Alert archive / Montana / Silver Bow County

Weather alerts in Silver Bow County, Montana, 2015

85 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Silver Bow County and its neighbors

Each county as a circle sized by its count in 2015. Tap one for its archive.

Alerts
85
Warnings
15
Watches
11
Advisories
44
Busiest month
November14 alerts
Busiest day
June 16, 20155 alerts

Over time

By month

Warning verification

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

Silver Bow County, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings2150%2100%6 min
Flash flood warnings00

Each office's whole area, 2015

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: severe thunderstorm warnings19858%1867%14 min
NWS Missoula, MT: flash flood warnings10100%30%

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 1, 2:33 PM MSTWinter Weather AdvisoryMSO44 hr
Jan 2, 2:41 PM MSTWinter Storm WatchMSO46 hr
Jan 3, 2:04 PM MSTWinter Storm WarningMSO23 hr
Jan 3, 2:04 PM MSTWinter Weather AdvisoryMSO23 hr
Jan 4, 12:54 PM MSTWinter Storm WarningMSO64 hr
Jan 8, 1:52 PM MSTWind Chill AdvisoryMSO18 hr
Jan 10, 12:22 PM MSTWinter Weather AdvisoryMSO25 hr
Jan 19, 9:39 AM MSTWinter Weather AdvisoryMSO23 hr
Feb 1, 4:07 AM MSTWinter Weather AdvisoryMSO29 hr
Feb 3, 4:15 AM MSTWinter Weather AdvisoryMSO30 hr
Feb 8, 9:22 PM MSTWinter Weather AdvisoryMSO37 hr
Feb 19, 10:45 AM MSTWinter Weather AdvisoryMSO24 hr
Feb 20, 2:20 PM MSTWinter Weather AdvisoryMSO21 hr
Feb 21, 2:16 PM MSTWind Chill AdvisoryMSO21 hr
Feb 24, 2:37 PM MSTWinter Weather AdvisoryMSO23 hr
Feb 25, 8:55 PM MSTWinter Weather AdvisoryMSO15 hr
Feb 27, 11:49 AM MSTWind Chill AdvisoryMSO23 hr
Feb 27, 11:49 AM MSTWinter Weather AdvisoryMSO18 hr
Mar 1, 5:28 AM MSTWinter Weather AdvisoryMSO53 hr
Mar 2, 9:07 AM MSTWinter Storm WarningMSO17 hr
Mar 23, 2:59 PM MDTWinter Weather AdvisoryMSO42 hr
Mar 27, 9:46 AM MDTWind AdvisoryMSO35 hr
Mar 31, 3:39 AM MDTWind AdvisoryMSO18 hr
Apr 4, 1:54 PM MDTWinter Weather AdvisoryMSO55 hr
Apr 11, 3:32 AM MDTWind AdvisoryMSO16 hr
Apr 13, 2:32 PM MDTWinter Weather AdvisoryMSO42 hr
Apr 14, 4:05 PM MDTWinter Storm WarningMSO5 hr
Apr 25, 2:14 PM MDTWinter Weather AdvisoryMSO20 hr
Apr 26, 9:55 AM MDTWinter Weather AdvisoryMSO3 hr
May 27, 12:14 PM MDTAreal Flood AdvisoryMSO6 hr
May 30, 2:00 PM MDTMesoscale DiscussionSPC2 hr
May 31, 4:23 PM MDTMesoscale DiscussionSPC97 min
Jun 1, 2:19 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 1, 4:31 PM MDTMesoscale DiscussionSPC59 min
Jun 15, 6:36 PM MDTSpecial Weather StatementMSO39 min
Jun 15, 7:53 PM MDTSevere Thunderstorm WarningMSO22 min
Jun 16, 12:43 PM MDTSpecial Weather StatementMSO47 min
Jun 16, 1:07 PM MDTAreal Flood AdvisoryMSO3 hr
Jun 16, 1:24 PM MDTSpecial Weather StatementMSO36 min
Jul 2, 12:39 PM MDTFire Weather WatchMSO24 hr
Jul 11, 1:13 PM MDTSpecial Weather StatementMSO47 min
Jul 23, 3:45 PM MDTSpecial Weather StatementMSO45 min
Jul 23, 3:59 PM MDTSevere Thunderstorm WarningMSO17 min
Jul 23, 4:05 PM MDTAreal Flood AdvisoryMSO3 hr
Aug 11, 4:08 PM MDTMesoscale DiscussionSPC67 min
Aug 14, 1:35 PM MDTMesoscale DiscussionSPC2 hr
Aug 14, 1:51 PM MDTFlash Flood WatchMSO6 hr
Aug 14, 2:23 PM MDTSevere Thunderstorm WatchSPC7 hr
Aug 19, 2:18 PM MDTFire Weather WatchMSO24 hr
Aug 20, 2:28 PM MDTRed Flag WarningMSO31 hr
Aug 27, 1:24 PM MDTFire Weather WatchMSO21 hr
Aug 27, 8:15 PM MDTSpecial Weather StatementMSO30 min
Aug 28, 10:33 AM MDTRed Flag WarningMSO34 hr
Aug 29, 3:54 PM MDTSpecial Weather StatementMSO36 min
Sep 1, 3:44 AM MDTFire Weather WatchMSO7 hr
Sep 1, 10:47 AM MDTRed Flag WarningMSO34 hr
Sep 4, 11:09 AM MDTWinter Weather AdvisoryMSO46 hr
Oct 2, 1:20 PM MDTWind AdvisoryMSO38 hr
Oct 9, 12:24 PM MDTWind AdvisoryMSO57 hr
Oct 25, 2:07 PM MDTWinter Weather AdvisoryMSO45 hr
Nov 2, 4:42 AM MSTWinter Storm WatchMSO10 hr
Nov 2, 4:42 AM MSTWinter Weather AdvisoryMSO51 hr
Nov 2, 2:35 PM MSTWinter Storm WarningMSO32 hr
Nov 5, 3:46 AM MSTWinter Weather AdvisoryMSO28 hr
Nov 8, 2:36 PM MSTWinter Weather AdvisoryMSO44 hr
Nov 10, 5:36 AM MSTWinter Storm WarningMSO5 hr
Nov 10, 2:47 PM MSTWinter Weather AdvisoryMSO41 hr
Nov 11, 6:23 PM MSTSpecial Weather StatementMSO82 min
Nov 16, 11:27 AM MSTHigh Wind WarningMSO44 hr
Nov 16, 11:31 AM MSTWinter Storm WarningMSO47 hr
Nov 18, 2:50 PM MSTWinter Weather AdvisoryMSO44 hr
Nov 22, 2:29 PM MSTWinter Storm WatchMSO24 hr
Nov 23, 2:09 PM MSTWinter Storm WarningMSO43 hr
Nov 25, 12:17 PM MSTWinter Weather AdvisoryMSO8 hr
Dec 4, 6:07 PM MSTSpecial Weather StatementMSO83 min
Dec 4, 6:41 PM MSTWinter Weather AdvisoryMSO14 hr
Dec 9, 8:19 AM MSTWind AdvisoryMSO9 hr
Dec 9, 11:54 AM MSTSpecial Weather StatementMSO66 min
Dec 10, 3:23 AM MSTWinter Weather AdvisoryMSO30 hr
Dec 11, 2:47 PM MSTWinter Storm WatchMSO24 hr
Dec 12, 2:45 PM MSTWinter Storm WarningMSO56 hr
Dec 15, 10:35 AM MSTWinter Weather AdvisoryMSO46 hr
Dec 17, 11:39 AM MSTWinter Weather AdvisoryMSO59 hr
Dec 20, 2:31 PM MSTWinter Weather AdvisoryMSO47 hr
Dec 28, 10:25 AM MSTWinter Weather AdvisoryMSO25 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 archive20142016

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.