Alert archive / North Dakota / Williams County

Weather alerts in Williams County, North Dakota, 2013

147 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Williams County and its neighbors

Each county as a circle sized by its count in 2013. Tap one for its archive.

Alerts: 147
Warnings: 45
Watches: 25
Advisories: 56
Busiest month: July31 alerts
Busiest day: July 13, 20138 alerts

Over time

By month

Warning verification

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

0 of 1 tornado warnings covering Williams County in 2013 had a tornado report inside them.

Williams County, 2013

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	24	12	50%	8	63%	16 min
Flash flood warnings	0			0

Each office's whole area, 2013

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	16	4	75%	10	50%	8 min
NWS Bismarck, ND: severe thunderstorm warnings	239	139	42%	276	90%	24 min
NWS Bismarck, ND: flash flood warnings	14	5	64%	7	86%	55 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 7, 3:05 AM CST	High Wind Watch	BIS	10 hr
Jan 7, 1:17 PM CST	Wind Advisory	BIS	26 hr
Jan 9, 3:17 AM CST	Winter Storm Watch	BIS	37 hr
Jan 10, 4:30 PM CST	Winter Weather Advisory	BIS	41 hr
Jan 11, 6:12 PM CST	Blizzard Warning	BIS	16 hr
Jan 12, 2:41 AM CST	Wind Chill Advisory	BIS	9 hr
Jan 12, 3:24 PM CST	Wind Chill Advisory	BIS	18 hr
Jan 19, 3:37 PM CST	Wind Chill Warning	BIS	45 hr
Jan 19, 3:37 PM CST	Wind Chill Advisory	BIS	42 hr
Jan 21, 10:02 AM CST	Wind Chill Advisory	BIS	24 hr
Jan 28, 3:38 PM CST	Wind Chill Watch	BIS	24 hr
Jan 28, 9:22 PM CST	Dense Fog Advisory	BIS	12 hr
Jan 29, 4:19 AM CST	Wind Chill Advisory	BIS	44 hr
Jan 29, 3:17 PM CST	Wind Chill Warning	BIS	66 hr
Jan 31, 12:58 PM CST	Wind Chill Advisory	BIS	23 hr
Feb 1, 2:45 PM CST	Wind Advisory	BIS	27 hr
Feb 2, 12:49 PM CST	Blizzard Warning	BIS	5 hr
Feb 7, 12:18 PM CST	Dense Fog Advisory	BIS	9 hr
Feb 12, 3:46 PM CST	Winter Weather Advisory	BIS	43 hr
Feb 17, 4:37 AM CST	Winter Weather Advisory	BIS	37 hr
Feb 18, 3:29 PM CST	Wind Chill Advisory	BIS	45 hr
Mar 2, 3:03 AM CST	Winter Storm Watch	BIS	13 hr
Mar 2, 3:40 PM CST	Winter Storm Warning	BIS	57 hr
Mar 4, 4:08 AM CST	Blizzard Warning	BIS	20 hr
Mar 11, 2:58 PM CDT	Winter Weather Advisory	BIS	22 hr
Mar 14, 4:03 AM CDT	Winter Weather Advisory	BIS	42 hr
Mar 15, 4:17 PM CDT	Winter Storm Watch	BIS	24 hr
Mar 16, 4:37 PM CDT	Winter Storm Warning	BIS	42 hr
Mar 16, 4:37 PM CDT	Winter Weather Advisory	BIS	46 hr
Mar 19, 3:43 PM CDT	Wind Chill Advisory	BIS	18 hr
Mar 28, 12:38 AM CDT	Dense Fog Advisory	BIS	13 hr
Mar 28, 6:56 PM CDT	Dense Fog Advisory	BIS	20 hr
Mar 30, 12:55 AM CDT	Dense Fog Advisory	BIS	12 hr
Apr 4, 10:54 PM CDT	River Flood Watch	BIS	38 hr
Apr 6, 9:20 AM CDT	Dense Fog Advisory	BIS	3 hr
Apr 6, 4:08 PM CDT	Freezing Rain Advisory	BIS	23 hr
Apr 7, 4:57 AM CDT	Winter Weather Advisory	BIS	35 hr
Apr 12, 4:35 AM CDT	Winter Storm Watch	BIS	24 hr
Apr 13, 4:12 AM CDT	Winter Storm Warning	BIS	57 hr
May 9, 2:20 PM CDT	Fire Weather Watch	BIS	14 hr
May 10, 4:34 AM CDT	Red Flag Warning	BIS	14 hr
May 10, 10:04 AM CDT	Wind Advisory	BIS	9 hr
May 11, 3:40 PM CDT	Fire Weather Watch	BIS	37 hr
May 12, 4:40 AM CDT	Fire Weather Watch	BIS	35 hr
May 12, 3:55 PM CDT	High Wind Watch	BIS	37 hr
May 13, 4:39 AM CDT	Red Flag Warning	BIS	15 hr
May 13, 3:54 PM CDT	Red Flag Warning	BIS	29 hr
May 13, 8:52 PM CDT	Wind Advisory	BIS	23 hr
May 14, 12:47 AM CDT	Severe Thunderstorm Warning	BIS	58 min
May 19, 4:18 AM CDT	Flood Watch	BIS	47 hr
May 19, 2:44 PM CDT	Wind Advisory	BIS	40 hr
May 19, 8:56 PM CDT	River Flood Warning	BIS	14 hr
May 30, 1:26 PM CDT	Areal Flood Advisory	BIS	24 hr
May 31, 8:28 AM CDT	Areal Flood Advisory	BIS	9 hr
May 31, 11:58 AM CDT	River Flood Warning	BIS	58 hr
Jun 3, 12:04 PM CDT	Flood Watch	BIS	42 hr
Jun 9, 9:42 PM CDT	Severe Thunderstorm Warning	BIS	48 min
Jun 14, 4:01 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Jun 15, 12:10 PM CDT	Wind Advisory	BIS	7 hr
Jun 20, 1:57 AM CDT	Mesoscale Discussion	SPC	93 min
Jun 20, 4:12 AM CDT	Severe Thunderstorm Warning	BIS	63 min
Jun 21, 6:28 AM CDT	Dense Fog Advisory	BIS	5 hr
Jun 21, 11:08 PM CDT	Severe Thunderstorm Warning	BIS	67 min
Jun 22, 12:11 AM CDT	Severe Thunderstorm Warning	BIS	64 min
Jun 24, 7:39 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 25, 2:45 AM CDT	Flash Flood Watch	BIS	20 hr
Jun 25, 3:49 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 3, 4:54 PM CDT	Mesoscale Discussion	SPC	96 min
Jul 5, 3:36 PM CDT	Mesoscale Discussion	SPC	54 min
Jul 8, 5:58 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 8, 6:22 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 11, 3:55 PM CDT	Mesoscale Discussion	SPC	65 min
Jul 11, 4:50 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 11, 6:25 PM CDT	Severe Thunderstorm Warning	BIS	50 min
Jul 11, 6:58 PM CDT	Severe Thunderstorm Warning	BIS	47 min
Jul 11, 7:28 PM CDT	Severe Thunderstorm Warning	BIS	47 min
Jul 11, 7:34 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 13, 3:08 PM CDT	Mesoscale Discussion	SPC	67 min
Jul 13, 3:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 13, 4:10 PM CDT	Special Weather Statement	GGW	20 min
Jul 13, 4:44 PM CDT	Severe Thunderstorm Warning	BIS	46 min
Jul 13, 4:49 PM CDT	Severe Thunderstorm Warning	BIS	41 min
Jul 13, 4:54 PM CDT	Tornado Warning	BIS	36 min
Jul 13, 5:29 PM CDT	Severe Thunderstorm Warning	BIS	46 min
Jul 13, 6:13 PM CDT	Severe Thunderstorm Warning	BIS	47 min
Jul 15, 2:51 PM CDT	Mesoscale Discussion	SPC	84 min
Jul 15, 3:48 PM CDT	Tornado Watch	SPC	8 hr
Jul 15, 7:27 PM CDT	Mesoscale Discussion	SPC	63 min
Jul 15, 8:00 PM CDT	Severe Thunderstorm Warning	BIS	60 min
Jul 15, 8:33 PM CDT	Severe Thunderstorm Warning	BIS	57 min
Jul 15, 9:35 PM CDT	Severe Thunderstorm Warning	BIS	55 min
Jul 16, 1:11 AM CDT	Mesoscale Discussion	SPC	64 min
Jul 16, 1:42 AM CDT	Areal Flood Advisory	BIS	4 hr
Jul 20, 5:44 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 21, 2:43 PM CDT	Tornado Watch	SPC	7 hr
Jul 21, 3:07 PM CDT	Severe Thunderstorm Warning	BIS	68 min
Jul 21, 3:19 PM CDT	Severe Thunderstorm Warning	BIS	26 min
Jul 24, 2:21 PM CDT	Mesoscale Discussion	SPC	84 min
Aug 4, 6:27 PM CDT	Mesoscale Discussion	SPC	63 min
Aug 4, 7:19 PM CDT	Severe Thunderstorm Warning	BIS	41 min
Aug 5, 6:29 AM CDT	Dense Fog Advisory	BIS	4 hr
Aug 5, 6:07 PM CDT	Mesoscale Discussion	SPC	53 min
Aug 11, 6:04 AM CDT	Dense Fog Advisory	BIS	4 hr
Aug 26, 6:21 PM CDT	Severe Thunderstorm Warning	BIS	54 min
Aug 26, 7:53 PM CDT	Severe Thunderstorm Warning	BIS	22 min
Aug 28, 8:55 PM CDT	Mesoscale Discussion	SPC	95 min
Aug 28, 11:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 29, 12:36 AM CDT	Severe Thunderstorm Warning	BIS	54 min
Aug 30, 3:48 PM CDT	Mesoscale Discussion	SPC	117 min
Aug 30, 4:01 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 7, 3:31 PM CDT	Flash Flood Watch	BIS	39 hr
Sep 17, 11:42 PM CDT	Special Weather Statement	BIS	33 min
Sep 18, 7:04 PM CDT	Special Weather Statement	BIS	56 min
Sep 18, 7:41 PM CDT	Severe Thunderstorm Warning	BIS	49 min
Sep 18, 8:27 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 18, 8:28 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Sep 19, 3:24 PM CDT	Frost Advisory	BIS	18 hr
Oct 1, 9:08 PM CDT	Frost Advisory	BIS	9 hr
Oct 2, 9:45 PM CDT	Frost Advisory	BIS	11 hr
Oct 4, 3:49 PM CDT	Freeze Warning	BIS	18 hr
Oct 5, 2:45 PM CDT	Freeze Warning	BIS	19 hr
Oct 9, 3:27 PM CDT	High Wind Watch	BIS	24 hr
Oct 10, 3:56 PM CDT	Wind Advisory	BIS	39 hr
Oct 12, 3:34 AM CDT	Freeze Warning	BIS	30 hr
Nov 20, 12:23 PM CST	Winter Weather Advisory	BIS	8 hr
Nov 20, 8:20 PM CST	Wind Chill Advisory	BIS	13 hr
Nov 22, 4:01 AM CST	Wind Chill Advisory	BIS	31 hr
Dec 1, 6:03 AM CST	Winter Storm Watch	BIS	32 hr
Dec 1, 6:55 AM CST	Freezing Rain Advisory	BIS	5 hr
Dec 1, 3:21 PM CST	Winter Weather Advisory	BIS	22 hr
Dec 1, 3:21 PM CST	Freezing Rain Advisory	BIS	19 hr
Dec 2, 1:36 PM CST	Winter Storm Warning	BIS	58 hr
Dec 3, 1:53 AM CST	Winter Weather Advisory	BIS	40 hr
Dec 4, 3:13 PM CST	Wind Chill Advisory	BIS	57 hr
Dec 6, 2:38 PM CST	Wind Chill Warning	BIS	22 hr
Dec 7, 12:49 PM CST	Wind Chill Advisory	BIS	49 hr
Dec 8, 1:21 PM CST	Winter Weather Advisory	BIS	34 hr
Dec 10, 3:33 PM CST	Wind Chill Advisory	BIS	20 hr
Dec 18, 3:22 AM CST	Wind Chill Advisory	BIS	32 hr
Dec 19, 3:42 PM CST	Wind Chill Advisory	BIS	18 hr
Dec 21, 3:36 AM CST	Wind Chill Advisory	BIS	33 hr
Dec 22, 3:58 AM CST	Wind Chill Advisory	BIS	50 hr
Dec 22, 3:52 PM CST	Wind Chill Warning	BIS	21 hr
Dec 27, 3:50 PM CST	Wind Chill Advisory	BIS	43 hr
Dec 27, 3:50 PM CST	Winter Weather Advisory	BIS	19 hr
Dec 28, 10:46 AM CST	Blizzard Warning	BIS	10 hr
Dec 30, 10:05 AM CST	Wind Chill Advisory	BIS	49 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	24
Tornado Warning	1
Severe Thunderstorm Watch	6
Tornado Watch	2
Mesoscale Discussion	18
Special Weather Statement	3
Flooding
River Flood Warning	2
Flash Flood Watch	2
Flood Watch	2
River Flood Watch	1
Areal Flood Advisory	3
Winter
Blizzard Warning	4
Winter Storm Warning	4
Winter Storm Watch	5
Freezing Rain Advisory	3
Winter Weather Advisory	12
Cold
Freeze Warning	3
Wind Chill Warning	4
Wind Chill Watch	1
Frost Advisory	3
Wind Chill Advisory	19
Wind and dust
High Wind Watch	3
Wind Advisory	7
Fire
Red Flag Warning	3
Fire Weather Watch	3
Fog and smoke
Dense Fog Advisory	9

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2012 2014

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.