Alert archive / Montana / Sanders County

Weather alerts in Sanders County, Montana, 2012

119 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Sanders County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts
119
Warnings
28
Watches
13
Advisories
65
Busiest month
January16 alerts
Busiest day
July 20, 20126 alerts

Over time

By month

Warning verification

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

Sanders County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings8625%580%26 min
Flash flood warnings00

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: severe thunderstorm warnings572556%7149%20 min
NWS Missoula, MT: flash flood warnings60100%60%

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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 3, 1:08 AM MSTFreezing Rain AdvisoryMSO9 hr
Jan 5, 8:18 AM MSTWind AdvisoryMSO8 hr
Jan 8, 2:39 AM MSTWinter Weather AdvisoryMSO9 hr
Jan 9, 6:14 AM MSTFreezing Fog AdvisoryMSO7 hr
Jan 9, 10:34 AM MSTWinter Weather AdvisoryMSO25 hr
Jan 10, 12:54 PM MSTWinter Weather AdvisoryMSO20 hr
Jan 13, 2:56 PM MSTWinter Weather AdvisoryMSO62 hr
Jan 15, 2:46 PM MSTWinter Storm WatchMSO48 hr
Jan 16, 3:30 PM MSTWinter Storm WarningMSO4 days
Jan 17, 2:53 PM MSTWinter Weather AdvisoryMSO66 hr
Jan 20, 2:23 PM MSTWinter Weather AdvisoryMSO39 hr
Jan 22, 2:19 PM MSTWinter Weather AdvisoryMSO21 hr
Jan 24, 4:15 AM MSTWinter Weather AdvisoryMSO66 hr
Jan 28, 2:18 PM MSTWinter Weather AdvisoryMSO51 hr
Jan 29, 3:37 AM MSTFreezing Rain AdvisoryMSO5 hr
Jan 29, 10:27 AM MSTWind AdvisoryMSO10 hr
Feb 8, 11:53 PM MSTWinter Weather AdvisoryMSO11 hr
Feb 10, 4:39 AM MSTWinter Weather AdvisoryMSO30 hr
Feb 12, 4:39 AM MSTWinter Weather AdvisoryMSO6 hr
Feb 13, 3:51 AM MSTDense Fog AdvisoryMSO7 hr
Feb 17, 3:36 AM MSTWinter Weather AdvisoryMSO55 hr
Feb 19, 3:03 PM MSTHigh Wind WatchMSO54 hr
Feb 19, 3:06 PM MSTWinter Storm WatchMSO47 hr
Feb 21, 3:46 AM MSTWinter Storm WarningMSO48 hr
Feb 21, 3:47 AM MSTWind AdvisoryMSO43 hr
Feb 21, 10:28 AM MSTHigh Wind WarningMSO31 hr
Feb 22, 4:53 PM MSTWinter Weather AdvisoryMSO16 hr
Feb 23, 2:11 PM MSTWinter Storm WatchMSO24 hr
Feb 24, 2:18 PM MSTWinter Storm WarningMSO37 hr
Feb 24, 2:18 PM MSTWinter Weather AdvisoryMSO44 hr
Feb 28, 11:44 AM MSTWinter Weather AdvisoryMSO59 hr
Mar 2, 11:20 AM MSTWinter Weather AdvisoryMSO26 hr
Mar 5, 1:30 PM MSTWinter Weather AdvisoryMSO23 hr
Mar 10, 3:30 AM MSTWinter Weather AdvisoryMSO38 hr
Mar 12, 12:04 PM MDTWinter Weather AdvisoryMSO45 hr
Mar 12, 12:22 PM MDTWind AdvisoryMSO30 hr
Mar 14, 2:29 PM MDTWinter Weather AdvisoryMSO49 hr
Mar 19, 2:54 PM MDTWinter Weather AdvisoryMSO66 hr
Mar 20, 2:25 PM MDTWinter Storm WarningMSO43 hr
Mar 29, 9:07 AM MDTAreal Flood AdvisoryMSO48 hr
Mar 30, 8:29 AM MDTLake Wind AdvisoryMSO9 hr
Mar 31, 2:45 PM MDTWinter Weather AdvisoryMSO23 hr
Apr 3, 4:25 AM MDTWinter Weather AdvisoryMSO39 hr
Apr 4, 4:43 AM MDTLake Wind AdvisoryMSO15 hr
Apr 20, 8:59 AM MDTLake Wind AdvisoryMSO9 hr
Apr 23, 2:41 PM MDTFlood WatchMSO5 days
Apr 24, 1:58 PM MDTAreal Flood WarningMSO23 hr
Apr 25, 1:03 PM MDTAreal Flood WarningMSO45 hr
Apr 25, 1:21 PM MDTAreal Flood WarningMSO39 min
Apr 26, 8:12 AM MDTWind AdvisoryMSO10 hr
May 10, 11:03 AM MDTFreeze WarningMSO22 hr
May 24, 10:48 AM MDTWind AdvisoryMSO30 hr
Jun 4, 12:49 PM MDTMesoscale DiscussionSPC86 min
Jun 4, 1:46 PM MDTSevere Thunderstorm WatchSPC10 hr
Jun 4, 4:45 PM MDTMesoscale DiscussionSPC90 min
Jun 4, 7:42 PM MDTMesoscale DiscussionSPC93 min
Jun 4, 10:08 PM MDTMesoscale DiscussionSPC67 min
Jun 4, 11:11 PM MDTSevere Thunderstorm WarningMSO35 min
Jun 6, 9:30 AM MDTLake Wind AdvisoryMSO5 hr
Jun 16, 12:42 PM MDTWind AdvisoryMSO32 hr
Jun 17, 7:34 AM MDTLake Wind AdvisoryMSO13 hr
Jun 23, 2:49 PM MDTMesoscale DiscussionSPC116 min
Jun 23, 7:14 PM MDTSevere Thunderstorm WarningMSO31 min
Jun 26, 5:02 AM MDTSpecial Weather StatementMSO28 min
Jun 26, 6:38 AM MDTSevere Thunderstorm WarningMSO52 min
Jun 26, 8:50 AM MDTLake Wind AdvisoryMSO9 hr
Jun 30, 8:33 PM MDTMesoscale DiscussionSPC2 hr
Jun 30, 11:26 PM MDTSpecial Weather StatementMSO64 min
Jul 1, 2:15 AM MDTSevere Thunderstorm WarningMSO45 min
Jul 3, 3:53 AM MDTWind AdvisoryMSO17 hr
Jul 12, 11:50 PM MDTMesoscale DiscussionSPC115 min
Jul 15, 1:49 PM MDTAreal Flood WarningMSO4 hr
Jul 16, 3:04 PM MDTFlash Flood WatchMSO5 hr
Jul 19, 1:06 PM MDTFlash Flood WatchMSO31 hr
Jul 20, 12:38 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 20, 3:09 PM MDTSevere Thunderstorm WarningMSO51 min
Jul 20, 3:52 PM MDTSpecial Weather StatementMSO53 min
Jul 20, 4:21 PM MDTSevere Thunderstorm WarningMSO39 min
Jul 20, 4:31 PM MDTSevere Thunderstorm WarningMSO59 min
Jul 20, 4:53 PM MDTSevere Thunderstorm WarningMSO67 min
Jul 20, 6:21 PM MDTMesoscale DiscussionSPC84 min
Jul 22, 5:06 PM MDTMesoscale DiscussionSPC54 min
Aug 5, 2:44 PM MDTFire Weather WatchMSO14 hr
Aug 5, 2:44 PM MDTRed Flag WarningMSO29 hr
Aug 21, 2:45 PM MDTMesoscale DiscussionSPC2 hr
Aug 22, 2:32 PM MDTLake Wind AdvisoryMSO50 hr
Sep 5, 11:32 AM MDTWind AdvisoryMSO24 hr
Sep 8, 8:34 AM MDTRed Flag WarningMSO63 hr
Sep 10, 9:48 AM MDTFreeze WarningMSO47 hr
Sep 10, 9:48 AM MDTLake Wind AdvisoryMSO10 hr
Sep 11, 11:57 AM MDTFreeze WarningMSO46 hr
Oct 1, 4:50 AM MDTLake Wind AdvisoryMSO56 hr
Oct 14, 7:28 PM MDTWind AdvisoryMSO46 hr
Oct 15, 4:39 AM MDTHigh Wind WarningMSO40 hr
Oct 19, 10:55 AM MDTWind AdvisoryMSO29 hr
Oct 19, 11:20 AM MDTWinter Weather AdvisoryMSO32 hr
Oct 21, 2:36 PM MDTWinter Storm WatchMSO12 hr
Oct 22, 2:34 AM MDTWinter Storm WarningMSO25 hr
Oct 22, 2:34 AM MDTWinter Weather AdvisoryMSO48 hr
Oct 24, 1:53 PM MDTWinter Weather AdvisoryMSO22 hr
Oct 26, 2:09 PM MDTWinter Weather AdvisoryMSO22 hr
Nov 6, 4:21 AM MSTWinter Storm WatchMSO49 hr
Nov 7, 12:04 PM MSTWinter Weather AdvisoryMSO53 hr
Nov 19, 9:41 AM MSTWinter Weather AdvisoryMSO3 hr
Nov 20, 2:06 PM MSTWinter Weather AdvisoryMSO39 hr
Nov 23, 10:54 AM MSTWinter Weather AdvisoryMSO41 hr
Nov 29, 1:58 AM MSTWinter Weather AdvisoryMSO7 hr
Nov 30, 1:10 PM MSTWinter Storm WatchMSO23 hr
Dec 1, 12:07 PM MSTWinter Storm WarningMSO31 hr
Dec 2, 7:04 PM MSTWinter Weather AdvisoryMSO16 hr
Dec 6, 10:22 AM MSTWinter Weather AdvisoryMSO52 hr
Dec 7, 7:23 PM MSTWinter Storm WarningMSO13 hr
Dec 9, 2:16 PM MSTWinter Weather AdvisoryMSO19 hr
Dec 11, 1:51 PM MSTWinter Weather AdvisoryMSO21 hr
Dec 15, 2:57 PM MSTWinter Weather AdvisoryMSO60 hr
Dec 16, 12:35 PM MSTWinter Storm WarningMSO33 hr
Dec 18, 2:39 PM MSTWinter Weather AdvisoryMSO44 hr
Dec 23, 2:08 PM MSTWinter Weather AdvisoryMSO33 hr
Dec 23, 5:21 PM MSTWinter Storm WarningMSO30 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 archive20112013

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.