Alert archive / Montana / Silver Bow County

Weather alerts in Silver Bow County, Montana, 2017

116 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts
116
Warnings
25
Watches
9
Advisories
44
Busiest month
July25 alerts
Busiest day
July 10, 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.

Silver Bow County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings3233%367%13 min
Flash flood warnings00

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: tornado warnings010%
NWS Missoula, MT: severe thunderstorm warnings13838%2438%20 min
NWS Missoula, MT: flash flood warnings010%

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, 4:57 AM MSTWinter Storm WarningMSO14 hr
Jan 2, 3:41 AM MSTWind Chill WarningMSO31 hr
Jan 7, 2:35 PM MSTWinter Weather AdvisoryMSO50 hr
Jan 8, 3:35 AM MSTWinter Weather AdvisoryMSO37 hr
Jan 9, 2:33 PM MSTSpecial Weather StatementMSO57 min
Jan 10, 1:31 PM MSTWinter Weather AdvisoryMSO21 hr
Jan 29, 2:29 PM MSTWinter Storm WatchMSO39 days
Jan 30, 12:07 PM MSTWinter Storm WarningMSO40 hr
Jan 31, 6:04 AM MSTWinter Weather AdvisoryMSO29 hr
Feb 1, 2:36 PM MSTWinter Weather AdvisoryMSO23 hr
Feb 2, 1:54 PM MSTWinter Weather AdvisoryMSO69 hr
Feb 6, 11:09 AM MSTWinter Weather AdvisoryMSO21 hr
Feb 7, 9:24 AM MSTWinter Weather AdvisoryMSO24 hr
Feb 8, 11:42 AM MSTWinter Weather AdvisoryMSO23 hr
Feb 10, 10:18 PM MSTWinter Weather AdvisoryMSO12 hr
Feb 25, 1:58 PM MSTWinter Weather AdvisoryMSO46 hr
Feb 28, 2:14 PM MSTWind AdvisoryMSO30 hr
Mar 4, 1:37 PM MSTWinter Storm WarningMSO31 hr
Mar 5, 8:57 PM MSTWinter Weather AdvisoryMSO4 hr
Mar 6, 2:54 PM MSTWinter Weather AdvisoryMSO19 hr
Mar 7, 2:42 PM MSTWinter Weather AdvisoryMSO20 hr
Mar 8, 2:04 PM MSTWinter Weather AdvisoryMSO23 hr
Mar 9, 7:54 AM MSTWinter Storm WarningMSO5 hr
Mar 9, 3:06 PM MSTWinter Weather AdvisoryMSO23 hr
Mar 21, 4:47 PM MDTAreal Flood WarningMSO24 hr
Mar 29, 2:26 PM MDTWinter Weather AdvisoryMSO41 hr
Apr 3, 6:40 PM MDTSpecial Weather StatementMSO95 min
Apr 7, 9:35 PM MDTWinter Weather AdvisoryMSO38 hr
Apr 13, 2:43 PM MDTWinter Weather AdvisoryMSO33 hr
May 6, 2:14 PM MDTSpecial Weather StatementTFX46 min
May 6, 2:31 PM MDTSpecial Weather StatementMSO44 min
May 6, 3:42 PM MDTMesoscale DiscussionSPC63 min
May 6, 8:45 PM MDTSpecial Weather StatementMSO75 min
May 6, 9:00 PM MDTSpecial Weather StatementTFX30 min
May 12, 1:35 PM MDTMesoscale DiscussionSPC2 hr
May 15, 12:54 PM MDTWinter Storm WatchMSO24 hr
May 16, 1:14 PM MDTWinter Storm WarningMSO38 hr
May 23, 9:54 AM MDTHigh Wind WatchMSO17 hr
May 23, 9:54 AM MDTWind AdvisoryMSO35 hr
Jun 1, 12:42 PM MDTMesoscale DiscussionSPC3 hr
Jun 4, 2:28 PM MDTSpecial Weather StatementMSO32 min
Jun 10, 2:03 PM MDTFlood WatchMSO3 days
Jun 12, 11:23 AM MDTMesoscale DiscussionSPC3 hr
Jun 12, 3:18 PM MDTSpecial Weather StatementMSO57 min
Jun 12, 4:13 PM MDTSpecial Weather StatementMSO62 min
Jun 12, 4:33 PM MDTAreal Flood AdvisoryMSO57 min
Jun 12, 7:36 PM MDTAreal Flood AdvisoryMSO24 hr
Jun 13, 7:54 PM MDTFlood WatchMSO10 hr
Jun 26, 8:59 PM MDTSpecial Weather StatementMSO16 min
Jun 28, 12:39 PM MDTMesoscale DiscussionSPC3 hr
Jul 1, 6:24 PM MDTSpecial Weather StatementTFX51 min
Jul 1, 7:20 PM MDTSpecial Weather StatementTFX40 min
Jul 2, 5:57 AM MDTSpecial Weather StatementMSO48 min
Jul 5, 4:23 PM MDTSpecial Weather StatementMSO37 min
Jul 5, 4:54 PM MDTSpecial Weather StatementMSO36 min
Jul 5, 5:06 PM MDTSpecial Weather StatementMSO24 min
Jul 8, 1:09 PM MDTSpecial Weather StatementMSO51 min
Jul 8, 1:55 PM MDTSpecial Weather StatementMSO50 min
Jul 9, 2:21 PM MDTSpecial Weather StatementMSO84 min
Jul 10, 1:10 PM MDTSpecial Weather StatementTFX50 min
Jul 10, 1:20 PM MDTMesoscale DiscussionSPC115 min
Jul 10, 1:29 PM MDTSpecial Weather StatementMSO46 min
Jul 10, 1:56 PM MDTSpecial Weather StatementTFX49 min
Jul 10, 2:28 PM MDTSpecial Weather StatementTFX32 min
Jul 10, 3:00 PM MDTSpecial Weather StatementTFX45 min
Jul 10, 3:12 PM MDTSevere Thunderstorm WarningMSO33 min
Jul 10, 4:16 PM MDTSevere Thunderstorm WarningMSO29 min
Jul 10, 4:20 PM MDTSpecial Weather StatementMSO25 min
Jul 10, 4:22 PM MDTSevere Thunderstorm WarningMSO23 min
Jul 10, 7:24 PM MDTSpecial Weather StatementTFX36 min
Jul 10, 7:29 PM MDTSpecial Weather StatementMSO16 min
Jul 15, 2:07 PM MDTMesoscale DiscussionSPC53 min
Jul 19, 2:14 PM MDTRed Flag WarningMSO31 hr
Jul 24, 9:31 PM MDTSpecial Weather StatementTFX44 min
Jul 28, 7:26 PM MDTSpecial Weather StatementMSO19 min
Aug 9, 3:10 PM MDTSpecial Weather StatementMSO35 min
Aug 11, 1:03 PM MDTRed Flag WarningMSO56 hr
Aug 17, 11:56 AM MDTRed Flag WarningMSO57 hr
Aug 18, 2:03 PM MDTRed Flag WarningMSO31 hr
Aug 24, 8:59 AM MDTRed Flag WarningMSO14 hr
Aug 24, 2:14 PM MDTMesoscale DiscussionSPC3 hr
Aug 25, 8:18 AM MDTRed Flag WarningMSO11 hr
Aug 29, 12:49 PM MDTRed Flag WarningMSO56 hr
Sep 2, 1:45 PM MDTRed Flag WarningMSO45 hr
Sep 7, 1:48 PM MDTFire Weather WatchMSO22 hr
Sep 8, 11:57 AM MDTRed Flag WarningMSO33 hr
Sep 12, 2:02 PM MDTRed Flag WarningMSO29 hr
Sep 12, 2:03 PM MDTWinter Storm WatchMSO43 hr
Sep 14, 9:29 AM MDTWinter Storm WarningMSO45 hr
Sep 19, 10:55 PM MDTWinter Weather AdvisoryMSO13 hr
Sep 21, 3:33 AM MDTWinter Weather AdvisoryMSO44 hr
Oct 1, 2:25 PM MDTWinter Storm WarningMSO40 hr
Oct 1, 2:25 PM MDTWinter Weather AdvisoryMSO43 hr
Oct 6, 11:31 AM MDTWind AdvisoryMSO30 hr
Oct 12, 1:11 PM MDTWinter Weather AdvisoryMSO30 hr
Oct 16, 2:37 PM MDTWind AdvisoryMSO33 hr
Oct 21, 2:30 PM MDTWind AdvisoryMSO30 hr
Oct 24, 1:08 PM MDTWind AdvisoryMSO29 hr
Oct 26, 4:22 AM MDTWinter Weather AdvisoryMSO4 hr
Oct 31, 2:38 PM MDTWinter Weather AdvisoryMSO4 days
Nov 1, 9:14 PM MDTWinter Weather AdvisoryMSO11 hr
Nov 3, 8:38 AM MDTWinter Storm WarningMSO24 hr
Nov 4, 2:35 PM MDTWinter Weather AdvisoryMSO45 hr
Nov 13, 3:30 AM MSTWinter Weather AdvisoryMSO30 hr
Nov 21, 1:14 PM MSTHigh Wind WatchMSO38 hr
Nov 23, 3:27 AM MSTWind AdvisoryMSO25 hr
Dec 2, 3:26 AM MSTWinter Weather AdvisoryMSO44 hr
Dec 13, 6:15 AM MSTWinter Weather AdvisoryMSO14 hr
Dec 14, 2:27 PM MSTWinter Weather AdvisoryMSO45 hr
Dec 19, 4:45 AM MSTWinter Weather AdvisoryMSO39 hr
Dec 21, 4:03 AM MSTWinter Weather AdvisoryMSO53 hr
Dec 22, 3:50 PM MSTWinter Storm WarningMSO7 hr
Dec 24, 3:31 AM MSTWinter Weather AdvisoryMSO43 hr
Dec 27, 4:40 AM MSTWinter Storm WatchMSO23 hr
Dec 27, 3:02 PM MSTWinter Storm WarningMSO3 days
Dec 30, 12:47 PM MSTWinter Weather AdvisoryMSO10 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.