Weather alerts in Custer County, Montana, 2025

157 weather alerts in 2025, 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 2025. Tap one for its archive.

Alerts: 157
Warnings: 63
Watches: 20
Advisories: 24
Busiest month: July58 alerts
Busiest day: June 16, 202512 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 1 tornado warnings covering Custer County in 2025 had a tornado report inside them.

Custer County, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	55	19	65%	17	59%	23 min
Flash flood warnings	2	0	100%	1	0%

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Billings, MT: tornado warnings	4	1	75%	1	100%	2 min
NWS Billings, MT: severe thunderstorm warnings	260	77	70%	213	67%	27 min
NWS Billings, MT: flash flood warnings	20	0	100%	3	0%

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.

Issued	Product	Office	Lasted
Jan 2, 1:09 AM MST	Winter Weather Advisory	BYZ	3 days
Jan 2, 1:42 PM MST	Winter Storm Watch	BYZ	25 hr
Jan 3, 2:24 AM MST	Winter Weather Advisory	BYZ	48 hr
Jan 9, 1:14 PM MST	Winter Storm Watch	BYZ	26 hr
Jan 10, 3:06 PM MST	Winter Weather Advisory	BYZ	52 hr
Jan 18, 1:28 AM MST	Cold Weather Advisory	BYZ	3 days
Jan 21, 2:17 AM MST	Winter Weather Advisory	BYZ	51 hr
Jan 31, 2:34 AM MST	Winter Storm Warning	BYZ	6 days
Feb 2, 3:14 AM MST	Winter Weather Advisory	BYZ	41 hr
Feb 2, 8:31 PM MST	Cold Weather Advisory	BYZ	38 hr
Feb 5, 2:56 PM MST	Special Weather Statement	BYZ	2 hr
Feb 6, 1:54 AM MST	Winter Weather Advisory	BYZ	46 hr
Feb 10, 1:25 AM MST	Cold Weather Advisory	BYZ	34 hr
Feb 11, 2:48 PM MST	Cold Weather Advisory	BYZ	21 hr
Feb 12, 2:10 PM MST	Cold Weather Advisory	BYZ	20 hr
Feb 16, 1:50 PM MST	Extreme Cold Warning	BYZ	69 hr
Feb 19, 11:14 AM MST	Cold Weather Advisory	BYZ	25 hr
Feb 25, 8:42 AM MST	Areal Flood Advisory	BYZ	10 hr
Mar 23, 2:57 AM MDT	Special Weather Statement	BYZ	33 min
Apr 12, 6:39 PM MDT	Special Weather Statement	BYZ	51 min
Apr 12, 7:28 PM MDT	Special Weather Statement	BYZ	47 min
Apr 27, 4:34 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 27, 4:37 PM MDT	Severe Thunderstorm Warning	BYZ	38 min
Apr 27, 5:16 PM MDT	Severe Thunderstorm Warning	BYZ	59 min
Apr 27, 5:35 PM MDT	Special Weather Statement	BYZ	40 min
Apr 27, 6:05 PM MDT	Severe Thunderstorm Warning	BYZ	55 min
Apr 27, 6:53 PM MDT	Severe Thunderstorm Warning	BYZ	52 min
Apr 27, 7:44 PM MDT	Severe Thunderstorm Warning	BYZ	61 min
Apr 27, 8:30 PM MDT	Mesoscale Discussion	SPC	90 min
Apr 27, 8:40 PM MDT	Severe Thunderstorm Warning	BYZ	80 min
May 11, 3:57 PM MDT	Mesoscale Discussion	SPC	2 hr
May 11, 4:28 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
May 11, 6:01 PM MDT	Severe Thunderstorm Warning	BYZ	29 min
May 11, 6:12 PM MDT	Severe Thunderstorm Warning	BYZ	48 min
May 11, 6:44 PM MDT	Severe Thunderstorm Warning	BYZ	31 min
May 12, 9:43 PM MDT	Special Weather Statement	BYZ	32 min
May 23, 6:00 PM MDT	Special Weather Statement	BYZ	45 min
Jun 11, 5:41 PM MDT	Severe Thunderstorm Warning	BYZ	33 min
Jun 12, 4:38 PM MDT	Severe Thunderstorm Warning	BYZ	37 min
Jun 13, 11:45 AM MDT	Mesoscale Discussion	SPC	2 hr
Jun 13, 1:03 PM MDT	Severe Thunderstorm Watch	SPC	10 hr
Jun 13, 7:23 PM MDT	Mesoscale Discussion	SPC	97 min
Jun 13, 8:07 PM MDT	Severe Thunderstorm Warning	BYZ	53 min
Jun 13, 8:53 PM MDT	Mesoscale Discussion	SPC	97 min
Jun 13, 8:57 PM MDT	Severe Thunderstorm Warning	BYZ	32 min
Jun 13, 9:17 PM MDT	Severe Thunderstorm Warning	BYZ	35 min
Jun 13, 9:28 PM MDT	Severe Thunderstorm Warning	BYZ	62 min
Jun 13, 10:24 PM MDT	Severe Thunderstorm Warning	BYZ	75 min
Jun 14, 5:04 PM MDT	Mesoscale Discussion	SPC	86 min
Jun 14, 6:16 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 15, 1:13 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 15, 2:15 PM MDT	Severe Thunderstorm Watch	SPC	11 hr
Jun 15, 4:53 PM MDT	Mesoscale Discussion	SPC	97 min
Jun 15, 8:23 PM MDT	Severe Thunderstorm Warning	BYZ	44 min
Jun 15, 9:06 PM MDT	Severe Thunderstorm Warning	BYZ	54 min
Jun 15, 9:22 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	38 min
Jun 15, 9:35 PM MDT	Tornado Warning Tornado observed	BYZ	25 min
Jun 15, 9:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	64 min
Jun 15, 9:49 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	26 min
Jun 15, 10:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	31 min
Jun 15, 10:14 PM MDT	Severe Thunderstorm Warning	BYZ	46 min
Jun 15, 10:44 PM MDT	Flash Flood Warning	BYZ	3 hr
Jun 15, 10:58 PM MDT	Severe Thunderstorm Warning	BYZ	62 min
Jun 15, 11:03 PM MDT	Flash Flood Warning	BYZ	3 hr
Jun 16, 4:52 PM MDT	Mesoscale Discussion	SPC	113 min
Jun 20, 2:46 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 20, 3:41 PM MDT	Severe Thunderstorm Warning	BYZ	21 min
Jun 20, 3:45 PM MDT	Severe Thunderstorm Warning	BYZ	17 min
Jun 20, 4:01 PM MDT	Severe Thunderstorm Warning	BYZ	59 min
Jun 25, 3:21 PM MDT	Mesoscale Discussion	SPC	84 min
Jul 1, 2:01 AM MDT	Heat Advisory	BYZ	42 hr
Jul 2, 9:32 PM MDT	Special Weather Statement	BYZ	43 min
Jul 5, 12:51 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 5, 2:14 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 5, 4:11 PM MDT	Severe Thunderstorm Warning	BYZ	64 min
Jul 5, 4:15 PM MDT	Severe Thunderstorm Warning	BYZ	60 min
Jul 5, 5:11 PM MDT	Special Weather Statement	BYZ	64 min
Jul 5, 5:16 PM MDT	Severe Thunderstorm Warning	BYZ	59 min
Jul 8, 1:27 AM MDT	Heat Advisory	BYZ	44 hr
Jul 17, 2:48 PM MDT	Mesoscale Discussion	SPC	117 min
Jul 17, 8:48 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 17, 9:58 PM MDT	Special Weather Statement	BYZ	47 min
Jul 17, 10:41 PM MDT	Mesoscale Discussion	SPC	94 min
Jul 17, 10:51 PM MDT	Special Weather Statement	BYZ	54 min
Jul 19, 2:46 PM MDT	Mesoscale Discussion	SPC	119 min
Jul 19, 4:10 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 19, 5:50 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	40 min
Jul 19, 6:30 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	60 min
Jul 19, 6:52 PM MDT	Special Weather Statement	BYZ	38 min
Jul 19, 7:25 PM MDT	Special Weather Statement	BYZ	50 min
Jul 19, 7:59 PM MDT	Severe Thunderstorm Warning	BYZ	46 min
Jul 19, 8:11 PM MDT	Mesoscale Discussion	SPC	64 min
Jul 20, 3:45 PM MDT	Mesoscale Discussion	SPC	90 min
Jul 20, 4:09 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 20, 5:26 PM MDT	Severe Thunderstorm Warning	BYZ	38 min
Jul 20, 6:08 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	24 min
Jul 20, 6:31 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	48 min
Jul 20, 6:55 PM MDT	Mesoscale Discussion	SPC	95 min
Jul 20, 7:17 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	58 min
Jul 21, 1:59 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 21, 3:34 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 21, 4:32 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	58 min
Jul 21, 5:28 PM MDT	Severe Thunderstorm Warning	BYZ	62 min
Jul 21, 5:56 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 21, 6:18 PM MDT	Areal Flood Advisory	BYZ	67 min
Jul 21, 6:24 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	66 min
Jul 22, 2:00 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 25, 3:47 PM MDT	Mesoscale Discussion	SPC	88 min
Jul 25, 4:33 PM MDT	Severe Thunderstorm Warning	BYZ	26 min
Jul 25, 5:52 PM MDT	Severe Thunderstorm Warning	BYZ	53 min
Jul 25, 6:43 PM MDT	Special Weather Statement	BYZ	47 min
Jul 25, 7:44 PM MDT	Special Weather Statement	BYZ	31 min
Jul 25, 8:28 PM MDT	Special Weather Statement	BYZ	47 min
Jul 28, 4:02 AM MDT	Mesoscale Discussion	SPC	118 min
Jul 28, 8:22 AM MDT	Severe Thunderstorm Warning	BYZ	53 min
Jul 28, 1:16 PM MDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 28, 9:39 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	45 min
Jul 29, 2:28 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 29, 3:08 PM MDT	Severe Thunderstorm Warning	BYZ	67 min
Jul 29, 4:05 PM MDT	Special Weather Statement	BYZ	40 min
Jul 29, 4:17 PM MDT	Severe Thunderstorm Warning	BYZ	49 min
Jul 29, 4:34 PM MDT	Severe Thunderstorm Warning	BYZ	41 min
Jul 29, 5:06 PM MDT	Severe Thunderstorm Warning Destructive damage threat	BYZ	54 min
Jul 29, 5:11 PM MDT	Severe Thunderstorm Warning	BYZ	32 min
Jul 29, 5:13 PM MDT	Severe Thunderstorm Warning	BYZ	55 min
Jul 29, 5:54 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	66 min
Jul 29, 5:57 PM MDT	Areal Flood Advisory	BYZ	3 hr
Jul 29, 6:02 PM MDT	Special Weather Statement	BYZ	28 min
Aug 7, 1:49 PM MDT	Mesoscale Discussion	SPC	116 min
Aug 7, 3:50 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 7, 6:28 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 7:54 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	67 min
Aug 7, 9:00 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BYZ	75 min
Aug 7, 9:04 PM MDT	Special Weather Statement	BYZ	41 min
Aug 7, 9:19 PM MDT	Severe Thunderstorm Warning	BYZ	21 min
Aug 17, 9:05 PM MDT	Special Weather Statement	BYZ	55 min
Aug 17, 10:11 PM MDT	Severe Thunderstorm Warning	BYZ	49 min
Aug 18, 1:37 PM MDT	Heat Advisory	BYZ	55 hr
Sep 11, 12:16 AM MDT	Special Weather Statement	BYZ	44 min
Sep 12, 1:32 PM MDT	Mesoscale Discussion	SPC	2 hr
Oct 19, 12:10 PM MDT	High Wind Watch	BYZ	14 hr
Nov 8, 12:14 AM MST	Special Weather Statement	BYZ	2 hr
Nov 27, 1:07 PM MST	Winter Weather Advisory	BYZ	43 hr
Dec 1, 2:17 PM MST	Winter Weather Advisory	BYZ	42 hr
Dec 7, 1:17 AM MST	High Wind Watch	BYZ	36 hr
Dec 8, 1:10 AM MST	High Wind Warning	BYZ	38 hr
Dec 8, 2:08 PM MST	Winter Weather Advisory	BYZ	58 hr
Dec 9, 4:18 PM MST	Winter Storm Watch	BYZ	46 hr
Dec 11, 2:22 AM MST	Winter Storm Warning	BYZ	54 hr
Dec 11, 2:22 AM MST	Winter Weather Advisory	BYZ	54 hr
Dec 16, 3:05 AM MST	High Wind Watch	BYZ	11 hr
Dec 16, 1:43 PM MST	High Wind Warning	BYZ	39 hr
Dec 22, 7:40 AM MST	Special Weather Statement	BYZ	95 min
Dec 24, 9:32 AM MST	Special Weather Statement	BYZ	118 min
Dec 24, 11:37 AM MST	Special Weather Statement	BYZ	113 min
Dec 24, 12:59 PM MST	Dense Fog Advisory	BYZ	16 hr
Dec 27, 12:51 AM MST	Cold Weather Advisory	BYZ	37 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

Product	Alerts
Severe storms
Severe Thunderstorm Warning	55
Tornado Warning	1
Severe Thunderstorm Watch	14
Mesoscale Discussion	25
Special Weather Statement	25
Flooding
Flash Flood Warning	2
Areal Flood Advisory	3
Winter
Winter Storm Warning	2
Winter Storm Watch	3
Winter Weather Advisory	10
Heat
Heat Advisory	3
Cold
Extreme Cold Warning	1
Cold Weather Advisory	7
Wind and dust
High Wind Warning	2
High Wind Watch	3
Fog and smoke
Dense Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2024 2026

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.