Alert archive / Montana / Granite County

Weather alerts in Granite County, Montana, 2011

145 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Granite County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts
145
Warnings
33
Watches
18
Advisories
76
Busiest month
February22 alerts
Busiest day
July 13, 20116 alerts

Over time

By month

Warning verification

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

Granite County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings10100%0
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 2, 1:02 PM MSTWinter Weather AdvisoryMSO19 hr
Jan 4, 2:49 PM MSTWinter Weather AdvisoryMSO20 hr
Jan 7, 4:00 AM MSTWinter Weather AdvisoryMSO64 hr
Jan 9, 10:09 AM MSTWinter Weather AdvisoryMSO13 hr
Jan 11, 3:58 AM MSTWinter Storm WarningMSO61 hr
Jan 11, 3:00 PM MSTWinter Weather AdvisoryMSO50 hr
Jan 13, 10:07 PM MSTFreezing Rain AdvisoryMSO11 hr
Jan 16, 3:32 PM MSTWind AdvisoryMSO22 hr
Jan 18, 3:21 AM MSTWinter Weather AdvisoryMSO30 hr
Jan 20, 2:01 PM MSTWinter Storm WatchMSO13 hr
Jan 20, 3:41 PM MSTWinter Weather AdvisoryMSO4 hr
Jan 21, 3:29 AM MSTWinter Storm WarningMSO29 hr
Jan 21, 3:29 AM MSTWinter Weather AdvisoryMSO26 hr
Jan 24, 10:51 PM MSTWinter Weather AdvisoryMSO12 hr
Jan 28, 3:21 AM MSTWinter Storm WatchMSO23 hr
Jan 28, 3:03 PM MSTWinter Weather AdvisoryMSO55 hr
Jan 29, 2:45 AM MSTWinter Storm WarningMSO38 hr
Jan 30, 3:00 PM MSTWind Chill WarningMSO22 hr
Feb 3, 1:32 PM MSTWinter Weather AdvisoryMSO30 hr
Feb 5, 2:22 PM MSTWind AdvisoryMSO44 hr
Feb 5, 3:04 PM MSTWinter Storm WatchMSO13 hr
Feb 6, 4:13 AM MSTWinter Storm WarningMSO53 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 11, 2:09 PM MSTWinter Weather AdvisoryMSO43 hr
Feb 12, 4:09 AM MSTHigh Wind WarningMSO29 hr
Feb 14, 1:53 PM MSTWinter Storm WarningMSO57 hr
Feb 14, 1:53 PM MSTWinter Weather AdvisoryMSO3 days
Feb 15, 2:24 PM MSTWinter Storm WarningMSO39 hr
Feb 18, 7:25 AM MSTWinter Weather AdvisoryMSO3 hr
Feb 19, 6:14 PM MSTWinter Weather AdvisoryMSO34 hr
Feb 21, 4:31 AM MSTWinter Weather AdvisoryMSO52 hr
Feb 21, 2:36 PM MSTWinter Storm WarningMSO72 hr
Feb 23, 5:18 AM MSTWinter Weather AdvisoryMSO54 hr
Feb 24, 7:34 AM MSTWind Chill WarningMSO25 hr
Feb 25, 1:22 PM MSTWinter Storm WatchMSO25 hr
Feb 26, 1:57 PM MSTWind AdvisoryMSO56 hr
Feb 26, 1:58 PM MSTWinter Storm WarningMSO3 days
Feb 26, 1:58 PM MSTWinter Weather AdvisoryMSO69 hr
Mar 4, 7:14 AM MSTWinter Weather AdvisoryMSO3 hr
Mar 5, 9:05 AM MSTWinter Weather AdvisoryMSO3 hr
Mar 10, 9:56 AM MSTWinter Weather AdvisoryMSO23 hr
Mar 14, 3:06 AM MDTWinter Storm WarningMSO5 hr
Mar 14, 2:37 PM MDTWinter Weather AdvisoryMSO42 hr
Mar 16, 2:29 PM MDTWinter Weather AdvisoryMSO16 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 30, 9:48 AM MDTWinter Weather AdvisoryMSO5 hr
Mar 31, 9:43 AM MDTHigh Wind WarningMSO7 hr
Apr 1, 11:31 AM MDTWinter Weather AdvisoryMSO48 hr
Apr 3, 2:37 PM MDTWinter Weather AdvisoryMSO45 hr
Apr 5, 3:55 AM MDTWind AdvisoryMSO16 hr
Apr 5, 2:13 PM MDTWinter Weather AdvisoryMSO3 days
Apr 10, 1:59 PM MDTWinter Weather AdvisoryMSO31 hr
Apr 13, 6:46 PM MDTWinter Weather AdvisoryMSO8 hr
Apr 14, 2:01 PM MDTWinter Weather AdvisoryMSO22 hr
Apr 15, 1:59 PM MDTWinter Weather AdvisoryMSO20 hr
Apr 18, 12:49 PM MDTWinter Weather AdvisoryMSO21 hr
Apr 20, 2:13 PM MDTWinter Weather AdvisoryMSO44 hr
Apr 25, 2:22 PM MDTWinter Weather AdvisoryMSO20 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 8, 1:58 PM MDTWinter Weather AdvisoryMSO19 hr
May 9, 6:55 PM MDTWinter Weather AdvisoryMSO8 hr
May 24, 4:37 PM MDTAreal Flood AdvisoryMSO68 hr
May 25, 3:12 AM MDTWinter Weather AdvisoryMSO54 hr
May 25, 7:12 AM MDTAreal Flood WarningMSO53 hr
May 28, 2:27 PM MDTWinter Weather AdvisoryMSO55 hr
Jun 1, 2:51 PM MDTFlood WatchMSO46 hr
Jun 6, 10:40 AM MDTFlood WatchMSO71 hr
Jun 6, 4:13 PM MDTSevere Thunderstorm WatchSPC6 hr
Jun 7, 9:59 AM MDTAreal Flood WarningMSO3 days
Jun 7, 12:30 PM MDTAreal Flood WarningMSO47 hr
Jun 7, 5:26 PM MDTAreal Flood WarningMSO10 days
Jun 9, 11:42 AM MDTAreal Flood AdvisoryMSO4 days
Jun 9, 12:31 PM MDTAreal Flood WarningMSO7 days
Jun 19, 6:39 PM MDTAreal Flood WarningMSO33 min
Jun 22, 12:16 PM MDTFlood WatchMSO68 hr
Jun 23, 12:16 PM MDTMesoscale DiscussionSPC59 min
Jun 23, 12:55 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 28, 4:33 PM MDTMesoscale DiscussionSPC117 min
Jun 29, 12:35 PM MDTMesoscale DiscussionSPC115 min
Jun 29, 2:45 PM MDTSpecial Weather StatementMSO45 min
Jul 7, 11:43 AM MDTWind AdvisoryMSO33 hr
Jul 12, 12:56 PM MDTMesoscale DiscussionSPC64 min
Jul 12, 1:38 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 12, 4:27 PM MDTSevere Thunderstorm WarningMSO48 min
Jul 12, 5:30 PM MDTMesoscale DiscussionSPC60 min
Jul 12, 7:17 PM MDTMesoscale DiscussionSPC58 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, 5:11 PM MDTAreal Flood AdvisoryMSO3 hr
Jul 13, 5:13 PM MDTMesoscale DiscussionSPC62 min
Jul 16, 2:04 PM MDTMesoscale DiscussionSPC56 min
Jul 19, 3:38 PM MDTWind AdvisoryMSO5 hr
Jul 19, 7:51 PM MDTSpecial Weather StatementMSO39 min
Jul 25, 1:44 PM MDTSpecial Weather StatementMSO31 min
Jul 25, 2:23 PM MDTMesoscale DiscussionSPC97 min
Jul 31, 4:20 PM MDTSpecial Weather StatementMSO40 min
Jul 31, 7:57 PM MDTSpecial Weather StatementMSO48 min
Aug 13, 7:59 PM MDTSpecial Weather StatementMSO61 min
Aug 13, 9:05 PM MDTSpecial Weather StatementMSO55 min
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 14, 10:55 AM MDTWinter Weather AdvisoryMSO19 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 9, 2:11 PM MSTWinter Storm WatchMSO22 hr
Nov 10, 12:24 PM MSTWinter Storm WarningMSO45 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, 2:10 PM MSTWinter Storm WatchMSO14 hr
Nov 15, 6:35 PM MSTWinter Weather AdvisoryMSO9 hr
Nov 16, 3:54 AM MSTWinter Storm WarningMSO43 hr
Nov 17, 7:57 AM MSTWind AdvisoryMSO6 hr
Nov 17, 2:36 PM MSTWinter Weather AdvisoryMSO38 hr
Nov 18, 8:31 AM MSTWinter Storm WarningMSO20 hr
Nov 20, 4:27 AM MSTWinter Weather AdvisoryMSO6 hr
Nov 21, 3:42 AM MSTWinter Storm WarningMSO7 hr
Nov 21, 10:27 AM MSTWinter Weather AdvisoryMSO31 hr
Nov 23, 1:48 PM MSTWinter Weather AdvisoryMSO48 hr
Nov 28, 2:44 PM MSTWinter Storm WatchMSO14 hr
Nov 29, 4:38 AM MSTWinter Storm WarningMSO36 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, 3:15 AM MSTWinter Weather AdvisoryMSO57 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.