Weather alerts in Valley County, Montana, 2023

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

Valley County and its neighbors

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

Alerts: 198
Warnings: 53
Watches: 13
Advisories: 87
Busiest month: July37 alerts
Busiest day: May 24, 20237 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 Valley County in 2023 had a tornado report inside them; 0 of 2 tornado reports fell inside a warning.

Valley County, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	2	0%
Severe thunderstorm warnings	24	10	58%	14	79%	38 min
Flash flood warnings	2	1	50%	4	25%	15 min

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Glasgow, MT: tornado warnings	1	0	100%	2	0%
NWS Glasgow, MT: severe thunderstorm warnings	73	26	64%	69	74%	33 min
NWS Glasgow, MT: flash flood warnings	8	2	75%	7	29%	11 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.

Issued	Product	Office	Lasted
Jan 2, 9:50 AM MST	Dense Fog Advisory	GGW	53 hr
Jan 10, 6:57 PM MST	Dense Fog Advisory	GGW	44 hr
Jan 13, 1:29 PM MST	Winter Weather Advisory	GGW	29 hr
Jan 14, 7:11 PM MST	Dense Fog Advisory	GGW	63 hr
Jan 18, 7:02 PM MST	Dense Fog Advisory	GGW	40 hr
Jan 27, 12:31 PM MST	Wind Chill Advisory	GGW	3 days
Jan 30, 12:55 PM MST	Wind Chill Advisory	GGW	19 hr
Feb 1, 7:07 PM MST	Wind Chill Advisory	GGW	35 hr
Feb 19, 2:55 AM MST	Winter Storm Watch	GGW	24 hr
Feb 20, 2:40 AM MST	Winter Storm Warning	GGW	36 hr
Feb 20, 2:40 AM MST	Winter Weather Advisory	GGW	39 hr
Feb 20, 2:34 PM MST	Blizzard Warning	GGW	24 hr
Feb 21, 2:38 PM MST	Wind Chill Advisory	GGW	4 days
Feb 27, 7:58 PM MST	Winter Weather Advisory	GGW	33 hr
Mar 5, 2:20 PM MST	Winter Weather Advisory	GGW	50 hr
Mar 9, 2:44 AM MST	Winter Storm Watch	GGW	24 hr
Mar 10, 3:05 AM MST	Blizzard Warning	GGW	41 hr
Mar 10, 3:05 AM MST	Winter Storm Warning	GGW	7 hr
Mar 10, 3:05 AM MST	Winter Weather Advisory	GGW	39 hr
Mar 10, 9:44 AM MST	Winter Storm Warning	GGW	32 hr
Mar 10, 4:51 PM MST	Mesoscale Discussion	SPC	4 hr
Mar 14, 2:44 AM MDT	Winter Weather Advisory	GGW	48 hr
Mar 14, 9:40 AM MDT	Winter Weather Advisory	GGW	4 hr
Mar 14, 1:35 PM MDT	Winter Storm Warning	GGW	37 hr
Mar 16, 2:13 PM MDT	Wind Chill Advisory	GGW	43 hr
Mar 18, 1:26 AM MDT	Dense Fog Advisory	GGW	10 hr
Mar 23, 3:08 AM MDT	Dense Fog Advisory	GGW	8 hr
Mar 24, 2:23 AM MDT	Dense Fog Advisory	GGW	8 hr
Mar 26, 2:57 AM MDT	Dense Fog Advisory	GGW	7 hr
Apr 1, 2:21 AM MDT	Winter Weather Advisory	GGW	31 hr
Apr 2, 2:24 PM MDT	Winter Weather Advisory	GGW	21 hr
Apr 9, 10:02 AM MDT	Areal Flood Advisory	GGW	7 days
Apr 9, 8:54 PM MDT	Areal Flood Advisory	GGW	7 days
Apr 10, 5:23 AM MDT	River Flood Warning	GGW	8 days
Apr 11, 2:52 PM MDT	Areal Flood Warning	GGW	21 hr
Apr 11, 9:15 PM MDT	River Flood Warning	GGW	14 days
Apr 11, 9:18 PM MDT	River Flood Warning	GGW	13 days
Apr 12, 12:23 PM MDT	River Flood Warning	GGW	13 days
Apr 12, 12:54 PM MDT	River Flood Warning	GGW	8 days
Apr 12, 2:42 PM MDT	Winter Storm Warning	GGW	36 hr
Apr 12, 2:42 PM MDT	Winter Weather Advisory	GGW	36 hr
Apr 16, 2:30 PM MDT	Areal Flood Advisory	GGW	8 days
Apr 17, 2:13 PM MDT	Winter Storm Watch	GGW	25 hr
Apr 18, 2:56 PM MDT	Winter Storm Warning	GGW	36 hr
Apr 18, 2:56 PM MDT	Winter Weather Advisory	GGW	36 hr
Apr 20, 2:31 AM MDT	Winter Weather Advisory	GGW	12 hr
May 2, 2:17 PM MDT	Lake Wind Advisory	GGW	5 hr
May 3, 7:13 PM MDT	Lake Wind Advisory	GGW	71 hr
May 9, 8:04 PM MDT	Special Weather Statement	GGW	56 min
May 12, 2:26 PM MDT	Lake Wind Advisory	GGW	28 hr
May 16, 12:53 PM MDT	Lake Wind Advisory	GGW	29 hr
May 17, 7:23 AM MDT	Dense Smoke Advisory	GGW	19 hr
May 20, 7:43 PM MDT	Dense Smoke Advisory	GGW	18 hr
May 22, 8:01 PM MDT	Special Weather Statement	GGW	59 min
May 24, 3:16 PM MDT	Special Weather Statement	GGW	59 min
May 24, 4:04 PM MDT	Mesoscale Discussion	SPC	116 min
May 24, 4:26 PM MDT	Severe Thunderstorm Warning	GGW	37 min
May 24, 4:35 PM MDT	Special Weather Statement	GGW	55 min
May 24, 4:37 PM MDT	Severe Thunderstorm Warning	GGW	53 min
May 24, 5:16 PM MDT	Special Weather Statement	GGW	59 min
May 24, 5:48 PM MDT	Severe Thunderstorm Warning	GGW	26 min
May 24, 6:12 PM MDT	Special Weather Statement	GGW	63 min
May 24, 6:51 PM MDT	Special Weather Statement	GGW	54 min
May 25, 9:56 AM MDT	Flood Watch	GGW	62 hr
May 25, 12:49 PM MDT	Mesoscale Discussion	SPC	116 min
May 25, 8:27 PM MDT	Special Weather Statement	GGW	63 min
May 25, 9:23 PM MDT	Special Weather Statement	GGW	67 min
May 25, 10:37 PM MDT	Special Weather Statement	GGW	53 min
May 25, 11:29 PM MDT	Special Weather Statement	GGW	61 min
May 25, 11:59 PM MDT	Areal Flood Advisory	GGW	10 hr
May 27, 5:42 PM MDT	Severe Thunderstorm Warning	GGW	63 min
May 27, 5:54 PM MDT	Mesoscale Discussion	SPC	96 min
May 27, 6:23 PM MDT	Severe Thunderstorm Warning	GGW	67 min
May 27, 6:42 PM MDT	Areal Flood Advisory	GGW	3 hr
May 27, 7:25 PM MDT	Special Weather Statement	GGW	65 min
May 27, 7:32 PM MDT	Areal Flood Advisory	GGW	3 hr
May 27, 8:26 PM MDT	Special Weather Statement	GGW	64 min
May 29, 2:42 PM MDT	Special Weather Statement	GGW	63 min
May 29, 6:31 PM MDT	Special Weather Statement	GGW	59 min
May 30, 9:17 AM MDT	Areal Flood Advisory	GGW	23 hr
May 31, 1:41 PM MDT	Flood Watch	GGW	4 days
Jun 1, 8:06 PM MDT	Tornado Warning	GGW	24 min
Jun 1, 8:29 PM MDT	Severe Thunderstorm Warning	GGW	30 min
Jun 1, 11:57 PM MDT	Special Weather Statement	GGW	63 min
Jun 2, 5:10 PM MDT	Special Weather Statement	GGW	50 min
Jun 2, 5:52 PM MDT	Areal Flood Advisory	GGW	6 hr
Jun 2, 6:23 PM MDT	Severe Thunderstorm Warning	GGW	52 min
Jun 2, 7:03 PM MDT	Special Weather Statement	GGW	57 min
Jun 2, 7:15 PM MDT	Flash Flood Warning	GGW	6 hr
Jun 2, 7:23 PM MDT	Special Weather Statement	GGW	67 min
Jun 3, 12:50 AM MDT	Areal Flood Warning	GGW	4 days
Jun 3, 8:13 PM MDT	River Flood Warning	GGW	4 days
Jun 6, 2:21 PM MDT	Flood Watch	GGW	4 days
Jun 6, 2:55 PM MDT	Severe Thunderstorm Warning	GGW	65 min
Jun 7, 8:50 AM MDT	Areal Flood Advisory	GGW	17 hr
Jun 7, 2:02 PM MDT	Severe Thunderstorm Warning	GGW	27 min
Jun 7, 5:01 PM MDT	Severe Thunderstorm Warning	GGW	41 min
Jun 8, 2:06 AM MDT	Flash Flood Warning	GGW	10 hr
Jun 15, 2:36 AM MDT	Lake Wind Advisory	GGW	18 hr
Jun 18, 2:57 PM MDT	Mesoscale Discussion	SPC	93 min
Jun 23, 2:17 PM MDT	Lake Wind Advisory	GGW	6 hr
Jun 27, 12:32 PM MDT	Special Weather Statement	GGW	58 min
Jun 27, 12:45 PM MDT	Areal Flood Advisory	GGW	88 min
Jul 2, 2:20 AM MDT	Lake Wind Advisory	GGW	18 hr
Jul 4, 2:04 AM MDT	Lake Wind Advisory	GGW	16 hr
Jul 10, 4:59 PM MDT	Lake Wind Advisory	GGW	17 hr
Jul 11, 1:04 PM MDT	Mesoscale Discussion	SPC	116 min
Jul 11, 1:56 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 11, 2:08 PM MDT	Severe Thunderstorm Warning	GGW	67 min
Jul 11, 3:13 PM MDT	Severe Thunderstorm Warning	GGW	37 min
Jul 11, 5:00 PM MDT	Special Weather Statement	GGW	60 min
Jul 11, 5:45 PM MDT	Special Weather Statement	GGW	60 min
Jul 11, 7:03 PM MDT	Special Weather Statement	GGW	57 min
Jul 12, 2:13 PM MDT	Lake Wind Advisory	GGW	30 hr
Jul 13, 4:26 PM MDT	Special Weather Statement	GGW	64 min
Jul 13, 8:23 PM MDT	Lake Wind Advisory	GGW	24 hr
Jul 14, 3:18 PM MDT	Dense Smoke Advisory	GGW	47 hr
Jul 14, 7:25 PM MDT	Special Weather Statement	GGW	65 min
Jul 17, 3:02 AM MDT	Lake Wind Advisory	GGW	42 hr
Jul 17, 9:58 PM MDT	Special Weather Statement	GGW	62 min
Jul 17, 10:39 PM MDT	Severe Thunderstorm Warning	GGW	49 min
Jul 18, 8:43 PM MDT	Lake Wind Advisory	GGW	21 hr
Jul 21, 2:17 PM MDT	Heat Advisory	GGW	4 days
Jul 22, 9:29 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	61 min
Jul 22, 10:25 PM MDT	Severe Thunderstorm Warning	GGW	65 min
Jul 23, 10:33 AM MDT	Red Flag Warning	GGW	10 hr
Jul 24, 2:32 AM MDT	Fire Weather Watch	GGW	24 hr
Jul 24, 8:51 PM MDT	Special Weather Statement	GGW	54 min
Jul 25, 2:51 AM MDT	Lake Wind Advisory	GGW	15 hr
Jul 25, 2:55 AM MDT	Red Flag Warning	GGW	18 hr
Jul 25, 4:54 PM MDT	Severe Thunderstorm Warning	GGW	36 min
Jul 26, 2:30 AM MDT	Red Flag Warning	GGW	19 hr
Jul 30, 2:15 AM MDT	Severe Thunderstorm Warning	GGW	35 min
Jul 30, 2:41 AM MDT	Special Weather Statement	GGW	64 min
Jul 30, 3:42 PM MDT	Mesoscale Discussion	SPC	93 min
Jul 30, 3:49 PM MDT	Severe Thunderstorm Warning	GGW	56 min
Jul 30, 4:38 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	67 min
Jul 30, 10:23 PM MDT	Special Weather Statement	GGW	67 min
Jul 30, 10:54 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Jul 30, 11:42 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	63 min
Aug 1, 3:53 AM MDT	Severe Thunderstorm Warning	GGW	67 min
Aug 1, 4:59 AM MDT	Severe Thunderstorm Warning	GGW	61 min
Aug 8, 3:27 PM MDT	Special Weather Statement	GGW	63 min
Aug 8, 10:02 PM MDT	Special Weather Statement	GGW	58 min
Aug 9, 2:21 PM MDT	Lake Wind Advisory	GGW	30 hr
Aug 9, 2:23 PM MDT	Red Flag Warning	GGW	30 hr
Aug 12, 5:20 PM MDT	Lake Wind Advisory	GGW	5 hr
Aug 15, 2:36 PM MDT	Lake Wind Advisory	GGW	30 hr
Aug 16, 2:36 PM MDT	Fire Weather Watch	GGW	23 hr
Aug 17, 2:41 AM MDT	Heat Advisory	GGW	43 hr
Aug 17, 2:05 PM MDT	Red Flag Warning	GGW	31 hr
Aug 18, 3:04 AM MDT	Lake Wind Advisory	GGW	18 hr
Aug 18, 8:02 PM MDT	Severe Thunderstorm Warning Considerable damage threat	GGW	58 min
Aug 18, 11:31 PM MDT	Lake Wind Advisory	GGW	12 hr
Aug 19, 1:44 PM MDT	Lake Wind Advisory	GGW	25 hr
Aug 22, 12:44 AM MDT	Special Weather Statement	GGW	61 min
Aug 28, 1:47 PM MDT	Lake Wind Advisory	GGW	3 days
Aug 29, 3:06 AM MDT	Red Flag Warning	GGW	22 hr
Aug 30, 8:31 PM MDT	Special Weather Statement	GGW	59 min
Sep 3, 6:31 PM MDT	Special Weather Statement	GGW	59 min
Sep 3, 7:30 PM MDT	Special Weather Statement	GGW	60 min
Sep 4, 2:32 AM MDT	Lake Wind Advisory	GGW	17 hr
Sep 4, 11:30 AM MDT	Dense Smoke Advisory	GGW	39 hr
Sep 7, 2:03 PM MDT	Lake Wind Advisory	GGW	6 hr
Sep 8, 7:06 PM MDT	Special Weather Statement	GGW	69 min
Sep 15, 1:47 PM MDT	Fire Weather Watch	GGW	24 hr
Sep 16, 1:38 PM MDT	Red Flag Warning	GGW	55 hr
Sep 19, 9:40 AM MDT	Lake Wind Advisory	GGW	8 hr
Sep 20, 10:04 PM MDT	Lake Wind Advisory	GGW	56 hr
Sep 21, 7:17 PM MDT	Special Weather Statement	GGW	58 min
Sep 23, 11:39 PM MDT	Dense Fog Advisory	GGW	10 hr
Sep 25, 2:12 PM MDT	Lake Wind Advisory	GGW	31 hr
Sep 27, 6:53 PM MDT	Lake Wind Advisory	GGW	19 hr
Sep 29, 2:16 PM MDT	Lake Wind Advisory	GGW	30 hr
Oct 1, 2:13 AM MDT	Special Weather Statement	GGW	62 min
Oct 1, 8:27 AM MDT	Areal Flood Advisory	GGW	4 hr
Oct 2, 2:09 PM MDT	Lake Wind Advisory	GGW	30 hr
Oct 4, 2:29 AM MDT	Lake Wind Advisory	GGW	44 hr
Oct 10, 2:35 AM MDT	Lake Wind Advisory	GGW	39 hr
Oct 15, 2:18 PM MDT	High Wind Watch	GGW	20 hr
Oct 16, 2:29 AM MDT	Fire Weather Watch	GGW	8 hr
Oct 16, 10:00 AM MDT	Red Flag Warning	GGW	35 hr
Oct 16, 10:01 AM MDT	High Wind Warning	GGW	43 hr
Oct 19, 2:26 PM MDT	Lake Wind Advisory	GGW	22 hr
Oct 23, 3:11 AM MDT	Winter Storm Watch	GGW	35 hr
Oct 24, 2:43 AM MDT	Winter Storm Warning	GGW	63 hr
Oct 24, 1:55 PM MDT	Winter Weather Advisory	GGW	62 hr
Oct 26, 5:54 PM MDT	Winter Weather Advisory	GGW	10 hr
Nov 2, 5:23 AM MDT	Dense Fog Advisory	GGW	6 hr
Nov 2, 2:02 PM MDT	Winter Weather Advisory	GGW	22 hr
Nov 3, 5:14 PM MDT	Dense Fog Advisory	GGW	27 hr
Nov 5, 2:24 AM MST	Lake Wind Advisory	GGW	19 hr
Nov 7, 2:57 AM MST	Lake Wind Advisory	GGW	41 hr
Nov 10, 1:47 PM MST	Lake Wind Advisory	GGW	51 hr
Nov 15, 3:19 PM MST	Lake Wind Advisory	GGW	16 hr
Nov 19, 2:07 AM MST	Lake Wind Advisory	GGW	39 hr
Nov 25, 2:22 AM MST	Lake Wind Advisory	GGW	24 hr
Dec 6, 2:08 PM MST	Winter Weather Advisory	GGW	48 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	24
Tornado Warning	1
Severe Thunderstorm Watch	1
Mesoscale Discussion	7
Special Weather Statement	38
Flooding
Areal Flood Warning	2
Flash Flood Warning	2
River Flood Warning	6
Flood Watch	3
Areal Flood Advisory	11
Winter
Blizzard Warning	2
Winter Storm Warning	7
Winter Storm Watch	4
Winter Weather Advisory	16
Heat
Heat Advisory	2
Cold
Wind Chill Advisory	5
Wind and dust
High Wind Warning	1
High Wind Watch	1
Lake Wind Advisory	38
Fire
Red Flag Warning	8
Fire Weather Watch	4
Fog and smoke
Dense Fog Advisory	11
Dense Smoke Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2022 2024

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.