Weather alerts in Valley County, Montana, 2015

173 weather alerts in 2015, 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 2015. Tap one for its archive.

Alerts: 173
Warnings: 39
Watches: 15
Advisories: 91
Busiest month: July34 alerts
Busiest day: June 19, 20159 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, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	21	16	24%	12	58%	34 min
Flash flood warnings	0			0

Each office's whole area, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Glasgow, MT: tornado warnings	0			1	0%
NWS Glasgow, MT: severe thunderstorm warnings	65	39	40%	86	72%	24 min
NWS Glasgow, MT: flash flood warnings	3	0	100%	4	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 1, 2:53 AM MST	Winter Storm Watch	GGW	24 hr
Jan 2, 2:55 AM MST	Winter Weather Advisory	GGW	28 hr
Jan 3, 3:53 AM MST	Wind Chill Advisory	GGW	48 hr
Jan 3, 2:48 PM MST	Winter Weather Advisory	GGW	3 days
Jan 5, 2:44 PM MST	Wind Chill Advisory	GGW	46 hr
Jan 7, 2:04 PM MST	Winter Weather Advisory	GGW	15 hr
Jan 8, 3:21 AM MST	Wind Chill Advisory	GGW	32 hr
Jan 8, 5:11 AM MST	Blizzard Warning	GGW	7 hr
Jan 8, 8:25 AM MST	Winter Weather Advisory	GGW	8 hr
Jan 9, 2:24 PM MST	Wind Chill Advisory	GGW	18 hr
Jan 11, 2:18 PM MST	Wind Chill Advisory	GGW	20 hr
Jan 18, 8:53 AM MST	Freezing Rain Advisory	GGW	8 hr
Jan 30, 2:27 PM MST	Winter Weather Advisory	GGW	32 hr
Feb 2, 3:21 AM MST	Winter Weather Advisory	GGW	30 hr
Feb 3, 2:26 PM MST	Wind Chill Advisory	GGW	21 hr
Feb 4, 8:37 PM MST	Freezing Rain Advisory	GGW	25 hr
Feb 8, 5:36 PM MST	Areal Flood Advisory	GGW	24 hr
Feb 8, 9:03 PM MST	Dense Fog Advisory	GGW	32 hr
Feb 9, 3:11 AM MST	Freezing Rain Advisory	GGW	24 hr
Feb 10, 3:33 AM MST	Areal Flood Warning	GGW	24 hr
Feb 10, 8:02 AM MST	River Flood Warning	GGW	42 hr
Feb 16, 2:28 PM MST	Wind Chill Advisory	GGW	21 hr
Feb 20, 11:06 AM MST	Wind Chill Advisory	GGW	46 hr
Feb 25, 3:19 AM MST	Wind Chill Advisory	GGW	31 hr
Feb 26, 8:08 PM MST	Wind Chill Advisory	GGW	13 hr
Mar 2, 3:14 AM MST	Wind Chill Advisory	GGW	57 hr
Mar 14, 4:06 AM MDT	Red Flag Warning	GGW	16 hr
Mar 15, 2:35 PM MDT	Winter Weather Advisory	GGW	20 hr
Mar 17, 2:54 AM MDT	Winter Weather Advisory	GGW	36 hr
Mar 23, 3:27 AM MDT	Winter Weather Advisory	GGW	35 hr
Mar 27, 3:06 AM MDT	Fire Weather Watch	GGW	24 hr
Mar 27, 3:04 PM MDT	Lake Wind Advisory	GGW	36 hr
Mar 28, 3:26 AM MDT	Red Flag Warning	GGW	17 hr
Mar 30, 1:37 PM MDT	Red Flag Warning	GGW	55 hr
Mar 31, 9:14 AM MDT	Lake Wind Advisory	GGW	56 hr
Apr 4, 3:22 AM MDT	Winter Weather Advisory	GGW	34 hr
Apr 5, 3:29 AM MDT	Winter Storm Watch	GGW	10 hr
Apr 5, 1:58 PM MDT	Winter Weather Advisory	GGW	42 hr
Apr 11, 3:19 AM MDT	Lake Wind Advisory	GGW	41 hr
Apr 11, 3:30 AM MDT	Red Flag Warning	GGW	41 hr
Apr 13, 2:27 PM MDT	Lake Wind Advisory	GGW	54 hr
Apr 13, 2:36 PM MDT	Red Flag Warning	GGW	30 hr
Apr 17, 2:38 PM MDT	Lake Wind Advisory	GGW	33 hr
Apr 19, 3:13 AM MDT	Lake Wind Advisory	GGW	18 hr
Apr 25, 10:42 AM MDT	Lake Wind Advisory	GGW	7 hr
May 2, 3:06 AM MDT	Lake Wind Advisory	GGW	18 hr
May 3, 2:53 PM MDT	Lake Wind Advisory	GGW	30 hr
May 5, 3:11 AM MDT	Lake Wind Advisory	GGW	16 hr
May 6, 3:21 AM MDT	Lake Wind Advisory	GGW	18 hr
May 7, 3:18 AM MDT	Lake Wind Advisory	GGW	15 hr
May 13, 4:55 AM MDT	Lake Wind Advisory	GGW	22 hr
May 14, 2:42 PM MDT	Lake Wind Advisory	GGW	3 days
May 21, 2:21 PM MDT	Lake Wind Advisory	GGW	29 hr
May 23, 3:10 AM MDT	Lake Wind Advisory	GGW	18 hr
May 28, 12:59 PM MDT	Lake Wind Advisory	GGW	7 hr
May 29, 2:44 PM MDT	Lake Wind Advisory	GGW	29 hr
Jun 3, 7:29 PM MDT	Lake Wind Advisory	GGW	25 hr
Jun 5, 3:31 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 5, 4:02 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 5, 6:41 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 5, 8:42 PM MDT	Mesoscale Discussion	SPC	93 min
Jun 10, 3:10 AM MDT	Lake Wind Advisory	GGW	17 hr
Jun 11, 2:41 PM MDT	Lake Wind Advisory	GGW	24 hr
Jun 17, 3:21 AM MDT	Lake Wind Advisory	GGW	19 hr
Jun 17, 3:35 PM MDT	Special Weather Statement	GGW	40 min
Jun 17, 3:53 PM MDT	Special Weather Statement	GGW	37 min
Jun 17, 4:36 PM MDT	Special Weather Statement	GGW	54 min
Jun 19, 12:53 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 19, 1:03 PM MDT	Special Weather Statement	GGW	57 min
Jun 19, 1:38 PM MDT	Severe Thunderstorm Warning	GGW	52 min
Jun 19, 1:43 PM MDT	Severe Thunderstorm Warning	GGW	48 min
Jun 19, 2:01 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 19, 2:22 PM MDT	Severe Thunderstorm Warning	GGW	53 min
Jun 19, 4:47 PM MDT	Severe Thunderstorm Warning	GGW	58 min
Jun 19, 5:40 PM MDT	Special Weather Statement	GGW	65 min
Jun 19, 5:50 PM MDT	Severe Thunderstorm Warning	GGW	55 min
Jun 19, 6:40 PM MDT	Special Weather Statement	GGW	65 min
Jun 21, 1:28 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 28, 5:56 PM MDT	Special Weather Statement	GGW	64 min
Jun 28, 6:32 PM MDT	Special Weather Statement	GGW	58 min
Jun 29, 2:24 PM MDT	Fire Weather Watch	GGW	13 hr
Jun 29, 2:41 PM MDT	Lake Wind Advisory	GGW	32 hr
Jun 29, 8:12 PM MDT	Dense Smoke Advisory	GGW	16 hr
Jun 30, 3:27 AM MDT	Red Flag Warning	GGW	19 hr
Jun 30, 4:29 PM MDT	Tornado Watch	SPC	7 hr
Jun 30, 4:58 PM MDT	Severe Thunderstorm Warning	GGW	41 min
Jul 1, 1:43 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 1, 2:21 PM MDT	Special Weather Statement	GGW	54 min
Jul 1, 2:58 PM MDT	Special Weather Statement	GGW	62 min
Jul 1, 3:09 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Jul 1, 5:27 PM MDT	Special Weather Statement	GGW	63 min
Jul 1, 6:15 PM MDT	Special Weather Statement	GGW	60 min
Jul 4, 4:52 PM MDT	Lake Wind Advisory	GGW	4 hr
Jul 4, 9:34 PM MDT	Mesoscale Discussion	SPC	116 min
Jul 4, 9:54 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 11:57 PM MDT	Severe Thunderstorm Warning	GGW	63 min
Jul 5, 12:07 AM MDT	Severe Thunderstorm Warning	GGW	53 min
Jul 5, 12:51 AM MDT	Severe Thunderstorm Warning	GGW	54 min
Jul 5, 1:26 AM MDT	Severe Thunderstorm Warning	GGW	64 min
Jul 5, 2:28 AM MDT	Severe Thunderstorm Warning	GGW	62 min
Jul 5, 11:53 AM MDT	Lake Wind Advisory	GGW	8 hr
Jul 11, 8:21 PM MDT	Lake Wind Advisory	GGW	23 hr
Jul 15, 1:44 PM MDT	Mesoscale Discussion	SPC	61 min
Jul 16, 3:03 AM MDT	Lake Wind Advisory	GGW	65 hr
Jul 19, 3:44 AM MDT	Lake Wind Advisory	GGW	20 hr
Jul 22, 6:42 PM MDT	Lake Wind Advisory	GGW	3 hr
Jul 23, 2:37 PM MDT	Red Flag Warning	GGW	30 hr
Jul 27, 2:38 AM MDT	Severe Thunderstorm Warning	GGW	23 min
Jul 27, 3:40 AM MDT	High Wind Watch	GGW	11 hr
Jul 27, 3:40 AM MDT	Lake Wind Advisory	GGW	29 hr
Jul 27, 4:09 AM MDT	Flood Watch	GGW	53 hr
Jul 27, 2:25 PM MDT	High Wind Warning	GGW	30 hr
Jul 27, 2:58 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 27, 5:32 PM MDT	Mesoscale Discussion	SPC	118 min
Jul 27, 5:34 PM MDT	Severe Thunderstorm Warning	GGW	56 min
Jul 27, 6:24 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Jul 27, 7:07 PM MDT	Severe Thunderstorm Warning	GGW	53 min
Jul 27, 7:28 PM MDT	Severe Thunderstorm Warning	GGW	62 min
Jul 27, 7:44 PM MDT	Severe Thunderstorm Warning	GGW	61 min
Jul 27, 8:43 PM MDT	Severe Thunderstorm Warning	GGW	62 min
Aug 1, 3:14 AM MDT	Lake Wind Advisory	GGW	17 hr
Aug 4, 2:48 PM MDT	Special Weather Statement	GGW	57 min
Aug 6, 5:33 PM MDT	Special Weather Statement	GGW	57 min
Aug 12, 3:36 PM MDT	Special Weather Statement	GGW	39 min
Aug 12, 4:15 PM MDT	Special Weather Statement	GGW	60 min
Aug 12, 5:11 PM MDT	Special Weather Statement	GGW	49 min
Aug 13, 3:39 AM MDT	Fire Weather Watch	GGW	24 hr
Aug 14, 3:36 AM MDT	Red Flag Warning	GGW	41 hr
Aug 14, 2:52 PM MDT	Lake Wind Advisory	GGW	5 hr
Aug 14, 2:52 PM MDT	Lake Wind Advisory	GGW	30 hr
Aug 14, 10:49 PM MDT	Special Weather Statement	GGW	56 min
Aug 18, 1:48 PM MDT	Special Weather Statement	GGW	42 min
Aug 20, 3:02 PM MDT	Red Flag Warning	GGW	30 hr
Aug 21, 3:33 AM MDT	Lake Wind Advisory	GGW	41 hr
Aug 28, 1:00 PM MDT	Dense Smoke Advisory	GGW	48 hr
Aug 30, 7:23 PM MDT	Severe Thunderstorm Warning	GGW	37 min
Aug 30, 7:55 PM MDT	Severe Thunderstorm Warning	GGW	50 min
Sep 4, 3:27 AM MDT	Lake Wind Advisory	GGW	14 hr
Sep 4, 8:43 PM MDT	Lake Wind Advisory	GGW	7 hr
Sep 5, 2:54 PM MDT	Lake Wind Advisory	GGW	30 hr
Sep 21, 3:22 AM MDT	Lake Wind Advisory	GGW	15 hr
Sep 22, 3:40 AM MDT	Lake Wind Advisory	GGW	24 hr
Oct 2, 9:50 AM MDT	Lake Wind Advisory	GGW	23 hr
Oct 7, 3:07 AM MDT	Lake Wind Advisory	GGW	16 hr
Oct 9, 9:49 AM MDT	High Wind Watch	GGW	29 hr
Oct 10, 2:19 PM MDT	High Wind Warning	GGW	37 hr
Oct 10, 2:21 PM MDT	Red Flag Warning	GGW	30 hr
Oct 20, 2:56 AM MDT	Lake Wind Advisory	GGW	18 hr
Oct 25, 8:30 PM MDT	Lake Wind Advisory	GGW	27 hr
Oct 27, 2:44 AM MDT	Lake Wind Advisory	GGW	18 hr
Oct 30, 2:50 PM MDT	Lake Wind Advisory	GGW	16 hr
Oct 31, 2:42 PM MDT	Lake Wind Advisory	GGW	28 hr
Nov 3, 3:29 AM MST	Winter Weather Advisory	GGW	23 hr
Nov 3, 3:32 AM MST	Lake Wind Advisory	GGW	17 hr
Nov 9, 8:08 PM MST	Dense Fog Advisory	GGW	13 hr
Nov 11, 3:22 AM MST	Lake Wind Advisory	GGW	35 hr
Nov 15, 2:09 PM MST	Lake Wind Advisory	GGW	30 hr
Nov 16, 3:22 AM MST	High Wind Watch	GGW	24 hr
Nov 17, 3:07 AM MST	High Wind Warning	GGW	48 hr
Nov 18, 9:45 PM MST	Lake Wind Advisory	GGW	10 hr
Nov 24, 8:44 AM MST	Lake Wind Advisory	GGW	30 hr
Nov 30, 12:45 AM MST	Freezing Fog Advisory	GGW	11 hr
Dec 9, 3:30 AM MST	High Wind Warning	GGW	29 hr
Dec 10, 9:56 AM MST	Winter Weather Advisory	GGW	23 hr
Dec 11, 9:51 PM MST	Dense Fog Advisory	GGW	13 hr
Dec 12, 7:22 AM MST	Freezing Rain Advisory	GGW	3 hr
Dec 12, 2:26 PM MST	Winter Storm Watch	GGW	24 hr
Dec 12, 3:56 PM MST	Dense Fog Advisory	GGW	17 hr
Dec 13, 2:20 PM MST	Winter Storm Warning	GGW	42 hr
Dec 14, 3:07 AM MST	Winter Weather Advisory	GGW	35 hr
Dec 19, 2:44 AM MST	Winter Weather Advisory	GGW	11 hr
Dec 20, 8:26 AM MST	Dense Fog Advisory	GGW	24 hr
Dec 22, 2:24 PM MST	Winter Weather Advisory	GGW	20 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	21
Severe Thunderstorm Watch	4
Tornado Watch	1
Mesoscale Discussion	9
Special Weather Statement	19
Flooding
Areal Flood Warning	1
River Flood Warning	1
Flood Watch	1
Areal Flood Advisory	1
Winter
Blizzard Warning	1
Winter Storm Warning	1
Winter Storm Watch	3
Freezing Rain Advisory	4
Winter Weather Advisory	16
Cold
Wind Chill Advisory	11
Wind and dust
High Wind Warning	4
High Wind Watch	3
Lake Wind Advisory	51
Fire
Red Flag Warning	10
Fire Weather Watch	3
Fog and smoke
Dense Fog Advisory	5
Dense Smoke Advisory	2
Freezing 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 2014 2016

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.