Alert archive / North Dakota / Williams County

Weather alerts in Williams County, North Dakota, 2019

105 weather alerts in 2019, 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 2019. Tap one for its archive.

Alerts: 105
Warnings: 35
Watches: 9
Advisories: 40
Busiest month: February16 alerts
Busiest day: June 29, 20196 alerts

Over time

By month

Warning verification

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

Williams County, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	17	8	53%	8	75%	15 min
Flash flood warnings	0			0

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	15	5	67%	6	83%	3 min
NWS Bismarck, ND: severe thunderstorm warnings	241	156	35%	269	90%	18 min
NWS Bismarck, ND: flash flood warnings	7	4	43%	6	100%	146 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 5, 9:11 PM CST	Dense Fog Advisory	BIS	12 hr
Jan 7, 2:35 PM CST	Wind Advisory	BIS	27 hr
Jan 12, 6:59 PM CST	Dense Fog Advisory	BIS	14 hr
Jan 22, 5:29 AM CST	Winter Storm Watch	BIS	23 hr
Jan 23, 3:27 PM CST	Wind Chill Advisory	BIS	45 hr
Jan 26, 3:51 AM CST	High Wind Watch	BIS	24 hr
Jan 27, 3:34 AM CST	High Wind Warning	BIS	24 hr
Jan 28, 3:50 AM CST	Wind Chill Warning	BIS	3 days
Jan 28, 3:50 AM CST	Wind Chill Advisory	BIS	3 days
Feb 1, 2:48 PM CST	Winter Storm Watch	BIS	24 hr
Feb 2, 4:06 AM CST	Winter Storm Warning	BIS	56 hr
Feb 4, 11:49 AM CST	Wind Chill Advisory	BIS	24 hr
Feb 6, 3:29 AM CST	Wind Chill Advisory	BIS	39 hr
Feb 6, 11:37 PM CST	Wind Chill Warning	BIS	36 hr
Feb 8, 3:57 AM CST	Wind Chill Advisory	BIS	56 hr
Feb 10, 2:47 PM CST	Wind Chill Advisory	BIS	15 hr
Feb 11, 2:54 PM CST	Wind Chill Advisory	BIS	21 hr
Feb 13, 2:16 PM CST	Wind Chill Advisory	BIS	46 hr
Feb 14, 3:56 PM CST	Wind Chill Warning	BIS	20 hr
Feb 18, 1:49 PM CST	Wind Chill Advisory	BIS	20 hr
Feb 23, 3:38 PM CST	Wind Chill Advisory	BIS	44 hr
Feb 24, 2:44 PM CST	Wind Chill Warning	BIS	21 hr
Feb 25, 3:46 PM CST	Wind Chill Advisory	BIS	17 hr
Feb 26, 2:20 PM CST	Wind Chill Warning	BIS	21 hr
Feb 27, 11:43 AM CST	Wind Chill Advisory	BIS	3 hr
Mar 1, 2:27 PM CST	Wind Chill Advisory	BIS	30 hr
Mar 1, 9:07 PM CST	Wind Chill Warning	BIS	60 hr
Mar 2, 8:39 PM CST	Wind Chill Warning	BIS	15 hr
Mar 3, 2:47 AM CST	Wind Chill Advisory	BIS	30 hr
Mar 4, 3:59 AM CST	Winter Weather Advisory	BIS	17 hr
Mar 11, 1:13 AM CDT	Dense Fog Advisory	BIS	24 min
Mar 11, 1:37 AM CDT	Dense Fog Advisory	BIS	9 hr
Mar 21, 12:17 PM CDT	River Flood Warning	BIS	12 days
Mar 21, 9:50 PM CDT	River Flood Warning	BIS	3 days
Apr 5, 6:49 AM CDT	Dense Fog Advisory	BIS	6 hr
Apr 5, 9:39 PM CDT	Dense Fog Advisory	BIS	36 hr
Apr 18, 3:01 AM CDT	Dense Fog Advisory	BIS	7 hr
Apr 19, 9:12 AM CDT	Red Flag Warning	BIS	11 hr
Apr 24, 3:23 PM CDT	Fire Weather Watch	BIS	12 hr
Apr 25, 3:16 AM CDT	Wind Advisory	BIS	16 hr
Apr 25, 3:22 AM CDT	Red Flag Warning	BIS	17 hr
Apr 27, 3:18 AM CDT	Winter Storm Watch	BIS	12 hr
Apr 27, 3:06 PM CDT	Winter Storm Warning	BIS	40 hr
May 19, 3:40 AM CDT	Frost Advisory	BIS	29 hr
May 27, 2:43 PM CDT	Frost Advisory	BIS	18 hr
May 31, 8:18 PM CDT	River Flood Warning	BIS	68 days
Jun 28, 10:48 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 28, 11:41 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 29, 2:15 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 29, 3:00 AM CDT	Special Weather Statement	BIS	60 min
Jun 29, 3:10 AM CDT	Severe Thunderstorm Warning	BIS	36 min
Jun 29, 3:53 AM CDT	Severe Thunderstorm Warning	BIS	52 min
Jul 1, 7:18 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 1, 8:45 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 1, 9:59 PM CDT	Severe Thunderstorm Warning	BIS	61 min
Jul 8, 3:40 PM CDT	Mesoscale Discussion	SPC	65 min
Jul 9, 1:54 PM CDT	Areal Flood Advisory	BIS	9 hr
Jul 9, 10:02 PM CDT	River Flood Warning	BIS	12 hr
Jul 9, 10:36 PM CDT	Areal Flood Advisory	BIS	23 hr
Jul 12, 4:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 12, 8:00 PM CDT	Special Weather Statement	BIS	30 min
Jul 12, 8:37 PM CDT	Severe Thunderstorm Warning	BIS	53 min
Jul 14, 11:50 PM CDT	Mesoscale Discussion	SPC	85 min
Jul 15, 12:12 AM CDT	Special Weather Statement	BIS	48 min
Jul 17, 3:41 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 31, 3:51 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 12:43 PM CDT	Severe Thunderstorm Warning	BIS	47 min
Aug 1, 1:00 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 1:10 PM CDT	Severe Thunderstorm Warning	BIS	50 min
Aug 1, 1:34 PM CDT	Severe Thunderstorm Warning	BIS	28 min
Aug 1, 1:59 PM CDT	Severe Thunderstorm Warning	BIS	46 min
Aug 3, 3:22 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 4, 11:02 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 4, 11:29 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 5, 12:08 AM CDT	Severe Thunderstorm Warning	BIS	67 min
Aug 5, 3:08 AM CDT	Mesoscale Discussion	SPC	97 min
Aug 23, 6:34 PM CDT	Special Weather Statement	BIS	41 min
Aug 24, 8:19 AM CDT	Special Weather Statement	BIS	26 min
Aug 24, 9:09 AM CDT	Special Weather Statement	BIS	36 min
Sep 2, 10:54 AM CDT	Severe Thunderstorm Warning	BIS	36 min
Sep 2, 10:54 AM CDT	Mesoscale Discussion	SPC	96 min
Sep 2, 11:23 AM CDT	Severe Thunderstorm Warning	BIS	52 min
Sep 2, 11:27 AM CDT	Severe Thunderstorm Warning	BIS	48 min
Sep 2, 11:31 AM CDT	Severe Thunderstorm Warning	BIS	44 min
Sep 2, 12:18 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Sep 17, 8:48 PM CDT	Severe Thunderstorm Warning	BIS	57 min
Sep 17, 9:44 PM CDT	Severe Thunderstorm Warning	BIS	46 min
Sep 17, 10:24 PM CDT	Severe Thunderstorm Warning	BIS	66 min
Sep 21, 1:02 AM CDT	Special Weather Statement	BIS	43 min
Sep 25, 3:07 PM CDT	Special Weather Statement	BIS	23 min
Sep 27, 1:36 PM CDT	Frost Advisory	BIS	19 hr
Sep 30, 2:07 PM CDT	Freeze Warning	BIS	16 hr
Oct 3, 2:06 PM CDT	Freeze Warning	BIS	11 hr
Oct 8, 4:23 AM CDT	Winter Weather Advisory	BIS	47 hr
Oct 25, 5:40 PM CDT	Wind Advisory	BIS	23 hr
Nov 14, 7:51 PM CST	Dense Fog Advisory	BIS	19 hr
Nov 19, 2:35 PM CST	Winter Weather Advisory	BIS	24 hr
Nov 27, 3:45 AM CST	Winter Storm Watch	BIS	35 hr
Nov 28, 2:44 PM CST	Winter Weather Advisory	BIS	59 hr
Nov 28, 3:55 PM CST	Winter Weather Advisory	BIS	54 hr
Dec 7, 2:47 PM CST	Winter Weather Advisory	BIS	36 hr
Dec 9, 1:45 PM CST	Wind Chill Advisory	BIS	22 hr
Dec 10, 2:45 PM CST	Wind Chill Advisory	BIS	21 hr
Dec 13, 2:46 PM CST	Wind Chill Advisory	BIS	20 hr
Dec 29, 9:46 AM CST	Dense Fog Advisory	BIS	4 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	17
Severe Thunderstorm Watch	3
Mesoscale Discussion	13
Special Weather Statement	8
Flooding
River Flood Warning	4
Areal Flood Advisory	2
Winter
Winter Storm Warning	2
Winter Storm Watch	4
Winter Weather Advisory	6
Cold
Freeze Warning	2
Wind Chill Warning	7
Frost Advisory	3
Wind Chill Advisory	17
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	3
Fire
Red Flag Warning	2
Fire Weather Watch	1
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 2018 2020

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.