Alert archive / Montana / Powell County

Weather alerts in Powell County, Montana, 2023

109 weather alerts in 2023, 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 2023. Tap one for its archive.

Alerts
109
Warnings
11
Watches
12
Advisories
59
Busiest month
January14 alerts
Busiest day
June 8, 20234 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, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings2150%1100%4 min
Flash flood warnings00

Each office's whole area, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: tornado warnings010%
NWS Missoula, MT: severe thunderstorm warnings13377%2520%10 min
NWS Missoula, MT: flash flood warnings7271%4100%29 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
Jan 7, 9:01 AM MSTDense Fog AdvisoryMSO3 hr
Jan 9, 1:10 PM MSTWinter Weather AdvisoryMSO13 hr
Jan 13, 12:11 PM MSTWinter Weather AdvisoryMSO23 hr
Jan 14, 5:46 AM MSTWinter Storm WarningMSO5 hr
Jan 15, 10:02 AM MSTWinter Weather AdvisoryMSO24 hr
Jan 16, 11:05 AM MSTWinter Weather AdvisoryMSO23 hr
Jan 20, 1:43 PM MSTWinter Weather AdvisoryMSO42 hr
Jan 25, 11:39 AM MSTWinter Storm WatchMSO24 min
Jan 25, 11:46 AM MSTWinter Storm WatchMSO26 hr
Jan 26, 1:59 PM MSTWinter Storm WarningMSO47 hr
Jan 26, 1:59 PM MSTWinter Weather AdvisoryMSO51 hr
Jan 28, 10:57 AM MSTWinter Weather AdvisoryMSO6 hr
Jan 28, 1:48 PM MSTWind Chill AdvisoryMSO20 hr
Jan 31, 7:09 AM MSTWinter Weather AdvisoryMSO28 hr
Feb 7, 1:19 AM MSTWinter Weather AdvisoryMSO34 hr
Feb 12, 12:24 PM MSTWinter Weather AdvisoryMSO60 hr
Feb 18, 2:41 AM MSTWinter Weather AdvisoryMSO16 hr
Feb 18, 2:25 PM MSTWinter Storm WatchMSO72 hr
Feb 18, 2:25 PM MSTWinter Weather AdvisoryMSO4 days
Feb 19, 2:02 PM MSTWinter Storm WarningMSO61 hr
Feb 20, 2:51 PM MSTWinter Weather AdvisoryMSO20 hr
Feb 21, 2:20 PM MSTWind Chill WarningMSO24 hr
Feb 21, 9:00 PM MSTWind Chill AdvisoryMSO39 hr
Feb 23, 3:15 AM MSTWind Chill WarningMSO9 hr
Feb 23, 3:15 AM MSTWind Chill AdvisoryMSO4 hr
Feb 23, 12:07 PM MSTWind Chill AdvisoryMSO20 hr
Feb 26, 6:39 PM MSTWinter Weather AdvisoryMSO9 hr
Mar 1, 3:54 AM MSTWinter Weather AdvisoryMSO64 hr
Mar 2, 9:08 PM MSTSpecial Weather StatementMSO52 min
Mar 2, 10:17 PM MSTSpecial Weather StatementMSO58 min
Mar 4, 3:22 AM MSTWinter Weather AdvisoryMSO36 hr
Mar 6, 10:33 AM MSTWinter Weather AdvisoryMSO14 hr
Mar 9, 12:07 PM MSTWinter Weather AdvisoryMSO47 hr
Mar 13, 3:12 AM MDTWinter Weather AdvisoryMSO30 hr
Mar 14, 11:54 AM MDTWinter Weather AdvisoryMSO26 hr
Mar 19, 2:40 PM MDTWinter Weather AdvisoryMSO42 hr
Mar 25, 3:15 AM MDTWinter Weather AdvisoryMSO45 hr
Mar 28, 1:21 PM MDTWinter Weather AdvisoryMSO59 hr
Mar 31, 1:05 PM MDTWinter Weather AdvisoryMSO44 hr
Apr 9, 2:34 PM MDTWind AdvisoryMSO52 hr
Apr 11, 2:32 PM MDTWinter Weather AdvisoryMSO45 hr
Apr 17, 1:49 PM MDTWinter Weather AdvisoryMSO23 hr
Apr 18, 8:32 PM MDTWinter Weather AdvisoryMSO9 hr
Apr 20, 2:01 PM MDTWinter Weather AdvisoryMSO22 hr
Apr 23, 2:32 PM MDTWinter Weather AdvisoryMSO39 hr
May 17, 12:11 AM MDTSpecial Weather StatementMSO64 min
May 22, 11:36 AM MDTMesoscale DiscussionSPC2 hr
May 22, 12:01 PM MDTSpecial Weather StatementMSO44 min
May 22, 12:06 PM MDTSevere Thunderstorm WarningMSO24 min
May 31, 1:55 PM MDTFlood WatchMSO4 hr
Jun 7, 10:50 AM MDTFlood WatchMSO12 hr
Jun 8, 3:02 AM MDTFlood WatchMSO18 hr
Jun 8, 12:13 PM MDTAreal Flood AdvisoryMSO6 hr
Jun 8, 1:11 PM MDTAreal Flood AdvisoryMSO4 hr
Jun 8, 3:16 PM MDTAreal Flood AdvisoryMSO3 hr
Jun 10, 4:45 PM MDTSpecial Weather StatementMSO30 min
Jun 11, 7:35 PM MDTSpecial Weather StatementTFX25 min
Jun 12, 5:48 PM MDTSpecial Weather StatementMSO42 min
Jun 27, 1:17 PM MDTSpecial Weather StatementMSO28 min
Jul 1, 11:34 AM MDTSpecial Weather StatementMSO41 min
Jul 6, 3:53 PM MDTSpecial Weather StatementMSO52 min
Jul 10, 2:07 PM MDTMesoscale DiscussionSPC2 hr
Jul 11, 12:58 AM MDTSpecial Weather StatementMSO32 min
Jul 22, 1:24 PM MDTFire Weather WatchMSO25 hr
Jul 23, 2:06 PM MDTRed Flag WarningMSO34 hr
Jul 27, 4:19 PM MDTSevere Thunderstorm WarningMSO16 min
Jul 27, 4:37 PM MDTSpecial Weather StatementMSO38 min
Jul 27, 5:35 PM MDTSpecial Weather StatementMSO40 min
Jul 28, 4:29 PM MDTSpecial Weather StatementMSO31 min
Jul 28, 5:46 PM MDTSpecial Weather StatementMSO29 min
Jul 28, 6:16 PM MDTSpecial Weather StatementMSO29 min
Jul 28, 9:45 PM MDTSpecial Weather StatementMSO30 min
Aug 14, 12:27 PM MDTFire Weather WatchMSO24 hr
Aug 14, 12:27 PM MDTFire Weather WatchMSO3 days
Aug 15, 12:26 PM MDTRed Flag WarningMSO3 days
Aug 16, 1:25 PM MDTFire Weather WatchMSO19 hr
Aug 17, 11:53 AM MDTRed Flag WarningTFX33 hr
Aug 20, 12:20 PM MDTWind AdvisoryMSO34 hr
Aug 22, 1:50 PM MDTSpecial Weather StatementMSO40 min
Aug 22, 3:07 PM MDTSpecial Weather StatementMSO38 min
Aug 22, 9:13 PM MDTSpecial Weather StatementMSO32 min
Aug 25, 5:05 PM MDTSpecial Weather StatementMSO25 min
Aug 29, 2:54 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 29, 4:53 PM MDTSpecial Weather StatementMSO37 min
Aug 29, 7:16 PM MDTMesoscale DiscussionSPC89 min
Sep 8, 3:43 AM MDTSpecial Weather StatementMSO32 min
Sep 8, 5:31 PM MDTSpecial Weather StatementMSO29 min
Sep 20, 11:32 AM MDTWind AdvisoryMSO22 hr
Sep 20, 1:52 PM MDTWinter Weather AdvisoryMSO46 hr
Oct 16, 1:25 PM MDTWind AdvisoryMSO29 hr
Oct 22, 1:25 PM MDTWinter Storm WatchMSO24 hr
Oct 23, 1:40 PM MDTWinter Storm WarningMSO46 hr
Oct 23, 1:40 PM MDTWinter Weather AdvisoryMSO4 days
Oct 30, 10:10 AM MDTAir Stagnation AdvisoryMSO62 hr
Nov 1, 10:37 AM MDTWinter Weather AdvisoryMSO25 hr
Nov 10, 8:48 AM MSTWind AdvisoryMSO38 hr
Nov 13, 1:15 PM MSTWinter Weather AdvisoryMSO68 hr
Nov 19, 7:08 AM MSTWinter Weather AdvisoryMSO3 hr
Nov 21, 11:38 AM MSTWinter Weather AdvisoryMSO53 hr
Nov 22, 6:48 AM MSTWinter Weather AdvisoryMSO2 hr
Nov 27, 11:48 AM MSTAir Stagnation AdvisoryMSO70 hr
Nov 30, 10:44 AM MSTWinter Weather AdvisoryMSO63 hr
Dec 2, 1:09 PM MSTWinter Weather AdvisoryMSO44 hr
Dec 6, 2:35 AM MSTWinter Weather AdvisoryMSO66 hr
Dec 8, 2:05 PM MSTWinter Weather AdvisoryMSO63 hr
Dec 10, 1:29 PM MSTWinter Weather AdvisoryMSO22 hr
Dec 14, 10:53 AM MSTAir Stagnation AdvisoryMSO5 days
Dec 22, 6:49 AM MSTDense Fog AdvisoryMSO5 hr
Dec 22, 11:43 AM MSTWinter Weather AdvisoryMSO23 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 archive20222024

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.