Weather alerts in Valley County, Montana, 2017

184 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts: 184
Warnings: 51
Watches: 15
Advisories: 93
Busiest month: July43 alerts
Busiest day: July 10, 20176 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, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	12	5	58%	13	54%	35 min
Flash flood warnings	0			0

Each office's whole area, 2017

	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	42	12	71%	43	42%	22 min
NWS Glasgow, MT: flash flood warnings	1	0	100%	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, 11:30 AM MST	Wind Chill Advisory	GGW	71 hr
Jan 7, 2:31 PM MST	Winter Storm Watch	GGW	267 days
Jan 7, 6:39 PM MST	Wind Chill Advisory	GGW	5 hr
Jan 8, 2:21 PM MST	Winter Weather Advisory	GGW	29 hr
Jan 9, 2:43 PM MST	Wind Chill Advisory	GGW	21 hr
Jan 10, 2:50 AM MST	Wind Chill Advisory	GGW	57 hr
Jan 11, 3:16 AM MST	Wind Chill Warning	GGW	8 hr
Jan 11, 3:16 AM MST	Wind Chill Advisory	GGW	33 hr
Jan 12, 2:14 PM MST	Wind Chill Advisory	GGW	19 hr
Jan 26, 3:14 AM MST	Dense Fog Advisory	GGW	7 hr
Feb 5, 3:25 AM MST	Winter Weather Advisory	GGW	48 hr
Feb 7, 2:05 PM MST	Wind Chill Advisory	GGW	23 hr
Feb 8, 2:50 AM MST	Wind Chill Warning	GGW	6 hr
Feb 8, 1:25 PM MST	Wind Chill Advisory	GGW	21 hr
Feb 8, 1:25 PM MST	Winter Weather Advisory	GGW	31 hr
Feb 10, 8:57 PM MST	High Wind Warning	GGW	20 hr
Feb 19, 3:26 AM MST	Flood Watch	GGW	8 days
Feb 19, 5:47 PM MST	Dense Fog Advisory	GGW	13 hr
Feb 20, 8:23 PM MST	Areal Flood Warning	GGW	24 hr
Feb 21, 8:16 PM MST	Areal Flood Warning	GGW	3 hr
Feb 21, 10:21 PM MST	Areal Flood Warning	GGW	48 hr
Mar 5, 2:50 AM MST	Winter Weather Advisory	GGW	35 hr
Mar 8, 3:30 AM MST	Winter Storm Watch	GGW	24 hr
Mar 9, 3:50 AM MST	Winter Weather Advisory	GGW	47 hr
Mar 11, 8:56 AM MST	Winter Weather Advisory	GGW	26 hr
Mar 14, 2:59 AM MDT	Freezing Rain Advisory	GGW	24 hr
Mar 16, 8:44 PM MDT	Areal Flood Advisory	GGW	24 hr
Mar 18, 7:28 PM MDT	Areal Flood Advisory	GGW	48 hr
Mar 19, 5:11 AM MDT	Areal Flood Warning	GGW	48 hr
Mar 19, 10:40 AM MDT	River Flood Watch	GGW	64 hr
Mar 19, 10:00 PM MDT	River Flood Warning	GGW	55 hr
Mar 31, 7:22 AM MDT	Dense Fog Advisory	GGW	4 hr
Apr 12, 2:56 PM MDT	Lake Wind Advisory	GGW	54 hr
Apr 15, 3:03 AM MDT	Lake Wind Advisory	GGW	18 hr
Apr 22, 2:52 PM MDT	Lake Wind Advisory	GGW	31 hr
Apr 23, 9:34 AM MDT	Winter Weather Advisory	GGW	21 hr
Apr 29, 5:25 PM MDT	Special Weather Statement	GGW	35 min
May 1, 3:02 AM MDT	Lake Wind Advisory	GGW	17 hr
May 7, 3:14 AM MDT	Lake Wind Advisory	GGW	24 hr
May 12, 3:24 AM MDT	Lake Wind Advisory	GGW	63 hr
May 16, 2:37 PM MDT	Lake Wind Advisory	GGW	30 hr
May 21, 2:32 PM MDT	Lake Wind Advisory	GGW	7 hr
May 21, 3:27 PM MDT	Special Weather Statement	GGW	63 min
May 21, 4:07 PM MDT	Special Weather Statement	GGW	53 min
May 23, 1:18 PM MDT	Red Flag Warning	GGW	31 hr
May 23, 2:34 PM MDT	High Wind Warning	GGW	30 hr
May 24, 6:41 PM MDT	Lake Wind Advisory	GGW	26 hr
May 27, 2:52 AM MDT	Lake Wind Advisory	GGW	19 hr
May 28, 2:45 AM MDT	Lake Wind Advisory	GGW	18 hr
May 28, 2:48 AM MDT	Red Flag Warning	GGW	18 hr
Jun 1, 9:43 PM MDT	Special Weather Statement	GGW	32 min
Jun 2, 2:56 AM MDT	Lake Wind Advisory	GGW	17 hr
Jun 4, 3:08 PM MDT	Lake Wind Advisory	GGW	30 hr
Jun 7, 2:32 PM MDT	Lake Wind Advisory	GGW	50 hr
Jun 10, 3:04 AM MDT	Lake Wind Advisory	GGW	15 hr
Jun 11, 7:35 AM MDT	Lake Wind Advisory	GGW	8 hr
Jun 12, 3:21 AM MDT	Lake Wind Advisory	GGW	32 hr
Jun 13, 4:58 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 13, 5:22 PM MDT	Special Weather Statement	GGW	53 min
Jun 14, 2:32 AM MDT	Lake Wind Advisory	GGW	18 hr
Jun 15, 2:27 AM MDT	Lake Wind Advisory	GGW	18 hr
Jun 16, 2:40 AM MDT	Lake Wind Advisory	GGW	18 hr
Jun 16, 7:39 PM MDT	Special Weather Statement	GGW	51 min
Jun 17, 3:08 AM MDT	Lake Wind Advisory	GGW	18 hr
Jun 20, 2:15 PM MDT	Lake Wind Advisory	GGW	28 hr
Jun 22, 3:10 AM MDT	Lake Wind Advisory	GGW	19 hr
Jun 22, 2:22 PM MDT	High Wind Warning	GGW	3 hr
Jun 22, 9:58 PM MDT	Lake Wind Advisory	GGW	23 hr
Jun 24, 2:12 PM MDT	Fire Weather Watch	GGW	24 hr
Jun 25, 2:12 PM MDT	Red Flag Warning	GGW	31 hr
Jun 25, 2:35 PM MDT	Lake Wind Advisory	GGW	54 hr
Jun 26, 9:07 PM MDT	Special Weather Statement	GGW	53 min
Jun 28, 12:41 PM MDT	Special Weather Statement	GGW	34 min
Jun 28, 1:18 PM MDT	Special Weather Statement	GGW	42 min
Jun 28, 1:57 PM MDT	Lake Wind Advisory	GGW	31 hr
Jul 4, 7:04 PM MDT	Red Flag Warning	GGW	25 hr
Jul 5, 3:00 PM MDT	Lake Wind Advisory	GGW	5 hr
Jul 7, 8:56 AM MDT	Red Flag Warning	GGW	38 hr
Jul 7, 10:38 AM MDT	Heat Advisory	GGW	31 hr
Jul 9, 3:03 PM MDT	Fire Weather Watch	GGW	12 hr
Jul 10, 3:20 AM MDT	Red Flag Warning	GGW	18 hr
Jul 10, 4:13 PM MDT	Severe Thunderstorm Warning	GGW	32 min
Jul 10, 4:43 PM MDT	Severe Thunderstorm Warning	GGW	47 min
Jul 10, 4:47 PM MDT	Mesoscale Discussion	SPC	88 min
Jul 10, 5:32 PM MDT	Severe Thunderstorm Warning	GGW	28 min
Jul 10, 5:56 PM MDT	Severe Thunderstorm Warning	GGW	42 min
Jul 10, 6:04 PM MDT	Special Weather Statement	GGW	41 min
Jul 11, 4:38 AM MDT	Special Weather Statement	GGW	52 min
Jul 11, 5:03 PM MDT	Severe Thunderstorm Warning	GGW	57 min
Jul 11, 5:26 PM MDT	Special Weather Statement	GGW	64 min
Jul 11, 5:38 PM MDT	Severe Thunderstorm Warning	GGW	67 min
Jul 11, 6:04 PM MDT	Special Weather Statement	GGW	41 min
Jul 11, 6:22 PM MDT	Severe Thunderstorm Warning	GGW	53 min
Jul 13, 3:04 PM MDT	Red Flag Warning	GGW	30 hr
Jul 13, 3:04 PM MDT	Red Flag Warning	GGW	3 days
Jul 13, 3:04 PM MDT	Heat Advisory	GGW	30 hr
Jul 14, 2:41 PM MDT	Heat Advisory	GGW	54 hr
Jul 14, 2:41 PM MDT	Lake Wind Advisory	GGW	31 hr
Jul 14, 2:43 PM MDT	Fire Weather Watch	GGW	24 hr
Jul 15, 9:57 PM MDT	Special Weather Statement	GGW	63 min
Jul 15, 10:54 PM MDT	Special Weather Statement	GGW	66 min
Jul 15, 11:37 PM MDT	Special Weather Statement	GGW	53 min
Jul 16, 5:03 PM MDT	Severe Thunderstorm Warning	GGW	27 min
Jul 16, 5:26 PM MDT	Severe Thunderstorm Warning	GGW	49 min
Jul 16, 5:37 PM MDT	Special Weather Statement	GGW	38 min
Jul 16, 6:30 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 19, 1:36 AM MDT	Mesoscale Discussion	SPC	114 min
Jul 19, 2:02 PM MDT	Fire Weather Watch	GGW	13 hr
Jul 20, 3:18 AM MDT	Red Flag Warning	GGW	42 hr
Jul 20, 8:35 AM MDT	Special Weather Statement	GGW	55 min
Jul 20, 2:39 PM MDT	Red Flag Warning	GGW	54 hr
Jul 20, 2:40 PM MDT	Lake Wind Advisory	GGW	13 hr
Jul 20, 10:06 PM MDT	Lake Wind Advisory	GGW	23 hr
Jul 22, 9:09 PM MDT	Red Flag Warning	GGW	58 hr
Jul 23, 3:09 AM MDT	Fire Weather Watch	GGW	11 hr
Jul 23, 2:22 PM MDT	Lake Wind Advisory	GGW	30 hr
Jul 23, 2:28 PM MDT	Red Flag Warning	GGW	31 hr
Jul 27, 9:17 AM MDT	Lake Wind Advisory	GGW	6 hr
Aug 1, 2:14 PM MDT	Lake Wind Advisory	GGW	27 hr
Aug 4, 10:37 PM MDT	Lake Wind Advisory	GGW	23 hr
Aug 16, 3:05 AM MDT	Fire Weather Watch	GGW	11 hr
Aug 16, 2:14 PM MDT	Red Flag Warning	GGW	31 hr
Aug 18, 2:49 PM MDT	Red Flag Warning	GGW	28 hr
Aug 19, 9:08 AM MDT	Lake Wind Advisory	GGW	10 hr
Aug 24, 7:38 PM MDT	Special Weather Statement	GGW	52 min
Aug 24, 7:46 PM MDT	Special Weather Statement	GGW	29 min
Aug 24, 8:13 PM MDT	Special Weather Statement	GGW	47 min
Aug 24, 8:26 PM MDT	Severe Thunderstorm Warning	GGW	34 min
Aug 24, 8:52 PM MDT	Severe Thunderstorm Warning	GGW	53 min
Aug 24, 9:40 PM MDT	Severe Thunderstorm Warning	GGW	65 min
Aug 29, 2:52 PM MDT	Fire Weather Watch	GGW	37 hr
Aug 29, 3:22 PM MDT	Lake Wind Advisory	GGW	36 hr
Aug 30, 3:44 AM MDT	Red Flag Warning	GGW	41 hr
Sep 1, 3:09 PM MDT	Fire Weather Watch	GGW	24 hr
Sep 2, 2:52 PM MDT	Red Flag Warning	GGW	54 hr
Sep 2, 3:02 PM MDT	Lake Wind Advisory	GGW	30 hr
Sep 4, 2:53 AM MDT	Lake Wind Advisory	GGW	18 hr
Sep 7, 2:24 PM MDT	Red Flag Warning	GGW	29 hr
Sep 12, 3:49 PM MDT	Dense Smoke Advisory	GGW	12 hr
Sep 15, 2:44 AM MDT	Lake Wind Advisory	GGW	17 hr
Sep 16, 9:57 PM MDT	Dense Fog Advisory	GGW	11 hr
Sep 19, 2:37 PM MDT	Lake Wind Advisory	GGW	7 hr
Sep 20, 2:59 AM MDT	Lake Wind Advisory	GGW	16 hr
Sep 28, 2:15 PM MDT	Lake Wind Advisory	GGW	31 hr
Sep 30, 8:20 PM MDT	Lake Wind Advisory	GGW	69 hr
Oct 6, 12:22 PM MDT	Lake Wind Advisory	GGW	31 hr
Oct 7, 9:06 PM MDT	Lake Wind Advisory	GGW	24 hr
Oct 11, 8:57 AM MDT	Lake Wind Advisory	GGW	18 hr
Oct 15, 2:37 PM MDT	Lake Wind Advisory	GGW	64 hr
Oct 16, 3:09 PM MDT	Red Flag Warning	GGW	30 hr
Oct 17, 3:04 AM MDT	High Wind Warning	GGW	24 hr
Oct 18, 9:34 AM MDT	Red Flag Warning	GGW	8 hr
Oct 19, 1:17 PM MDT	Red Flag Warning	GGW	8 hr
Oct 19, 1:37 PM MDT	Lake Wind Advisory	GGW	68 hr
Oct 21, 1:41 PM MDT	High Wind Warning	GGW	32 hr
Oct 21, 5:45 PM MDT	Lake Wind Advisory	GGW	51 hr
Oct 23, 3:00 PM MDT	Fire Weather Watch	GGW	24 hr
Oct 24, 2:49 PM MDT	Red Flag Warning	GGW	32 hr
Oct 24, 3:18 PM MDT	Lake Wind Advisory	GGW	47 hr
Oct 28, 2:24 AM MDT	Lake Wind Advisory	GGW	49 hr
Nov 1, 12:40 PM MDT	Lake Wind Advisory	GGW	7 hr
Nov 2, 2:53 AM MDT	Winter Storm Watch	GGW	12 hr
Nov 2, 2:41 PM MDT	Winter Weather Advisory	GGW	45 hr
Nov 8, 2:32 PM MST	Lake Wind Advisory	GGW	37 hr
Nov 11, 2:50 PM MST	Dense Fog Advisory	GGW	20 hr
Nov 12, 5:25 PM MST	Dense Fog Advisory	GGW	18 hr
Nov 13, 2:29 PM MST	Lake Wind Advisory	GGW	27 hr
Nov 16, 3:18 AM MST	Lake Wind Advisory	GGW	11 hr
Nov 19, 8:34 PM MST	Lake Wind Advisory	GGW	25 hr
Nov 23, 3:22 AM MST	Lake Wind Advisory	GGW	38 hr
Nov 23, 4:52 PM MST	Red Flag Warning	GGW	5 hr
Nov 26, 10:29 PM MST	Lake Wind Advisory	GGW	28 hr
Dec 12, 9:45 AM MST	Red Flag Warning	GGW	12 hr
Dec 18, 2:59 AM MST	Winter Storm Watch	GGW	12 hr
Dec 18, 2:35 PM MST	Winter Storm Warning	GGW	50 hr
Dec 18, 2:35 PM MST	Winter Weather Advisory	GGW	55 hr
Dec 24, 3:02 AM MST	Wind Chill Advisory	GGW	3 days
Dec 25, 3:02 AM MST	Wind Chill Warning	GGW	8 hr
Dec 25, 3:02 AM MST	Wind Chill Advisory	GGW	57 hr
Dec 26, 8:35 PM MST	Wind Chill Warning	GGW	11 hr
Dec 27, 1:22 PM MST	Wind Chill Advisory	GGW	20 hr
Dec 28, 3:55 AM MST	Winter Weather Advisory	GGW	61 hr
Dec 28, 9:49 AM MST	Wind Chill Advisory	GGW	31 hr
Dec 29, 3:01 AM MST	Wind Chill Warning	GGW	3 days

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	12
Mesoscale Discussion	4
Special Weather Statement	21
Flooding
Areal Flood Warning	4
River Flood Warning	1
Flood Watch	1
River Flood Watch	1
Areal Flood Advisory	2
Winter
Winter Storm Warning	1
Winter Storm Watch	4
Freezing Rain Advisory	1
Winter Weather Advisory	10
Heat
Heat Advisory	3
Cold
Wind Chill Warning	5
Wind Chill Advisory	12
Wind and dust
High Wind Warning	5
Lake Wind Advisory	58
Fire
Red Flag Warning	23
Fire Weather Watch	9
Fog and smoke
Dense Fog Advisory	6
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 2016 2018

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.