Alert archive / Montana / Fallon County

Weather alerts in Fallon County, Montana, 2023

88 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Fallon County and its neighbors

Each county as a circle sized by its count in 2023. Tap one for its archive.

Alerts
88
Warnings
10
Watches
11
Advisories
26
Busiest month
May17 alerts
Busiest day
June 26, 20236 alerts

Over time

By month

Warning verification

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

Fallon County, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings7271%6100%37 min
Flash flood warnings00

Each office's whole area, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Billings, MT: severe thunderstorm warnings852274%8548%22 min
NWS Billings, MT: flash flood warnings431174%2152%78 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, 12:56 AM MSTDense Fog AdvisoryBYZ32 hr
Jan 11, 1:45 AM MSTDense Fog AdvisoryBYZ33 hr
Jan 15, 10:33 PM MSTDense Fog AdvisoryBYZ12 hr
Jan 16, 4:49 PM MSTDense Fog AdvisoryBYZ16 hr
Jan 19, 12:56 AM MSTDense Fog AdvisoryBYZ8 hr
Jan 26, 10:19 AM MSTSpecial Weather StatementBYZ41 min
Jan 27, 6:46 PM MSTSpecial Weather StatementBYZ119 min
Jan 28, 5:02 PM MSTWind Chill AdvisoryBYZ43 hr
Feb 8, 12:45 PM MSTWinter Weather AdvisoryBYZ17 hr
Feb 13, 2:39 AM MSTWinter Weather AdvisoryBYZ44 hr
Feb 19, 2:44 AM MSTWinter Storm WatchBYZ24 hr
Feb 19, 2:44 AM MSTWinter Storm WarningBYZ4 days
Feb 20, 2:25 AM MSTWinter Weather AdvisoryBYZ11 hr
Feb 22, 2:30 AM MSTWinter Weather AdvisoryBYZ23 hr
Feb 22, 1:29 PM MSTWind Chill AdvisoryBYZ46 hr
Feb 27, 1:14 PM MSTWinter Weather AdvisoryBYZ32 hr
Mar 4, 1:13 AM MSTWinter Weather AdvisoryBYZ3 days
Mar 8, 1:03 AM MSTWinter Weather AdvisoryBYZ38 hr
Mar 10, 2:08 AM MSTWinter Weather AdvisoryBYZ24 hr
Mar 11, 9:58 AM MSTSpecial Weather StatementBYZ3 hr
Mar 11, 12:27 PM MSTBlizzard WarningBYZ8 hr
Mar 20, 5:52 AM MDTDense Fog AdvisoryBYZ4 hr
Mar 25, 6:37 AM MDTSpecial Weather StatementBYZ3 hr
Apr 3, 2:37 AM MDTWinter Weather AdvisoryBYZ49 hr
Apr 18, 5:50 AM MDTWinter Weather AdvisoryBYZ63 hr
May 7, 9:39 PM MDTSpecial Weather StatementBYZ51 min
May 9, 1:47 AM MDTFlood WatchBYZ71 hr
May 10, 6:43 PM MDTSpecial Weather StatementBYZ32 min
May 10, 7:31 PM MDTSpecial Weather StatementBYZ29 min
May 10, 7:49 PM MDTAreal Flood AdvisoryBYZ3 hr
May 10, 8:44 PM MDTSpecial Weather StatementBYZ31 min
May 10, 11:11 PM MDTSpecial Weather StatementBYZ49 min
May 17, 8:50 AM MDTSpecial Weather StatementBYZ4 hr
May 23, 7:47 PM MDTSpecial Weather StatementBYZ28 min
May 25, 2:44 AM MDTFlood WatchBYZ45 hr
May 25, 12:49 PM MDTMesoscale DiscussionSPC116 min
May 25, 5:26 PM MDTSpecial Weather StatementBYZ34 min
May 26, 2:42 PM MDTMesoscale DiscussionSPC2 hr
May 26, 4:26 PM MDTSevere Thunderstorm WatchSPC6 hr
May 27, 4:53 PM MDTSpecial Weather StatementBYZ52 min
May 27, 5:01 PM MDTSevere Thunderstorm WarningBYZ41 min
May 27, 5:40 PM MDTSpecial Weather StatementBYZ20 min
Jun 8, 4:36 PM MDTSpecial Weather StatementBYZ24 min
Jun 9, 3:02 AM MDTFlood WatchBYZ24 hr
Jun 18, 6:33 PM MDTSpecial Weather StatementBYZ57 min
Jun 19, 2:51 PM MDTMesoscale DiscussionSPC2 hr
Jun 19, 7:04 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 19, 7:43 PM MDTSevere Thunderstorm Warning Destructive damage threatBYZ62 min
Jun 19, 8:44 PM MDTSevere Thunderstorm Warning Considerable damage threatBYZ31 min
Jun 21, 1:43 PM MDTFlood WatchBYZ3 days
Jun 21, 9:44 PM MDTSpecial Weather StatementBYZ31 min
Jun 21, 10:15 PM MDTSpecial Weather StatementBYZ30 min
Jun 26, 3:03 AM MDTFlood WatchBYZ66 hr
Jun 26, 4:00 PM MDTSevere Thunderstorm WarningBYZ60 min
Jun 26, 4:13 PM MDTAreal Flood AdvisoryBYZ3 hr
Jun 26, 4:33 PM MDTSevere Thunderstorm WarningBYZ27 min
Jun 26, 5:21 PM MDTAreal Flood AdvisoryBYZ3 hr
Jun 26, 5:48 PM MDTSpecial Weather StatementBYZ57 min
Jun 27, 7:12 PM MDTSpecial Weather StatementBYZ33 min
Jul 3, 8:34 PM MDTSpecial Weather StatementBYZ26 min
Jul 11, 1:04 PM MDTMesoscale DiscussionSPC116 min
Jul 11, 1:56 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 11, 5:23 PM MDTSevere Thunderstorm Warning Considerable damage threatBYZ67 min
Jul 11, 6:27 PM MDTMesoscale DiscussionSPC93 min
Jul 11, 8:56 PM MDTSpecial Weather StatementBYZ34 min
Jul 11, 9:24 PM MDTSpecial Weather StatementBYZ36 min
Jul 11, 9:44 PM MDTSevere Thunderstorm WarningBYZ20 min
Jul 18, 5:07 AM MDTSpecial Weather StatementBYZ23 min
Jul 21, 12:19 PM MDTHeat AdvisoryBYZ4 days
Jul 27, 11:07 PM MDTSpecial Weather StatementBYZ23 min
Jul 27, 11:59 PM MDTSpecial Weather StatementBYZ46 min
Jul 30, 3:42 PM MDTMesoscale DiscussionSPC93 min
Jul 30, 4:35 PM MDTSpecial Weather StatementBYZ40 min
Jul 31, 10:21 PM MDTSpecial Weather StatementBYZ24 min
Aug 1, 5:05 PM MDTMesoscale DiscussionSPC85 min
Aug 2, 1:43 PM MDTFlood WatchBYZ60 hr
Aug 3, 1:57 PM MDTAreal Flood AdvisoryBYZ3 hr
Aug 17, 2:20 AM MDTHeat AdvisoryBYZ42 hr
Aug 30, 7:29 PM MDTSpecial Weather StatementBYZ61 min
Sep 4, 4:02 PM MDTSpecial Weather StatementBYZ43 min
Sep 4, 4:48 PM MDTSpecial Weather StatementBYZ42 min
Sep 4, 5:31 PM MDTSpecial Weather StatementBYZ29 min
Sep 24, 5:00 AM MDTSpecial Weather StatementBYZ3 hr
Oct 17, 3:51 PM MDTSpecial Weather StatementBYZ54 min
Oct 22, 8:08 PM MDTWinter Storm WatchBYZ65 hr
Oct 24, 2:23 AM MDTWinter Storm WarningBYZ67 hr
Oct 24, 1:14 PM MDTWinter Weather AdvisoryBYZ53 hr
Dec 7, 2:09 PM MSTWinter Weather AdvisoryBYZ26 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 archive20222024

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.