Alert archive / Montana / Silver Bow County

Weather alerts in Silver Bow County, Montana, 2011

86 weather alerts in 2011, 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 2011. Tap one for its archive.

Alerts
86
Warnings
15
Watches
8
Advisories
43
Busiest month
July19 alerts
Busiest day
July 13, 20115 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, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings110%1100%1 min
Flash flood warnings00

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: severe thunderstorm warnings17947%2560%16 min
NWS Missoula, MT: flash flood warnings40100%0

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 16, 3:32 PM MSTWind AdvisoryMSO22 hr
Jan 18, 3:21 AM MSTWinter Weather AdvisoryMSO30 hr
Jan 28, 3:03 PM MSTWinter Weather AdvisoryMSO55 hr
Jan 30, 3:00 PM MSTWind Chill WarningMSO22 hr
Feb 5, 2:22 PM MSTWind AdvisoryMSO44 hr
Feb 6, 4:13 AM MSTWinter Weather AdvisoryMSO61 hr
Feb 7, 11:02 PM MSTWind Chill AdvisoryMSO10 hr
Feb 11, 2:03 PM MSTWind AdvisoryMSO44 hr
Feb 12, 4:09 AM MSTHigh Wind WarningMSO29 hr
Feb 14, 1:53 PM MSTWinter Weather AdvisoryMSO3 days
Feb 19, 6:14 PM MSTWinter Weather AdvisoryMSO34 hr
Feb 21, 2:36 PM MSTWinter Storm WarningMSO72 hr
Feb 24, 7:34 AM MSTWind Chill WarningMSO25 hr
Feb 26, 1:57 PM MSTWind AdvisoryMSO56 hr
Mar 5, 9:05 AM MSTWinter Weather AdvisoryMSO3 hr
Mar 14, 2:37 PM MDTWinter Weather AdvisoryMSO42 hr
Mar 21, 3:14 AM MDTWinter Weather AdvisoryMSO33 hr
Mar 21, 11:50 AM MDTWinter Storm WarningMSO24 hr
Mar 27, 7:26 AM MDTWinter Weather AdvisoryMSO5 hr
Mar 29, 2:10 PM MDTWind AdvisoryMSO51 hr
Mar 31, 9:43 AM MDTHigh Wind WarningMSO7 hr
Apr 5, 3:55 AM MDTWind AdvisoryMSO16 hr
Apr 5, 2:13 PM MDTWinter Weather AdvisoryMSO3 days
Apr 13, 6:46 PM MDTWinter Weather AdvisoryMSO8 hr
Apr 28, 3:13 AM MDTWinter Weather AdvisoryMSO51 hr
May 7, 9:01 PM MDTWinter Storm WatchMSO17 hr
May 8, 1:58 PM MDTWinter Storm WarningMSO22 hr
May 9, 6:55 PM MDTWinter Weather AdvisoryMSO8 hr
May 24, 4:37 PM MDTAreal Flood AdvisoryMSO68 hr
May 28, 2:27 PM MDTWinter Weather AdvisoryMSO55 hr
Jun 6, 10:40 AM MDTFlood WatchMSO71 hr
Jun 6, 2:13 PM MDTMesoscale DiscussionSPC2 hr
Jun 6, 4:13 PM MDTSevere Thunderstorm WatchSPC6 hr
Jun 9, 9:44 AM MDTAreal Flood WarningMSO24 hr
Jun 18, 2:14 PM MDTAreal Flood AdvisoryMSO17 hr
Jun 28, 4:33 PM MDTMesoscale DiscussionSPC117 min
Jun 29, 12:35 PM MDTMesoscale DiscussionSPC115 min
Jun 29, 1:49 PM MDTSpecial Weather StatementMSO26 min
Jul 7, 11:43 AM MDTWind AdvisoryMSO33 hr
Jul 11, 2:53 PM MDTMesoscale DiscussionSPC97 min
Jul 11, 2:58 PM MDTSpecial Weather StatementTFX47 min
Jul 12, 12:56 PM MDTMesoscale DiscussionSPC64 min
Jul 12, 1:38 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 12, 5:30 PM MDTMesoscale DiscussionSPC60 min
Jul 13, 12:36 PM MDTMesoscale DiscussionSPC114 min
Jul 13, 12:45 PM MDTFlash Flood WatchMSO7 hr
Jul 13, 1:45 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 13, 3:54 PM MDTSpecial Weather StatementMSO51 min
Jul 13, 5:13 PM MDTMesoscale DiscussionSPC62 min
Jul 14, 6:17 AM MDTSpecial Weather StatementMSO43 min
Jul 14, 7:25 AM MDTSevere Thunderstorm WarningMSO50 min
Jul 14, 7:34 AM MDTAreal Flood AdvisoryMSO87 min
Jul 14, 7:41 AM MDTSpecial Weather StatementTFX49 min
Jul 16, 2:04 PM MDTMesoscale DiscussionSPC56 min
Jul 19, 3:38 PM MDTWind AdvisoryMSO5 hr
Jul 25, 2:23 PM MDTMesoscale DiscussionSPC97 min
Jul 30, 2:38 PM MDTSpecial Weather StatementMSO37 min
Aug 13, 7:59 PM MDTSpecial Weather StatementMSO61 min
Aug 13, 9:05 PM MDTSpecial Weather StatementMSO55 min
Aug 15, 1:38 PM MDTMesoscale DiscussionSPC2 hr
Aug 24, 3:02 PM MDTFire Weather WatchMSO13 hr
Aug 25, 3:54 AM MDTRed Flag WarningMSO16 hr
Aug 26, 3:54 PM MDTMesoscale DiscussionSPC96 min
Aug 28, 2:52 AM MDTRed Flag WarningMSO26 hr
Aug 29, 2:16 PM MDTRed Flag WarningMSO30 hr
Sep 5, 3:02 AM MDTRed Flag WarningMSO21 hr
Sep 6, 3:31 AM MDTRed Flag WarningMSO18 hr
Sep 24, 2:25 PM MDTFire Weather WatchMSO14 hr
Sep 25, 4:51 AM MDTRed Flag WarningMSO16 hr
Oct 28, 11:07 AM MDTWind AdvisoryMSO19 hr
Oct 29, 3:18 PM MDTWind AdvisoryMSO4 hr
Nov 3, 2:26 PM MDTWinter Weather AdvisoryMSO46 hr
Nov 10, 12:24 PM MSTWinter Weather AdvisoryMSO45 hr
Nov 12, 1:50 PM MSTWinter Weather AdvisoryMSO69 hr
Nov 13, 4:21 PM MSTWind AdvisoryMSO4 hr
Nov 15, 6:35 PM MSTWinter Weather AdvisoryMSO9 hr
Nov 17, 7:57 AM MSTWind AdvisoryMSO6 hr
Nov 17, 2:36 PM MSTWinter Weather AdvisoryMSO38 hr
Nov 23, 1:48 PM MSTWinter Weather AdvisoryMSO48 hr
Nov 29, 4:38 AM MSTWinter Weather AdvisoryMSO36 hr
Dec 3, 2:08 PM MSTWinter Weather AdvisoryMSO21 hr
Dec 9, 2:47 PM MSTDense Fog AdvisoryMSO20 hr
Dec 10, 2:44 PM MSTDense Fog AdvisoryMSO17 hr
Dec 20, 2:45 PM MSTWinter Weather AdvisoryMSO24 hr
Dec 27, 2:19 PM MSTWind AdvisoryMSO48 hr
Dec 29, 2:30 PM MSTWinter Weather AdvisoryMSO42 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 archive20102012

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.