Alert archive / Montana / Custer County

Weather alerts in Custer County, Montana, 2010

146 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts
146
Warnings
34
Watches
26
Advisories
28
Busiest month
July39 alerts
Busiest day
July 19, 201010 alerts

Over time

By month

Warning verification

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

0 of 3 tornado warnings covering Custer County in 2010 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.

Custer County, 2010

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings30100%10%
Severe thunderstorm warnings20670%1040%14 min
Flash flood warnings10100%0

Each office's whole area, 2010

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Billings, MT: tornado warnings31874%1644%16 min
NWS Billings, MT: severe thunderstorm warnings1686860%20067%22 min
NWS Billings, MT: flash flood warnings17382%850%73 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 2, 3:20 AM MSTWinter Weather AdvisoryBYZ8 hr
Jan 4, 3:33 AM MSTWinter Storm WatchBYZ13 hr
Jan 4, 4:05 PM MSTWinter Weather AdvisoryBYZ53 hr
Jan 21, 3:40 AM MSTWinter Storm WatchBYZ48 hr
Jan 21, 3:09 PM MSTWinter Storm WarningBYZ4 days
Jan 22, 8:18 AM MSTWinter Weather AdvisoryBYZ7 hr
Feb 4, 2:51 AM MSTWinter Weather AdvisoryBYZ31 hr
Feb 7, 3:13 AM MSTWind Chill AdvisoryBYZ31 hr
Feb 7, 7:26 AM MSTWinter Weather AdvisoryBYZ5 hr
Feb 12, 3:41 AM MSTWinter Weather AdvisoryBYZ44 hr
Feb 22, 12:21 AM MSTDense Fog AdvisoryBYZ9 hr
Mar 1, 3:13 PM MSTDense Fog AdvisoryBYZ20 hr
Mar 2, 3:44 PM MSTDense Fog AdvisoryBYZ19 hr
Mar 3, 2:58 PM MSTDense Fog AdvisoryBYZ18 hr
Mar 7, 3:29 AM MSTDense Fog AdvisoryBYZ6 hr
Mar 7, 6:50 PM MSTDense Fog AdvisoryBYZ18 hr
Mar 8, 2:45 PM MSTDense Fog AdvisoryBYZ15 hr
Mar 9, 3:01 PM MSTWinter Weather AdvisoryBYZ36 hr
Mar 31, 4:03 AM MDTWinter Storm WatchBYZ24 hr
Mar 31, 4:05 PM MDTWinter Weather AdvisoryBYZ41 hr
Apr 8, 2:52 PM MDTHigh Wind WarningBYZ12 hr
Apr 30, 8:03 AM MDTHigh Wind WarningBYZ18 hr
May 1, 3:37 PM MDTHigh Wind WatchBYZ47 hr
May 3, 4:12 AM MDTHigh Wind WarningBYZ41 hr
May 5, 3:28 PM MDTWinter Weather AdvisoryBYZ36 hr
May 20, 1:21 PM MDTMesoscale DiscussionSPC54 min
May 24, 3:42 PM MDTHigh Wind WarningBYZ19 hr
May 25, 11:29 AM MDTAreal Flood WarningBYZ24 hr
May 26, 11:43 AM MDTFlash Flood WatchBYZ12 hr
May 26, 3:41 PM MDTMesoscale DiscussionSPC94 min
May 26, 5:03 PM MDTTornado WatchSPC7 hr
May 26, 7:34 PM MDTFlash Flood WarningBYZ2 hr
May 26, 7:56 PM MDTTornado WarningBYZ19 min
May 26, 8:08 PM MDTSpecial Weather StatementBYZ52 min
May 26, 8:30 PM MDTMesoscale DiscussionSPC60 min
May 26, 9:21 PM MDTSpecial Weather StatementBYZ54 min
May 27, 2:54 PM MDTMesoscale DiscussionSPC96 min
May 27, 4:39 PM MDTTornado WatchSPC8 hr
May 27, 6:57 PM MDTMesoscale DiscussionSPC2 hr
May 28, 7:36 PM MDTMesoscale DiscussionSPC84 min
May 28, 9:44 PM MDTSevere Thunderstorm WatchSPC7 hr
May 28, 9:45 PM MDTSevere Thunderstorm WarningBYZ60 min
May 28, 9:46 PM MDTSevere Thunderstorm WarningBYZ44 min
May 29, 1:05 AM MDTMesoscale DiscussionSPC85 min
Jun 16, 3:18 AM MDTFlash Flood WatchBYZ32 hr
Jun 16, 3:52 AM MDTHigh Wind WatchBYZ11 hr
Jun 16, 2:31 PM MDTMesoscale DiscussionSPC89 min
Jun 16, 2:57 PM MDTHigh Wind WarningBYZ43 hr
Jun 16, 3:30 PM MDTTornado WatchSPC8 hr
Jun 16, 5:55 PM MDTSpecial Weather StatementBYZ50 min
Jun 16, 6:01 PM MDTMesoscale DiscussionSPC59 min
Jun 16, 6:10 PM MDTSevere Thunderstorm WarningBYZ50 min
Jun 16, 6:40 PM MDTSevere Thunderstorm WarningBYZ40 min
Jun 20, 12:55 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 20, 4:23 PM MDTMesoscale DiscussionSPC67 min
Jun 21, 4:07 AM MDTFlash Flood WatchBYZ19 hr
Jun 21, 1:36 PM MDTMesoscale DiscussionSPC114 min
Jun 21, 2:08 PM MDTTornado WatchSPC7 hr
Jun 21, 5:49 PM MDTSevere Thunderstorm WarningBYZ56 min
Jun 21, 6:42 PM MDTMesoscale DiscussionSPC93 min
Jun 21, 7:20 PM MDTSevere Thunderstorm WarningBYZ55 min
Jun 21, 7:58 PM MDTTornado WarningBYZ32 min
Jun 21, 8:28 PM MDTTornado WarningBYZ22 min
Jun 24, 5:25 PM MDTMesoscale DiscussionSPC95 min
Jun 29, 6:00 PM MDTMesoscale DiscussionSPC90 min
Jun 29, 10:01 PM MDTSpecial Weather StatementBYZ59 min
Jun 29, 11:11 PM MDTSpecial Weather StatementBYZ64 min
Jun 30, 3:54 PM MDTMesoscale DiscussionSPC66 min
Jun 30, 4:13 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 30, 7:13 PM MDTSpecial Weather StatementBYZ62 min
Jun 30, 7:33 PM MDTSevere Thunderstorm WarningBYZ57 min
Jul 1, 1:37 PM MDTSevere Thunderstorm WatchSPC8 hr
Jul 1, 4:57 PM MDTMesoscale DiscussionSPC63 min
Jul 1, 8:59 PM MDTMesoscale DiscussionSPC91 min
Jul 1, 9:24 PM MDTSevere Thunderstorm WarningBYZ54 min
Jul 1, 9:45 PM MDTSevere Thunderstorm WatchSPC5 hr
Jul 2, 12:43 AM MDTMesoscale DiscussionSPC2 hr
Jul 2, 3:43 PM MDTMesoscale DiscussionSPC92 min
Jul 3, 12:15 AM MDTSevere Thunderstorm WarningBYZ60 min
Jul 3, 12:43 AM MDTMesoscale DiscussionSPC3 hr
Jul 12, 1:03 PM MDTMesoscale DiscussionSPC87 min
Jul 12, 2:06 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 12, 7:14 PM MDTMesoscale DiscussionSPC61 min
Jul 12, 9:07 PM MDTSevere Thunderstorm WarningBYZ24 min
Jul 18, 4:43 PM MDTMesoscale DiscussionSPC92 min
Jul 18, 5:42 PM MDTSpecial Weather StatementBYZ63 min
Jul 18, 6:00 PM MDTSevere Thunderstorm WarningBYZ60 min
Jul 18, 6:05 PM MDTSevere Thunderstorm WarningBYZ55 min
Jul 18, 6:21 PM MDTSevere Thunderstorm WatchSPC6 hr
Jul 18, 6:28 PM MDTSevere Thunderstorm WarningBYZ62 min
Jul 18, 6:30 PM MDTSevere Thunderstorm WarningBYZ60 min
Jul 18, 6:55 PM MDTSevere Thunderstorm WarningBYZ65 min
Jul 18, 7:32 PM MDTSevere Thunderstorm WarningBYZ58 min
Jul 18, 10:43 PM MDTSpecial Weather StatementBYZ62 min
Jul 19, 1:31 PM MDTSevere Thunderstorm WarningBYZ59 min
Jul 19, 2:21 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 21, 6:29 AM MDTSpecial Weather StatementBYZ31 min
Jul 21, 8:21 AM MDTSpecial Weather StatementBYZ54 min
Jul 21, 1:29 PM MDTMesoscale DiscussionSPC2 hr
Jul 21, 10:31 PM MDTSevere Thunderstorm WarningBYZ59 min
Jul 21, 10:37 PM MDTMesoscale DiscussionSPC53 min
Jul 21, 11:19 PM MDTSpecial Weather StatementBYZ56 min
Jul 22, 12:21 AM MDTSpecial Weather StatementBYZ54 min
Jul 23, 9:12 AM MDTSpecial Weather StatementBYZ48 min
Jul 26, 4:15 PM MDTSevere Thunderstorm WatchSPC10 hr
Jul 26, 6:14 PM MDTSevere Thunderstorm WarningBYZ35 min
Jul 31, 7:24 AM MDTSpecial Weather StatementBYZ66 min
Jul 31, 12:01 PM MDTMesoscale DiscussionSPC89 min
Jul 31, 8:05 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 1, 12:49 AM MDTMesoscale DiscussionSPC56 min
Aug 1, 5:37 PM MDTMesoscale DiscussionSPC113 min
Aug 3, 6:52 AM MDTMesoscale DiscussionSPC83 min
Aug 3, 7:01 AM MDTSpecial Weather StatementBYZ59 min
Aug 6, 1:16 PM MDTMesoscale DiscussionSPC89 min
Aug 6, 2:27 PM MDTSevere Thunderstorm WatchSPC9 hr
Aug 6, 8:23 PM MDTMesoscale DiscussionSPC97 min
Aug 9, 5:59 PM MDTSevere Thunderstorm WatchSPC7 hr
Aug 9, 8:02 PM MDTMesoscale DiscussionSPC58 min
Aug 9, 10:07 PM MDTSpecial Weather StatementBYZ53 min
Aug 12, 2:47 PM MDTMesoscale DiscussionSPC88 min
Aug 21, 7:02 PM MDTSpecial Weather StatementBYZ58 min
Aug 22, 3:52 AM MDTRed Flag WarningBYZ14 hr
Aug 24, 3:43 PM MDTFire Weather WatchBYZ24 hr
Aug 25, 3:42 PM MDTRed Flag WarningBYZ47 hr
Aug 29, 3:57 PM MDTMesoscale DiscussionSPC93 min
Aug 29, 10:06 PM MDTSpecial Weather StatementBYZ54 min
Aug 30, 11:32 AM MDTMesoscale DiscussionSPC28 min
Aug 30, 3:49 PM MDTMesoscale DiscussionSPC56 min
Sep 4, 6:54 PM MDTSpecial Weather StatementBYZ51 min
Sep 5, 11:27 AM MDTSpecial Weather StatementBYZ63 min
Sep 9, 2:35 PM MDTSevere Thunderstorm WatchSPC8 hr
Sep 9, 4:39 PM MDTSevere Thunderstorm WarningBYZ32 min
Sep 9, 5:50 PM MDTSpecial Weather StatementBYZ40 min
Nov 15, 3:47 PM MSTWinter Weather AdvisoryBYZ36 hr
Nov 18, 3:52 PM MSTWinter Weather AdvisoryBYZ60 hr
Nov 21, 3:15 PM MSTWinter Weather AdvisoryBYZ20 hr
Nov 21, 7:59 PM MSTMesoscale DiscussionSPC6 hr
Nov 22, 3:30 PM MSTWinter Weather AdvisoryBYZ4 days
Nov 28, 4:31 AM MSTWinter Weather AdvisoryBYZ35 hr
Nov 28, 5:10 PM MSTWinter Storm WarningBYZ12 hr
Dec 4, 9:43 PM MSTDense Fog AdvisoryBYZ13 hr
Dec 5, 2:53 PM MSTDense Fog AdvisoryBYZ12 hr
Dec 12, 3:47 AM MSTFreezing Rain AdvisoryBYZ24 hr
Dec 19, 3:57 AM MSTWinter Weather AdvisoryBYZ31 hr
Dec 24, 6:24 PM MSTDense Fog AdvisoryBYZ18 hr
Dec 29, 3:49 AM MSTWinter Weather AdvisoryBYZ59 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 archive20092011

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.