Alert archive / Montana / Petroleum County

Weather alerts in Petroleum County, Montana, 2011

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

Petroleum County and its neighbors

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

Alerts: 194
Warnings: 40
Watches: 31
Advisories: 91
Busiest month: July35 alerts
Busiest day: July 26, 20118 alerts

Over time

By month

Warning verification

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

Petroleum County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	12	3	75%	6	50%	14 min
Flash flood warnings	3	1	67%	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
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 20, 3:07 PM MST	Winter Storm Watch	GGW	13 hr
Jan 21, 3:56 AM MST	Winter Weather Advisory	GGW	32 hr
Jan 28, 2:07 PM MST	Areal Flood Advisory	GGW	52 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
Feb 1, 11:11 AM MST	Wind Chill Advisory	GGW	24 hr
Feb 4, 2:30 PM MST	Winter Weather Advisory	GGW	29 hr
Feb 5, 8:42 PM MST	Winter Storm Watch	GGW	19 hr
Feb 6, 3:21 PM MST	Wind Chill Advisory	GGW	43 hr
Feb 6, 3:21 PM MST	Winter Storm Warning	GGW	26 hr
Feb 6, 3:53 PM MST	Areal Flood Advisory	GGW	30 hr
Feb 8, 2:28 PM MST	Wind Chill Advisory	GGW	20 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, 12:12 AM MST	Areal Flood Advisory	GGW	36 hr
Feb 14, 11:36 AM MST	Areal Flood Advisory	GGW	4 hr
Feb 14, 11:48 AM MST	Flash Flood Warning	GGW	3 hr
Feb 14, 2:49 PM MST	Areal Flood Warning	GGW	5 days
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 18, 2:29 PM MST	Winter Storm Watch	GGW	24 hr
Feb 19, 1:12 PM MST	Areal Flood Advisory	GGW	54 hr
Feb 19, 2:30 PM MST	Winter Weather Advisory	GGW	31 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 28, 2:53 PM MST	Winter Weather Advisory	GGW	20 hr
Mar 11, 7:11 PM MST	Areal Flood Advisory	GGW	19 hr
Mar 12, 2:37 PM MST	Areal Flood Warning	GGW	8 days
Mar 15, 7:30 AM MDT	Flash Flood Warning	GGW	6 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 2, 3:26 AM MDT	Winter Weather Advisory	GGW	34 hr
Apr 7, 3:40 AM MDT	Winter Weather Advisory	GGW	35 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 Storm Warning	GGW	16 hr
Apr 29, 2:39 PM MDT	Lake Wind Advisory	GGW	29 hr
May 3, 11:42 AM MDT	Lake Wind Advisory	GGW	15 hr
May 4, 3:43 AM MDT	Lake Wind Advisory	GGW	17 hr
May 5, 2:24 PM MDT	Lake Wind Advisory	GGW	29 hr
May 8, 2:53 PM MDT	Lake Wind Advisory	GGW	53 hr
May 10, 3:24 AM MDT	Areal Flood Warning	GGW	6 hr
May 10, 9:08 AM MDT	Areal Flood Warning	GGW	24 hr
May 11, 8:09 AM MDT	Areal Flood Warning	GGW	70 hr
May 14, 4:00 AM MDT	High Wind Watch	GGW	24 hr
May 14, 4:00 AM MDT	Lake Wind Advisory	GGW	62 hr
May 14, 5:55 AM MDT	Areal Flood Advisory	GGW	50 hr
May 16, 10:11 AM MDT	Areal Flood Advisory	GGW	48 hr
May 18, 2:47 PM MDT	Flood Watch	GGW	44 hr
May 20, 7:59 AM MDT	Areal Flood Warning	GGW	69 hr
May 20, 10:06 AM MDT	Areal Flood Warning	GGW	67 hr
May 23, 4:16 AM MDT	Areal Flood Warning	GGW	36 days
May 23, 2:41 PM MDT	Lake Wind Advisory	GGW	29 hr
May 25, 3:30 AM MDT	Lake Wind Advisory	GGW	39 hr
May 27, 3:24 AM MDT	Flood Watch	GGW	4 days
May 28, 3:37 AM MDT	Lake Wind Advisory	GGW	16 hr
May 29, 3:04 AM MDT	Lake Wind Advisory	GGW	42 hr
May 30, 9:17 PM MDT	Lake Wind Advisory	GGW	17 hr
Jun 1, 3:38 AM MDT	Lake Wind Advisory	GGW	23 hr
Jun 2, 9:34 AM MDT	Lake Wind Advisory	GGW	35 hr
Jun 6, 3:14 AM MDT	Lake Wind Advisory	GGW	43 hr
Jun 6, 4:45 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 6, 5:46 PM MDT	Tornado Watch	SPC	7 hr
Jun 6, 8:25 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 6, 10:25 PM MDT	Severe Thunderstorm Warning	GGW	53 min
Jun 6, 10:25 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 7, 11:51 AM MDT	Flash Flood Warning	GGW	9 hr
Jun 9, 10:02 AM MDT	Lake Wind Advisory	GGW	11 hr
Jun 11, 2:17 PM MDT	Severe Thunderstorm Warning	GGW	43 min
Jun 11, 2:56 PM MDT	Special Weather Statement	GGW	49 min
Jun 12, 3:30 PM MDT	Special Weather Statement	GGW	60 min
Jun 12, 4:25 PM MDT	Special Weather Statement	GGW	65 min
Jun 13, 2:35 PM MDT	Flash Flood Watch	GGW	21 hr
Jun 14, 12:00 PM MDT	Lake Wind Advisory	GGW	7 hr
Jun 17, 10:26 AM MDT	Lake Wind Advisory	GGW	10 hr
Jun 23, 4:01 AM MDT	Lake Wind Advisory	GGW	20 hr
Jun 23, 2:57 PM MDT	Flash Flood Watch	GGW	13 hr
Jun 23, 4:50 PM MDT	Mesoscale Discussion	SPC	85 min
Jun 23, 6:59 PM MDT	Severe Thunderstorm Warning	GGW	61 min
Jun 29, 3:46 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 29, 6:17 PM MDT	Mesoscale Discussion	SPC	118 min
Jul 3, 12:31 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 3, 4:08 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 3, 6:24 PM MDT	Special Weather Statement	TFX	21 min
Jul 3, 6:29 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 3, 8:02 PM MDT	Mesoscale Discussion	SPC	58 min
Jul 7, 8:47 AM MDT	Special Weather Statement	TFX	43 min
Jul 7, 9:20 AM MDT	Special Weather Statement	GGW	25 min
Jul 7, 9:41 AM MDT	Severe Thunderstorm Warning	GGW	64 min
Jul 7, 9:59 AM MDT	Mesoscale Discussion	SPC	91 min
Jul 7, 10:27 AM MDT	Severe Thunderstorm Warning	GGW	40 min
Jul 8, 2:46 AM MDT	Lake Wind Advisory	GGW	13 hr
Jul 9, 3:10 AM MDT	Lake Wind Advisory	GGW	17 hr
Jul 11, 3:50 AM MDT	Lake Wind Advisory	GGW	53 hr
Jul 14, 11:04 AM MDT	Mesoscale Discussion	SPC	116 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 15, 2:39 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 15, 5:51 PM MDT	Severe Thunderstorm Warning	GGW	54 min
Jul 15, 6:26 PM MDT	Mesoscale Discussion	SPC	64 min
Jul 15, 6:36 PM MDT	Severe Thunderstorm Warning	GGW	54 min
Jul 16, 4:14 PM MDT	Mesoscale Discussion	SPC	61 min
Jul 16, 5:57 PM MDT	Severe Thunderstorm Warning	GGW	63 min
Jul 16, 6:36 PM MDT	Severe Thunderstorm Warning	GGW	54 min
Jul 19, 2:49 PM MDT	Mesoscale Discussion	SPC	86 min
Jul 19, 3:18 PM MDT	Lake Wind Advisory	GGW	27 hr
Jul 22, 4:17 PM MDT	Mesoscale Discussion	SPC	88 min
Jul 25, 5:47 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 25, 11:28 PM MDT	Special Weather Statement	BYZ	62 min
Jul 26, 1:07 PM MDT	Mesoscale Discussion	SPC	53 min
Jul 26, 2:03 PM MDT	Special Weather Statement	GGW	57 min
Jul 26, 2:18 PM MDT	Severe Thunderstorm Warning	GGW	57 min
Jul 26, 2:43 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 26, 3:11 PM MDT	Severe Thunderstorm Warning	GGW	36 min
Jul 26, 3:50 PM MDT	Special Weather Statement	GGW	25 min
Jul 26, 3:54 PM MDT	Severe Thunderstorm Warning	GGW	66 min
Aug 5, 6:09 AM MDT	Lake Wind Advisory	GGW	8 hr
Aug 8, 11:32 AM MDT	Lake Wind Advisory	GGW	8 hr
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 22, 2:35 PM MDT	Lake Wind Advisory	GGW	30 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 25, 3:36 AM MDT	Lake Wind Advisory	GGW	17 hr
Aug 26, 7:47 PM MDT	Special Weather Statement	TFX	28 min
Aug 26, 7:54 PM MDT	Special Weather Statement	GGW	66 min
Aug 29, 1:52 PM MDT	Mesoscale Discussion	SPC	83 min
Aug 29, 2:34 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 31, 12:19 AM MDT	Special Weather Statement	GGW	56 min
Aug 31, 3:33 AM MDT	Lake Wind Advisory	GGW	32 hr
Aug 31, 2:20 PM MDT	Mesoscale Discussion	SPC	115 min
Sep 1, 2:38 PM MDT	Lake Wind Advisory	GGW	37 hr
Sep 6, 3:05 AM MDT	Red Flag Warning	GGW	17 hr
Sep 11, 3:00 AM MDT	Lake Wind Advisory	GGW	31 hr
Sep 11, 3:03 AM MDT	Red Flag Warning	GGW	18 hr
Sep 18, 3:26 AM MDT	Lake Wind Advisory	GGW	15 hr
Sep 18, 6:25 PM MDT	Lake Wind Advisory	GGW	33 hr
Sep 19, 1:15 PM MDT	Mesoscale Discussion	SPC	2 hr
Sep 20, 3:46 AM MDT	Lake Wind Advisory	GGW	6 hr
Sep 22, 2:25 PM MDT	Fire Weather Watch	GGW	12 hr
Sep 23, 2:53 AM MDT	Red Flag Warning	GGW	17 hr
Sep 24, 2:54 PM MDT	Fire Weather Watch	GGW	12 hr
Sep 25, 3:21 AM MDT	Red Flag Warning	GGW	17 hr
Sep 25, 2:42 PM MDT	Lake Wind Advisory	GGW	27 hr
Sep 27, 2:27 PM MDT	Lake Wind Advisory	GGW	30 hr
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
Oct 3, 3:05 PM MDT	Lake Wind Advisory	GGW	27 hr
Oct 6, 2:57 PM MDT	High Wind Watch	GGW	13 hr
Oct 7, 4:23 AM MDT	High Wind Warning	GGW	13 hr
Oct 7, 5:10 PM MDT	Lake Wind Advisory	GGW	10 hr
Oct 11, 2:54 PM MDT	Lake Wind Advisory	GGW	29 hr
Oct 13, 2:08 AM MDT	Lake Wind Advisory	GGW	16 hr
Oct 21, 2:26 PM MDT	Lake Wind Advisory	GGW	27 hr
Oct 23, 3:02 AM MDT	Lake Wind Advisory	GGW	16 hr
Oct 26, 2:36 PM MDT	Lake Wind Advisory	GGW	24 hr
Oct 28, 2:19 PM MDT	Lake Wind Advisory	GGW	29 hr
Oct 31, 2:27 PM MDT	Lake Wind Advisory	GGW	5 hr
Nov 2, 3:37 AM MDT	Lake Wind Advisory	GGW	15 hr
Nov 2, 10:59 PM MDT	Lake Wind Advisory	GGW	13 hr
Nov 5, 3:41 AM MDT	Winter Weather Advisory	GGW	38 hr
Nov 6, 8:53 AM MST	Lake Wind Advisory	GGW	8 hr
Nov 8, 1:23 PM MST	Lake Wind Advisory	GGW	4 hr
Nov 11, 2:33 PM MST	Lake Wind Advisory	GGW	27 hr
Nov 13, 3:45 AM MST	Lake Wind Advisory	GGW	14 hr
Nov 14, 3:32 AM MST	Lake Wind Advisory	GGW	11 hr
Nov 15, 3:30 AM MST	Lake Wind Advisory	GGW	14 hr
Nov 16, 2:43 AM MST	High Wind Watch	GGW	24 hr
Nov 17, 2:54 AM MST	Lake Wind Advisory	GGW	20 hr
Nov 18, 4:02 AM MST	Lake Wind Advisory	GGW	15 hr
Nov 18, 3:03 PM MST	Winter Weather Advisory	GGW	24 hr
Nov 25, 2:44 AM MST	Lake Wind Advisory	GGW	31 hr
Nov 26, 2:53 PM MST	Lake Wind Advisory	GGW	30 hr
Nov 26, 2:56 PM MST	Fire Weather Watch	GGW	12 hr
Nov 27, 3:15 AM MST	Red Flag Warning	GGW	17 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 25, 2:41 PM MST	High Wind Warning	GGW	19 hr
Dec 27, 3:31 PM MST	High Wind Watch	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

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
Severe Thunderstorm Watch	6
Tornado Watch	1
Mesoscale Discussion	20
Special Weather Statement	12
Flooding
Areal Flood Warning	8
Flash Flood Warning	3
Flash Flood Watch	2
Flood Watch	2
Areal Flood Advisory	8
Winter
Winter Storm Warning	2
Winter Storm Watch	7
Freezing Rain Advisory	1
Winter Weather Advisory	18
Cold
Wind Chill Advisory	8
Wind and dust
High Wind Warning	4
High Wind Watch	7
Lake Wind Advisory	55
Fire
Red Flag Warning	11
Fire Weather Watch	6
Fog and smoke
Dense 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 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.