Weather alerts in Valley County, Montana, 2008

174 weather alerts in 2008, 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 2008. Tap one for its archive.

Alerts: 174
Warnings: 59
Watches: 21
Advisories: 81
Busiest month: June37 alerts
Busiest day: June 26, 20087 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, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	36	8	78%	11	55%	21 min
Flash flood warnings	1	0	100%	0

Each office's whole area, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Glasgow, MT: tornado warnings	5	0	100%	0
NWS Glasgow, MT: severe thunderstorm warnings	168	69	59%	132	77%	23 min
NWS Glasgow, MT: flash flood warnings	3	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 12, 8:33 AM MST	Dense Fog Advisory	GGW	3 hr
Jan 13, 2:57 PM MST	High Wind Watch	GGW	37 hr
Jan 13, 11:42 PM MST	Dense Fog Advisory	GGW	10 hr
Jan 16, 3:31 AM MST	Winter Storm Watch	GGW	24 hr
Jan 17, 3:45 AM MST	Snow and Blowing Snow Advisory	GGW	15 hr
Jan 17, 6:30 PM MST	Wind Chill Advisory	GGW	18 hr
Jan 19, 3:00 AM MST	Wind Chill Advisory	GGW	33 hr
Jan 22, 2:26 PM MST	Winter Weather Advisory	GGW	13 hr
Jan 27, 3:56 PM MST	Winter Weather Advisory	GGW	26 hr
Jan 27, 9:07 PM MST	Wind Chill Watch	GGW	18 hr
Jan 28, 3:07 PM MST	Wind Chill Warning	GGW	24 hr
Jan 30, 9:03 AM MST	Wind Chill Advisory	GGW	4 hr
Jan 30, 9:03 PM MST	Wind Chill Advisory	GGW	7 hr
Feb 1, 3:28 AM MST	Wind Chill Advisory	GGW	6 hr
Feb 2, 10:54 PM MST	Dense Fog Advisory	GGW	10 hr
Feb 5, 4:26 AM MST	Wind Chill Advisory	GGW	5 hr
Feb 7, 2:47 PM MST	Wind Chill Watch	GGW	24 hr
Feb 8, 2:57 PM MST	Wind Chill Advisory	GGW	32 hr
Feb 8, 8:54 PM MST	Wind Chill Warning	GGW	14 hr
Feb 9, 2:59 PM MST	Wind Chill Warning	GGW	8 hr
Feb 10, 4:09 AM MST	Winter Weather Advisory	GGW	31 hr
Feb 12, 2:37 PM MST	Snow and Blowing Snow Advisory	GGW	24 hr
Feb 16, 12:47 AM MST	Freezing Rain Advisory	GGW	10 hr
Feb 19, 2:45 PM MST	Wind Chill Advisory	GGW	20 hr
Mar 21, 4:11 AM MDT	Dense Fog Advisory	GGW	6 hr
Mar 23, 3:48 AM MDT	High Wind Watch	GGW	24 hr
Mar 24, 3:39 AM MDT	High Wind Warning	GGW	14 hr
Mar 24, 3:43 AM MDT	Red Flag Warning	GGW	17 hr
Mar 27, 2:45 PM MDT	Snow Advisory	GGW	19 hr
Mar 28, 3:16 PM MDT	Snow and Blowing Snow Advisory	GGW	30 hr
Apr 3, 10:11 AM MDT	Red Flag Warning	GGW	9 hr
Apr 5, 4:16 AM MDT	Snow Advisory	GGW	20 hr
Apr 13, 2:51 PM MDT	Fire Weather Watch	GGW	13 hr
Apr 14, 3:44 AM MDT	Red Flag Warning	GGW	17 hr
Apr 19, 9:50 AM MDT	Red Flag Warning	GGW	11 hr
Apr 19, 9:54 AM MDT	Lake Wind Advisory	GGW	11 hr
Apr 20, 3:57 AM MDT	Lake Wind Advisory	GGW	35 hr
Apr 22, 3:07 AM MDT	Lake Wind Advisory	GGW	17 hr
Apr 22, 3:08 AM MDT	Red Flag Warning	GGW	18 hr
Apr 26, 3:58 AM MDT	Lake Wind Advisory	GGW	15 hr
Apr 28, 2:47 PM MDT	Fire Weather Watch	GGW	14 hr
Apr 29, 4:12 AM MDT	Lake Wind Advisory	GGW	40 hr
Apr 29, 4:25 AM MDT	Red Flag Warning	GGW	18 hr
Apr 29, 11:16 PM MDT	Severe Thunderstorm Warning	GGW	38 min
May 1, 3:53 AM MDT	Lake Wind Advisory	GGW	16 hr
May 14, 3:49 AM MDT	Lake Wind Advisory	GGW	16 hr
May 15, 2:54 PM MDT	Lake Wind Advisory	GGW	29 hr
May 15, 3:23 PM MDT	Fire Weather Watch	GGW	12 hr
May 16, 3:35 AM MDT	Red Flag Warning	GGW	16 hr
May 17, 2:44 PM MDT	Lake Wind Advisory	GGW	29 hr
May 18, 2:56 PM MDT	Fire Weather Watch	GGW	13 hr
May 19, 3:40 AM MDT	Red Flag Warning	GGW	16 hr
May 19, 3:44 AM MDT	Lake Wind Advisory	GGW	15 hr
May 20, 10:05 PM MDT	Lake Wind Advisory	GGW	4 days
May 31, 5:37 PM MDT	Severe Thunderstorm Warning	GGW	53 min
May 31, 10:01 PM MDT	Severe Thunderstorm Warning	GGW	59 min
Jun 6, 3:27 AM MDT	Lake Wind Advisory	GGW	14 hr
Jun 7, 3:53 AM MDT	Lake Wind Advisory	GGW	16 hr
Jun 8, 10:24 AM MDT	Lake Wind Advisory	GGW	9 hr
Jun 10, 9:36 AM MDT	Lake Wind Advisory	GGW	15 hr
Jun 10, 4:21 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 11, 10:52 PM MDT	River Flood Watch	GGW	59 hr
Jun 12, 3:53 AM MDT	Lake Wind Advisory	GGW	41 hr
Jun 12, 1:08 PM MDT	River Flood Watch	GGW	45 hr
Jun 12, 1:08 PM MDT	River Flood Watch	GGW	45 hr
Jun 13, 2:19 PM MDT	Severe Thunderstorm Warning	GGW	56 min
Jun 13, 2:34 PM MDT	Severe Thunderstorm Warning	GGW	56 min
Jun 13, 2:53 PM MDT	Severe Thunderstorm Warning	GGW	67 min
Jun 13, 3:33 PM MDT	Severe Thunderstorm Warning	GGW	42 min
Jun 13, 4:33 PM MDT	Mesoscale Discussion	SPC	87 min
Jun 14, 4:01 AM MDT	Lake Wind Advisory	GGW	17 hr
Jun 16, 10:54 PM MDT	Severe Thunderstorm Warning	GGW	54 min
Jun 17, 5:48 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 17, 10:52 PM MDT	Severe Thunderstorm Warning	GGW	38 min
Jun 17, 11:26 PM MDT	Severe Thunderstorm Warning	GGW	31 min
Jun 18, 12:47 AM MDT	Severe Thunderstorm Warning	GGW	43 min
Jun 21, 3:07 PM MDT	Lake Wind Advisory	GGW	25 hr
Jun 22, 4:11 PM MDT	Mesoscale Discussion	SPC	94 min
Jun 22, 5:47 PM MDT	Severe Thunderstorm Warning	GGW	58 min
Jun 22, 6:00 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 22, 7:18 PM MDT	Flash Flood Warning	GGW	6 hr
Jun 23, 4:13 PM MDT	Mesoscale Discussion	SPC	62 min
Jun 25, 5:54 PM MDT	Severe Thunderstorm Warning	GGW	54 min
Jun 25, 6:57 PM MDT	Severe Thunderstorm Warning	GGW	53 min
Jun 26, 5:53 AM MDT	Severe Thunderstorm Warning	GGW	67 min
Jun 26, 6:59 AM MDT	Severe Thunderstorm Warning	GGW	61 min
Jun 26, 9:12 AM MDT	Severe Thunderstorm Warning	GGW	63 min
Jun 26, 3:29 PM MDT	Severe Thunderstorm Warning	GGW	61 min
Jun 26, 4:51 PM MDT	Severe Thunderstorm Warning	GGW	54 min
Jun 26, 5:45 PM MDT	Severe Thunderstorm Warning	GGW	45 min
Jun 27, 3:28 AM MDT	Lake Wind Advisory	GGW	18 hr
Jun 30, 2:54 PM MDT	Lake Wind Advisory	GGW	29 hr
Jul 3, 2:47 PM MDT	Lake Wind Advisory	GGW	54 hr
Jul 4, 3:05 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 7:57 PM MDT	Severe Thunderstorm Warning	GGW	24 min
Jul 4, 8:08 PM MDT	Severe Thunderstorm Warning	GGW	37 min
Jul 4, 8:36 PM MDT	Mesoscale Discussion	SPC	54 min
Jul 7, 2:57 AM MDT	Lake Wind Advisory	GGW	18 hr
Jul 9, 3:00 PM MDT	Lake Wind Advisory	GGW	54 hr
Jul 12, 3:57 AM MDT	Lake Wind Advisory	GGW	14 hr
Jul 19, 6:25 AM MDT	Severe Thunderstorm Warning	GGW	53 min
Jul 22, 5:05 PM MDT	Mesoscale Discussion	SPC	55 min
Jul 22, 5:08 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 22, 7:59 PM MDT	Severe Thunderstorm Warning	GGW	61 min
Jul 22, 8:03 PM MDT	Mesoscale Discussion	SPC	87 min
Jul 22, 9:54 PM MDT	Mesoscale Discussion	SPC	96 min
Jul 24, 1:13 PM MDT	Mesoscale Discussion	SPC	92 min
Jul 24, 1:21 PM MDT	Severe Thunderstorm Warning	GGW	39 min
Jul 24, 2:00 PM MDT	Severe Thunderstorm Warning	GGW	60 min
Jul 24, 3:42 PM MDT	Severe Thunderstorm Warning	GGW	32 min
Jul 24, 4:26 PM MDT	Severe Thunderstorm Warning	GGW	49 min
Jul 26, 2:41 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 26, 5:48 PM MDT	Mesoscale Discussion	SPC	117 min
Jul 26, 6:29 PM MDT	Severe Thunderstorm Warning	GGW	61 min
Jul 26, 6:41 PM MDT	Severe Thunderstorm Warning	GGW	64 min
Jul 27, 2:07 AM MDT	Severe Thunderstorm Warning	GGW	25 min
Jul 27, 6:50 AM MDT	Mesoscale Discussion	SPC	85 min
Jul 28, 2:02 AM MDT	Mesoscale Discussion	SPC	88 min
Jul 28, 3:04 AM MDT	Severe Thunderstorm Warning	GGW	56 min
Aug 9, 6:38 PM MDT	Severe Thunderstorm Warning	GGW	67 min
Aug 10, 3:55 PM MDT	Severe Thunderstorm Warning	GGW	65 min
Aug 10, 9:26 PM MDT	Severe Thunderstorm Warning	GGW	64 min
Aug 11, 12:45 AM MDT	Severe Thunderstorm Warning	GGW	39 min
Aug 11, 2:54 AM MDT	Lake Wind Advisory	GGW	12 hr
Aug 19, 3:28 AM MDT	Red Flag Warning	GGW	18 hr
Aug 21, 2:48 PM MDT	Lake Wind Advisory	GGW	29 hr
Aug 25, 3:55 AM MDT	Red Flag Warning	GGW	20 hr
Aug 25, 3:57 AM MDT	Lake Wind Advisory	GGW	41 hr
Aug 27, 3:11 AM MDT	Lake Wind Advisory	GGW	17 hr
Aug 30, 3:06 PM MDT	Lake Wind Advisory	GGW	47 hr
Sep 12, 2:42 PM MDT	Lake Wind Advisory	GGW	24 hr
Sep 20, 3:17 AM MDT	Lake Wind Advisory	GGW	24 hr
Sep 22, 2:49 PM MDT	Lake Wind Advisory	GGW	28 hr
Oct 2, 3:03 PM MDT	Lake Wind Advisory	GGW	54 hr
Oct 6, 3:19 AM MDT	Lake Wind Advisory	GGW	16 hr
Oct 7, 2:32 PM MDT	Lake Wind Advisory	GGW	28 hr
Oct 9, 2:53 PM MDT	Winter Storm Watch	GGW	24 hr
Oct 10, 3:22 PM MDT	Winter Storm Warning	GGW	60 hr
Oct 14, 11:10 AM MDT	Lake Wind Advisory	GGW	7 hr
Oct 19, 2:51 PM MDT	Lake Wind Advisory	GGW	30 hr
Oct 21, 3:33 AM MDT	Lake Wind Advisory	GGW	14 hr
Oct 24, 2:22 PM MDT	Lake Wind Advisory	GGW	30 hr
Oct 25, 3:34 AM MDT	High Wind Warning	GGW	11 hr
Oct 25, 9:27 PM MDT	Lake Wind Advisory	GGW	22 hr
Nov 3, 3:33 AM MST	Lake Wind Advisory	GGW	13 hr
Nov 4, 2:47 PM MST	Winter Weather Advisory	GGW	43 hr
Nov 9, 10:51 PM MST	Freezing Rain Advisory	GGW	7 hr
Nov 13, 3:12 AM MST	Lake Wind Advisory	GGW	38 hr
Nov 14, 1:17 PM MST	Mesoscale Discussion	SPC	58 min
Nov 30, 9:31 AM MST	Lake Wind Advisory	GGW	7 hr
Dec 1, 2:53 PM MST	Lake Wind Advisory	GGW	29 hr
Dec 3, 3:22 AM MST	Lake Wind Advisory	GGW	14 hr
Dec 5, 4:57 AM MST	Lake Wind Advisory	GGW	14 hr
Dec 6, 6:46 PM MST	Freezing Rain Advisory	GGW	4 hr
Dec 7, 4:09 AM MST	Winter Weather Advisory	GGW	32 hr
Dec 7, 5:40 AM MST	Freezing Rain Advisory	GGW	5 hr
Dec 11, 2:26 PM MST	Lake Wind Advisory	GGW	2 hr
Dec 11, 2:37 PM MST	Blizzard Watch	GGW	24 hr
Dec 12, 2:50 PM MST	Blizzard Warning	GGW	37 hr
Dec 13, 3:41 PM MST	Wind Chill Warning	GGW	42 hr
Dec 17, 2:28 PM MST	Wind Chill Advisory	GGW	25 hr
Dec 18, 4:09 AM MST	Wind Chill Advisory	GGW	11 hr
Dec 18, 3:07 PM MST	Wind Chill Warning	GGW	67 hr
Dec 18, 3:07 PM MST	Winter Weather Advisory	GGW	31 hr
Dec 20, 9:28 PM MST	Wind Chill Advisory	GGW	9 hr
Dec 21, 3:06 PM MST	Wind Chill Warning	GGW	19 hr
Dec 21, 3:06 PM MST	Winter Weather Advisory	GGW	48 hr
Dec 22, 2:30 PM MST	Wind Chill Warning	GGW	7 hr
Dec 22, 9:49 PM MST	Wind Chill Advisory	GGW	13 hr
Dec 28, 3:15 PM MST	Winter Storm Watch	GGW	12 hr
Dec 28, 3:15 PM MST	Winter Weather Advisory	GGW	3 hr
Dec 28, 3:15 PM MST	Freezing Rain Advisory	GGW	3 hr
Dec 29, 3:29 AM MST	Winter Storm Warning	GGW	30 hr
Dec 29, 5:46 PM MST	Mesoscale Discussion	SPC	4 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	36
Severe Thunderstorm Watch	6
Mesoscale Discussion	13
Flooding
Flash Flood Warning	1
River Flood Watch	3
Winter
Blizzard Warning	1
Winter Storm Warning	2
Blizzard Watch	1
Winter Storm Watch	3
Freezing Rain Advisory	5
Snow Advisory	2
Snow and Blowing Snow Advisory	3
Winter Weather Advisory	8
Cold
Wind Chill Warning	7
Wind Chill Watch	2
Wind Chill Advisory	12
Wind and dust
High Wind Warning	2
High Wind Watch	2
Lake Wind Advisory	47
Fire
Red Flag Warning	10
Fire Weather Watch	4
Fog and smoke
Dense Fog 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 2007 2009

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.