Weather alerts in Dawson County, Montana, 2011

186 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Dawson County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts: 186
Warnings: 67
Watches: 34
Advisories: 46
Busiest month: July50 alerts
Busiest day: July 22, 201110 alerts

Over time

By month

Warning verification

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

1 of 1 tornado warnings covering Dawson County in 2011 had a tornado report inside them.

Dawson County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	1	0%	0
Severe thunderstorm warnings	23	15	35%	12	75%	15 min
Flash flood warnings	7	2	71%	0

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Glasgow, MT: tornado warnings	12	3	75%	2	100%	22 min
NWS Glasgow, MT: severe thunderstorm warnings	173	81	53%	170	78%	27 min
NWS Glasgow, MT: flash flood warnings	29	10	66%	25	72%	93 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
Dec 31, 9:20 PM MST	Wind Chill Advisory	GGW	16 hr
Jan 1, 2:51 PM MST	Wind Chill Advisory	GGW	13 hr
Jan 2, 11:13 AM MST	Winter Weather Advisory	GGW	17 hr
Jan 6, 3:05 PM MST	Winter Storm Watch	GGW	24 hr
Jan 7, 3:20 PM MST	Winter Weather Advisory	GGW	43 hr
Jan 9, 3:00 PM MST	Wind Chill Advisory	GGW	19 hr
Jan 10, 3:13 PM MST	Wind Chill Advisory	GGW	18 hr
Jan 14, 3:49 AM MST	Winter Weather Advisory	GGW	24 hr
Jan 16, 3:17 AM MST	Freezing Rain Advisory	GGW	23 hr
Jan 17, 7:24 PM MST	Winter Weather Advisory	GGW	17 hr
Jan 19, 3:04 PM MST	Wind Chill Advisory	GGW	12 hr
Jan 19, 9:00 PM MST	Winter Weather Advisory	GGW	6 hr
Jan 20, 3:07 PM MST	Winter Storm Watch	GGW	13 hr
Jan 21, 3:56 AM MST	Winter Weather Advisory	GGW	32 hr
Jan 22, 7:40 AM MST	Blizzard Warning	GGW	4 hr
Jan 22, 10:06 AM MST	Winter Weather Advisory	GGW	3 hr
Jan 22, 2:56 PM MST	Winter Weather Advisory	GGW	42 hr
Jan 29, 12:33 AM MST	Winter Weather Advisory	GGW	6 hr
Jan 29, 9:26 AM MST	Winter Weather Advisory	GGW	36 hr
Jan 30, 2:32 PM MST	Wind Chill Advisory	GGW	44 hr
Jan 31, 2:53 PM MST	Wind Chill Warning	GGW	20 hr
Feb 1, 11:11 AM MST	Wind Chill Advisory	GGW	24 hr
Feb 1, 8:50 PM MST	Wind Chill Warning	GGW	14 hr
Feb 2, 10:57 AM MST	Wind Chill Advisory	GGW	2 hr
Feb 4, 2:30 PM MST	Winter Weather Advisory	GGW	29 hr
Feb 6, 3:21 PM MST	Wind Chill Advisory	GGW	43 hr
Feb 7, 2:57 PM MST	Wind Chill Warning	GGW	19 hr
Feb 8, 2:28 PM MST	Wind Chill Advisory	GGW	20 hr
Feb 10, 3:26 AM MST	Winter Weather Advisory	GGW	31 hr
Feb 11, 2:56 PM MST	High Wind Warning	GGW	47 hr
Feb 12, 3:00 PM MST	High Wind Watch	GGW	12 hr
Feb 13, 2:01 PM MST	High Wind Warning	GGW	4 hr
Feb 15, 2:22 PM MST	Winter Storm Watch	GGW	25 hr
Feb 16, 3:16 PM MST	Winter Weather Advisory	GGW	23 hr
Feb 17, 5:10 AM MST	Winter Storm Warning	GGW	14 hr
Feb 17, 5:47 PM MST	Wind Chill Advisory	GGW	17 hr
Feb 18, 2:29 PM MST	Winter Storm Watch	GGW	24 hr
Feb 19, 2:30 PM MST	Winter Storm Warning	GGW	27 hr
Feb 20, 3:19 PM MST	Wind Chill Advisory	GGW	6 hr
Feb 23, 3:23 AM MST	Wind Chill Advisory	GGW	57 hr
Feb 25, 2:31 PM MST	Wind Chill Advisory	GGW	22 hr
Feb 26, 3:39 AM MST	Wind Chill Warning	GGW	7 hr
Feb 28, 2:53 PM MST	Winter Weather Advisory	GGW	20 hr
Mar 1, 11:00 AM MST	Wind Chill Advisory	GGW	27 hr
Mar 5, 2:24 PM MST	Winter Weather Advisory	GGW	13 hr
Mar 14, 4:34 AM MDT	Flood Watch	GGW	3 days
Mar 14, 6:54 AM MDT	River Flood Warning	GGW	53 hr
Mar 15, 2:36 AM MDT	River Flood Warning	GGW	68 hr
Mar 16, 11:54 AM MDT	Areal Flood Warning	GGW	72 hr
Mar 17, 10:45 AM MDT	Areal Flood Warning	GGW	54 hr
Mar 19, 12:31 PM MDT	Areal Flood Warning	GGW	49 hr
Mar 21, 3:50 PM MDT	Winter Weather Advisory	GGW	46 hr
Apr 1, 3:50 AM MDT	Winter Storm Watch	GGW	24 hr
Apr 14, 4:12 AM MDT	Winter Weather Advisory	GGW	17 hr
Apr 17, 3:09 PM MDT	Winter Storm Watch	GGW	24 hr
Apr 18, 3:03 PM MDT	Winter Weather Advisory	GGW	29 hr
Apr 22, 4:07 AM MDT	Winter Weather Advisory	GGW	11 hr
Apr 29, 3:16 PM MDT	Blizzard Warning	GGW	12 hr
Apr 30, 3:30 AM MDT	Winter Weather Advisory	GGW	3 hr
Apr 30, 6:32 AM MDT	Blizzard Warning	GGW	11 hr
May 9, 8:39 PM MDT	Flood Watch	GGW	23 hr
May 9, 10:55 PM MDT	Areal Flood Advisory	GGW	6 hr
May 10, 5:30 AM MDT	Areal Flood Advisory	GGW	18 hr
May 10, 8:31 AM MDT	Areal Flood Advisory	GGW	23 hr
May 10, 12:04 PM MDT	Areal Flood Warning	GGW	12 hr
May 17, 11:53 AM MDT	Areal Flood Warning	GGW	48 hr
May 18, 2:47 PM MDT	Flood Watch	GGW	44 hr
May 20, 10:06 AM MDT	Areal Flood Warning	GGW	67 hr
May 21, 8:21 AM MDT	River Flood Warning	GGW	6 days
May 23, 4:29 AM MDT	Areal Flood Warning	GGW	3 days
May 27, 3:24 AM MDT	Flood Watch	GGW	4 days
May 28, 10:54 AM MDT	River Flood Warning	GGW	63 hr
May 30, 12:55 AM MDT	Areal Flood Warning	GGW	36 hr
May 30, 2:51 AM MDT	High Wind Watch	GGW	18 hr
May 31, 12:40 PM MDT	River Flood Warning	GGW	18 hr
Jun 2, 1:54 PM MDT	Mesoscale Discussion	SPC	66 min
Jun 2, 2:09 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 2, 4:28 PM MDT	Special Weather Statement	GGW	32 min
Jun 2, 4:37 PM MDT	Mesoscale Discussion	SPC	83 min
Jun 2, 4:46 PM MDT	Severe Thunderstorm Warning	GGW	24 min
Jun 6, 10:25 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 12, 9:44 AM MDT	Flash Flood Watch	GGW	11 hr
Jun 12, 12:52 PM MDT	Mesoscale Discussion	SPC	53 min
Jun 13, 2:35 PM MDT	Flash Flood Watch	GGW	21 hr
Jun 14, 3:53 AM MDT	Areal Flood Warning	GGW	8 hr
Jun 15, 10:56 PM MDT	Severe Thunderstorm Warning	GGW	64 min
Jun 16, 3:37 AM MDT	Flash Flood Watch	GGW	40 hr
Jun 18, 3:01 PM MDT	Flash Flood Watch	GGW	36 hr
Jun 19, 7:14 PM MDT	Flash Flood Warning	GGW	3 hr
Jun 23, 2:57 PM MDT	Flash Flood Watch	GGW	13 hr
Jun 29, 6:17 PM MDT	Mesoscale Discussion	SPC	118 min
Jun 29, 9:57 PM MDT	Special Weather Statement	GGW	63 min
Jul 2, 12:17 PM MDT	Mesoscale Discussion	SPC	58 min
Jul 2, 8:19 PM MDT	Severe Thunderstorm Warning	GGW	56 min
Jul 2, 8:49 PM MDT	Flash Flood Warning	GGW	3 hr
Jul 3, 4:08 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 3, 6:29 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 3, 8:02 PM MDT	Mesoscale Discussion	SPC	58 min
Jul 3, 10:30 PM MDT	Mesoscale Discussion	SPC	90 min
Jul 3, 11:00 PM MDT	Special Weather Statement	GGW	60 min
Jul 5, 10:23 PM MDT	Special Weather Statement	GGW	67 min
Jul 8, 12:59 AM MDT	Special Weather Statement	GGW	61 min
Jul 8, 1:52 AM MDT	Flash Flood Warning	GGW	4 hr
Jul 8, 1:02 PM MDT	Special Weather Statement	GGW	58 min
Jul 8, 1:13 PM MDT	Mesoscale Discussion	SPC	62 min
Jul 8, 2:26 PM MDT	Special Weather Statement	GGW	64 min
Jul 14, 1:56 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 14, 6:33 PM MDT	Mesoscale Discussion	SPC	57 min
Jul 14, 8:42 PM MDT	Severe Thunderstorm Warning	GGW	63 min
Jul 14, 9:33 PM MDT	Severe Thunderstorm Warning	GGW	57 min
Jul 14, 10:29 PM MDT	Severe Thunderstorm Warning	GGW	46 min
Jul 15, 1:54 AM MDT	Mesoscale Discussion	SPC	2 hr
Jul 15, 6:26 PM MDT	Mesoscale Discussion	SPC	64 min
Jul 15, 9:40 PM MDT	Flash Flood Warning	GGW	4 hr
Jul 15, 9:50 PM MDT	Special Weather Statement	GGW	55 min
Jul 15, 10:06 PM MDT	Severe Thunderstorm Warning	GGW	54 min
Jul 16, 1:52 AM MDT	Flash Flood Warning	GGW	3 hr
Jul 16, 4:14 PM MDT	Mesoscale Discussion	SPC	61 min
Jul 18, 9:01 AM MDT	Heat Advisory	GGW	35 hr
Jul 22, 10:05 AM MDT	Mesoscale Discussion	SPC	55 min
Jul 22, 1:06 PM MDT	Mesoscale Discussion	SPC	24 min
Jul 22, 1:25 PM MDT	Tornado Watch	SPC	8 hr
Jul 22, 4:09 PM MDT	Severe Thunderstorm Warning	GGW	36 min
Jul 22, 4:17 PM MDT	Mesoscale Discussion	SPC	88 min
Jul 22, 4:23 PM MDT	Severe Thunderstorm Warning	GGW	67 min
Jul 22, 4:35 PM MDT	Severe Thunderstorm Warning	GGW	55 min
Jul 22, 4:58 PM MDT	Severe Thunderstorm Warning	GGW	32 min
Jul 22, 5:07 PM MDT	Flash Flood Warning	GGW	2 hr
Jul 22, 5:12 PM MDT	Severe Thunderstorm Warning	GGW	63 min
Jul 22, 6:15 PM MDT	Severe Thunderstorm Warning	GGW	46 min
Jul 25, 5:15 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 25, 5:47 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 25, 9:07 PM MDT	Mesoscale Discussion	SPC	83 min
Jul 26, 1:07 PM MDT	Mesoscale Discussion	SPC	53 min
Jul 26, 2:43 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 26, 6:05 PM MDT	Mesoscale Discussion	SPC	85 min
Jul 29, 4:46 PM MDT	Mesoscale Discussion	SPC	59 min
Jul 29, 5:02 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 29, 7:29 PM MDT	Severe Thunderstorm Warning	GGW	31 min
Jul 29, 7:33 PM MDT	Tornado Warning	GGW	27 min
Jul 29, 7:54 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Jul 29, 9:14 PM MDT	Mesoscale Discussion	SPC	61 min
Aug 4, 2:24 PM MDT	Mesoscale Discussion	SPC	96 min
Aug 4, 3:58 PM MDT	Severe Thunderstorm Warning	GGW	62 min
Aug 4, 4:44 PM MDT	Special Weather Statement	GGW	61 min
Aug 4, 4:49 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 4, 5:14 PM MDT	Severe Thunderstorm Warning	GGW	46 min
Aug 4, 5:28 PM MDT	Severe Thunderstorm Warning	GGW	15 min
Aug 4, 7:36 PM MDT	Flash Flood Watch	GGW	24 hr
Aug 5, 3:47 AM MDT	Special Weather Statement	GGW	58 min
Aug 5, 9:07 AM MDT	Flash Flood Warning	GGW	3 hr
Aug 5, 12:22 PM MDT	Special Weather Statement	GGW	53 min
Aug 11, 3:40 PM MDT	Mesoscale Discussion	SPC	95 min
Aug 11, 4:06 PM MDT	Severe Thunderstorm Warning	GGW	39 min
Aug 14, 5:56 PM MDT	Mesoscale Discussion	SPC	94 min
Aug 15, 4:23 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 15, 8:37 PM MDT	Mesoscale Discussion	SPC	83 min
Aug 21, 3:39 AM MDT	Fire Weather Watch	GGW	23 hr
Aug 22, 2:53 AM MDT	Red Flag Warning	GGW	17 hr
Aug 23, 2:48 AM MDT	Red Flag Warning	GGW	18 hr
Aug 24, 2:11 PM MDT	Fire Weather Watch	GGW	13 hr
Aug 25, 3:35 AM MDT	Red Flag Warning	GGW	17 hr
Aug 31, 7:08 PM MDT	Severe Thunderstorm Warning	GGW	52 min
Aug 31, 7:24 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Aug 31, 7:24 PM MDT	Mesoscale Discussion	SPC	66 min
Aug 31, 7:58 PM MDT	Severe Thunderstorm Warning	GGW	47 min
Aug 31, 9:05 PM MDT	Severe Thunderstorm Warning	GGW	55 min
Sep 27, 2:49 PM MDT	Red Flag Warning	GGW	29 hr
Sep 30, 2:19 PM MDT	Fire Weather Watch	GGW	13 hr
Oct 1, 3:41 AM MDT	Red Flag Warning	GGW	23 hr
Oct 3, 2:42 PM MDT	Red Flag Warning	GGW	29 hr
Nov 2, 12:29 PM MDT	Fire Weather Watch	GGW	15 hr
Nov 3, 3:23 AM MDT	Red Flag Warning	GGW	14 hr
Nov 3, 2:37 PM MDT	Winter Storm Watch	GGW	37 hr
Nov 5, 3:41 AM MDT	Winter Storm Warning	GGW	24 hr
Nov 18, 3:03 PM MST	Winter Weather Advisory	GGW	24 hr
Nov 29, 2:33 PM MST	Winter Weather Advisory	GGW	37 hr
Dec 3, 3:18 AM MST	Winter Weather Advisory	GGW	38 hr
Dec 12, 9:27 PM MST	Dense Fog Advisory	GGW	35 hr
Dec 16, 8:26 AM MST	Dense Fog Advisory	GGW	18 hr
Dec 21, 1:49 AM MST	Winter Weather Advisory	GGW	13 hr
Dec 26, 2:41 AM MST	High Wind Warning	GGW	12 hr
Dec 28, 3:38 AM MST	High Wind Watch	GGW	24 hr
Dec 29, 4:05 AM MST	High Wind Warning	GGW	19 hr
Dec 30, 3:23 AM MST	High Wind Watch	GGW	23 hr
Dec 31, 2:45 AM MST	High Wind Warning	GGW	12 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
Tornado Warning	1
Severe Thunderstorm Watch	8
Tornado Watch	1
Mesoscale Discussion	28
Special Weather Statement	11
Flooding
Areal Flood Warning	9
Flash Flood Warning	7
River Flood Warning	5
Flash Flood Watch	6
Flood Watch	4
Areal Flood Advisory	3
Winter
Blizzard Warning	3
Winter Storm Warning	3
Winter Storm Watch	7
Freezing Rain Advisory	1
Winter Weather Advisory	24
Heat
Heat Advisory	1
Cold
Wind Chill Warning	4
Wind Chill Advisory	15
Wind and dust
High Wind Warning	5
High Wind Watch	4
Fire
Red Flag Warning	7
Fire Weather Watch	4
Fog and smoke
Dense Fog Advisory	2

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2010 2012

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.