Alert archive / North Dakota / McHenry County

Weather alerts in McHenry County, North Dakota, 2015

145 weather alerts in 2015, 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 2015. Tap one for its archive.

Alerts: 145
Warnings: 32
Watches: 20
Advisories: 64
Busiest month: July33 alerts
Busiest day: June 21, 20156 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 2015 had a tornado report inside them.

McHenry County, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	0
Severe thunderstorm warnings	10	5	50%	7	100%	22 min
Flash flood warnings	0			0

Each office's whole area, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	15	1	93%	7	14%	4 min
NWS Bismarck, ND: severe thunderstorm warnings	183	122	33%	264	77%	26 min
NWS Bismarck, ND: flash flood warnings	4	2	50%	2	100%	26 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, 3:55 AM CST	Winter Storm Watch	BIS	11 hr
Jan 1, 3:10 PM CST	Winter Weather Advisory	BIS	39 hr
Jan 3, 6:30 AM CST	Wind Chill Warning	BIS	54 hr
Jan 5, 3:42 PM CST	Wind Chill Advisory	BIS	32 hr
Jan 6, 3:24 AM CST	Wind Chill Warning	BIS	33 hr
Jan 7, 9:09 AM CST	Blizzard Watch	BIS	7 hr
Jan 7, 3:55 PM CST	Blizzard Warning	BIS	26 hr
Jan 7, 3:55 PM CST	Winter Weather Advisory	BIS	26 hr
Jan 8, 2:41 PM CST	Wind Chill Advisory	BIS	21 hr
Jan 9, 2:56 PM CST	Wind Chill Advisory	BIS	19 hr
Jan 10, 3:06 PM CST	Wind Chill Advisory	BIS	21 hr
Jan 11, 3:09 PM CST	Wind Chill Advisory	BIS	19 hr
Jan 12, 3:24 PM CST	Wind Chill Advisory	BIS	19 hr
Jan 16, 2:33 PM CST	Wind Advisory	BIS	22 hr
Jan 28, 3:48 AM CST	Dense Fog Advisory	BIS	8 hr
Jan 31, 3:13 PM CST	Wind Chill Advisory	BIS	20 hr
Feb 3, 9:37 PM CST	Wind Chill Advisory	BIS	12 hr
Feb 9, 3:38 AM CST	Winter Weather Advisory	BIS	33 hr
Feb 11, 2:34 AM CST	Wind Chill Advisory	BIS	33 hr
Feb 13, 3:53 PM CST	Wind Chill Advisory	BIS	24 hr
Feb 14, 3:49 AM CST	Winter Weather Advisory	BIS	30 hr
Feb 16, 3:24 PM CST	Wind Chill Advisory	BIS	45 hr
Feb 18, 3:23 PM CST	Wind Chill Advisory	BIS	19 hr
Feb 20, 5:50 PM CST	Wind Chill Advisory	BIS	60 hr
Feb 21, 3:46 AM CST	Wind Chill Warning	BIS	32 hr
Feb 25, 3:34 AM CST	Wind Chill Advisory	BIS	32 hr
Feb 26, 2:59 PM CST	Wind Chill Advisory	BIS	19 hr
Mar 2, 2:25 PM CST	Wind Advisory	BIS	28 hr
Mar 3, 2:56 PM CST	Wind Chill Advisory	BIS	21 hr
Mar 4, 2:43 PM CST	Wind Chill Advisory	BIS	18 hr
Mar 28, 3:59 AM CDT	Wind Advisory	BIS	33 hr
Mar 28, 7:16 PM CDT	Mesoscale Discussion	SPC	89 min
Mar 29, 9:08 PM CDT	River Flood Warning	BIS	41 days
Mar 30, 11:59 AM CDT	River Flood Warning	BIS	40 days
Mar 31, 3:56 AM CDT	Fire Weather Watch	BIS	11 hr
Mar 31, 3:25 PM CDT	Red Flag Warning	BIS	30 hr
Apr 2, 6:35 AM CDT	Wind Advisory	BIS	12 hr
Apr 12, 12:59 PM CDT	Fire Weather Watch	BIS	15 hr
Apr 13, 3:59 AM CDT	Fire Weather Watch	BIS	17 hr
Apr 13, 3:59 AM CDT	Red Flag Warning	BIS	16 hr
Apr 13, 1:18 PM CDT	Wind Advisory	BIS	5 hr
Apr 13, 8:58 PM CDT	Red Flag Warning	BIS	25 hr
Apr 14, 3:42 AM CDT	Fire Weather Watch	BIS	24 hr
Apr 15, 3:23 AM CDT	Wind Advisory	BIS	16 hr
Apr 15, 3:47 AM CDT	Red Flag Warning	BIS	16 hr
Apr 19, 2:33 PM CDT	Red Flag Warning	BIS	31 hr
Apr 20, 3:32 AM CDT	Wind Advisory	BIS	17 hr
Apr 30, 3:28 PM CDT	Fire Weather Watch	BIS	12 hr
May 1, 3:21 AM CDT	Red Flag Warning	BIS	16 hr
May 1, 2:51 PM CDT	Fire Weather Watch	BIS	12 hr
May 2, 3:10 AM CDT	Red Flag Warning	BIS	17 hr
May 3, 6:56 PM CDT	Frost Advisory	BIS	14 hr
May 4, 3:03 PM CDT	Fire Weather Watch	BIS	12 hr
May 5, 3:12 AM CDT	Red Flag Warning	BIS	16 hr
May 7, 2:58 PM CDT	Frost Advisory	BIS	17 hr
May 8, 3:40 PM CDT	Frost Advisory	BIS	17 hr
May 11, 3:37 PM CDT	Frost Advisory	BIS	17 hr
May 17, 4:23 AM CDT	Wind Advisory	BIS	27 hr
May 17, 4:45 AM CDT	Winter Weather Advisory	BIS	26 hr
May 18, 4:00 AM CDT	Freeze Warning	BIS	29 hr
May 19, 3:01 PM CDT	Frost Advisory	BIS	18 hr
May 29, 2:56 PM CDT	Frost Advisory	BIS	18 hr
Jun 19, 6:58 AM CDT	Special Weather Statement	BIS	47 min
Jun 19, 5:48 PM CDT	Mesoscale Discussion	SPC	57 min
Jun 20, 4:30 AM CDT	Dense Fog Advisory	BIS	5 hr
Jun 20, 3:24 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 20, 8:05 PM CDT	Special Weather Statement	BIS	25 min
Jun 20, 8:09 PM CDT	Severe Thunderstorm Warning	BIS	66 min
Jun 20, 8:27 PM CDT	Tornado Warning	BIS	33 min
Jun 20, 8:49 PM CDT	Tornado Warning	BIS	26 min
Jun 21, 3:23 PM CDT	Tornado Watch	SPC	8 hr
Jun 21, 5:24 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 21, 7:47 PM CDT	Severe Thunderstorm Warning	BIS	31 min
Jun 23, 7:39 PM CDT	Special Weather Statement	BIS	36 min
Jul 1, 3:07 AM CDT	Dense Fog Advisory	BIS	7 hr
Jul 4, 1:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 4, 2:47 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 7:17 PM CDT	Severe Thunderstorm Warning	BIS	58 min
Jul 4, 8:14 PM CDT	Special Weather Statement	BIS	46 min
Jul 11, 5:00 PM CDT	Mesoscale Discussion	SPC	60 min
Jul 11, 5:40 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 11, 6:59 PM CDT	Special Weather Statement	BIS	46 min
Jul 11, 7:41 PM CDT	Special Weather Statement	BIS	34 min
Jul 11, 9:04 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 12, 6:50 PM CDT	Special Weather Statement	BIS	40 min
Jul 12, 7:36 PM CDT	Severe Thunderstorm Warning	BIS	54 min
Jul 14, 5:03 PM CDT	Special Weather Statement	BIS	27 min
Jul 14, 5:28 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Jul 15, 7:06 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 15, 7:42 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Jul 15, 8:39 PM CDT	Severe Thunderstorm Warning	BIS	66 min
Jul 15, 9:28 PM CDT	Special Weather Statement	BIS	32 min
Jul 23, 1:34 PM CDT	Mesoscale Discussion	SPC	116 min
Jul 23, 3:58 PM CDT	Severe Thunderstorm Watch	SPC	11 hr
Jul 23, 5:41 PM CDT	Severe Thunderstorm Warning	BIS	64 min
Jul 23, 6:21 PM CDT	Mesoscale Discussion	SPC	24 min
Jul 23, 6:55 PM CDT	Areal Flood Advisory	BIS	3 hr
Jul 25, 4:30 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 25, 8:30 PM CDT	Special Weather Statement	BIS	45 min
Jul 26, 2:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 26, 3:42 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 26, 6:23 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 27, 3:40 AM CDT	High Wind Watch	BIS	23 hr
Jul 27, 10:49 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 28, 12:10 AM CDT	Special Weather Statement	BIS	50 min
Jul 28, 2:33 AM CDT	High Wind Warning	BIS	22 hr
Jul 28, 2:33 AM CDT	Wind Advisory	BIS	40 hr
Aug 5, 6:14 PM CDT	Special Weather Statement	BIS	46 min
Aug 21, 1:42 PM CDT	Wind Advisory	BIS	53 hr
Sep 5, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Sep 6, 1:57 AM CDT	Severe Thunderstorm Warning	BIS	48 min
Sep 6, 2:33 AM CDT	Severe Thunderstorm Warning	BIS	42 min
Sep 6, 2:45 AM CDT	Special Weather Statement	BIS	45 min
Sep 9, 2:45 PM CDT	Frost Advisory	BIS	18 hr
Sep 10, 1:59 PM CDT	Frost Advisory	BIS	19 hr
Sep 17, 12:25 AM CDT	Special Weather Statement	BIS	50 min
Sep 17, 3:14 PM CDT	Frost Advisory	BIS	18 hr
Sep 24, 1:29 AM CDT	Areal Flood Advisory	BIS	8 hr
Sep 24, 3:31 AM CDT	Dense Fog Advisory	BIS	8 hr
Sep 25, 2:52 AM CDT	Dense Fog Advisory	BIS	8 hr
Sep 28, 1:25 PM CDT	Frost Advisory	BIS	19 hr
Sep 30, 11:39 PM CDT	Special Weather Statement	BIS	21 min
Oct 10, 11:10 AM CDT	High Wind Watch	BIS	17 hr
Oct 11, 3:48 AM CDT	High Wind Warning	BIS	35 hr
Oct 15, 3:33 AM CDT	Freeze Warning	BIS	30 hr
Oct 26, 4:17 AM CDT	Dense Fog Advisory	BIS	8 hr
Oct 28, 3:44 AM CDT	Wind Advisory	BIS	15 hr
Oct 31, 3:46 AM CDT	Wind Advisory	BIS	15 hr
Nov 3, 3:16 PM CST	Dense Fog Advisory	BIS	30 hr
Nov 10, 12:45 AM CST	Dense Fog Advisory	BIS	11 hr
Nov 10, 10:10 AM CST	Dense Fog Advisory	BIS	110 min
Nov 10, 2:47 PM CST	High Wind Watch	BIS	24 hr
Nov 11, 2:48 PM CST	Wind Advisory	BIS	27 hr
Nov 16, 2:49 PM CST	High Wind Watch	BIS	30 hr
Nov 17, 4:44 AM CST	High Wind Warning	BIS	55 hr
Nov 18, 8:18 AM CST	Freezing Rain Advisory	BIS	3 hr
Nov 19, 3:33 AM CST	Wind Advisory	BIS	14 hr
Dec 12, 3:36 PM CST	Dense Fog Advisory	BIS	23 hr
Dec 13, 3:02 PM CST	Dense Fog Advisory	BIS	20 hr
Dec 20, 8:05 PM CST	Dense Fog Advisory	BIS	16 hr
Dec 21, 2:15 PM CST	Winter Weather Advisory	BIS	29 hr
Dec 22, 12:05 PM CST	Mesoscale Discussion	SPC	6 hr
Dec 22, 1:03 PM CST	Winter Storm Warning	BIS	17 hr
Dec 25, 8:45 PM CST	Wind Chill Advisory	BIS	13 hr
Dec 26, 2:58 PM CST	Wind Chill 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	10
Tornado Warning	2
Severe Thunderstorm Watch	6
Tornado Watch	1
Mesoscale Discussion	14
Special Weather Statement	15
Flooding
River Flood Warning	2
Areal Flood Advisory	2
Winter
Blizzard Warning	1
Winter Storm Warning	1
Blizzard Watch	1
Winter Storm Watch	1
Freezing Rain Advisory	1
Winter Weather Advisory	6
Cold
Freeze Warning	2
Wind Chill Warning	3
Frost Advisory	10
Wind Chill Advisory	19
Wind and dust
High Wind Warning	3
High Wind Watch	4
Wind Advisory	14
Fire
Red Flag Warning	8
Fire Weather Watch	7
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 2014 2016

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.