Alert archive / Montana / Sweet Grass County

Weather alerts in Sweet Grass County, Montana, 2017

132 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Sweet Grass County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts: 132
Warnings: 30
Watches: 20
Advisories: 49
Busiest month: December20 alerts
Busiest day: February 7, 20174 alerts

Over time

By month

Warning verification

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

Sweet Grass County, 2017

	Warnings	With a report	False alarm ratio
Tornado warnings	0
Severe thunderstorm warnings	2	1	50%
Flash flood warnings	0

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Billings, MT: severe thunderstorm warnings	31	15	52%	58	45%	23 min
NWS Billings, MT: flash flood warnings	1	1	0%	1	100%	45 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 3, 2:31 PM MST	Wind Chill Advisory	BYZ	45 hr
Jan 6, 2:07 PM MST	Winter Storm Watch	BYZ	25 hr
Jan 7, 3:16 PM MST	Winter Storm Warning	BYZ	5 days
Jan 10, 3:48 AM MST	Winter Weather Advisory	BYZ	35 hr
Jan 16, 3:00 AM MST	Wind Advisory	BYZ	72 hr
Jan 23, 3:10 AM MST	Winter Weather Advisory	BYZ	35 hr
Jan 28, 2:25 PM MST	Wind Advisory	BYZ	43 hr
Jan 29, 2:51 PM MST	Winter Storm Watch	BYZ	13 hr
Jan 30, 3:50 AM MST	Winter Storm Warning	BYZ	54 hr
Jan 30, 3:50 AM MST	Winter Weather Advisory	BYZ	54 hr
Feb 1, 3:22 PM MST	Winter Weather Advisory	BYZ	24 hr
Feb 4, 3:09 AM MST	High Wind Watch	BYZ	255 days
Feb 5, 2:53 AM MST	Wind Advisory	BYZ	26 hr
Feb 6, 5:16 PM MST	Special Weather Statement	BYZ	119 min
Feb 6, 7:14 PM MST	Special Weather Statement	BYZ	2 hr
Feb 6, 9:58 PM MST	Special Weather Statement	BYZ	2 hr
Feb 7, 4:13 AM MST	Winter Weather Advisory	BYZ	24 hr
Feb 8, 3:59 AM MST	High Wind Watch	BYZ	255 days
Feb 8, 2:17 PM MST	High Wind Warning	BYZ	39 hr
Feb 10, 11:57 AM MST	Areal Flood Advisory	BYZ	48 hr
Feb 14, 7:54 PM MST	Wind Advisory	BYZ	52 hr
Feb 20, 2:29 AM MST	Wind Advisory	BYZ	42 hr
Feb 22, 3:06 AM MST	Winter Storm Watch	BYZ	11 hr
Feb 22, 1:44 PM MST	Winter Storm Warning	BYZ	25 hr
Feb 22, 1:44 PM MST	Winter Weather Advisory	BYZ	44 hr
Feb 25, 5:29 PM MST	Special Weather Statement	BYZ	2 hr
Feb 25, 7:12 PM MST	Winter Weather Advisory	BYZ	11 hr
Feb 28, 2:48 PM MST	Wind Advisory	BYZ	24 hr
Mar 2, 10:41 PM MST	Wind Advisory	BYZ	36 hr
Mar 8, 4:41 AM MST	Winter Storm Warning	BYZ	57 hr
Mar 8, 3:24 PM MST	Winter Weather Advisory	BYZ	53 hr
Mar 21, 9:31 PM MDT	Special Weather Statement	BYZ	3 hr
Mar 29, 2:24 AM MDT	Winter Storm Watch	BYZ	14 hr
Mar 29, 3:58 PM MDT	Winter Storm Warning	BYZ	53 hr
Apr 3, 11:53 AM MDT	Winter Weather Advisory	BYZ	18 hr
Apr 4, 5:37 AM MDT	Special Weather Statement	BYZ	53 min
Apr 7, 3:50 AM MDT	Wind Advisory	BYZ	17 hr
Apr 23, 2:46 PM MDT	Winter Storm Watch	BYZ	13 hr
Apr 24, 4:15 AM MDT	Winter Storm Warning	BYZ	34 hr
Apr 28, 2:33 AM MDT	Winter Weather Advisory	BYZ	17 hr
Apr 29, 8:59 AM MDT	Special Weather Statement	BYZ	91 min
May 7, 2:57 PM MDT	Special Weather Statement	BYZ	48 min
May 7, 3:17 PM MDT	Severe Thunderstorm Warning	BYZ	28 min
May 15, 3:24 PM MDT	Winter Storm Watch	BYZ	36 hr
May 16, 3:19 PM MDT	Winter Storm Warning	BYZ	45 hr
May 17, 3:17 PM MDT	Winter Weather Advisory	BYZ	21 hr
May 18, 2:39 AM MDT	Areal Flood Advisory	BYZ	48 hr
May 30, 11:36 AM MDT	River Flood Watch	BYZ	6 days
May 31, 3:39 PM MDT	Special Weather Statement	BYZ	51 min
Jun 3, 11:12 AM MDT	River Flood Warning	BYZ	49 hr
Jun 6, 4:21 AM MDT	River Flood Warning	BYZ	4 days
Jun 7, 1:03 PM MDT	River Flood Watch	BYZ	4 days
Jun 12, 11:23 AM MDT	Mesoscale Discussion	SPC	3 hr
Jun 12, 2:17 PM MDT	Mesoscale Discussion	SPC	88 min
Jun 12, 2:45 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 12, 6:00 PM MDT	Mesoscale Discussion	SPC	90 min
Jun 12, 6:38 PM MDT	Special Weather Statement	BYZ	37 min
Jun 26, 3:53 PM MDT	Mesoscale Discussion	SPC	3 hr
Jun 28, 12:39 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 5, 5:34 PM MDT	Special Weather Statement	BYZ	56 min
Jul 9, 1:44 PM MDT	Mesoscale Discussion	SPC	3 hr
Jul 10, 1:20 PM MDT	Mesoscale Discussion	SPC	115 min
Jul 10, 1:36 PM MDT	Special Weather Statement	BYZ	39 min
Jul 10, 4:07 PM MDT	Special Weather Statement	BYZ	38 min
Jul 16, 2:36 PM MDT	Mesoscale Discussion	SPC	114 min
Jul 16, 2:58 PM MDT	Severe Thunderstorm Warning	BYZ	62 min
Jul 16, 8:24 PM MDT	Special Weather Statement	BYZ	81 min
Jul 20, 3:17 AM MDT	Red Flag Warning	BYZ	42 hr
Jul 20, 2:58 PM MDT	Red Flag Warning	BYZ	30 hr
Aug 25, 2:30 AM MDT	Special Weather Statement	BYZ	45 min
Sep 1, 2:29 PM MDT	Fire Weather Watch	BYZ	24 hr
Sep 2, 2:50 PM MDT	Red Flag Warning	BYZ	54 hr
Sep 8, 4:12 AM MDT	Fire Weather Watch	BYZ	11 hr
Sep 8, 3:03 PM MDT	Red Flag Warning	BYZ	29 hr
Sep 8, 6:06 PM MDT	Special Weather Statement	BYZ	114 min
Sep 9, 2:39 PM MDT	Special Weather Statement	BYZ	81 min
Sep 13, 3:25 PM MDT	Winter Storm Watch	BYZ	13 hr
Sep 14, 4:04 AM MDT	Winter Storm Warning	BYZ	58 hr
Sep 19, 8:18 PM MDT	Wind Advisory	BYZ	23 hr
Sep 20, 3:51 AM MDT	Winter Storm Watch	BYZ	11 hr
Sep 20, 2:51 PM MDT	Winter Storm Warning	BYZ	63 hr
Sep 21, 2:59 PM MDT	Winter Weather Advisory	BYZ	20 hr
Sep 30, 3:13 PM MDT	Winter Weather Advisory	BYZ	36 hr
Oct 6, 2:53 AM MDT	Wind Advisory	BYZ	36 hr
Oct 14, 3:15 AM MDT	Wind Advisory	BYZ	29 hr
Oct 17, 3:18 AM MDT	Wind Advisory	BYZ	24 hr
Oct 17, 3:23 AM MDT	Red Flag Warning	BYZ	24 hr
Oct 19, 2:27 PM MDT	Red Flag Warning	BYZ	30 hr
Oct 20, 4:31 PM MDT	Special Weather Statement	BYZ	89 min
Oct 21, 3:11 AM MDT	High Wind Warning	BYZ	47 hr
Oct 23, 3:04 PM MDT	Fire Weather Watch	BYZ	24 hr
Oct 24, 2:46 AM MDT	Wind Advisory	BYZ	42 hr
Oct 24, 3:01 PM MDT	Red Flag Warning	BYZ	36 hr
Oct 31, 2:57 AM MDT	Wind Advisory	BYZ	22 hr
Oct 31, 3:17 AM MDT	Winter Storm Warning	BYZ	48 hr
Oct 31, 2:22 PM MDT	Winter Weather Advisory	BYZ	37 hr
Oct 31, 2:34 PM MDT	Special Weather Statement	BYZ	3 hr
Nov 2, 3:22 AM MDT	Winter Storm Watch	BYZ	11 hr
Nov 2, 2:19 PM MDT	Winter Storm Watch	BYZ	13 hr
Nov 2, 2:19 PM MDT	Winter Storm Warning	BYZ	49 hr
Nov 2, 10:45 PM MDT	Special Weather Statement	BYZ	90 min
Nov 5, 2:50 AM MST	Winter Weather Advisory	BYZ	33 hr
Nov 11, 5:13 AM MST	Winter Weather Advisory	BYZ	7 hr
Nov 13, 5:12 PM MST	Wind Advisory	BYZ	10 hr
Nov 15, 8:57 PM MST	Wind Advisory	BYZ	14 hr
Nov 16, 3:22 AM MST	Winter Storm Warning	BYZ	38 hr
Nov 18, 3:15 AM MST	Wind Advisory	BYZ	32 hr
Nov 18, 1:18 PM MST	Special Weather Statement	BYZ	3 hr
Nov 19, 10:55 AM MST	High Wind Warning	BYZ	31 hr
Nov 21, 3:00 AM MST	Wind Advisory	BYZ	3 days
Nov 26, 2:09 AM MST	Wind Advisory	BYZ	27 hr
Nov 28, 8:52 PM MST	Wind Advisory	BYZ	17 hr
Dec 2, 2:02 PM MST	Winter Storm Warning	BYZ	38 hr
Dec 2, 2:02 PM MST	Winter Weather Advisory	BYZ	44 hr
Dec 12, 2:34 AM MST	Wind Advisory	BYZ	15 hr
Dec 14, 2:49 PM MST	Wind Advisory	BYZ	30 hr
Dec 15, 2:28 PM MST	Winter Weather Advisory	BYZ	32 hr
Dec 16, 2:53 PM MST	High Wind Watch	BYZ	12 hr
Dec 17, 2:43 AM MST	High Wind Warning	BYZ	42 hr
Dec 17, 7:42 AM MST	Winter Weather Advisory	BYZ	6 hr
Dec 19, 3:18 PM MST	Winter Weather Advisory	BYZ	36 hr
Dec 19, 3:20 PM MST	Wind Advisory	BYZ	12 hr
Dec 19, 9:16 PM MST	Special Weather Statement	BYZ	4 hr
Dec 21, 12:08 PM MST	Special Weather Statement	BYZ	4 hr
Dec 21, 3:08 PM MST	Winter Weather Advisory	BYZ	39 hr
Dec 22, 3:00 AM MST	Winter Storm Warning	BYZ	27 hr
Dec 23, 5:57 AM MST	Winter Weather Advisory	BYZ	29 hr
Dec 24, 11:51 AM MST	Winter Weather Advisory	BYZ	40 hr
Dec 27, 12:56 AM MST	Special Weather Statement	BYZ	4 hr
Dec 27, 4:04 AM MST	Winter Storm Watch	BYZ	24 hr
Dec 27, 4:04 AM MST	Winter Storm Warning	BYZ	3 days
Dec 29, 12:27 AM MST	Special Weather Statement	BYZ	3 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	2
Severe Thunderstorm Watch	1
Mesoscale Discussion	8
Special Weather Statement	25
Flooding
River Flood Warning	2
River Flood Watch	2
Areal Flood Advisory	2
Winter
Winter Storm Warning	15
Winter Storm Watch	11
Winter Weather Advisory	23
Cold
Wind Chill Advisory	1
Wind and dust
High Wind Warning	4
High Wind Watch	3
Wind Advisory	23
Fire
Red Flag Warning	7
Fire Weather Watch	3

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.