Alert archive / North Dakota / McHenry County

Weather alerts in McHenry County, North Dakota, 2010

199 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts: 199
Warnings: 60
Watches: 36
Advisories: 65
Busiest month: July41 alerts
Busiest day: June 17, 201013 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 2010 had a tornado report inside them.

McHenry County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	0
Severe thunderstorm warnings	28	11	61%	15	60%	28 min
Flash flood warnings	3	2	33%	1	0%

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	93	10	89%	30	63%	9 min
NWS Bismarck, ND: severe thunderstorm warnings	430	186	57%	406	74%	25 min
NWS Bismarck, ND: flash flood warnings	29	8	72%	23	57%	83 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 1, 4:10 PM CST	Wind Chill Advisory	BIS	20 hr
Jan 4, 3:46 PM CST	Winter Weather Advisory	BIS	53 hr
Jan 6, 4:46 AM CST	Wind Chill Warning	BIS	55 hr
Jan 8, 3:36 PM CST	Wind Chill Advisory	BIS	20 hr
Jan 11, 4:19 AM CST	Freezing Fog Advisory	BIS	8 hr
Jan 17, 11:47 PM CST	Freezing Fog Advisory	BIS	13 hr
Jan 20, 3:54 AM CST	Winter Weather Advisory	BIS	17 hr
Jan 20, 4:27 PM CST	Winter Storm Watch	BIS	25 hr
Jan 21, 5:20 PM CST	Winter Storm Warning	BIS	3 days
Jan 22, 4:26 AM CST	Winter Weather Advisory	BIS	8 hr
Jan 24, 10:51 AM CST	Blizzard Warning	BIS	34 hr
Jan 24, 4:01 PM CST	Winter Weather Advisory	BIS	18 hr
Jan 25, 4:14 PM CST	Winter Weather Advisory	BIS	12 hr
Jan 26, 3:56 AM CST	Wind Chill Advisory	BIS	7 hr
Jan 26, 2:44 PM CST	Wind Chill Advisory	BIS	20 hr
Jan 27, 3:36 PM CST	Wind Chill Advisory	BIS	18 hr
Jan 30, 3:42 PM CST	Wind Chill Advisory	BIS	6 hr
Feb 4, 5:14 AM CST	Winter Weather Advisory	BIS	56 hr
Feb 6, 3:59 PM CST	Winter Weather Advisory	BIS	53 hr
Feb 12, 3:41 PM CST	Winter Weather Advisory	BIS	50 hr
Feb 13, 11:45 AM CST	Winter Storm Warning	BIS	10 hr
Feb 23, 3:10 PM CST	Wind Chill Advisory	BIS	19 hr
Feb 26, 10:51 PM CST	Dense Fog Advisory	BIS	11 hr
Mar 1, 3:39 PM CST	Dense Fog Advisory	BIS	68 hr
Mar 4, 7:15 PM CST	Dense Fog Advisory	BIS	17 hr
Mar 5, 3:59 AM CST	Freezing Rain Advisory	BIS	41 hr
Mar 5, 11:54 AM CST	Dense Fog Advisory	BIS	28 hr
Mar 7, 12:44 AM CST	Dense Fog Advisory	BIS	10 hr
Mar 7, 9:20 PM CST	Dense Fog Advisory	BIS	48 hr
Mar 13, 2:15 AM CST	Dense Fog Advisory	BIS	10 hr
Mar 13, 3:29 PM CST	Dense Fog Advisory	BIS	21 hr
Mar 23, 8:46 PM CDT	River Flood Watch	BIS	3 days
Mar 23, 9:41 PM CDT	River Flood Warning	BIS	20 days
Mar 28, 9:35 PM CDT	River Flood Warning	BIS	13 days
Mar 31, 12:11 PM CDT	River Flood Warning	BIS	12 days
Mar 31, 4:13 PM CDT	Winter Storm Watch	BIS	24 hr
Apr 1, 3:43 PM CDT	Winter Weather Advisory	BIS	33 hr
Apr 2, 9:16 PM CDT	River Flood Warning	BIS	63 hr
Apr 7, 3:47 PM CDT	Fire Weather Watch	BIS	23 hr
Apr 8, 3:00 PM CDT	Red Flag Warning	BIS	30 hr
Apr 9, 3:35 AM CDT	Wind Advisory	BIS	15 hr
Apr 9, 4:12 PM CDT	Fire Weather Watch	BIS	12 hr
Apr 10, 4:17 AM CDT	Red Flag Warning	BIS	16 hr
Apr 10, 10:58 AM CDT	Wind Advisory	BIS	10 hr
Apr 12, 3:22 PM CDT	Wind Advisory	BIS	30 hr
Apr 13, 2:13 AM CDT	Severe Thunderstorm Warning	BIS	62 min
Apr 13, 12:48 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 14, 3:30 AM CDT	Wind Advisory	BIS	17 hr
Apr 16, 4:25 AM CDT	Fire Weather Watch	BIS	24 hr
Apr 27, 3:37 PM CDT	Wind Advisory	BIS	29 hr
May 3, 4:43 AM CDT	High Wind Watch	BIS	22 hr
May 3, 4:28 PM CDT	Wind Advisory	BIS	45 hr
May 5, 4:45 PM CDT	Winter Weather Advisory	BIS	47 hr
May 7, 4:54 AM CDT	Freeze Watch	BIS	11 hr
May 7, 3:39 PM CDT	Freeze Warning	BIS	17 hr
May 8, 4:22 PM CDT	Freeze Warning	BIS	15 hr
May 13, 9:04 PM CDT	Frost Advisory	BIS	12 hr
May 22, 1:06 PM CDT	Areal Flood Advisory	BIS	3 hr
May 22, 1:51 PM CDT	Severe Thunderstorm Warning	BIS	54 min
May 24, 2:47 AM CDT	High Wind Watch	BIS	23 hr
May 24, 2:47 AM CDT	Wind Advisory	BIS	23 hr
May 24, 10:05 PM CDT	Severe Thunderstorm Warning	BIS	33 min
May 25, 1:37 AM CDT	High Wind Warning	BIS	17 hr
May 27, 9:16 AM CDT	Flash Flood Warning	BIS	3 hr
May 27, 4:27 PM CDT	Flash Flood Watch	BIS	60 hr
May 28, 6:11 PM CDT	Mesoscale Discussion	SPC	94 min
May 31, 5:50 PM CDT	River Flood Warning	BIS	4 days
Jun 16, 4:55 AM CDT	High Wind Watch	BIS	24 hr
Jun 16, 3:00 PM CDT	Flash Flood Watch	BIS	30 hr
Jun 16, 7:20 PM CDT	Tornado Watch	SPC	8 hr
Jun 17, 2:05 AM CDT	Mesoscale Discussion	SPC	55 min
Jun 17, 4:55 AM CDT	Wind Advisory	BIS	38 hr
Jun 17, 12:04 PM CDT	Mesoscale Discussion	SPC	56 min
Jun 17, 12:21 PM CDT	Tornado Watch	SPC	9 hr
Jun 17, 2:18 PM CDT	Mesoscale Discussion	SPC	57 min
Jun 17, 3:33 PM CDT	Severe Thunderstorm Warning	BIS	57 min
Jun 17, 3:54 PM CDT	Areal Flood Advisory	BIS	4 hr
Jun 17, 4:01 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Jun 17, 4:06 PM CDT	Flash Flood Warning	BIS	117 min
Jun 17, 4:08 PM CDT	Severe Thunderstorm Warning	BIS	52 min
Jun 17, 4:32 PM CDT	Severe Thunderstorm Warning	BIS	28 min
Jun 17, 4:44 PM CDT	Areal Flood Advisory	BIS	4 hr
Jun 20, 12:18 PM CDT	River Flood Warning	BIS	15 days
Jun 21, 2:22 AM CDT	Flash Flood Watch	BIS	26 hr
Jun 21, 4:00 AM CDT	Severe Thunderstorm Warning	BIS	33 min
Jun 21, 5:13 AM CDT	Areal Flood Advisory	BIS	10 hr
Jun 21, 11:54 AM CDT	River Flood Warning	BIS	10 days
Jun 23, 11:30 AM CDT	River Flood Warning	BIS	21 days
Jun 24, 1:36 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 24, 6:25 PM CDT	Mesoscale Discussion	SPC	95 min
Jun 24, 7:23 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 24, 8:49 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 24, 10:35 PM CDT	Mesoscale Discussion	SPC	85 min
Jun 24, 10:43 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Jun 24, 11:43 PM CDT	Severe Thunderstorm Warning	BIS	47 min
Jun 25, 8:27 PM CDT	Flash Flood Watch	BIS	25 hr
Jun 26, 2:26 PM CDT	Mesoscale Discussion	SPC	64 min
Jun 26, 3:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 26, 5:52 PM CDT	Mesoscale Discussion	SPC	113 min
Jun 30, 11:34 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 1, 1:06 AM CDT	Severe Thunderstorm Warning	BIS	54 min
Jul 1, 1:19 AM CDT	Mesoscale Discussion	SPC	86 min
Jul 1, 1:59 AM CDT	Severe Thunderstorm Warning	BIS	61 min
Jul 1, 2:55 AM CDT	Severe Thunderstorm Warning	BIS	65 min
Jul 3, 1:43 AM CDT	Mesoscale Discussion	SPC	3 hr
Jul 5, 2:51 PM CDT	Mesoscale Discussion	SPC	54 min
Jul 5, 5:03 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Jul 10, 2:46 PM CDT	Mesoscale Discussion	SPC	119 min
Jul 12, 8:38 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 12, 11:13 PM CDT	Mesoscale Discussion	SPC	62 min
Jul 13, 2:26 AM CDT	Mesoscale Discussion	SPC	94 min
Jul 13, 10:36 PM CDT	Mesoscale Discussion	SPC	24 min
Jul 14, 3:00 AM CDT	Mesoscale Discussion	SPC	90 min
Jul 20, 2:12 PM CDT	Mesoscale Discussion	SPC	63 min
Jul 20, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 20, 6:13 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Jul 20, 6:23 PM CDT	Severe Thunderstorm Warning	BIS	67 min
Jul 20, 7:02 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 23, 4:27 AM CDT	Dense Fog Advisory	BIS	5 hr
Jul 26, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 26, 6:49 PM CDT	Severe Thunderstorm Warning	BIS	45 min
Jul 26, 6:50 PM CDT	Mesoscale Discussion	SPC	55 min
Jul 26, 7:09 PM CDT	Tornado Watch	SPC	6 hr
Jul 26, 7:32 PM CDT	Tornado Warning	BIS	43 min
Jul 26, 7:56 PM CDT	Severe Thunderstorm Warning	BIS	49 min
Jul 26, 8:16 PM CDT	Tornado Warning	BIS	44 min
Jul 26, 8:24 PM CDT	Severe Thunderstorm Warning	BIS	22 min
Jul 26, 8:34 PM CDT	Areal Flood Advisory	BIS	3 hr
Jul 26, 8:43 PM CDT	Severe Thunderstorm Warning	BIS	32 min
Jul 26, 8:53 PM CDT	Severe Thunderstorm Warning	BIS	22 min
Jul 26, 9:32 PM CDT	Flash Flood Warning	BIS	3 hr
Jul 26, 9:49 PM CDT	Severe Thunderstorm Warning	BIS	26 min
Jul 29, 4:38 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 29, 6:49 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 29, 9:31 PM CDT	Mesoscale Discussion	SPC	59 min
Jul 29, 10:46 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Jul 29, 11:46 PM CDT	Mesoscale Discussion	SPC	59 min
Jul 30, 3:51 PM CDT	Mesoscale Discussion	SPC	54 min
Jul 31, 1:01 PM CDT	Mesoscale Discussion	SPC	89 min
Jul 31, 5:38 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 31, 9:15 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 3:39 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 1, 6:37 PM CDT	Mesoscale Discussion	SPC	113 min
Aug 1, 9:43 PM CDT	Mesoscale Discussion	SPC	62 min
Aug 7, 2:22 AM CDT	Mesoscale Discussion	SPC	113 min
Aug 9, 3:57 PM CDT	Mesoscale Discussion	SPC	63 min
Aug 9, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 9, 7:23 PM CDT	Mesoscale Discussion	SPC	67 min
Aug 9, 11:43 PM CDT	Mesoscale Discussion	SPC	62 min
Aug 10, 12:39 PM CDT	Areal Flood Advisory	BIS	3 hr
Aug 10, 1:54 PM CDT	Areal Flood Advisory	BIS	3 hr
Aug 10, 2:32 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Aug 11, 3:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 11, 5:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 12, 12:17 AM CDT	Severe Thunderstorm Warning	BIS	58 min
Aug 12, 12:39 AM CDT	Severe Thunderstorm Warning	BIS	66 min
Aug 12, 12:42 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 12, 1:10 AM CDT	Severe Thunderstorm Warning	BIS	50 min
Aug 12, 1:16 AM CDT	Severe Thunderstorm Warning	BIS	59 min
Aug 13, 1:08 AM CDT	Mesoscale Discussion	SPC	67 min
Aug 30, 1:19 PM CDT	Mesoscale Discussion	SPC	56 min
Sep 1, 3:15 PM CDT	Wind Advisory	BIS	28 hr
Sep 16, 4:40 AM CDT	Freeze Watch	BIS	35 hr
Sep 17, 3:57 PM CDT	Freeze Warning	BIS	17 hr
Oct 1, 4:17 AM CDT	Freeze Watch	BIS	11 hr
Oct 1, 3:29 PM CDT	Freeze Warning	BIS	18 hr
Oct 25, 11:37 AM CDT	High Wind Watch	BIS	5 hr
Oct 25, 11:37 AM CDT	Wind Advisory	BIS	5 hr
Oct 25, 4:22 PM CDT	High Wind Warning	BIS	51 hr
Oct 25, 4:48 PM CDT	Winter Storm Watch	BIS	12 hr
Oct 26, 4:35 AM CDT	Blizzard Warning	BIS	36 hr
Oct 27, 4:07 PM CDT	Winter Weather Advisory	BIS	6 hr
Oct 27, 9:45 PM CDT	Winter Weather Advisory	BIS	3 hr
Oct 30, 3:29 PM CDT	Dense Fog Advisory	BIS	19 hr
Nov 3, 4:09 AM CDT	Wind Advisory	BIS	15 hr
Nov 9, 3:30 PM CST	Winter Storm Watch	BIS	13 hr
Nov 9, 3:30 PM CST	Winter Weather Advisory	BIS	44 hr
Nov 19, 2:44 AM CST	Winter Weather Advisory	BIS	56 hr
Nov 22, 3:01 AM CST	Winter Storm Watch	BIS	25 hr
Nov 23, 3:35 AM CST	Winter Storm Warning	BIS	56 hr
Nov 25, 11:59 AM CST	Winter Weather Advisory	BIS	4 hr
Nov 28, 3:53 PM CST	Winter Weather Advisory	BIS	36 hr
Dec 2, 4:27 AM CST	Winter Weather Advisory	BIS	45 hr
Dec 5, 6:16 PM CST	Dense Fog Advisory	BIS	18 hr
Dec 7, 1:29 AM CST	Dense Fog Advisory	BIS	9 hr
Dec 9, 4:50 PM CST	Winter Weather Advisory	BIS	35 hr
Dec 10, 11:35 AM CST	Winter Storm Warning	BIS	18 hr
Dec 11, 4:09 AM CST	Wind Chill Advisory	BIS	8 hr
Dec 12, 4:09 AM CST	Winter Weather Advisory	BIS	27 hr
Dec 14, 4:15 AM CST	Winter Weather Advisory	BIS	54 hr
Dec 15, 12:39 AM CST	Ice Storm Warning	BIS	6 hr
Dec 15, 1:21 PM CST	Winter Storm Warning	BIS	21 hr
Dec 18, 3:49 PM CST	Winter Storm Watch	BIS	23 hr
Dec 19, 3:11 PM CST	Winter Storm Warning	BIS	39 hr
Dec 27, 3:04 PM CST	Winter Storm Watch	BIS	44 hr
Dec 29, 4:47 AM CST	Winter Storm Warning	BIS	32 hr
Dec 29, 10:53 AM CST	Winter Weather Advisory	BIS	35 hr
Dec 30, 6:56 PM CST	Wind Chill Advisory	BIS	41 hr
Dec 31, 2:13 AM CST	Winter Weather Advisory	BIS	34 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	28
Tornado Warning	2
Severe Thunderstorm Watch	11
Tornado Watch	3
Mesoscale Discussion	38
Flooding
Flash Flood Warning	3
River Flood Warning	8
Flash Flood Watch	4
River Flood Watch	1
Areal Flood Advisory	7
Winter
Blizzard Warning	2
Ice Storm Warning	1
Winter Storm Warning	7
Winter Storm Watch	7
Freezing Rain Advisory	1
Winter Weather Advisory	22
Cold
Freeze Warning	4
Wind Chill Warning	1
Freeze Watch	3
Frost Advisory	1
Wind Chill Advisory	9
Wind and dust
High Wind Warning	2
High Wind Watch	4
Wind Advisory	11
Fire
Red Flag Warning	2
Fire Weather Watch	3
Fog and smoke
Dense Fog Advisory	12
Freezing Fog Advisory	2

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2009 2011

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.