Alert archive / Montana / Chouteau County

Weather alerts in Chouteau County, Montana, 2011

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

Chouteau County and its neighbors

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

Alerts
84
Warnings
36
Watches
15
Advisories
2
Busiest month
July28 alerts
Busiest day
June 29, 20118 alerts

Over time

By month

Warning verification

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

Chouteau County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings18950%757%15 min
Flash flood warnings10100%0

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Great Falls, MT: severe thunderstorm warnings582655%7152%18 min
NWS Great Falls, MT: flash flood warnings6183%250%3 min

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
Feb 25, 6:45 PM MSTAreal Flood WarningTFX64 hr
Mar 12, 1:58 PM MSTAreal Flood AdvisoryTFX47 hr
Mar 14, 2:04 PM MDTAreal Flood WarningTFX7 days
May 20, 11:00 AM MDTAreal Flood WarningTFX22 hr
May 21, 8:59 AM MDTAreal Flood WarningTFX6 hr
May 21, 3:25 PM MDTAreal Flood WarningTFX48 hr
May 22, 8:21 AM MDTAreal Flood WarningTFX36 days
Jun 1, 8:00 PM MDTSpecial Weather StatementTFX60 min
Jun 1, 9:30 PM MDTSpecial Weather StatementTFX60 min
Jun 1, 11:05 PM MDTSevere Thunderstorm WarningTFX55 min
Jun 1, 11:45 PM MDTSevere Thunderstorm WarningTFX50 min
Jun 2, 4:34 AM MDTSpecial Weather StatementTFX56 min
Jun 2, 5:18 AM MDTSevere Thunderstorm WarningTFX57 min
Jun 6, 4:13 PM MDTSevere Thunderstorm WatchSPC6 hr
Jun 6, 4:48 PM MDTSevere Thunderstorm WarningTFX42 min
Jun 6, 6:44 PM MDTSevere Thunderstorm WarningTFX46 min
Jun 6, 8:59 PM MDTMesoscale DiscussionSPC61 min
Jun 23, 12:55 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 23, 3:44 PM MDTSevere Thunderstorm WarningTFX61 min
Jun 23, 4:50 PM MDTMesoscale DiscussionSPC85 min
Jun 23, 5:12 PM MDTSpecial Weather StatementTFX63 min
Jun 28, 6:33 PM MDTSevere Thunderstorm WarningTFX42 min
Jun 28, 6:54 PM MDTSpecial Weather StatementTFX51 min
Jun 28, 7:17 PM MDTSpecial Weather StatementTFX58 min
Jun 28, 8:14 PM MDTSpecial Weather StatementTFX31 min
Jun 29, 12:35 PM MDTMesoscale DiscussionSPC115 min
Jun 29, 3:27 PM MDTSevere Thunderstorm WarningTFX34 min
Jun 29, 3:46 PM MDTSevere Thunderstorm WatchSPC5 hr
Jun 29, 4:00 PM MDTSpecial Weather StatementTFX45 min
Jun 29, 6:17 PM MDTMesoscale DiscussionSPC118 min
Jul 3, 12:31 PM MDTMesoscale DiscussionSPC2 hr
Jul 3, 4:08 PM MDTSevere Thunderstorm WatchSPC8 hr
Jul 7, 9:08 PM MDTSevere Thunderstorm WarningTFX52 min
Jul 12, 1:38 PM MDTSevere Thunderstorm WatchSPC7 hr
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, 1:45 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 13, 5:00 PM MDTSevere Thunderstorm WarningTFX45 min
Jul 13, 5:13 PM MDTMesoscale DiscussionSPC62 min
Jul 13, 6:08 PM MDTSevere Thunderstorm WarningTFX37 min
Jul 13, 6:40 PM MDTAreal Flood AdvisoryTFX5 hr
Jul 13, 6:54 PM MDTFlash Flood WarningTFX5 hr
Jul 13, 7:12 PM MDTSevere Thunderstorm WarningTFX48 min
Jul 13, 7:33 PM MDTMesoscale DiscussionSPC57 min
Jul 16, 4:14 PM MDTMesoscale DiscussionSPC61 min
Jul 16, 8:17 PM MDTSevere Thunderstorm WarningTFX43 min
Jul 16, 8:36 PM MDTSevere Thunderstorm WarningTFX54 min
Jul 19, 2:49 PM MDTMesoscale DiscussionSPC86 min
Jul 19, 3:14 PM MDTSpecial Weather StatementTFX46 min
Jul 19, 3:34 PM MDTSpecial Weather StatementTFX41 min
Jul 19, 4:01 PM MDTSpecial Weather StatementTFX44 min
Jul 19, 4:07 PM MDTSevere Thunderstorm WarningTFX38 min
Jul 25, 2:23 PM MDTMesoscale DiscussionSPC97 min
Jul 25, 5:32 PM MDTSevere Thunderstorm WarningTFX43 min
Jul 25, 5:47 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 25, 6:20 PM MDTSpecial Weather StatementTFX40 min
Jul 30, 5:35 PM MDTSevere Thunderstorm WarningTFX40 min
Aug 3, 4:53 PM MDTSpecial Weather StatementTFX67 min
Aug 3, 5:27 PM MDTSpecial Weather StatementTFX48 min
Aug 3, 5:29 PM MDTSpecial Weather StatementTFX31 min
Aug 11, 4:25 PM MDTSpecial Weather StatementTFX50 min
Aug 14, 9:26 PM MDTRed Flag WarningTFX24 hr
Aug 14, 10:35 PM MDTSevere Thunderstorm WarningTFX40 min
Aug 14, 10:36 PM MDTSpecial Weather StatementTFX39 min
Aug 16, 3:15 PM MDTRed Flag WarningTFX30 hr
Aug 19, 3:18 PM MDTFire Weather WatchTFX48 hr
Aug 20, 3:06 PM MDTRed Flag WarningTFX4 days
Aug 24, 2:45 PM MDTFire Weather WatchTFX13 hr
Aug 25, 4:12 AM MDTRed Flag WarningTFX17 hr
Aug 26, 3:31 PM MDTFire Weather WatchTFX13 hr
Aug 26, 3:54 PM MDTMesoscale DiscussionSPC96 min
Aug 26, 4:26 PM MDTSevere Thunderstorm WatchSPC5 hr
Sep 10, 3:23 AM MDTFire Weather WatchTFX24 hr
Sep 11, 3:17 AM MDTRed Flag WarningTFX19 hr
Sep 24, 6:26 PM MDTFire Weather WatchTFX10 hr
Sep 25, 4:54 AM MDTRed Flag WarningTFX17 hr
Sep 27, 4:23 AM MDTRed Flag WarningTFX17 hr
Sep 29, 3:38 AM MDTRed Flag WarningTFX17 hr
Sep 30, 4:14 AM MDTRed Flag WarningTFX16 hr
Sep 30, 8:08 PM MDTFire Weather WatchTFX8 hr
Oct 1, 4:15 AM MDTRed Flag WarningTFX17 hr
Nov 26, 2:45 PM MSTFire Weather WatchTFX13 hr
Nov 27, 3:48 AM MSTRed Flag WarningTFX24 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.