Alert archive / North Dakota / McHenry County

Weather alerts in McHenry County, North Dakota, 2023

90 weather alerts in 2023, 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 2023. Tap one for its archive.

Alerts: 90
Warnings: 27
Watches: 10
Advisories: 36
Busiest month: August22 alerts
Busiest day: August 24, 202311 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 2 tornado warnings covering McHenry County in 2023 had a tornado report inside them; 0 of 2 tornado reports fell inside a warning.

McHenry County, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	2	0%
Severe thunderstorm warnings	13	6	54%	3	67%	12 min
Flash flood warnings	0			0

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	4	1	75%	4	25%	11 min
NWS Bismarck, ND: severe thunderstorm warnings	132	89	33%	203	86%	26 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, 2:06 AM CST	Dense Fog Advisory	BIS	34 hr
Jan 4, 12:27 AM CST	Dense Fog Advisory	BIS	14 hr
Jan 15, 6:18 AM CST	Dense Fog Advisory	BIS	33 hr
Jan 16, 10:34 AM CST	Winter Weather Advisory	BIS	25 hr
Jan 18, 9:15 PM CST	Dense Fog Advisory	BIS	36 hr
Jan 21, 10:48 PM CST	Dense Fog Advisory	BIS	13 hr
Jan 25, 4:06 AM CST	Wind Advisory	BIS	51 hr
Jan 27, 1:01 PM CST	Wind Chill Advisory	BIS	71 hr
Jan 28, 1:27 PM CST	Wind Chill Warning	BIS	46 hr
Jan 30, 11:25 AM CST	Wind Chill Advisory	BIS	25 hr
Feb 1, 1:45 PM CST	Wind Chill Advisory	BIS	46 hr
Feb 2, 2:38 AM CST	Wind Chill Warning	BIS	9 hr
Feb 14, 3:28 AM CST	Winter Weather Advisory	BIS	29 hr
Feb 19, 2:39 AM CST	Winter Weather Advisory	BIS	42 hr
Feb 21, 1:58 PM CST	Wind Chill Warning	BIS	46 hr
Feb 21, 1:58 PM CST	Wind Chill Advisory	BIS	4 days
Mar 9, 10:14 AM CST	Winter Storm Watch	BIS	16 hr
Mar 10, 2:43 AM CST	Blizzard Warning	BIS	47 hr
Mar 10, 8:41 PM CST	Winter Weather Advisory	BIS	38 hr
Mar 10, 11:08 PM CST	Mesoscale Discussion	SPC	5 hr
Mar 11, 4:41 AM CST	Mesoscale Discussion	SPC	6 hr
Mar 17, 3:37 AM CDT	Winter Weather Advisory	BIS	17 hr
Mar 17, 2:33 PM CDT	Wind Chill Advisory	BIS	20 hr
Mar 23, 6:42 AM CDT	Dense Fog Advisory	BIS	5 hr
Apr 2, 3:22 AM CDT	Winter Storm Watch	BIS	33 hr
Apr 3, 4:05 AM CDT	Blizzard Warning	BIS	68 hr
Apr 5, 1:02 PM CDT	Mesoscale Discussion	SPC	4 hr
Apr 13, 9:25 PM CDT	River Flood Warning	BIS	71 hr
Apr 14, 12:53 PM CDT	Areal Flood Warning	BIS	6 days
Apr 16, 11:22 AM CDT	River Flood Warning	BIS	49 days
Apr 16, 11:30 AM CDT	River Flood Warning	BIS	51 days
Apr 20, 3:07 AM CDT	Winter Weather Advisory	BIS	42 hr
May 18, 2:39 PM CDT	Frost Advisory	BIS	18 hr
May 28, 6:20 PM CDT	Special Weather Statement	BIS	25 min
Jun 2, 4:23 PM CDT	Special Weather Statement	BIS	37 min
Jun 8, 1:49 PM CDT	Mesoscale Discussion	SPC	116 min
Jun 8, 7:11 PM CDT	Special Weather Statement	BIS	34 min
Jun 8, 7:44 PM CDT	Special Weather Statement	BIS	31 min
Jun 19, 9:26 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 20, 3:14 PM CDT	Mesoscale Discussion	SPC	91 min
Jun 20, 4:52 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 20, 8:15 PM CDT	Special Weather Statement	BIS	30 min
Jun 20, 8:21 PM CDT	Severe Thunderstorm Warning	BIS	25 min
Jun 20, 8:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	66 min
Jun 20, 8:51 PM CDT	Severe Thunderstorm Warning	BIS	39 min
Jun 27, 11:15 PM CDT	Areal Flood Advisory	BIS	5 hr
Jul 8, 4:55 PM CDT	Special Weather Statement	BIS	35 min
Jul 31, 5:11 PM CDT	Mesoscale Discussion	SPC	94 min
Jul 31, 6:19 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	56 min
Jul 31, 7:06 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 31, 7:14 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	46 min
Jul 31, 7:59 PM CDT	Severe Thunderstorm Warning	BIS	46 min
Jul 31, 8:42 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	63 min
Jul 31, 8:48 PM CDT	Mesoscale Discussion	SPC	87 min
Aug 10, 7:31 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	44 min
Aug 10, 8:30 PM CDT	Severe Thunderstorm Warning	BIS	30 min
Aug 16, 3:14 AM CDT	Wind Advisory	BIS	18 hr
Aug 23, 3:43 PM CDT	Mesoscale Discussion	SPC	3 hr
Aug 23, 4:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 23, 7:57 PM CDT	Severe Thunderstorm Warning	BIS	48 min
Aug 23, 8:43 PM CDT	Severe Thunderstorm Warning	BIS	27 min
Aug 24, 2:22 AM CDT	Dense Fog Advisory	BIS	8 hr
Aug 24, 1:20 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 24, 2:41 PM CDT	Tornado Warning	BIS	34 min
Aug 24, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 24, 2:50 PM CDT	Special Weather Statement	BIS	25 min
Aug 24, 2:55 PM CDT	Tornado Warning Tornado observed	BIS	14 min
Aug 24, 4:09 PM CDT	Severe Thunderstorm Warning	BIS	51 min
Aug 24, 4:52 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Aug 24, 5:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 26, 5:53 AM CDT	Dense Fog Advisory	BIS	5 hr
Sep 16, 6:18 AM CDT	Dense Fog Advisory	BIS	5 hr
Sep 25, 4:23 AM CDT	Dense Fog Advisory	BIS	8 hr
Oct 1, 9:50 PM CDT	Dense Fog Advisory	BIS	11 hr
Oct 4, 2:15 PM CDT	Freeze Watch	BIS	24 hr
Oct 5, 1:22 PM CDT	Wind Advisory	BIS	21 hr
Oct 5, 2:31 PM CDT	Freeze Watch	BIS	20 hr
Oct 6, 10:03 AM CDT	Freeze Warning	BIS	23 hr
Oct 9, 6:16 AM CDT	Dense Fog Advisory	BIS	5 hr
Oct 23, 11:34 AM CDT	Winter Storm Watch	BIS	49 hr
Oct 24, 4:17 PM CDT	Winter Storm Warning	BIS	61 hr
Oct 30, 3:28 PM CDT	Snow Squall Warning	BIS	32 min
Nov 7, 1:20 AM CST	Dense Fog Advisory	BIS	11 hr
Nov 8, 1:45 AM CST	Wind Advisory	BIS	16 hr
Nov 25, 3:42 AM CST	Wind Advisory	BIS	32 hr
Dec 4, 11:34 PM CST	Dense Fog Advisory	BIS	11 hr
Dec 7, 4:25 AM CST	Winter Weather Advisory	BIS	56 hr
Dec 17, 9:32 AM CST	Wind Advisory	BIS	10 hr
Dec 22, 4:26 AM CST	Dense Fog Advisory	BIS	19 hr
Dec 31, 12:07 AM CST	Dense Fog Advisory	BIS	13 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	13
Tornado Warning	2
Severe Thunderstorm Watch	5
Mesoscale Discussion	10
Special Weather Statement	7
Flooding
Areal Flood Warning	1
River Flood Warning	3
Areal Flood Advisory	1
Winter
Blizzard Warning	2
Snow Squall Warning	1
Winter Storm Warning	1
Winter Storm Watch	3
Winter Weather Advisory	7
Cold
Freeze Warning	1
Wind Chill Warning	3
Freeze Watch	2
Frost Advisory	1
Wind Chill Advisory	5
Wind and dust
Wind Advisory	6
Fog and smoke
Dense Fog Advisory	16

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2022 2024

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.