Alert archive / Montana / Custer County

Weather alerts in Custer County, Montana, 2019

137 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Custer County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts
137
Warnings
31
Watches
19
Advisories
21
Busiest month
July48 alerts
Busiest day
July 8, 20197 alerts

Over time

By month

Warning verification

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

Custer County, 2019

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings201145%1258%43 min
Flash flood warnings3167%2100%135 min

Each office's whole area, 2019

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Billings, MT: tornado warnings30100%40%
NWS Billings, MT: severe thunderstorm warnings1858355%23373%29 min
NWS Billings, MT: flash flood warnings12467%1267%171 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 17, 12:24 AM MSTDense Fog AdvisoryBYZ6 hr
Jan 20, 2:53 PM MSTWinter Weather AdvisoryBYZ35 hr
Jan 25, 3:24 PM MSTHigh Wind WarningBYZ59 hr
Jan 26, 3:20 AM MSTHigh Wind WatchBYZ23 hr
Jan 28, 2:07 PM MSTSpecial Weather StatementBYZ3 hr
Feb 1, 4:08 AM MSTWinter Storm WatchBYZ24 hr
Feb 2, 3:45 AM MSTWinter Weather AdvisoryBYZ41 hr
Feb 3, 11:46 AM MSTWind Chill AdvisoryBYZ5 days
Feb 8, 12:07 PM MSTWind Chill AdvisoryBYZ48 hr
Feb 10, 11:52 AM MSTWind Chill AdvisoryBYZ21 hr
Feb 14, 2:40 PM MSTWinter Weather AdvisoryBYZ25 hr
Feb 15, 3:32 PM MSTWinter Storm WatchBYZ12 hr
Feb 15, 8:53 PM MSTWinter Storm WarningBYZ38 hr
Feb 23, 3:00 AM MSTWinter Weather AdvisoryBYZ6 days
Feb 23, 3:12 PM MSTWind Chill AdvisoryBYZ20 hr
Feb 24, 2:57 AM MSTWinter Weather AdvisoryBYZ60 hr
Feb 26, 2:30 PM MSTWind Chill AdvisoryBYZ20 hr
Mar 1, 1:14 PM MSTWind Chill AdvisoryBYZ70 hr
Mar 1, 6:41 PM MSTSpecial Weather StatementBYZ79 min
Mar 2, 3:10 PM MSTWind Chill WarningBYZ44 hr
Mar 4, 2:59 PM MSTWind Chill AdvisoryBYZ19 hr
Mar 7, 3:28 AM MSTWinter Storm WatchBYZ23 hr
Mar 8, 2:55 AM MSTWinter Weather AdvisoryBYZ31 hr
Mar 12, 3:44 PM MDTWinter Weather AdvisoryBYZ35 hr
Mar 20, 8:42 AM MDTAreal Flood WarningBYZ7 hr
Mar 20, 5:33 PM MDTAreal Flood WarningBYZ17 hr
Apr 6, 6:42 AM MDTSpecial Weather StatementBYZ108 min
May 13, 6:42 PM MDTSpecial Weather StatementBYZ33 min
May 13, 7:18 PM MDTSpecial Weather StatementBYZ42 min
May 13, 8:04 PM MDTSpecial Weather StatementBYZ26 min
May 20, 2:43 PM MDTFlood WatchBYZ48 hr
May 26, 7:57 PM MDTSpecial Weather StatementBYZ63 min
May 28, 2:53 PM MDTRiver Flood WatchBYZ4 days
May 30, 3:44 PM MDTAreal Flood WarningBYZ44 hr
Jun 14, 12:21 PM MDTMesoscale DiscussionSPC114 min
Jun 14, 4:49 PM MDTSpecial Weather StatementBYZ41 min
Jun 14, 5:36 PM MDTSpecial Weather StatementBYZ39 min
Jun 18, 6:03 PM MDTSpecial Weather StatementBYZ57 min
Jun 18, 7:00 PM MDTSpecial Weather StatementBYZ45 min
Jun 19, 6:23 PM MDTSpecial Weather StatementBYZ22 min
Jun 19, 6:50 PM MDTSpecial Weather StatementBYZ25 min
Jun 19, 7:14 PM MDTSpecial Weather StatementBYZ46 min
Jun 20, 3:27 PM MDTMesoscale DiscussionSPC63 min
Jun 20, 4:38 PM MDTSevere Thunderstorm WatchSPC4 hr
Jun 20, 8:43 PM MDTMesoscale DiscussionSPC32 min
Jun 26, 2:16 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 26, 6:03 PM MDTMesoscale DiscussionSPC57 min
Jun 26, 6:42 PM MDTSevere Thunderstorm WarningBYZ63 min
Jun 26, 7:35 PM MDTFlash Flood WarningBYZ4 hr
Jun 30, 4:34 PM MDTMesoscale DiscussionSPC86 min
Jul 1, 4:40 PM MDTMesoscale DiscussionSPC95 min
Jul 1, 6:18 PM MDTSevere Thunderstorm WatchSPC6 hr
Jul 2, 1:33 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 5, 9:27 AM MDTFlash Flood WatchBYZ14 hr
Jul 5, 11:46 AM MDTSpecial Weather StatementBYZ44 min
Jul 5, 12:53 PM MDTFlash Flood WarningBYZ9 hr
Jul 7, 2:58 PM MDTSevere Thunderstorm WatchSPC9 hr
Jul 7, 6:45 PM MDTSpecial Weather StatementBYZ45 min
Jul 7, 6:51 PM MDTSevere Thunderstorm WarningBYZ54 min
Jul 7, 7:43 PM MDTSevere Thunderstorm WarningBYZ44 min
Jul 8, 3:21 AM MDTFlash Flood WatchBYZ24 hr
Jul 8, 12:53 PM MDTMesoscale DiscussionSPC2 hr
Jul 8, 1:25 PM MDTSevere Thunderstorm WatchSPC10 hr
Jul 8, 5:24 PM MDTMesoscale DiscussionSPC2 hr
Jul 8, 7:13 PM MDTSevere Thunderstorm WarningBYZ62 min
Jul 8, 7:37 PM MDTSevere Thunderstorm WarningBYZ38 min
Jul 8, 8:02 PM MDTMesoscale DiscussionSPC88 min
Jul 8, 8:14 PM MDTSevere Thunderstorm WarningBYZ61 min
Jul 8, 8:16 PM MDTSpecial Weather StatementBYZ44 min
Jul 8, 8:21 PM MDTSevere Thunderstorm WarningBYZ38 min
Jul 13, 12:45 AM MDTSpecial Weather StatementBYZ45 min
Jul 13, 1:28 AM MDTSpecial Weather StatementBYZ47 min
Jul 13, 4:10 PM MDTMesoscale DiscussionSPC2 hr
Jul 13, 8:21 PM MDTSevere Thunderstorm WarningBYZ39 min
Jul 13, 8:58 PM MDTSevere Thunderstorm WarningBYZ37 min
Jul 13, 9:21 PM MDTSpecial Weather StatementBYZ39 min
Jul 13, 9:58 PM MDTSpecial Weather StatementBYZ47 min
Jul 14, 6:15 PM MDTMesoscale DiscussionSPC2 hr
Jul 14, 8:40 PM MDTSpecial Weather StatementBYZ50 min
Jul 14, 9:33 PM MDTSevere Thunderstorm WarningBYZ57 min
Jul 14, 10:27 PM MDTSevere Thunderstorm WarningBYZ43 min
Jul 16, 12:56 PM MDTMesoscale DiscussionSPC94 min
Jul 16, 1:28 PM MDTSevere Thunderstorm WatchSPC8 hr
Jul 16, 6:29 PM MDTMesoscale DiscussionSPC91 min
Jul 17, 8:19 PM MDTSpecial Weather StatementBYZ41 min
Jul 24, 3:51 PM MDTMesoscale DiscussionSPC2 hr
Jul 27, 4:28 PM MDTSpecial Weather StatementBYZ47 min
Jul 27, 4:42 PM MDTFlash Flood WarningBYZ3 hr
Jul 27, 5:46 PM MDTSpecial Weather StatementBYZ59 min
Jul 27, 6:44 PM MDTSpecial Weather StatementBYZ46 min
Jul 30, 2:55 PM MDTMesoscale DiscussionSPC2 hr
Jul 30, 4:52 PM MDTMesoscale DiscussionSPC83 min
Jul 30, 5:08 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 30, 7:29 PM MDTMesoscale DiscussionSPC91 min
Jul 30, 7:34 PM MDTSevere Thunderstorm WarningBYZ56 min
Jul 30, 7:42 PM MDTSevere Thunderstorm WarningBYZ63 min
Jul 30, 8:39 PM MDTSevere Thunderstorm WarningBYZ36 min
Jul 30, 10:30 PM MDTSpecial Weather StatementBYZ45 min
Aug 4, 4:11 AM MDTSpecial Weather StatementBYZ49 min
Aug 4, 4:50 AM MDTSevere Thunderstorm WarningBYZ40 min
Aug 5, 12:10 AM MDTSpecial Weather StatementBYZ50 min
Aug 10, 4:53 PM MDTMesoscale DiscussionSPC2 hr
Aug 10, 8:34 PM MDTMesoscale DiscussionSPC86 min
Aug 11, 12:15 PM MDTMesoscale DiscussionSPC90 min
Aug 11, 1:59 PM MDTTornado WatchSPC10 hr
Aug 11, 5:54 PM MDTMesoscale DiscussionSPC66 min
Aug 11, 8:45 PM MDTMesoscale DiscussionSPC60 min
Aug 11, 8:53 PM MDTSevere Thunderstorm WarningBYZ52 min
Aug 11, 9:40 PM MDTSevere Thunderstorm WarningBYZ65 min
Aug 18, 7:45 AM MDTSpecial Weather StatementBYZ75 min
Aug 22, 5:28 PM MDTMesoscale DiscussionSPC2 hr
Aug 22, 7:53 PM MDTSevere Thunderstorm WarningBYZ67 min
Aug 25, 8:13 PM MDTSpecial Weather StatementBYZ47 min
Sep 1, 3:06 PM MDTSpecial Weather StatementBYZ39 min
Sep 1, 3:25 PM MDTSevere Thunderstorm WarningBYZ50 min
Sep 1, 4:09 PM MDTMesoscale DiscussionSPC2 hr
Sep 1, 4:14 PM MDTSevere Thunderstorm WarningBYZ61 min
Sep 17, 4:11 PM MDTSpecial Weather StatementBYZ49 min
Sep 17, 4:58 PM MDTSpecial Weather StatementBYZ47 min
Oct 1, 9:10 AM MDTWinter Weather AdvisoryBYZ36 hr
Oct 3, 4:56 AM MDTDense Fog AdvisoryBYZ4 hr
Oct 6, 1:56 PM MDTWinter Storm WatchBYZ49 hr
Oct 8, 4:02 AM MDTWinter Storm WarningBYZ47 hr
Oct 22, 6:12 PM MDTSpecial Weather StatementBYZ48 min
Oct 22, 6:59 PM MDTSpecial Weather StatementBYZ46 min
Nov 5, 3:10 AM MSTWinter Weather AdvisoryBYZ32 hr
Nov 8, 2:39 PM MSTWinter Weather AdvisoryBYZ54 hr
Nov 10, 1:51 PM MSTSpecial Weather StatementBYZ84 min
Nov 14, 1:02 AM MSTDense Fog AdvisoryBYZ9 hr
Nov 20, 8:49 AM MSTSpecial Weather StatementBYZ116 min
Nov 26, 9:45 AM MSTWinter Storm WatchBYZ25 hr
Nov 27, 8:00 AM MSTSpecial Weather StatementBYZ2 hr
Nov 27, 10:22 AM MSTWinter Storm WarningBYZ3 days
Nov 29, 8:04 AM MSTSpecial Weather StatementBYZ4 hr
Dec 7, 3:14 AM MSTWinter Weather AdvisoryBYZ41 hr
Dec 12, 7:38 AM MSTSpecial Weather StatementBYZ3 hr
Dec 24, 11:28 PM MSTSpecial Weather StatementBYZ2 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 archive20182020

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.