Alert archive / Montana / Powell County

Weather alerts in Powell County, Montana, 2013

127 weather alerts in 2013, 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 2013. Tap one for its archive.

Alerts
127
Warnings
30
Watches
16
Advisories
43
Busiest month
August23 alerts
Busiest day
September 6, 20139 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, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings8538%5100%21 min
Flash flood warnings00

Each office's whole area, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Missoula, MT: tornado warnings010%
NWS Missoula, MT: severe thunderstorm warnings351654%5159%17 min
NWS Missoula, MT: flash flood warnings80100%40%

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 6, 1:59 PM MSTWinter Weather AdvisoryMSO39 hr
Jan 9, 9:01 AM MSTWinter Storm WatchMSO4 hr
Jan 9, 11:43 AM MSTWinter Weather AdvisoryMSO49 hr
Jan 9, 12:53 PM MSTWinter Storm WarningMSO44 hr
Jan 13, 2:57 PM MSTWinter Weather AdvisoryMSO29 hr
Jan 17, 7:25 AM MSTDense Fog AdvisoryMSO4 hr
Jan 17, 2:08 PM MSTDense Fog AdvisoryMSO22 hr
Jan 22, 7:10 AM MSTDense Fog AdvisoryMSO5 hr
Jan 23, 7:21 PM MSTWinter Weather AdvisoryMSO14 hr
Jan 25, 2:17 PM MSTWinter Weather AdvisoryMSO45 hr
Jan 28, 3:25 AM MSTWinter Weather AdvisoryMSO62 hr
Feb 9, 1:19 PM MSTWinter Weather AdvisoryMSO22 hr
Feb 15, 12:21 PM MSTWinter Weather AdvisoryMSO63 hr
Feb 22, 4:10 AM MSTWinter Weather AdvisoryMSO40 hr
Mar 1, 11:06 AM MSTWinter Weather AdvisoryMSO46 hr
Mar 15, 2:15 PM MDTWinter Weather AdvisoryMSO4 days
Mar 19, 2:08 PM MDTWinter Weather AdvisoryMSO34 hr
Mar 20, 6:18 PM MDTSpecial Weather StatementMSO57 min
Mar 20, 7:00 PM MDTSpecial Weather StatementMSO60 min
Mar 22, 8:41 PM MDTWinter Weather AdvisoryMSO15 hr
Apr 6, 2:06 PM MDTWinter Weather AdvisoryMSO46 hr
Apr 12, 10:18 AM MDTWind AdvisoryMSO35 hr
Apr 16, 8:37 PM MDTWinter Weather AdvisoryMSO3 hr
Apr 20, 3:31 AM MDTWinter Weather AdvisoryMSO53 hr
Apr 25, 1:14 PM MDTWind AdvisoryMSO56 hr
Apr 28, 10:21 AM MDTHigh Wind WarningMSO35 hr
May 13, 8:08 AM MDTWind AdvisoryMSO13 hr
May 13, 1:07 PM MDTMesoscale DiscussionSPC2 hr
May 13, 2:57 PM MDTSevere Thunderstorm WatchSPC7 hr
May 13, 6:18 PM MDTMesoscale DiscussionSPC87 min
May 13, 8:09 PM MDTSpecial Weather StatementMSO51 min
May 22, 12:30 PM MDTWinter Weather AdvisoryMSO21 hr
May 23, 9:43 AM MDTWinter Storm WarningMSO19 hr
May 23, 11:56 AM MDTWinter Weather AdvisoryMSO16 hr
Jun 12, 2:31 PM MDTSevere Thunderstorm WarningMSO29 min
Jun 12, 3:43 PM MDTSpecial Weather StatementMSO17 min
Jun 12, 11:31 PM MDTSpecial Weather StatementMSO44 min
Jun 12, 11:44 PM MDTSevere Thunderstorm WarningMSO31 min
Jun 18, 1:55 PM MDTMesoscale DiscussionSPC2 hr
Jun 18, 2:37 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 18, 2:41 PM MDTSpecial Weather StatementMSO34 min
Jun 18, 5:20 PM MDTMesoscale DiscussionSPC85 min
Jun 18, 8:21 PM MDTMesoscale DiscussionSPC54 min
Jun 19, 1:21 PM MDTMesoscale DiscussionSPC114 min
Jun 19, 2:55 PM MDTSpecial Weather StatementMSO50 min
Jun 28, 1:26 PM MDTHeat AdvisoryMSO4 days
Jun 29, 1:34 PM MDTMesoscale DiscussionSPC2 hr
Jun 29, 8:25 PM MDTSpecial Weather StatementMSO50 min
Jul 8, 7:14 AM MDTSpecial Weather StatementMSO46 min
Jul 8, 12:05 PM MDTMesoscale DiscussionSPC85 min
Jul 8, 1:56 PM MDTMesoscale DiscussionSPC94 min
Jul 12, 2:32 PM MDTMesoscale DiscussionSPC118 min
Jul 17, 2:22 PM MDTMesoscale DiscussionSPC83 min
Jul 17, 2:48 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 17, 2:53 PM MDTSpecial Weather StatementMSO52 min
Jul 17, 3:32 PM MDTSevere Thunderstorm WarningMSO43 min
Jul 17, 3:42 PM MDTSevere Thunderstorm WarningMSO63 min
Jul 17, 4:12 PM MDTSevere Thunderstorm WarningMSO33 min
Jul 25, 1:53 PM MDTFire Weather WatchMSO21 hr
Jul 26, 11:08 AM MDTRed Flag WarningMSO34 hr
Jul 27, 5:23 AM MDTRed Flag WarningTFX16 hr
Aug 1, 12:54 PM MDTMesoscale DiscussionSPC96 min
Aug 1, 1:26 PM MDTSevere Thunderstorm WatchSPC10 hr
Aug 8, 1:11 PM MDTRed Flag WarningMSO33 hr
Aug 9, 7:55 PM MDTSevere Thunderstorm WarningMSO50 min
Aug 10, 3:27 AM MDTRed Flag WarningMSO18 hr
Aug 11, 3:24 AM MDTRed Flag WarningMSO18 hr
Aug 11, 1:30 PM MDTSpecial Weather StatementMSO60 min
Aug 11, 6:16 PM MDTSpecial Weather StatementMSO44 min
Aug 12, 3:51 AM MDTRed Flag WarningMSO16 hr
Aug 12, 6:51 PM MDTSevere Thunderstorm WarningMSO39 min
Aug 12, 7:17 PM MDTSpecial Weather StatementMSO28 min
Aug 15, 12:31 PM MDTRed Flag WarningMSO32 hr
Aug 17, 2:20 PM MDTMesoscale DiscussionSPC2 hr
Aug 19, 3:19 AM MDTRed Flag WarningMSO18 hr
Aug 19, 3:36 AM MDTRed Flag WarningTFX17 hr
Aug 21, 2:48 PM MDTFire Weather WatchMSO19 hr
Aug 22, 5:07 AM MDTRed Flag WarningMSO33 hr
Aug 24, 12:03 PM MDTFire Weather WatchMSO20 hr
Aug 25, 7:41 AM MDTRed Flag WarningMSO13 hr
Aug 25, 3:36 PM MDTSpecial Weather StatementMSO39 min
Aug 26, 6:39 PM MDTSpecial Weather StatementMSO51 min
Aug 29, 2:05 PM MDTRed Flag WarningMSO31 hr
Aug 29, 2:34 PM MDTMesoscale DiscussionSPC56 min
Sep 5, 1:14 PM MDTAreal Flood AdvisoryMSO3 hr
Sep 5, 1:45 PM MDTAreal Flood AdvisoryMSO2 hr
Sep 5, 7:05 PM MDTSevere Thunderstorm WatchSPC7 hr
Sep 5, 7:31 PM MDTSevere Thunderstorm WarningMSO44 min
Sep 5, 8:13 PM MDTMesoscale DiscussionSPC2 hr
Sep 5, 8:14 PM MDTSpecial Weather StatementMSO46 min
Sep 5, 10:44 PM MDTMesoscale DiscussionSPC2 hr
Sep 6, 1:44 PM MDTMesoscale DiscussionSPC61 min
Sep 6, 2:09 PM MDTSevere Thunderstorm WatchSPC8 hr
Sep 6, 2:18 PM MDTSpecial Weather StatementMSO42 min
Sep 6, 2:35 PM MDTSpecial Weather StatementMSO40 min
Sep 7, 5:22 PM MDTMesoscale DiscussionSPC113 min
Sep 7, 6:04 PM MDTSpecial Weather StatementMSO41 min
Sep 7, 6:30 PM MDTSpecial Weather StatementMSO45 min
Sep 23, 12:05 PM MDTWinter Storm WatchMSO24 hr
Sep 24, 11:50 AM MDTWinter Storm WarningMSO48 hr
Sep 27, 2:19 PM MDTHigh Wind WatchMSO24 hr
Sep 28, 2:27 PM MDTHigh Wind WarningMSO21 hr
Sep 28, 2:27 PM MDTWind AdvisoryMSO21 hr
Sep 29, 1:54 PM MDTWinter Weather AdvisoryMSO21 hr
Oct 2, 10:59 AM MDTWinter Weather AdvisoryMSO33 hr
Oct 25, 12:34 PM MDTWinter Storm WatchMSO40 hr
Oct 26, 1:54 PM MDTWinter Storm WarningMSO67 hr
Oct 27, 4:07 AM MDTWinter Weather AdvisoryMSO38 hr
Oct 28, 11:54 AM MDTWind Chill AdvisoryMSO21 hr
Nov 2, 3:18 AM MDTWinter Weather AdvisoryMSO57 hr
Nov 5, 10:55 PM MSTWinter Weather AdvisoryMSO11 hr
Nov 6, 12:55 PM MSTWinter Weather AdvisoryMSO45 hr
Nov 7, 9:10 PM MSTHigh Wind WarningMSO61 min
Nov 9, 3:46 AM MSTWinter Weather AdvisoryMSO53 hr
Nov 13, 2:23 PM MSTWinter Storm WatchMSO45 hr
Nov 14, 3:09 PM MSTWinter Weather AdvisoryMSO4 days
Nov 29, 2:38 PM MSTWinter Storm WatchMSO48 hr
Nov 30, 3:03 PM MSTWinter Storm WarningMSO68 hr
Dec 3, 11:13 AM MSTWind Chill AdvisoryMSO24 hr
Dec 4, 2:12 PM MSTWind Chill WatchMSO14 hr
Dec 5, 4:35 AM MSTWind Chill WarningMSO60 hr
Dec 8, 1:58 PM MSTWinter Weather AdvisoryMSO51 hr
Dec 17, 12:24 PM MSTWinter Weather AdvisoryMSO47 hr
Dec 19, 10:59 AM MSTWinter Storm WarningMSO48 hr
Dec 19, 10:59 AM MSTWinter Weather AdvisoryMSO48 hr
Dec 22, 1:59 PM MSTWinter Weather AdvisoryMSO39 hr
Dec 30, 1:51 PM MSTWinter Weather AdvisoryMSO33 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 archive20122014

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.