Alert archive / Montana / Powell County

Weather alerts in Powell County, Montana, 2018

123 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts
123
Warnings
23
Watches
16
Advisories
62
Busiest month
June21 alerts
Busiest day
June 9, 20188 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, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings3233%1100%23 min
Flash flood warnings00

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: severe thunderstorm warnings11918%1776%18 min
NWS Missoula, MT: flash flood warnings10100%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 5, 12:58 PM MSTWinter Weather AdvisoryMSO22 hr
Jan 9, 3:56 AM MSTWinter Weather AdvisoryMSO37 hr
Jan 9, 2:25 PM MSTWinter Storm WatchMSO24 hr
Jan 10, 2:16 PM MSTWinter Weather AdvisoryMSO42 hr
Jan 17, 1:59 PM MSTWinter Weather AdvisoryMSO21 hr
Jan 17, 1:59 PM MSTWinter Weather AdvisoryMSO45 hr
Jan 23, 3:31 AM MSTWinter Weather AdvisoryMSO35 hr
Jan 24, 2:06 PM MSTWinter Weather AdvisoryMSO21 hr
Jan 25, 8:58 PM MSTWinter Weather AdvisoryMSO13 hr
Jan 30, 1:05 AM MSTWind AdvisoryMSO16 hr
Jan 30, 8:10 PM MSTWinter Weather AdvisoryMSO13 hr
Feb 2, 2:43 PM MSTWinter Storm WatchMSO22 hr
Feb 3, 4:09 AM MSTWinter Storm WarningMSO32 hr
Feb 3, 12:48 PM MSTWinter Weather AdvisoryMSO23 hr
Feb 4, 11:54 AM MSTWinter Weather AdvisoryMSO32 hr
Feb 7, 2:27 PM MSTWinter Weather AdvisoryMSO53 hr
Feb 11, 11:22 AM MSTWinter Weather AdvisoryMSO12 hr
Feb 13, 2:18 PM MSTWinter Weather AdvisoryMSO44 hr
Feb 15, 3:18 PM MSTWinter Storm WatchMSO44 hr
Feb 15, 3:18 PM MSTWinter Weather AdvisoryMSO50 hr
Feb 16, 2:53 PM MSTWinter Storm WarningMSO57 hr
Feb 16, 2:53 PM MSTWinter Weather AdvisoryMSO69 hr
Feb 18, 2:26 PM MSTWind Chill AdvisoryMSO23 hr
Feb 24, 6:50 PM MSTWinter Weather AdvisoryMSO44 hr
Mar 1, 3:11 AM MSTWinter Weather AdvisoryMSO48 hr
Mar 2, 8:08 AM MSTWinter Weather AdvisoryMSO14 hr
Mar 2, 2:48 PM MSTSpecial Weather StatementMSO42 min
Mar 2, 3:48 PM MSTSpecial Weather StatementMSO57 min
Mar 3, 2:05 PM MSTWinter Weather AdvisoryMSO24 hr
Mar 8, 7:26 AM MSTWinter Weather AdvisoryMSO25 hr
Mar 14, 12:54 PM MDTWinter Weather AdvisoryMSO28 hr
Mar 16, 3:17 AM MDTWinter Weather AdvisoryMSO57 hr
Mar 28, 4:46 AM MDTWinter Weather AdvisoryMSO4 hr
Mar 31, 7:21 AM MDTWinter Weather AdvisoryMSO4 hr
Apr 1, 3:49 AM MDTWinter Weather AdvisoryMSO50 hr
Apr 4, 2:39 PM MDTWinter Storm WatchMSO21 hr
Apr 4, 2:39 PM MDTWinter Weather AdvisoryMSO21 hr
Apr 5, 12:07 PM MDTWinter Storm WarningMSO24 hr
Apr 11, 12:48 PM MDTWinter Weather AdvisoryMSO29 hr
Apr 20, 1:53 PM MDTWind AdvisoryMSO31 hr
Apr 29, 2:30 PM MDTWinter Weather AdvisoryMSO20 hr
Apr 30, 1:59 PM MDTAreal Flood AdvisoryMSO43 hr
Apr 30, 5:34 PM MDTAreal Flood AdvisoryMSO4 days
May 6, 10:24 AM MDTAreal Flood WarningMSO12 days
May 7, 2:42 PM MDTAreal Flood AdvisoryMSO67 hr
May 10, 9:45 AM MDTAreal Flood WarningMSO47 hr
May 10, 11:18 AM MDTAreal Flood AdvisoryMSO46 hr
May 10, 1:35 PM MDTWinter Weather AdvisoryMSO18 hr
May 14, 1:21 PM MDTFlood WatchMSO71 hr
May 25, 6:16 PM MDTSpecial Weather StatementMSO44 min
May 26, 2:21 PM MDTMesoscale DiscussionSPC114 min
May 30, 10:35 AM MDTFlood WatchMSO47 hr
May 31, 12:33 PM MDTMesoscale DiscussionSPC117 min
May 31, 1:50 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 4, 1:47 PM MDTMesoscale DiscussionSPC118 min
Jun 4, 5:08 PM MDTSpecial Weather StatementMSO52 min
Jun 7, 4:38 PM MDTSpecial Weather StatementMSO37 min
Jun 8, 2:18 PM MDTWind AdvisoryMSO31 hr
Jun 9, 11:54 AM MDTWinter Weather AdvisoryMSO48 hr
Jun 9, 1:06 PM MDTMesoscale DiscussionSPC114 min
Jun 9, 1:20 PM MDTSpecial Weather StatementMSO40 min
Jun 9, 1:46 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 9, 2:02 PM MDTSpecial Weather StatementMSO43 min
Jun 9, 3:17 PM MDTSpecial Weather StatementMSO13 min
Jun 9, 3:27 PM MDTSevere Thunderstorm WarningMSO33 min
Jun 9, 4:53 PM MDTMesoscale DiscussionSPC97 min
Jun 11, 1:15 PM MDTFrost AdvisoryMSO19 hr
Jun 19, 8:12 AM MDTAreal Flood AdvisoryMSO13 hr
Jun 19, 9:09 PM MDTAreal Flood WarningMSO12 hr
Jun 20, 6:37 AM MDTAreal Flood WarningMSO44 hr
Jun 20, 9:11 AM MDTAreal Flood WarningMSO13 min
Jun 25, 5:02 PM MDTSpecial Weather StatementMSO13 min
Jun 25, 5:29 PM MDTMesoscale DiscussionSPC3 hr
Jun 25, 5:38 PM MDTSpecial Weather StatementMSO52 min
Jun 25, 6:31 PM MDTSpecial Weather StatementMSO14 min
Jul 20, 2:00 PM MDTRed Flag WarningTFX34 hr
Jul 20, 2:51 PM MDTFire Weather WatchMSO31 hr
Jul 26, 1:10 PM MDTMesoscale DiscussionSPC3 hr
Jul 27, 7:43 AM MDTFire Weather WatchMSO6 hr
Jul 27, 2:07 PM MDTRed Flag WarningMSO5 hr
Jul 27, 4:25 PM MDTSpecial Weather StatementMSO65 min
Jul 27, 4:39 PM MDTSevere Thunderstorm WarningMSO36 min
Jul 27, 5:22 PM MDTSevere Thunderstorm WarningMSO53 min
Jul 31, 2:49 PM MDTFire Weather WatchMSO14 hr
Aug 1, 4:19 AM MDTRed Flag WarningMSO17 hr
Aug 1, 11:03 AM MDTRed Flag WarningTFX59 hr
Aug 1, 12:04 PM MDTRed Flag WarningMSO34 hr
Aug 2, 3:36 AM MDTRed Flag WarningMSO42 hr
Aug 7, 2:46 PM MDTHeat AdvisoryMSO3 days
Aug 8, 3:25 AM MDTFire Weather WatchTFX36 hr
Aug 8, 2:13 PM MDTFire Weather WatchMSO24 hr
Aug 9, 2:23 PM MDTRed Flag WarningMSO3 days
Aug 9, 3:02 PM MDTRed Flag WarningTFX3 days
Aug 15, 2:14 PM MDTFire Weather WatchMSO32 hr
Aug 15, 2:14 PM MDTFire Weather WatchMSO24 hr
Aug 15, 2:19 PM MDTFire Weather WatchTFX25 hr
Aug 16, 2:26 PM MDTRed Flag WarningMSO37 hr
Aug 16, 3:01 PM MDTRed Flag WarningTFX33 hr
Aug 18, 3:44 PM MDTSpecial Weather StatementMSO31 min
Sep 7, 5:22 PM MDTSpecial Weather StatementMSO38 min
Sep 28, 10:11 AM MDTWind AdvisoryMSO38 hr
Sep 28, 2:26 PM MDTWinter Weather AdvisoryMSO43 hr
Oct 9, 3:48 AM MDTWinter Weather AdvisoryMSO29 hr
Oct 13, 1:31 AM MDTWinter Weather AdvisoryMSO10 hr
Nov 2, 3:38 AM MDTWind AdvisoryMSO17 hr
Nov 5, 2:53 AM MSTWinter Weather AdvisoryMSO33 hr
Nov 6, 2:18 PM MSTWinter Weather AdvisoryMSO42 hr
Nov 9, 6:06 PM MSTWinter Weather AdvisoryMSO16 hr
Nov 10, 6:05 PM MSTWinter Weather AdvisoryMSO3 hr
Nov 11, 1:49 PM MSTWinter Weather AdvisoryMSO7 hr
Nov 15, 1:38 PM MSTWinter Weather AdvisoryMSO37 hr
Nov 16, 1:12 PM MSTSpecial Weather StatementMSO48 min
Nov 21, 2:47 PM MSTWinter Weather AdvisoryMSO69 hr
Nov 22, 1:53 PM MSTWinter Storm WarningMSO46 hr
Dec 10, 2:42 PM MSTWinter Weather AdvisoryMSO50 hr
Dec 17, 7:59 AM MSTWinter Weather AdvisoryMSO2 hr
Dec 17, 2:37 PM MSTWinter Weather AdvisoryMSO44 hr
Dec 20, 2:39 PM MSTWinter Weather AdvisoryMSO20 hr
Dec 22, 3:34 AM MSTWinter Weather AdvisoryMSO64 hr
Dec 28, 2:40 PM MSTWinter Weather AdvisoryMSO24 hr
Dec 29, 2:11 PM MSTWinter Storm WarningMSO30 hr
Dec 29, 2:11 PM MSTWinter Weather AdvisoryMSO39 hr
Dec 30, 2:16 PM MSTWinter Weather AdvisoryMSO15 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 archive20172019

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.