Alert archive / Montana / Carter County

Weather alerts in Carter County, Montana, 2017

90 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Carter County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
90
Warnings
16
Watches
10
Advisories
19
Busiest month
July29 alerts
Busiest day
July 18, 20177 alerts

Over time

By month

Warning verification

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

Carter County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings4325%978%44 min
Flash flood warnings00

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Billings, MT: severe thunderstorm warnings311552%5845%23 min
NWS Billings, MT: flash flood warnings110%1100%45 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 3, 2:31 PM MSTWind Chill AdvisoryBYZ45 hr
Jan 3, 2:31 PM MSTWinter Weather AdvisoryBYZ24 hr
Jan 5, 12:07 PM MSTWind Chill AdvisoryBYZ19 hr
Jan 9, 3:00 AM MSTSpecial Weather StatementBYZ4 hr
Jan 9, 9:27 PM MSTWinter Weather AdvisoryBYZ6 hr
Jan 11, 3:49 AM MSTSpecial Weather StatementBYZ5 hr
Jan 11, 2:31 PM MSTWind Chill AdvisoryBYZ20 hr
Jan 12, 2:16 PM MSTWind Chill AdvisoryBYZ19 hr
Jan 21, 3:21 AM MSTDense Fog AdvisoryBYZ7 hr
Jan 23, 8:46 AM MSTSpecial Weather StatementBYZ3 hr
Mar 5, 3:43 AM MSTWinter Weather AdvisoryBYZ34 hr
Mar 8, 3:24 PM MSTWinter Weather AdvisoryBYZ53 hr
Mar 20, 12:38 PM MDTWinter Weather AdvisoryBYZ18 hr
Mar 22, 7:23 AM MDTSpecial Weather StatementBYZ112 min
Apr 8, 3:07 PM MDTWinter Weather AdvisoryBYZ42 hr
Apr 17, 7:11 PM MDTSpecial Weather StatementBYZ64 min
Apr 24, 4:15 AM MDTWinter Storm WatchBYZ9 hr
Apr 24, 4:15 AM MDTWinter Weather AdvisoryBYZ34 hr
May 7, 5:35 PM MDTMesoscale DiscussionSPC2 hr
May 13, 4:41 PM MDTMesoscale DiscussionSPC64 min
May 13, 6:00 PM MDTSpecial Weather StatementBYZ60 min
May 13, 7:04 PM MDTSpecial Weather StatementBYZ26 min
May 13, 8:44 PM MDTSpecial Weather StatementBYZ46 min
May 13, 9:20 PM MDTSpecial Weather StatementBYZ25 min
May 13, 10:35 PM MDTSpecial Weather StatementBYZ40 min
May 13, 11:26 PM MDTSpecial Weather StatementBYZ49 min
May 15, 3:07 PM MDTMesoscale DiscussionSPC113 min
May 15, 4:40 PM MDTSevere Thunderstorm WatchSPC7 hr
May 15, 6:30 PM MDTSevere Thunderstorm WarningBYZ60 min
May 15, 6:34 PM MDTMesoscale DiscussionSPC56 min
May 24, 4:59 PM MDTSpecial Weather StatementBYZ61 min
May 24, 5:43 PM MDTSpecial Weather StatementBYZ62 min
Jun 20, 10:49 PM MDTSpecial Weather StatementBYZ86 min
Jun 28, 2:28 PM MDTMesoscale DiscussionSPC2 hr
Jul 2, 4:16 PM MDTSpecial Weather StatementBYZ74 min
Jul 8, 3:09 AM MDTFire Weather WatchBYZ24 hr
Jul 10, 3:44 PM MDTSpecial Weather StatementBYZ46 min
Jul 10, 3:45 PM MDTSpecial Weather StatementBYZ45 min
Jul 10, 4:08 PM MDTMesoscale DiscussionSPC2 hr
Jul 10, 4:47 PM MDTMesoscale DiscussionSPC88 min
Jul 10, 6:32 PM MDTSevere Thunderstorm WarningBYZ73 min
Jul 10, 7:52 PM MDTSpecial Weather StatementBYZ53 min
Jul 15, 3:09 AM MDTFire Weather WatchBYZ12 hr
Jul 15, 2:48 PM MDTRed Flag WarningBYZ33 hr
Jul 17, 10:03 PM MDTSpecial Weather StatementBYZ42 min
Jul 17, 10:20 PM MDTSpecial Weather StatementUNR25 min
Jul 17, 10:44 PM MDTSpecial Weather StatementBYZ31 min
Jul 18, 2:22 PM MDTMesoscale DiscussionSPC2 hr
Jul 18, 4:09 PM MDTSpecial Weather StatementBYZ36 min
Jul 18, 4:36 PM MDTSevere Thunderstorm WarningBYZ54 min
Jul 18, 5:24 PM MDTSevere Thunderstorm WarningBYZ66 min
Jul 19, 3:44 AM MDTSpecial Weather StatementBYZ31 min
Jul 20, 2:32 PM MDTMesoscale DiscussionSPC58 min
Jul 20, 2:50 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 20, 2:58 PM MDTRed Flag WarningBYZ30 hr
Jul 20, 3:49 PM MDTSpecial Weather StatementBYZ56 min
Jul 20, 4:45 PM MDTMesoscale DiscussionSPC90 min
Jul 20, 4:48 PM MDTSpecial Weather StatementBYZ57 min
Jul 22, 3:07 AM MDTRed Flag WarningBYZ18 hr
Jul 23, 11:44 PM MDTSpecial Weather StatementBYZ61 min
Jul 27, 11:10 AM MDTSpecial Weather StatementBYZ50 min
Jul 27, 11:39 AM MDTSpecial Weather StatementBYZ66 min
Jul 31, 4:52 PM MDTSpecial Weather StatementBYZ38 min
Aug 14, 4:36 PM MDTMesoscale DiscussionSPC114 min
Aug 14, 5:30 PM MDTSpecial Weather StatementBYZ45 min
Aug 14, 8:25 PM MDTSpecial Weather StatementBYZ50 min
Aug 14, 9:33 PM MDTSpecial Weather StatementBYZ42 min
Aug 16, 3:09 AM MDTFire Weather WatchBYZ12 hr
Aug 16, 2:44 PM MDTRed Flag WarningBYZ30 hr
Aug 25, 2:46 PM MDTMesoscale DiscussionSPC89 min
Aug 25, 5:40 PM MDTSpecial Weather StatementBYZ35 min
Aug 30, 3:37 AM MDTRed Flag WarningBYZ17 hr
Aug 31, 2:58 PM MDTFire Weather WatchBYZ12 hr
Sep 1, 2:29 AM MDTRed Flag WarningBYZ18 hr
Sep 1, 2:29 PM MDTFire Weather WatchBYZ24 hr
Sep 2, 2:50 PM MDTRed Flag WarningBYZ54 hr
Sep 7, 2:15 PM MDTRed Flag WarningBYZ30 hr
Oct 19, 2:27 PM MDTRed Flag WarningBYZ30 hr
Oct 21, 3:11 AM MDTHigh Wind WarningBYZ47 hr
Oct 23, 3:04 PM MDTFire Weather WatchBYZ24 hr
Oct 24, 3:01 PM MDTRed Flag WarningBYZ36 hr
Nov 3, 3:36 AM MDTWinter Weather AdvisoryBYZ36 hr
Nov 11, 9:09 PM MSTDense Fog AdvisoryBYZ14 hr
Nov 28, 2:33 PM MSTHigh Wind WatchBYZ12 hr
Nov 29, 3:02 AM MSTHigh Wind WarningBYZ14 hr
Dec 2, 2:02 PM MSTWinter Weather AdvisoryBYZ44 hr
Dec 4, 2:46 PM MSTWinter Weather AdvisoryBYZ47 hr
Dec 24, 3:34 AM MSTWind Chill AdvisoryBYZ30 hr
Dec 28, 4:29 AM MSTWinter Weather AdvisoryBYZ59 hr
Dec 30, 3:38 PM MSTWind Chill AdvisoryBYZ18 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 archive20162018

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.