Alert archive / North Dakota / McHenry County

Weather alerts in McHenry County, North Dakota, 2025

150 weather alerts in 2025, 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 2025. Tap one for its archive.

Alerts: 150
Warnings: 52
Watches: 15
Advisories: 53
Busiest month: July25 alerts
Busiest day: September 12, 202510 alerts

Over time

By month

Warning verification

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

4 of 4 tornado warnings covering McHenry County in 2025 had a tornado report inside them; 3 of 3 tornado reports fell inside a warning, on average 21 minutes after it went out.

McHenry County, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	4	0%	3	100%	21 min
Severe thunderstorm warnings	29	16	45%	24	79%	30 min
Flash flood warnings	0			0

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	59	32	46%	52	87%	16 min
NWS Bismarck, ND: severe thunderstorm warnings	280	160	43%	420	88%	26 min
NWS Bismarck, ND: flash flood warnings	3	1	67%	2	100%	16 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 2, 2:09 AM CST	Cold Weather Advisory	BIS	34 hr
Jan 3, 1:31 PM CST	Cold Weather Advisory	BIS	22 hr
Jan 4, 1:25 PM CST	Cold Weather Advisory	BIS	21 hr
Jan 12, 12:55 AM CST	Cold Weather Advisory	BIS	11 hr
Jan 12, 1:23 PM CST	Cold Weather Advisory	BIS	23 hr
Jan 13, 1:25 PM CST	Cold Weather Advisory	BIS	23 hr
Jan 16, 1:01 PM CST	Wind Advisory	BIS	29 hr
Jan 17, 10:01 AM CST	Winter Weather Advisory	BIS	10 hr
Jan 17, 2:27 PM CST	Extreme Cold Warning	BIS	4 days
Jan 28, 2:19 AM CST	Wind Advisory	BIS	16 hr
Feb 2, 3:17 AM CST	Cold Weather Advisory	BIS	57 hr
Feb 5, 1:19 PM CST	Cold Weather Advisory	BIS	23 hr
Feb 5, 1:41 PM CST	Winter Weather Advisory	BIS	26 hr
Feb 9, 1:28 PM CST	Cold Weather Advisory	BIS	29 hr
Feb 9, 1:28 PM CST	Extreme Cold Warning	BIS	47 hr
Feb 11, 11:39 AM CST	Extreme Cold Warning	BIS	48 hr
Feb 13, 2:01 PM CST	Cold Weather Advisory	BIS	22 hr
Feb 14, 2:14 PM CST	Cold Weather Advisory	BIS	19 hr
Feb 15, 2:01 AM CST	Extreme Cold Watch	BIS	23 hr
Feb 15, 2:39 PM CST	Cold Weather Advisory	BIS	27 hr
Feb 16, 1:22 AM CST	Extreme Cold Warning	BIS	3 days
Feb 19, 3:08 PM CST	Extreme Cold Warning	BIS	21 hr
Feb 27, 1:34 PM CST	Wind Advisory	BIS	28 hr
Mar 8, 1:17 PM CST	High Wind Watch	BIS	24 hr
Mar 9, 2:29 PM CDT	High Wind Warning	BIS	29 hr
Mar 13, 3:14 PM CDT	Wind Advisory	BIS	52 hr
Mar 27, 2:04 AM CDT	Winter Weather Advisory	BIS	43 hr
Apr 10, 2:27 PM CDT	Red Flag Warning	BIS	31 hr
Apr 28, 2:34 AM CDT	Wind Advisory	BIS	20 hr
May 3, 2:19 AM CDT	Fire Weather Watch	BIS	24 hr
May 4, 1:56 AM CDT	Red Flag Warning	BIS	19 hr
May 7, 3:11 PM CDT	Fire Weather Watch	BIS	11 hr
May 8, 2:11 AM CDT	Red Flag Warning	BIS	19 hr
May 9, 1:59 PM CDT	Red Flag Warning	BIS	31 hr
May 10, 1:18 PM CDT	Red Flag Warning	BIS	56 hr
May 10, 5:22 PM CDT	Special Weather Statement	BIS	23 min
May 11, 11:48 PM CDT	Mesoscale Discussion	SPC	57 min
May 14, 1:32 PM CDT	Wind Advisory	BIS	53 hr
May 16, 2:04 PM CDT	Frost Advisory	BIS	20 hr
May 17, 2:12 PM CDT	Frost Advisory	BIS	19 hr
May 21, 1:57 PM CDT	Frost Advisory	BIS	19 hr
Jun 7, 8:49 PM CDT	Wind Advisory	BIS	23 hr
Jun 15, 10:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 16, 6:09 PM CDT	Special Weather Statement	BIS	36 min
Jun 16, 6:41 PM CDT	Severe Thunderstorm Warning	BIS	64 min
Jun 18, 5:03 PM CDT	Mesoscale Discussion	SPC	117 min
Jun 18, 7:34 PM CDT	Special Weather Statement	BIS	26 min
Jun 18, 8:09 PM CDT	Special Weather Statement	BIS	51 min
Jun 18, 8:11 PM CDT	Severe Thunderstorm Warning	BIS	48 min
Jun 19, 6:38 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 20, 7:54 PM CDT	Tornado Watch	SPC	7 hr
Jun 20, 9:01 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	44 min
Jun 20, 9:44 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	61 min
Jun 27, 3:36 PM CDT	Mesoscale Discussion	SPC	114 min
Jun 27, 5:20 PM CDT	Tornado Watch	SPC	8 hr
Jun 27, 6:45 PM CDT	Severe Thunderstorm Warning	BIS	45 min
Jun 27, 7:17 PM CDT	Mesoscale Discussion	SPC	58 min
Jun 27, 7:18 PM CDT	Severe Thunderstorm Warning Destructive damage threat	BIS	57 min
Jun 27, 7:22 PM CDT	Severe Thunderstorm Warning	BIS	53 min
Jun 27, 7:34 PM CDT	Severe Thunderstorm Warning	BIS	41 min
Jun 27, 7:49 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Jun 27, 8:11 PM CDT	Severe Thunderstorm Warning	BIS	36 min
Jun 27, 8:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	62 min
Jun 27, 9:31 PM CDT	Severe Thunderstorm Warning	BIS	44 min
Jul 3, 7:06 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 1:14 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 4, 2:13 AM CDT	Special Weather Statement	BIS	32 min
Jul 8, 4:18 AM CDT	Dense Fog Advisory	BIS	6 hr
Jul 9, 5:01 AM CDT	Special Weather Statement	BIS	44 min
Jul 9, 5:25 AM CDT	Special Weather Statement	BIS	50 min
Jul 10, 6:55 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	50 min
Jul 19, 3:11 AM CDT	Dense Fog Advisory	BIS	7 hr
Jul 21, 5:37 AM CDT	Dense Fog Advisory	BIS	6 hr
Jul 25, 6:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 25, 7:39 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 25, 8:53 PM CDT	Mesoscale Discussion	SPC	67 min
Jul 25, 10:49 PM CDT	Special Weather Statement	BIS	26 min
Jul 25, 11:12 PM CDT	Severe Thunderstorm Warning	BIS	48 min
Jul 25, 11:24 PM CDT	Mesoscale Discussion	SPC	96 min
Jul 26, 1:03 AM CDT	Special Weather Statement	BIS	27 min
Jul 26, 1:29 AM CDT	Special Weather Statement	BIS	31 min
Jul 26, 11:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 27, 1:32 AM CDT	Severe Thunderstorm Warning	BIS	43 min
Jul 27, 2:09 AM CDT	Mesoscale Discussion	SPC	96 min
Jul 27, 2:10 AM CDT	Severe Thunderstorm Warning	BIS	65 min
Jul 27, 3:20 AM CDT	Areal Flood Advisory	BIS	4 hr
Jul 27, 4:21 AM CDT	Mesoscale Discussion	SPC	54 min
Jul 27, 4:34 AM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	56 min
Jul 27, 5:15 AM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	60 min
Aug 4, 3:48 AM CDT	Dense Fog Advisory	BIS	6 hr
Aug 7, 2:54 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 7:39 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 8:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 7, 9:54 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	66 min
Aug 7, 10:30 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 7, 10:58 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	62 min
Aug 8, 12:09 AM CDT	Severe Thunderstorm Warning	BIS	66 min
Aug 11, 4:38 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 18, 12:06 AM CDT	Dense Fog Advisory	BIS	9 hr
Aug 19, 4:39 AM CDT	Dense Fog Advisory	BIS	6 hr
Aug 22, 3:25 AM CDT	Wind Advisory	BIS	14 hr
Sep 3, 2:14 PM CDT	Wind Advisory	BIS	31 hr
Sep 5, 2:00 PM CDT	Frost Advisory	BIS	19 hr
Sep 6, 2:09 PM CDT	Frost Advisory	BIS	19 hr
Sep 11, 9:26 PM CDT	Special Weather Statement	BIS	34 min
Sep 11, 9:41 PM CDT	Severe Thunderstorm Warning	BIS	49 min
Sep 11, 10:11 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 11, 10:18 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Sep 11, 10:20 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	55 min
Sep 11, 11:01 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Sep 11, 11:46 PM CDT	Severe Thunderstorm Warning	BIS	44 min
Sep 12, 12:00 AM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	45 min
Sep 12, 12:29 AM CDT	Severe Thunderstorm Warning	BIS	61 min
Sep 12, 12:41 AM CDT	Areal Flood Advisory	BIS	4 hr
Sep 14, 12:41 PM CDT	Mesoscale Discussion	SPC	94 min
Sep 14, 1:07 PM CDT	Tornado Watch	SPC	8 hr
Sep 14, 4:10 PM CDT	Areal Flood Advisory	BIS	4 hr
Sep 14, 4:15 PM CDT	Severe Thunderstorm Warning	BIS	60 min
Sep 14, 5:09 PM CDT	Mesoscale Discussion	SPC	96 min
Sep 14, 5:10 PM CDT	Tornado Warning Tornado observed	BIS	50 min
Sep 14, 5:45 PM CDT	Areal Flood Advisory	BIS	5 hr
Sep 14, 5:58 PM CDT	Tornado Warning	BIS	32 min
Sep 14, 6:28 PM CDT	Tornado Warning Tornado observed	BIS	47 min
Sep 14, 6:58 PM CDT	Mesoscale Discussion	SPC	62 min
Sep 14, 7:04 PM CDT	Tornado Warning Tornado observed	BIS	41 min
Oct 5, 1:30 PM CDT	Freeze Warning	BIS	21 hr
Oct 6, 12:01 PM CDT	Freeze Warning	BIS	21 hr
Oct 9, 1:59 PM CDT	Freeze Warning	BIS	19 hr
Oct 11, 2:20 PM CDT	Wind Advisory	BIS	34 hr
Oct 12, 1:31 PM CDT	Freeze Warning	BIS	20 hr
Oct 13, 1:00 PM CDT	Freeze Warning	BIS	21 hr
Oct 18, 1:45 PM CDT	Freeze Warning	BIS	20 hr
Oct 19, 2:03 PM CDT	Wind Advisory	BIS	41 hr
Nov 2, 1:45 AM CST	Wind Advisory	BIS	16 hr
Nov 23, 1:46 PM CST	Winter Storm Watch	BIS	23 hr
Nov 24, 1:09 PM CST	Winter Weather Advisory	BIS	29 hr
Dec 7, 2:03 PM CST	High Wind Watch	BIS	24 hr
Dec 8, 1:33 PM CST	High Wind Warning	BIS	37 hr
Dec 8, 1:40 PM CST	Winter Weather Advisory	BIS	38 hr
Dec 9, 2:14 PM CST	Winter Weather Advisory	BIS	64 hr
Dec 11, 2:14 PM CST	Cold Weather Advisory	BIS	67 hr
Dec 15, 3:34 AM CST	Wind Advisory	BIS	38 hr
Dec 16, 4:37 AM CST	Winter Storm Watch	BIS	32 hr
Dec 17, 12:52 PM CST	Cold Weather Advisory	BIS	44 hr
Dec 17, 1:03 PM CST	Blizzard Warning	BIS	26 hr
Dec 19, 3:15 AM CST	Wind Advisory	BIS	24 hr
Dec 19, 3:27 AM CST	Winter Weather Advisory	BIS	11 hr
Dec 25, 4:30 PM CST	Winter Weather Advisory	BIS	8 hr
Dec 26, 3:27 PM CST	Dense Fog Advisory	BIS	32 hr
Dec 28, 2:21 PM CST	Cold Weather Advisory	BIS	19 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
Tornado Warning	4
Severe Thunderstorm Watch	5
Tornado Watch	3
Mesoscale Discussion	19
Special Weather Statement	11
Flooding
Areal Flood Advisory	4
Winter
Blizzard Warning	1
Winter Storm Watch	2
Winter Weather Advisory	8
Cold
Extreme Cold Warning	5
Freeze Warning	6
Extreme Cold Watch	1
Cold Weather Advisory	15
Frost Advisory	5
Wind and dust
High Wind Warning	2
High Wind Watch	2
Wind Advisory	14
Fire
Red Flag Warning	5
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 2024 2026

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.