Alert archive / North Dakota / Slope County

Weather alerts in Slope County, North Dakota, 2016

140 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Slope County and its neighbors

Each county as a circle sized by its count in 2016. Tap one for its archive.

Alerts: 140
Warnings: 32
Watches: 20
Advisories: 37
Busiest month: June36 alerts
Busiest day: June 22, 20167 alerts

Over time

By month

Warning verification

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

Slope County, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	16	12	25%	13	92%	28 min
Flash flood warnings	0			0

Each office's whole area, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	26	6	77%	18	61%	11 min
NWS Bismarck, ND: severe thunderstorm warnings	259	195	25%	463	91%	26 min
NWS Bismarck, ND: flash flood warnings	4	1	75%	5	40%	112 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 11, 4:33 AM MST	Winter Weather Advisory	BIS	14 hr
Jan 14, 4:32 AM MST	Freezing Rain Advisory	BIS	6 hr
Jan 16, 9:13 AM MST	Wind Chill Advisory	BIS	28 hr
Jan 17, 1:09 PM MST	Wind Chill Advisory	BIS	20 hr
Jan 24, 8:32 AM MST	Dense Fog Advisory	BIS	7 hr
Feb 5, 2:55 AM MST	High Wind Watch	BIS	23 hr
Feb 5, 1:44 PM MST	High Wind Warning	BIS	54 hr
Feb 13, 2:35 AM MST	Freezing Rain Advisory	BIS	15 hr
Feb 18, 3:18 AM MST	High Wind Warning	BIS	40 hr
Mar 15, 2:35 PM MDT	Wind Advisory	BIS	27 hr
Mar 23, 2:43 AM MDT	Freezing Rain Advisory	BIS	6 hr
Mar 30, 2:02 PM MDT	Wind Advisory	BIS	24 hr
Apr 2, 1:58 PM MDT	Fire Weather Watch	BIS	12 hr
Apr 3, 1:48 AM MDT	Red Flag Warning	BIS	17 hr
Apr 4, 1:51 PM MDT	High Wind Watch	BIS	13 hr
Apr 5, 2:32 AM MDT	High Wind Warning	BIS	19 hr
Apr 5, 2:32 AM MDT	Wind Advisory	BIS	24 hr
Apr 6, 2:53 AM MDT	Wind Advisory	BIS	16 hr
Apr 6, 11:25 PM MDT	Wind Advisory	BIS	19 hr
Apr 7, 2:55 AM MDT	Red Flag Warning	BIS	15 hr
Apr 8, 3:29 AM MDT	Fire Weather Watch	BIS	24 hr
Apr 9, 2:59 AM MDT	Red Flag Warning	BIS	17 hr
Apr 13, 2:58 AM MDT	Red Flag Warning	BIS	15 hr
Apr 14, 3:44 PM MDT	Mesoscale Discussion	SPC	2 hr
Apr 15, 8:44 PM MDT	Winter Weather Advisory	BIS	20 hr
Apr 27, 7:26 AM MDT	Winter Weather Advisory	BIS	23 hr
May 10, 2:09 PM MDT	Wind Advisory	BIS	28 hr
May 11, 2:13 PM MDT	Frost Advisory	BIS	17 hr
May 13, 2:59 AM MDT	Freeze Warning	BIS	29 hr
May 14, 2:07 PM MDT	Freeze Warning	BIS	18 hr
May 15, 2:41 PM MDT	Frost Advisory	BIS	16 hr
May 20, 1:20 PM MDT	Wind Advisory	BIS	35 hr
May 31, 11:56 AM MDT	Wind Advisory	BIS	6 hr
Jun 2, 2:03 PM MDT	Mesoscale Discussion	SPC	2 hr
Jun 2, 2:38 PM MDT	Special Weather Statement	BIS	67 min
Jun 9, 6:05 PM MDT	Mesoscale Discussion	SPC	85 min
Jun 9, 6:43 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 9, 8:49 PM MDT	Severe Thunderstorm Warning	BIS	56 min
Jun 9, 9:25 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 11, 2:50 PM MDT	Mesoscale Discussion	SPC	85 min
Jun 11, 5:18 PM MDT	Mesoscale Discussion	SPC	117 min
Jun 11, 5:51 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 11, 7:09 PM MDT	Severe Thunderstorm Warning	BIS	31 min
Jun 11, 7:36 PM MDT	Mesoscale Discussion	SPC	84 min
Jun 11, 10:04 PM MDT	Mesoscale Discussion	SPC	116 min
Jun 13, 3:40 PM MDT	Mesoscale Discussion	SPC	95 min
Jun 13, 4:07 PM MDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 13, 6:00 PM MDT	Mesoscale Discussion	SPC	90 min
Jun 16, 11:36 PM MDT	Mesoscale Discussion	SPC	84 min
Jun 16, 11:55 PM MDT	Severe Thunderstorm Warning	BIS	65 min
Jun 17, 12:26 AM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 17, 12:43 AM MDT	Severe Thunderstorm Warning	BIS	62 min
Jun 17, 11:07 PM MDT	Special Weather Statement	BIS	38 min
Jun 21, 3:09 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 21, 6:09 PM MDT	Special Weather Statement	BIS	36 min
Jun 21, 6:16 PM MDT	Severe Thunderstorm Warning	BIS	59 min
Jun 21, 6:35 PM MDT	Mesoscale Discussion	SPC	55 min
Jun 21, 6:49 PM MDT	Severe Thunderstorm Warning	BIS	56 min
Jun 21, 7:10 PM MDT	Severe Thunderstorm Warning	BIS	65 min
Jun 21, 7:35 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 21, 7:48 PM MDT	Severe Thunderstorm Warning	BIS	42 min
Jun 24, 2:34 PM MDT	Wind Advisory	BIS	29 hr
Jun 24, 4:16 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 24, 8:54 PM MDT	Mesoscale Discussion	SPC	96 min
Jun 24, 9:48 PM MDT	Special Weather Statement	BIS	57 min
Jun 24, 11:04 PM MDT	Mesoscale Discussion	SPC	116 min
Jun 29, 12:13 PM MDT	Mesoscale Discussion	SPC	92 min
Jun 29, 12:24 PM MDT	Special Weather Statement	BIS	51 min
Jun 29, 1:08 PM MDT	Special Weather Statement	BIS	52 min
Jul 2, 12:49 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 2, 5:27 PM MDT	Special Weather Statement	BIS	63 min
Jul 2, 6:05 PM MDT	Special Weather Statement	BIS	55 min
Jul 3, 2:38 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 6, 12:23 PM MDT	Mesoscale Discussion	SPC	67 min
Jul 6, 12:55 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 6, 3:06 PM MDT	Special Weather Statement	BIS	39 min
Jul 6, 3:40 PM MDT	Special Weather Statement	BIS	50 min
Jul 6, 3:50 PM MDT	Severe Thunderstorm Warning	BIS	55 min
Jul 6, 4:27 PM MDT	Severe Thunderstorm Warning	BIS	63 min
Jul 9, 10:41 PM MDT	Special Weather Statement	BIS	49 min
Jul 10, 1:19 PM MDT	Mesoscale Discussion	SPC	86 min
Jul 10, 1:48 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 10, 2:58 PM MDT	Severe Thunderstorm Warning	BIS	62 min
Jul 10, 3:55 PM MDT	Severe Thunderstorm Warning	BIS	50 min
Jul 10, 4:54 PM MDT	Severe Thunderstorm Warning	BIS	51 min
Jul 10, 5:36 PM MDT	Severe Thunderstorm Warning	BIS	54 min
Jul 11, 4:37 PM MDT	Wind Advisory	BIS	4 hr
Jul 12, 3:20 AM MDT	Wind Advisory	BIS	16 hr
Jul 14, 4:14 PM MDT	Special Weather Statement	BIS	31 min
Jul 19, 8:35 PM MDT	Special Weather Statement	BIS	25 min
Jul 22, 1:17 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 22, 3:06 PM MDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 22, 5:03 PM MDT	Severe Thunderstorm Warning	BIS	57 min
Jul 22, 8:38 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 31, 1:27 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 31, 2:24 PM MDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 31, 3:27 PM MDT	Special Weather Statement	BIS	33 min
Jul 31, 4:40 PM MDT	Special Weather Statement	BIS	35 min
Jul 31, 4:42 PM MDT	Mesoscale Discussion	SPC	2 hr
Jul 31, 7:46 PM MDT	Mesoscale Discussion	SPC	89 min
Aug 1, 2:06 AM MDT	Special Weather Statement	BIS	39 min
Aug 1, 2:45 AM MDT	Special Weather Statement	BIS	45 min
Aug 1, 3:25 AM MDT	Special Weather Statement	BIS	50 min
Aug 7, 10:01 PM MDT	Special Weather Statement	BIS	59 min
Aug 9, 4:16 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 9, 6:16 PM MDT	Special Weather Statement	BIS	44 min
Aug 9, 6:36 PM MDT	Severe Thunderstorm Warning	BIS	54 min
Aug 14, 2:24 PM MDT	Mesoscale Discussion	SPC	2 hr
Aug 14, 10:01 PM MDT	Special Weather Statement	BIS	29 min
Aug 15, 1:34 PM MDT	Mesoscale Discussion	SPC	116 min
Aug 22, 2:00 AM MDT	Fire Weather Watch	BIS	27 hr
Sep 1, 3:02 AM MDT	Wind Advisory	BIS	15 hr
Sep 2, 4:16 PM MDT	Mesoscale Discussion	SPC	2 hr
Sep 18, 3:00 AM MDT	Wind Advisory	BIS	15 hr
Sep 24, 4:08 AM MDT	Wind Advisory	BIS	37 hr
Oct 3, 12:46 PM MDT	Mesoscale Discussion	SPC	59 min
Oct 5, 2:28 AM MDT	Wind Advisory	BIS	16 hr
Oct 5, 2:34 PM MDT	Freeze Warning	BIS	18 hr
Oct 6, 2:54 PM MDT	Freeze Warning	BIS	20 hr
Oct 7, 1:16 PM MDT	Freeze Warning	BIS	19 hr
Oct 30, 1:28 PM MDT	High Wind Watch	BIS	14 hr
Oct 31, 3:57 AM MDT	High Wind Warning	BIS	14 hr
Nov 26, 8:13 PM MST	Winter Storm Watch	BIS	18 hr
Nov 27, 2:26 PM MST	Winter Storm Warning	BIS	68 hr
Nov 27, 2:26 PM MST	Winter Weather Advisory	BIS	68 hr
Dec 5, 3:18 AM MST	Winter Weather Advisory	BIS	29 hr
Dec 6, 7:54 AM MST	Wind Chill Advisory	BIS	51 hr
Dec 8, 1:33 PM MST	Wind Chill Advisory	BIS	21 hr
Dec 9, 2:22 PM MST	Wind Chill Advisory	BIS	21 hr
Dec 12, 2:37 PM MST	Wind Chill Advisory	BIS	19 hr
Dec 13, 2:39 PM MST	Wind Chill Advisory	BIS	44 hr
Dec 15, 2:05 PM MST	Winter Weather Advisory	BIS	30 hr
Dec 16, 2:56 AM MST	Wind Chill Warning	BIS	56 hr
Dec 20, 1:38 PM MST	Wind Advisory	BIS	27 hr
Dec 22, 2:20 AM MST	Blizzard Watch	BIS	36 hr
Dec 23, 2:37 PM MST	Blizzard Warning	BIS	3 days
Dec 25, 11:56 AM MST	Mesoscale Discussion	SPC	5 hr
Dec 25, 5:33 PM MST	Mesoscale Discussion	SPC	6 hr
Dec 28, 3:08 AM MST	Winter Weather Advisory	BIS	21 hr
Dec 30, 4:40 PM MST	Winter Weather Advisory	BIS	5 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	16
Severe Thunderstorm Watch	12
Mesoscale Discussion	30
Special Weather Statement	21
Winter
Blizzard Warning	1
Winter Storm Warning	1
Blizzard Watch	1
Winter Storm Watch	1
Freezing Rain Advisory	3
Winter Weather Advisory	8
Cold
Freeze Warning	5
Wind Chill Warning	1
Frost Advisory	2
Wind Chill Advisory	7
Wind and dust
High Wind Warning	4
High Wind Watch	3
Wind Advisory	16
Fire
Red Flag Warning	4
Fire Weather Watch	3
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 2015 2017

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.