Alert archive / North Dakota / McHenry County

Weather alerts in McHenry County, North Dakota, 2024

121 weather alerts in 2024, 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 2024. Tap one for its archive.

Alerts: 121
Warnings: 42
Watches: 15
Advisories: 41
Busiest month: July25 alerts
Busiest day: July 15, 20249 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, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	27	16	41%	15	93%	23 min
Flash flood warnings	0			0

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	17	4	76%	10	40%	11 min
NWS Bismarck, ND: severe thunderstorm warnings	212	149	30%	316	86%	24 min
NWS Bismarck, ND: flash flood warnings	6	2	67%	2	100%	39 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 10, 3:24 AM CST	Wind Chill Advisory	BIS	63 hr
Jan 12, 2:41 AM CST	Wind Chill Warning	BIS	3 days
Jan 12, 12:37 PM CST	Winter Weather Advisory	BIS	39 hr
Jan 15, 2:32 AM CST	Wind Chill Advisory	BIS	56 hr
Jan 17, 1:41 PM CST	Wind Chill Advisory	BIS	44 hr
Jan 19, 1:59 PM CST	Wind Chill Advisory	BIS	22 hr
Jan 24, 7:43 PM CST	Dense Fog Advisory	BIS	18 hr
Jan 25, 4:40 PM CST	Dense Fog Advisory	BIS	17 hr
Feb 1, 9:38 PM CST	Dense Fog Advisory	BIS	41 hr
Feb 3, 5:42 PM CST	Dense Fog Advisory	BIS	21 hr
Feb 4, 6:03 PM CST	Dense Fog Advisory	BIS	18 hr
Feb 6, 2:38 PM CST	Winter Weather Advisory	BIS	60 hr
Feb 16, 2:24 PM CST	Wind Advisory	BIS	28 hr
Mar 1, 1:44 PM CST	Winter Storm Watch	BIS	14 hr
Mar 2, 3:19 AM CST	Winter Storm Warning	BIS	48 hr
Mar 2, 3:19 AM CST	Winter Weather Advisory	BIS	55 hr
Mar 3, 11:01 AM CST	Mesoscale Discussion	SPC	4 hr
Mar 6, 1:00 AM CST	Winter Weather Advisory	BIS	17 hr
Mar 15, 3:47 AM CDT	Wind Advisory	BIS	17 hr
Mar 28, 8:06 PM CDT	Winter Weather Advisory	BIS	19 hr
Apr 4, 2:40 PM CDT	Fire Weather Watch	BIS	13 hr
Apr 5, 3:14 AM CDT	Red Flag Warning	BIS	16 hr
Apr 6, 3:00 AM CDT	Wind Advisory	BIS	17 hr
Apr 17, 9:43 PM CDT	Wind Advisory	BIS	23 hr
Apr 22, 2:33 AM CDT	Wind Advisory	BIS	18 hr
May 5, 2:09 PM CDT	Wind Advisory	BIS	31 hr
May 11, 4:56 PM CDT	Mesoscale Discussion	SPC	3 hr
May 17, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 17, 4:18 PM CDT	Special Weather Statement	BIS	27 min
May 17, 4:47 PM CDT	Severe Thunderstorm Warning	BIS	43 min
May 17, 5:04 PM CDT	Mesoscale Discussion	SPC	116 min
May 18, 2:20 AM CDT	Wind Advisory	BIS	17 hr
May 24, 2:40 PM CDT	Frost Advisory	BIS	17 hr
May 24, 8:47 PM CDT	Freeze Warning	BIS	11 hr
Jun 3, 3:52 AM CDT	Dense Fog Advisory	BIS	7 hr
Jun 4, 2:34 PM CDT	Wind Advisory	BIS	30 hr
Jun 5, 1:00 PM CDT	High Wind Warning	BIS	8 hr
Jun 6, 1:54 AM CDT	Wind Advisory	BIS	17 hr
Jun 15, 5:11 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 15, 7:55 PM CDT	Mesoscale Discussion	SPC	65 min
Jun 15, 8:10 PM CDT	Tornado Watch	SPC	6 hr
Jun 15, 11:31 PM CDT	Mesoscale Discussion	SPC	89 min
Jun 15, 11:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	54 min
Jun 16, 12:36 AM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	54 min
Jun 16, 2:51 AM CDT	Wind Advisory	BIS	16 hr
Jun 23, 11:57 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 24, 3:13 AM CDT	Mesoscale Discussion	SPC	92 min
Jun 27, 6:21 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 27, 7:01 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 28, 5:24 PM CDT	Mesoscale Discussion	SPC	96 min
Jul 12, 6:52 PM CDT	Mesoscale Discussion	SPC	113 min
Jul 12, 7:27 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Jul 12, 7:28 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 12, 8:12 PM CDT	Mesoscale Discussion	SPC	93 min
Jul 12, 8:30 PM CDT	Severe Thunderstorm Warning	BIS	60 min
Jul 13, 2:39 AM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	54 min
Jul 13, 6:37 AM CDT	Special Weather Statement	BIS	53 min
Jul 13, 8:39 AM CDT	Special Weather Statement	BIS	36 min
Jul 14, 4:59 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 14, 5:44 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	61 min
Jul 14, 7:40 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 14, 7:44 PM CDT	Severe Thunderstorm Warning	BIS	46 min
Jul 14, 8:25 PM CDT	Severe Thunderstorm Warning	BIS	65 min
Jul 14, 8:59 PM CDT	Severe Thunderstorm Warning	BIS	46 min
Jul 14, 9:21 PM CDT	Severe Thunderstorm Warning	BIS	39 min
Jul 14, 9:34 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Jul 14, 9:50 PM CDT	Mesoscale Discussion	SPC	115 min
Jul 14, 10:04 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Jul 14, 10:46 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	35 min
Jul 23, 3:13 AM CDT	Heat Advisory	BIS	66 hr
Jul 29, 4:26 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 30, 3:03 PM CDT	Mesoscale Discussion	SPC	117 min
Jul 30, 4:37 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 30, 7:09 PM CDT	Mesoscale Discussion	SPC	96 min
Jul 30, 7:45 PM CDT	Severe Thunderstorm Warning	BIS	45 min
Aug 6, 7:25 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 6, 7:39 PM CDT	Severe Thunderstorm Warning	BIS	51 min
Aug 6, 8:10 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	47 min
Aug 17, 3:34 AM CDT	Dense Fog Advisory	BIS	7 hr
Aug 22, 12:21 AM CDT	Severe Thunderstorm Warning	BIS	39 min
Aug 22, 12:59 AM CDT	Special Weather Statement	BIS	31 min
Aug 22, 1:28 AM CDT	Severe Thunderstorm Warning	BIS	47 min
Aug 29, 12:58 AM CDT	Severe Thunderstorm Warning	BIS	47 min
Aug 29, 1:54 AM CDT	Severe Thunderstorm Warning	BIS	24 min
Sep 11, 9:02 PM CDT	Wind Advisory	BIS	26 hr
Sep 16, 2:23 AM CDT	Severe Thunderstorm Warning	BIS	52 min
Sep 16, 3:02 AM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	58 min
Sep 16, 3:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 16, 6:39 PM CDT	Severe Thunderstorm Warning	BIS	51 min
Sep 16, 7:06 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Sep 16, 7:12 PM CDT	Severe Thunderstorm Warning	BIS	48 min
Sep 16, 7:35 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	55 min
Sep 16, 8:34 PM CDT	Special Weather Statement	BIS	26 min
Sep 16, 8:40 PM CDT	Severe Thunderstorm Warning	BIS	65 min
Sep 16, 9:10 PM CDT	Mesoscale Discussion	SPC	95 min
Sep 16, 9:38 PM CDT	Areal Flood Advisory	BIS	6 hr
Sep 17, 3:49 AM CDT	Dense Fog Advisory	BIS	7 hr
Sep 28, 3:16 AM CDT	Fire Weather Watch	BIS	11 hr
Sep 28, 2:29 PM CDT	Red Flag Warning	BIS	53 hr
Sep 29, 2:19 PM CDT	Wind Advisory	BIS	31 hr
Sep 30, 1:39 PM CDT	Frost Advisory	BIS	20 hr
Oct 3, 2:59 AM CDT	High Wind Watch	BIS	47 hr
Oct 3, 2:03 PM CDT	Freeze Warning	BIS	19 hr
Oct 4, 1:02 PM CDT	Red Flag Warning	BIS	32 hr
Oct 4, 1:46 PM CDT	High Wind Warning	BIS	34 hr
Oct 12, 2:55 PM CDT	Freeze Warning	BIS	19 hr
Oct 13, 12:44 PM CDT	Freeze Warning	BIS	21 hr
Oct 14, 11:28 AM CDT	Freeze Warning	BIS	23 hr
Nov 2, 1:47 AM CDT	Dense Fog Advisory	BIS	10 hr
Nov 18, 3:01 AM CST	Winter Storm Watch	BIS	12 hr
Nov 18, 2:41 PM CST	Winter Storm Warning	BIS	43 hr
Nov 20, 9:33 AM CST	Blizzard Warning	BIS	8 hr
Nov 29, 1:34 PM CST	Cold Weather Advisory	BIS	20 hr
Dec 3, 1:30 PM CST	Winter Weather Advisory	BIS	29 hr
Dec 7, 1:45 PM CST	Winter Weather Advisory	BIS	19 hr
Dec 17, 2:07 PM CST	Winter Storm Watch	BIS	20 hr
Dec 18, 9:57 AM CST	Winter Storm Warning	BIS	32 hr
Dec 21, 2:14 PM CST	Winter Weather Advisory	BIS	38 hr
Dec 23, 1:14 AM CST	Dense Fog Advisory	BIS	32 hr
Dec 24, 2:42 PM CST	Dense Fog Advisory	BIS	21 hr
Dec 29, 8:09 PM CST	Dense Fog Advisory	BIS	7 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	27
Severe Thunderstorm Watch	8
Tornado Watch	1
Mesoscale Discussion	18
Special Weather Statement	5
Flooding
Areal Flood Advisory	1
Winter
Blizzard Warning	1
Winter Storm Warning	3
Winter Storm Watch	3
Winter Weather Advisory	8
Heat
Heat Advisory	1
Cold
Freeze Warning	5
Wind Chill Warning	1
Cold Weather Advisory	1
Frost Advisory	2
Wind Chill Advisory	4
Wind and dust
High Wind Warning	2
High Wind Watch	1
Wind Advisory	12
Fire
Red Flag Warning	3
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	12

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2023 2025

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.