 22, 3:08 PM CDTWind AdvisoryOAX28 hr
Oct 24, 3:17 AM CDTWind AdvisoryOAX13 hr
Oct 25, 3:22 PM CDTFreeze WatchOAX12 hr
Oct 26, 3:29 AM CDTFreeze WarningOAX30 hr
Oct 27, 4:03 AM CDTFreeze WarningOAX30 hr
Nov 13, 2:39 AM CSTDense Fog AdvisoryOAX7 hr
Dec 3, 3:16 PM CSTWind AdvisoryOAX33 hr
Dec 11, 2:45 AM CSTWind AdvisoryOAX15 hr
Dec 12, 3:05 PM CSTWind AdvisoryOAX25 hr
Dec 18, 5:04 AM CSTDense Fog AdvisoryOAX4 hr
Dec 23, 3:40 AM CSTWinter Weather AdvisoryOAX26 hr
Dec 26, 2:05 PM CSTWind Chill AdvisoryOAX20 hr
Dec 29, 2:50 PM CSTWind Chill WatchOAX13 hr
Dec 29, 2:50 PM CSTWind Chill AdvisoryOAX21 hr
Dec 30, 3:55 AM CSTWind Chill AdvisoryOAX42 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.