Alert archive / North Dakota / McHenry County

Weather alerts in McHenry County, North Dakota, 2020

126 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

McHenry County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts: 126
Warnings: 39
Watches: 14
Advisories: 42
Busiest month: June27 alerts
Busiest day: July 17, 202014 alerts

Over time

By month

Warning verification

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

McHenry County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	29	19	34%	8	88%	24 min
Flash flood warnings	0			0

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	18	4	78%	13	31%	6 min
NWS Bismarck, ND: severe thunderstorm warnings	291	171	41%	339	83%	25 min
NWS Bismarck, ND: flash flood warnings	1	0	100%	0

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 3, 2:50 PM CST	High Wind Watch	BIS	24 hr
Jan 4, 2:45 PM CST	Wind Advisory	BIS	21 hr
Jan 8, 2:34 AM CST	Winter Weather Advisory	BIS	22 hr
Jan 9, 1:29 PM CST	Wind Chill Advisory	BIS	23 hr
Jan 10, 1:43 PM CST	Wind Chill Advisory	BIS	22 hr
Jan 13, 2:51 PM CST	Wind Chill Advisory	BIS	3 days
Jan 14, 6:00 PM CST	Wind Chill Advisory	BIS	45 hr
Jan 15, 9:12 PM CST	Wind Chill Warning	BIS	18 hr
Jan 16, 3:45 PM CST	Wind Chill Advisory	BIS	14 hr
Jan 17, 4:05 AM CST	Wind Chill Advisory	BIS	56 hr
Jan 17, 4:05 AM CST	Winter Weather Advisory	BIS	32 hr
Jan 19, 2:50 PM CST	Wind Chill Advisory	BIS	19 hr
Jan 23, 6:14 PM CST	Dense Fog Advisory	BIS	21 hr
Jan 25, 10:41 PM CST	Winter Weather Advisory	BIS	7 hr
Jan 26, 6:17 AM CST	Winter Weather Advisory	BIS	15 hr
Jan 28, 9:07 PM CST	Dense Fog Advisory	BIS	15 hr
Feb 1, 1:28 PM CST	High Wind Warning	BIS	16 hr
Feb 1, 1:28 PM CST	Wind Advisory	BIS	21 hr
Feb 11, 3:37 AM CST	Winter Weather Advisory	BIS	31 hr
Feb 12, 3:12 AM CST	Wind Chill Advisory	BIS	33 hr
Feb 18, 2:51 PM CST	Wind Chill Advisory	BIS	19 hr
Feb 29, 2:37 PM CST	Wind Advisory	BIS	27 hr
Mar 1, 7:43 AM CST	High Wind Warning	BIS	4 hr
Mar 1, 7:43 AM CST	Wind Advisory	BIS	10 hr
Mar 4, 2:24 PM CST	Wind Advisory	BIS	22 hr
Apr 1, 4:04 AM CDT	Winter Weather Advisory	BIS	54 hr
Apr 8, 3:00 AM CDT	Wind Advisory	BIS	17 hr
Apr 19, 5:07 AM CDT	Red Flag Warning	BIS	15 hr
May 8, 4:14 AM CDT	Winter Weather Advisory	BIS	32 hr
May 23, 3:35 PM CDT	Mesoscale Discussion	SPC	115 min
Jun 6, 10:05 AM CDT	Wind Advisory	BIS	10 hr
Jun 6, 8:29 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 6, 9:11 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 7, 12:11 AM CDT	Severe Thunderstorm Warning	BIS	49 min
Jun 7, 12:39 AM CDT	Severe Thunderstorm Warning	BIS	32 min
Jun 14, 2:20 PM CDT	Mesoscale Discussion	SPC	115 min
Jun 14, 3:20 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 14, 6:19 PM CDT	Mesoscale Discussion	SPC	116 min
Jun 16, 6:55 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 16, 10:27 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 17, 12:49 AM CDT	Severe Thunderstorm Warning	BIS	56 min
Jun 28, 1:54 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 28, 3:09 PM CDT	Tornado Watch	SPC	7 hr
Jun 28, 3:46 PM CDT	Severe Thunderstorm Warning	BIS	44 min
Jun 28, 3:53 PM CDT	Severe Thunderstorm Warning	BIS	37 min
Jun 28, 4:27 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Jun 28, 4:48 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Jun 28, 5:23 PM CDT	Severe Thunderstorm Warning	BIS	67 min
Jun 28, 6:53 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 29, 4:39 AM CDT	Heat Advisory	BIS	15 hr
Jun 29, 2:43 PM CDT	Flash Flood Watch	BIS	31 hr
Jun 29, 9:42 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 29, 11:01 PM CDT	Special Weather Statement	BIS	44 min
Jun 29, 11:45 PM CDT	Special Weather Statement	BIS	45 min
Jun 30, 10:06 AM CDT	Special Weather Statement	BIS	39 min
Jun 30, 10:44 AM CDT	Special Weather Statement	BIS	46 min
Jun 30, 2:38 PM CDT	Severe Thunderstorm Warning	BIS	52 min
Jul 2, 5:13 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 2, 7:19 PM CDT	Severe Thunderstorm Warning	BIS	41 min
Jul 2, 7:28 PM CDT	Severe Thunderstorm Warning	BIS	27 min
Jul 2, 7:36 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 7, 7:59 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 7, 11:09 PM CDT	Mesoscale Discussion	SPC	66 min
Jul 7, 11:12 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Jul 8, 12:14 AM CDT	Severe Thunderstorm Warning	BIS	61 min
Jul 12, 10:55 PM CDT	Severe Thunderstorm Warning	BIS	20 min
Jul 13, 1:40 AM CDT	Severe Thunderstorm Warning	BIS	41 min
Jul 17, 12:10 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 17, 12:30 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 17, 1:17 PM CDT	Severe Thunderstorm Warning	BIS	58 min
Jul 17, 2:03 PM CDT	Severe Thunderstorm Warning	BIS	57 min
Jul 17, 2:06 PM CDT	Severe Thunderstorm Warning	BIS	54 min
Jul 17, 2:25 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 17, 2:58 PM CDT	Severe Thunderstorm Warning	BIS	47 min
Jul 17, 3:42 PM CDT	Severe Thunderstorm Warning	BIS	48 min
Jul 17, 4:10 PM CDT	Special Weather Statement	BIS	50 min
Jul 17, 4:48 PM CDT	Severe Thunderstorm Warning	BIS	57 min
Jul 17, 5:20 PM CDT	Severe Thunderstorm Warning	BIS	25 min
Jul 17, 5:44 PM CDT	Severe Thunderstorm Warning	BIS	61 min
Jul 17, 6:01 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Jul 17, 6:04 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 18, 1:16 PM CDT	Mesoscale Discussion	SPC	119 min
Jul 24, 2:13 AM CDT	Severe Thunderstorm Warning	BIS	62 min
Jul 25, 3:21 PM CDT	Mesoscale Discussion	SPC	114 min
Aug 4, 7:18 PM CDT	Mesoscale Discussion	SPC	117 min
Aug 4, 7:21 PM CDT	Special Weather Statement	BIS	39 min
Aug 4, 8:38 PM CDT	Special Weather Statement	BIS	37 min
Aug 4, 9:11 PM CDT	Special Weather Statement	BIS	34 min
Aug 7, 6:09 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 9:33 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Aug 9, 5:13 AM CDT	Special Weather Statement	BIS	47 min
Aug 9, 5:47 AM CDT	Severe Thunderstorm Warning	BIS	43 min
Aug 12, 6:16 PM CDT	Mesoscale Discussion	SPC	119 min
Aug 14, 6:19 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Aug 14, 6:34 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Aug 31, 3:56 AM CDT	Fire Weather Watch	BIS	11 hr
Aug 31, 2:29 PM CDT	Red Flag Warning	BIS	30 hr
Sep 1, 5:16 AM CDT	Wind Advisory	BIS	15 hr
Sep 1, 2:44 PM CDT	Wind Advisory	BIS	33 hr
Sep 6, 3:00 AM CDT	Freeze Watch	BIS	24 hr
Sep 6, 3:00 AM CDT	Wind Advisory	BIS	17 hr
Sep 7, 2:51 AM CDT	Freeze Watch	BIS	36 hr
Sep 7, 2:51 AM CDT	Freeze Warning	BIS	30 hr
Sep 8, 2:32 PM CDT	Freeze Warning	BIS	18 hr
Sep 24, 5:15 AM CDT	Dense Fog Advisory	BIS	5 hr
Sep 29, 2:20 PM CDT	Wind Advisory	BIS	30 hr
Oct 5, 2:35 PM CDT	Fire Weather Watch	BIS	13 hr
Oct 6, 3:21 AM CDT	Wind Advisory	BIS	12 hr
Oct 6, 3:51 AM CDT	Red Flag Warning	BIS	12 hr
Oct 16, 2:58 AM CDT	Winter Weather Advisory	BIS	31 hr
Oct 27, 11:55 AM CDT	Special Weather Statement	BIS	50 min
Oct 27, 1:03 PM CDT	Special Weather Statement	BIS	57 min
Oct 30, 4:04 AM CDT	Dense Fog Advisory	BIS	7 hr
Oct 30, 4:04 AM CDT	High Wind Watch	BIS	10 hr
Oct 30, 2:13 PM CDT	Wind Advisory	BIS	31 hr
Oct 31, 10:25 AM CDT	High Wind Warning	BIS	11 hr
Nov 7, 2:34 PM CST	Wind Advisory	BIS	33 hr
Nov 7, 9:07 PM CST	Dense Fog Advisory	BIS	17 hr
Nov 17, 2:38 AM CST	Special Weather Statement	BIS	52 min
Nov 18, 2:47 PM CST	Winter Weather Advisory	BIS	27 hr
Dec 11, 2:02 AM CST	Dense Fog Advisory	BIS	12 hr
Dec 11, 8:25 PM CST	Dense Fog Advisory	BIS	16 hr
Dec 21, 3:43 PM CST	Winter Storm Watch	BIS	24 hr
Dec 22, 4:20 AM CST	High Wind Warning	BIS	32 hr
Dec 23, 6:26 AM CST	Wind Chill Advisory	BIS	6 hr
Dec 23, 2:56 PM CST	Wind Chill Advisory	BIS	21 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	29
Severe Thunderstorm Watch	5
Tornado Watch	1
Mesoscale Discussion	19
Special Weather Statement	12
Flooding
Flash Flood Watch	1
Winter
Winter Storm Watch	1
Winter Weather Advisory	9
Heat
Heat Advisory	1
Cold
Freeze Warning	2
Wind Chill Warning	1
Freeze Watch	2
Wind Chill Advisory	11
Wind and dust
High Wind Warning	4
High Wind Watch	2
Wind Advisory	14
Fire
Red Flag Warning	3
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	7

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2019 2021

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.