Alert archive / Montana / Powell County

Weather alerts in Powell County, Montana, 2024

113 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Powell County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts
113
Warnings
28
Watches
19
Advisories
40
Busiest month
August22 alerts
Busiest day
August 23, 20247 alerts

Over time

By month

Warning verification

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

Powell County, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings110%450%12 min
Flash flood warnings00

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: severe thunderstorm warnings321941%10844%15 min
NWS Missoula, MT: flash flood warnings40100%20%

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 4, 11:07 AM MSTWinter Weather AdvisoryMSO25 hr
Jan 5, 1:08 PM MSTWinter Weather AdvisoryMSO49 hr
Jan 7, 2:57 PM MSTWinter Storm WarningMSO5 days
Jan 7, 2:57 PM MSTWinter Weather AdvisoryMSO68 hr
Jan 9, 2:29 PM MSTWinter Storm WatchMSO23 hr
Jan 10, 1:13 PM MSTWind Chill WarningMSO70 hr
Jan 10, 1:13 PM MSTWinter Storm WarningMSO46 hr
Jan 13, 12:17 PM MSTWind Chill WarningMSO23 hr
Jan 15, 2:11 PM MSTWinter Storm WatchMSO30 hr
Jan 15, 2:11 PM MSTWinter Storm WarningMSO67 hr
Jan 17, 12:49 PM MSTMesoscale DiscussionSPC4 hr
Jan 20, 5:12 AM MSTWinter Weather AdvisoryMSO30 hr
Jan 20, 6:39 PM MSTWinter Storm WarningMSO16 hr
Jan 21, 12:56 PM MSTWinter Weather AdvisoryMSO22 hr
Jan 22, 7:16 AM MSTWinter Storm WarningMSO4 hr
Jan 22, 12:54 PM MSTWinter Weather AdvisoryMSO22 hr
Feb 2, 3:04 AM MSTWinter Weather AdvisoryMSO62 hr
Feb 6, 11:41 AM MSTWinter Weather AdvisoryMSO3 days
Feb 8, 12:44 PM MSTWinter Weather AdvisoryMSO22 hr
Feb 9, 2:42 PM MSTSpecial Weather StatementMSO33 min
Feb 11, 12:00 PM MSTWinter Weather AdvisoryMSO65 hr
Feb 13, 1:52 PM MSTWinter Weather AdvisoryMSO66 hr
Feb 23, 10:03 AM MSTWinter Storm WatchMSO27 hr
Feb 23, 10:44 AM MSTHigh Wind WatchMSO26 hr
Feb 24, 12:44 PM MSTWinter Storm WarningMSO49 hr
Feb 24, 1:06 PM MSTHigh Wind WarningMSO46 hr
Feb 26, 10:47 AM MSTWinter Weather AdvisoryMSO24 hr
Feb 28, 10:17 AM MSTHigh Wind WarningMSO37 hr
Feb 28, 10:17 AM MSTWind AdvisoryMSO32 hr
Feb 29, 10:03 AM MSTWinter Weather AdvisoryMSO23 hr
Feb 29, 6:16 PM MSTSpecial Weather StatementMSO44 min
Mar 1, 1:52 PM MSTWinter Weather AdvisoryMSO39 hr
Mar 2, 7:01 PM MSTSpecial Weather StatementMSO59 min
Mar 20, 11:17 AM MDTWinter Weather AdvisoryMSO4 days
Mar 23, 5:43 PM MDTSnow Squall Warning Significant damage threatMSO62 min
Mar 24, 1:51 PM MDTWinter Weather AdvisoryMSO19 hr
Apr 5, 12:42 PM MDTWinter Weather AdvisoryMSO20 hr
Apr 16, 1:26 PM MDTWinter Weather AdvisoryMSO22 hr
Apr 26, 9:06 AM MDTWinter Weather AdvisoryMSO27 hr
Apr 28, 10:22 AM MDTWinter Weather AdvisoryMSO26 hr
May 6, 10:13 AM MDTWind AdvisoryMSO35 hr
May 6, 12:51 PM MDTWinter Weather AdvisoryMSO46 hr
May 15, 12:02 PM MDTWind AdvisoryMSO32 hr
May 16, 10:04 AM MDTWind AdvisoryMSO34 hr
May 17, 4:03 PM MDTSpecial Weather StatementMSO42 min
May 20, 10:19 AM MDTWinter Storm WatchMSO46 hr
May 22, 8:25 AM MDTWinter Storm WarningMSO28 hr
May 28, 1:13 PM MDTMesoscale DiscussionSPC3 hr
Jun 2, 12:20 PM MDTWind AdvisoryMSO33 hr
Jun 13, 2:11 PM MDTWinter Storm WatchMSO71 hr
Jun 15, 1:36 PM MDTWinter Storm WatchMSO24 hr
Jun 16, 1:07 PM MDTWinter Storm WarningMSO41 hr
Jun 20, 1:38 PM MDTMesoscale DiscussionSPC67 min
Jul 11, 2:03 PM MDTFire Weather WatchMSO21 hr
Jul 12, 10:37 AM MDTRed Flag WarningMSO34 hr
Jul 18, 11:50 AM MDTHeat AdvisoryMSO7 days
Jul 21, 3:04 PM MDTFire Weather WatchTFX71 hr
Jul 22, 1:26 PM MDTFire Weather WatchMSO25 hr
Jul 22, 2:35 PM MDTRed Flag WarningTFX3 days
Jul 23, 2:56 AM MDTFire Weather WatchTFX12 hr
Jul 23, 2:18 PM MDTRed Flag WarningMSO31 hr
Jul 24, 1:27 PM MDTRed Flag WarningMSO32 hr
Jul 24, 2:23 PM MDTRed Flag WarningTFX30 hr
Jul 24, 8:17 PM MDTSpecial Weather StatementMSO28 min
Jul 24, 9:28 PM MDTSevere Thunderstorm WarningMSO32 min
Aug 5, 2:35 PM MDTMesoscale DiscussionSPC115 min
Aug 6, 4:45 PM MDTSpecial Weather StatementMSO30 min
Aug 6, 5:01 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 6, 5:29 PM MDTSpecial Weather StatementMSO31 min
Aug 18, 5:06 PM MDTMesoscale DiscussionSPC2 hr
Aug 18, 6:08 PM MDTSpecial Weather StatementMSO37 min
Aug 18, 6:15 PM MDTSpecial Weather StatementMSO30 min
Aug 19, 2:21 PM MDTMesoscale DiscussionSPC84 min
Aug 19, 2:48 PM MDTSevere Thunderstorm WatchSPC7 hr
Aug 19, 3:01 PM MDTSpecial Weather StatementMSO44 min
Aug 19, 6:05 PM MDTMesoscale DiscussionSPC115 min
Aug 23, 6:39 AM MDTRed Flag WarningTFX15 hr
Aug 23, 7:04 AM MDTRed Flag WarningMSO13 hr
Aug 23, 2:13 PM MDTMesoscale DiscussionSPC2 hr
Aug 23, 2:54 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 23, 3:19 PM MDTSpecial Weather StatementMSO41 min
Aug 23, 3:54 PM MDTSpecial Weather StatementMSO51 min
Aug 23, 5:04 PM MDTMesoscale DiscussionSPC116 min
Aug 26, 10:39 AM MDTRed Flag WarningMSO34 hr
Aug 27, 9:01 AM MDTWinter Weather AdvisoryMSO47 hr
Aug 28, 12:37 PM MDTFreeze WarningMSO20 hr
Aug 31, 1:20 PM MDTFire Weather WatchMSO24 hr
Sep 1, 1:03 PM MDTRed Flag WarningMSO33 hr
Sep 3, 12:07 PM MDTMesoscale DiscussionSPC113 min
Sep 3, 2:07 PM MDTSpecial Weather StatementMSO38 min
Sep 10, 1:12 PM MDTWinter Weather AdvisoryMSO65 hr
Sep 11, 1:29 PM MDTFlood WatchMSO8 hr
Sep 11, 4:09 PM MDTSpecial Weather StatementMSO36 min
Sep 11, 4:11 PM MDTSpecial Weather StatementMSO34 min
Sep 28, 10:54 AM MDTRed Flag WarningMSO34 hr
Oct 2, 12:48 PM MDTHigh Wind WatchMSO24 hr
Oct 2, 12:49 PM MDTFire Weather WatchMSO23 hr
Oct 3, 11:31 AM MDTRed Flag WarningMSO34 hr
Oct 3, 1:00 PM MDTHigh Wind WarningMSO37 hr
Oct 16, 9:05 AM MDTWinter Weather AdvisoryMSO36 hr
Oct 18, 7:45 AM MDTDense Fog AdvisoryMSO3 hr
Nov 3, 2:29 PM MSTWinter Weather AdvisoryMSO42 hr
Nov 5, 4:50 PM MSTSpecial Weather StatementMSO40 min
Nov 15, 1:38 AM MSTWinter Weather AdvisoryMSO26 hr
Nov 15, 1:01 PM MSTWinter Weather AdvisoryMSO70 hr
Nov 23, 11:10 AM MSTWinter Weather AdvisoryMSO23 hr
Dec 6, 11:09 AM MSTWinter Weather AdvisoryMSO45 hr
Dec 13, 12:43 PM MSTWinter Weather AdvisoryMSO46 hr
Dec 15, 1:45 PM MSTWinter Weather AdvisoryMSO43 hr
Dec 17, 2:31 AM MSTHigh Wind WatchMSO8 hr
Dec 17, 10:15 AM MSTWinter Weather AdvisoryMSO25 hr
Dec 17, 10:55 AM MSTHigh Wind WarningMSO34 hr
Dec 28, 2:19 PM MSTWinter Weather AdvisoryMSO63 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 archive20232025

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.