Weather alerts in Valley County, Montana, 2018

205 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts: 205
Warnings: 50
Watches: 17
Advisories: 97
Busiest month: July33 alerts
Busiest day: July 10, 20187 alerts

Over time

By month

Warning verification

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

Valley County, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	23	13	43%	26	81%	28 min
Flash flood warnings	0			0

Each office's whole area, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Glasgow, MT: tornado warnings	3	1	67%	2	50%	16 min
NWS Glasgow, MT: severe thunderstorm warnings	108	65	40%	166	83%	28 min
NWS Glasgow, MT: flash flood warnings	6	5	17%	9	67%	87 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 5, 3:18 AM MST	Dense Fog Advisory	GGW	11 hr
Jan 9, 3:39 AM MST	Winter Weather Advisory	GGW	42 hr
Jan 10, 3:02 AM MST	Winter Storm Watch	GGW	24 hr
Jan 10, 9:02 AM MST	Wind Chill Advisory	GGW	3 days
Jan 10, 9:02 AM MST	Winter Storm Warning	GGW	10 hr
Jan 11, 3:04 AM MST	Winter Weather Advisory	GGW	27 hr
Jan 12, 3:32 AM MST	Wind Chill Warning	GGW	30 hr
Jan 14, 2:43 AM MST	Wind Chill Advisory	GGW	55 hr
Jan 18, 1:34 PM MST	Winter Weather Advisory	GGW	18 hr
Jan 25, 8:53 PM MST	Winter Weather Advisory	GGW	6 hr
Jan 29, 2:39 PM MST	High Wind Watch	GGW	13 hr
Jan 30, 8:00 AM MST	Special Weather Statement	GGW	60 min
Jan 30, 8:33 AM MST	Special Weather Statement	GGW	57 min
Jan 31, 11:42 AM MST	Wind Chill Advisory	GGW	23 hr
Feb 1, 1:45 PM MST	Winter Storm Watch	GGW	37 hr
Feb 3, 2:37 AM MST	Wind Chill Advisory	GGW	32 hr
Feb 3, 2:37 AM MST	Winter Weather Advisory	GGW	24 hr
Feb 4, 10:38 AM MST	Wind Chill Advisory	GGW	24 hr
Feb 5, 3:34 AM MST	Wind Chill Advisory	GGW	31 hr
Feb 6, 10:57 AM MST	Wind Chill Advisory	GGW	21 hr
Feb 6, 11:29 AM MST	Winter Storm Watch	GGW	25 hr
Feb 7, 12:14 PM MST	Winter Storm Warning	GGW	39 hr
Feb 7, 12:14 PM MST	Winter Weather Advisory	GGW	39 hr
Feb 8, 4:56 PM MST	Wind Chill Advisory	GGW	42 hr
Feb 9, 1:31 PM MST	Wind Chill Warning	GGW	21 hr
Feb 10, 10:52 AM MST	Wind Chill Advisory	GGW	16 hr
Feb 11, 2:25 PM MST	Wind Chill Advisory	GGW	45 hr
Feb 12, 8:10 PM MST	Wind Chill Warning	GGW	14 hr
Feb 13, 2:48 PM MST	Winter Weather Advisory	GGW	44 hr
Feb 16, 3:30 AM MST	Winter Storm Watch	GGW	24 hr
Feb 17, 3:13 AM MST	Winter Weather Advisory	GGW	32 hr
Feb 18, 2:37 PM MST	Wind Chill Advisory	GGW	20 hr
Feb 19, 2:18 PM MST	Wind Chill Advisory	GGW	21 hr
Feb 20, 10:45 AM MST	Wind Chill Advisory	GGW	24 hr
Feb 21, 10:42 AM MST	Wind Chill Advisory	GGW	24 hr
Feb 22, 9:31 PM MST	Wind Chill Advisory	GGW	30 hr
Feb 25, 10:29 AM MST	Winter Weather Advisory	GGW	12 hr
Mar 2, 3:06 AM MST	Winter Storm Watch	GGW	48 hr
Mar 2, 11:27 AM MST	Winter Weather Advisory	GGW	16 hr
Mar 3, 2:27 PM MST	Winter Storm Warning	GGW	57 hr
Mar 11, 3:32 AM MDT	Dense Fog Advisory	GGW	7 hr
Mar 12, 2:42 PM MDT	Dense Fog Advisory	GGW	21 hr
Mar 14, 5:28 AM MDT	Dense Fog Advisory	GGW	7 hr
Mar 15, 2:33 PM MDT	Winter Weather Advisory	GGW	32 hr
Mar 16, 10:41 PM MDT	Winter Weather Advisory	GGW	5 hr
Mar 17, 8:14 AM MDT	Dense Fog Advisory	GGW	4 hr
Mar 17, 9:08 PM MDT	Dense Fog Advisory	GGW	6 hr
Mar 20, 8:46 AM MDT	Dense Fog Advisory	GGW	109 min
Mar 21, 3:21 AM MDT	Dense Fog Advisory	GGW	8 hr
Mar 22, 3:58 AM MDT	Winter Weather Advisory	GGW	38 hr
Mar 24, 3:30 AM MDT	Dense Fog Advisory	GGW	8 hr
Mar 29, 2:28 PM MDT	Winter Weather Advisory	GGW	30 hr
Mar 30, 8:24 PM MDT	Wind Chill Advisory	GGW	13 hr
Mar 31, 2:21 PM MDT	Winter Storm Watch	GGW	24 hr
Apr 1, 3:09 AM MDT	Winter Storm Warning	GGW	48 hr
Apr 1, 2:21 PM MDT	Winter Weather Advisory	GGW	13 hr
Apr 5, 2:58 PM MDT	Wind Chill Advisory	GGW	18 hr
Apr 6, 2:28 PM MDT	Winter Weather Advisory	GGW	45 hr
Apr 7, 4:14 AM MDT	Areal Flood Warning	GGW	4 days
Apr 13, 12:28 PM MDT	Areal Flood Warning	GGW	44 hr
Apr 15, 11:17 AM MDT	Flood Watch	GGW	70 hr
Apr 16, 3:29 AM MDT	Winter Weather Advisory	GGW	39 hr
Apr 16, 3:47 AM MDT	Areal Flood Warning	GGW	9 days
Apr 16, 8:03 AM MDT	Areal Flood Warning	GGW	64 hr
Apr 17, 3:08 PM MDT	River Flood Warning	GGW	3 days
Apr 17, 3:08 PM MDT	River Flood Warning	GGW	15 days
Apr 17, 3:08 PM MDT	River Flood Warning	GGW	17 days
Apr 17, 3:08 PM MDT	River Flood Warning	GGW	20 days
Apr 17, 3:08 PM MDT	River Flood Warning	GGW	19 days
Apr 19, 7:13 AM MDT	Dense Fog Advisory	GGW	4 hr
Apr 25, 1:57 PM MDT	Areal Flood Warning	GGW	64 hr
Apr 25, 2:07 PM MDT	Areal Flood Warning	GGW	64 hr
Apr 27, 2:01 PM MDT	Lake Wind Advisory	GGW	29 hr
Apr 28, 2:56 AM MDT	Red Flag Warning	GGW	17 hr
May 8, 4:49 PM MDT	Special Weather Statement	GGW	41 min
May 8, 5:34 PM MDT	Special Weather Statement	GGW	41 min
May 10, 3:12 AM MDT	Lake Wind Advisory	GGW	17 hr
May 16, 10:21 PM MDT	Special Weather Statement	GGW	39 min
May 17, 3:41 AM MDT	Lake Wind Advisory	GGW	30 hr
May 17, 3:15 PM MDT	Severe Thunderstorm Warning	GGW	30 min
May 17, 4:44 PM MDT	Areal Flood Advisory	GGW	3 hr
May 17, 5:10 PM MDT	Severe Thunderstorm Warning	GGW	50 min
May 17, 5:49 PM MDT	Severe Thunderstorm Warning	GGW	41 min
May 17, 6:25 PM MDT	Areal Flood Advisory	GGW	3 hr
May 17, 6:31 PM MDT	Severe Thunderstorm Warning	GGW	29 min
May 17, 7:03 PM MDT	Severe Thunderstorm Warning	GGW	38 min
May 20, 3:25 AM MDT	Lake Wind Advisory	GGW	17 hr
May 22, 3:31 PM MDT	Special Weather Statement	GGW	44 min
May 22, 4:14 PM MDT	Special Weather Statement	GGW	46 min
May 22, 4:56 PM MDT	Special Weather Statement	GGW	49 min
May 26, 2:21 PM MDT	Mesoscale Discussion	SPC	114 min
May 26, 4:46 PM MDT	Mesoscale Discussion	SPC	119 min
May 26, 5:36 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
May 26, 6:52 PM MDT	Severe Thunderstorm Warning	GGW	53 min
May 26, 7:42 PM MDT	Severe Thunderstorm Warning	GGW	63 min
May 26, 9:13 PM MDT	Mesoscale Discussion	SPC	2 hr
May 26, 9:33 PM MDT	Special Weather Statement	GGW	57 min
May 29, 3:13 AM MDT	Lake Wind Advisory	GGW	17 hr
May 29, 4:01 PM MDT	Special Weather Statement	GGW	44 min
May 30, 1:34 PM MDT	Special Weather Statement	GGW	41 min
May 30, 2:19 PM MDT	Special Weather Statement	GGW	56 min
May 30, 2:39 PM MDT	Special Weather Statement	GGW	66 min
May 30, 3:48 PM MDT	Special Weather Statement	GGW	57 min
May 30, 9:15 PM MDT	Special Weather Statement	GGW	60 min
May 30, 10:08 PM MDT	Severe Thunderstorm Warning	GGW	52 min
Jun 1, 3:06 AM MDT	Lake Wind Advisory	GGW	40 hr
Jun 4, 4:38 PM MDT	Severe Thunderstorm Warning	GGW	34 min
Jun 4, 5:56 PM MDT	Special Weather Statement	GGW	49 min
Jun 4, 6:14 PM MDT	Mesoscale Discussion	SPC	3 hr
Jun 4, 8:39 PM MDT	Special Weather Statement	GGW	66 min
Jun 7, 10:24 AM MDT	Mesoscale Discussion	SPC	66 min
Jun 7, 5:12 PM MDT	Special Weather Statement	GGW	48 min
Jun 7, 5:57 PM MDT	Special Weather Statement	GGW	48 min
Jun 7, 6:09 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 7, 6:15 PM MDT	Special Weather Statement	GGW	60 min
Jun 9, 1:58 PM MDT	Lake Wind Advisory	GGW	55 hr
Jun 12, 3:13 AM MDT	Lake Wind Advisory	GGW	17 hr
Jun 14, 3:08 AM MDT	Lake Wind Advisory	GGW	17 hr
Jun 15, 6:46 PM MDT	Lake Wind Advisory	GGW	25 hr
Jun 18, 3:12 AM MDT	Lake Wind Advisory	GGW	14 hr
Jun 21, 9:17 PM MDT	Special Weather Statement	GGW	58 min
Jun 22, 3:47 PM MDT	Areal Flood Advisory	GGW	3 hr
Jun 22, 5:29 PM MDT	Special Weather Statement	GGW	61 min
Jun 23, 5:01 PM MDT	Areal Flood Advisory	GGW	119 min
Jun 23, 5:13 PM MDT	Areal Flood Advisory	GGW	2 hr
Jun 28, 5:38 PM MDT	Special Weather Statement	GGW	52 min
Jun 28, 6:09 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Jul 1, 3:11 AM MDT	Lake Wind Advisory	GGW	16 hr
Jul 3, 2:49 PM MDT	Heat Advisory	GGW	3 days
Jul 3, 7:54 PM MDT	Severe Thunderstorm Warning	GGW	51 min
Jul 3, 8:06 PM MDT	Severe Thunderstorm Warning	GGW	54 min
Jul 3, 8:43 PM MDT	Severe Thunderstorm Warning	GGW	62 min
Jul 4, 3:29 AM MDT	Lake Wind Advisory	GGW	17 hr
Jul 5, 3:21 AM MDT	Lake Wind Advisory	GGW	18 hr
Jul 8, 12:46 AM MDT	Special Weather Statement	GGW	44 min
Jul 9, 2:28 PM MDT	Heat Advisory	GGW	30 hr
Jul 10, 1:50 PM MDT	Mesoscale Discussion	SPC	115 min
Jul 10, 2:14 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 10, 4:28 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 10, 4:57 PM MDT	Severe Thunderstorm Warning	GGW	63 min
Jul 10, 5:34 PM MDT	Severe Thunderstorm Warning	GGW	56 min
Jul 10, 5:48 PM MDT	Severe Thunderstorm Warning	GGW	27 min
Jul 10, 5:54 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Jul 10, 6:09 PM MDT	Severe Thunderstorm Warning	GGW	51 min
Jul 10, 6:28 PM MDT	Severe Thunderstorm Warning	GGW	47 min
Jul 10, 6:32 PM MDT	Mesoscale Discussion	SPC	118 min
Jul 10, 6:49 PM MDT	Severe Thunderstorm Warning	GGW	41 min
Jul 10, 7:11 PM MDT	Severe Thunderstorm Warning	GGW	64 min
Jul 11, 3:10 AM MDT	Lake Wind Advisory	GGW	14 hr
Jul 13, 2:19 PM MDT	Lake Wind Advisory	GGW	30 hr
Jul 16, 2:28 PM MDT	Fire Weather Watch	GGW	36 hr
Jul 18, 2:28 AM MDT	Red Flag Warning	GGW	19 hr
Jul 20, 3:11 AM MDT	Lake Wind Advisory	GGW	30 hr
Jul 20, 7:25 PM MDT	Special Weather Statement	GGW	65 min
Jul 21, 11:43 AM MDT	Special Weather Statement	GGW	47 min
Jul 21, 11:53 AM MDT	Mesoscale Discussion	SPC	3 hr
Jul 21, 12:04 PM MDT	Severe Thunderstorm Warning	GGW	56 min
Jul 21, 12:54 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Jul 21, 3:00 PM MDT	Lake Wind Advisory	GGW	29 hr
Jul 27, 5:55 PM MDT	Special Weather Statement	GGW	65 min
Aug 1, 11:26 AM MDT	Red Flag Warning	GGW	59 hr
Aug 4, 4:23 PM MDT	Special Weather Statement	GGW	52 min
Aug 4, 5:02 PM MDT	Special Weather Statement	GGW	58 min
Aug 4, 5:29 PM MDT	Special Weather Statement	GGW	76 min
Aug 5, 8:13 PM MDT	Areal Flood Advisory	GGW	107 min
Aug 8, 3:09 AM MDT	Heat Advisory	GGW	48 hr
Aug 8, 3:11 AM MDT	Fire Weather Watch	GGW	3 days
Aug 9, 3:01 AM MDT	Heat Advisory	GGW	18 hr
Aug 9, 2:46 PM MDT	Fire Weather Watch	GGW	48 hr
Aug 9, 3:07 PM MDT	Excessive Heat Warning	GGW	54 hr
Aug 10, 3:21 AM MDT	Red Flag Warning	GGW	18 hr
Aug 11, 3:31 AM MDT	Red Flag Warning	GGW	19 hr
Aug 11, 2:49 PM MDT	Red Flag Warning	GGW	30 hr
Aug 12, 3:30 AM MDT	Lake Wind Advisory	GGW	18 hr
Aug 18, 10:22 AM MDT	Dense Smoke Advisory	GGW	11 hr
Aug 29, 2:44 PM MDT	Lake Wind Advisory	GGW	27 hr
Aug 31, 3:07 PM MDT	Lake Wind Advisory	GGW	29 hr
Sep 2, 11:01 PM MDT	Lake Wind Advisory	GGW	28 hr
Sep 15, 2:34 AM MDT	Lake Wind Advisory	GGW	17 hr
Sep 17, 12:29 AM MDT	Special Weather Statement	GGW	61 min
Sep 17, 2:15 AM MDT	Special Weather Statement	GGW	60 min
Sep 25, 2:57 AM MDT	Lake Wind Advisory	GGW	16 hr
Sep 26, 2:51 AM MDT	Lake Wind Advisory	GGW	17 hr
Oct 2, 8:56 PM MDT	Winter Weather Advisory	GGW	14 hr
Oct 3, 9:31 PM MDT	Lake Wind Advisory	GGW	20 hr
Oct 4, 3:12 AM MDT	Winter Weather Advisory	GGW	30 hr
Oct 9, 3:18 AM MDT	Lake Wind Advisory	GGW	19 hr
Oct 12, 2:55 PM MDT	Lake Wind Advisory	GGW	29 hr
Oct 14, 2:53 PM MDT	Lake Wind Advisory	GGW	28 hr
Oct 23, 3:20 AM MDT	Lake Wind Advisory	GGW	14 hr
Oct 26, 2:07 PM MDT	Lake Wind Advisory	GGW	27 hr
Oct 31, 2:18 PM MDT	Lake Wind Advisory	GGW	29 hr
Nov 1, 2:29 PM MDT	Winter Storm Watch	GGW	13 hr
Nov 1, 2:29 PM MDT	Winter Weather Advisory	GGW	37 hr
Nov 2, 3:31 AM MDT	Winter Storm Warning	GGW	10 hr
Nov 4, 1:44 PM MST	Lake Wind Advisory	GGW	54 hr
Nov 8, 2:04 PM MST	Lake Wind Advisory	GGW	5 hr
Nov 9, 3:26 AM MST	Lake Wind Advisory	GGW	43 hr
Nov 15, 3:07 AM MST	Winter Weather Advisory	GGW	38 hr
Nov 29, 4:19 AM MST	Winter Storm Watch	GGW	24 hr
Nov 30, 4:09 AM MST	Winter Storm Warning	GGW	35 hr
Nov 30, 4:09 AM MST	Winter Weather Advisory	GGW	62 hr
Dec 2, 7:54 PM MST	Dense Fog Advisory	GGW	7 hr
Dec 29, 2:27 PM MST	Wind Chill Watch	GGW	13 hr
Dec 30, 3:30 AM MST	Wind Chill Advisory	GGW	33 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	23
Severe Thunderstorm Watch	3
Mesoscale Discussion	9
Special Weather Statement	32
Flooding
Areal Flood Warning	6
River Flood Warning	5
Flood Watch	1
Areal Flood Advisory	6
Winter
Winter Storm Warning	6
Winter Storm Watch	8
Winter Weather Advisory	22
Heat
Excessive Heat Warning	1
Heat Advisory	4
Cold
Wind Chill Warning	3
Wind Chill Watch	1
Wind Chill Advisory	18
Wind and dust
High Wind Watch	1
Lake Wind Advisory	35
Fire
Red Flag Warning	6
Fire Weather Watch	3
Fog and smoke
Dense Fog Advisory	11
Dense Smoke 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 2017 2019

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.