Alert archive / North Dakota / McHenry County

Weather alerts in McHenry County, North Dakota, 2017

108 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts: 108
Warnings: 33
Watches: 6
Advisories: 43
Busiest month: July26 alerts
Busiest day: June 9, 20177 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 1 tornado warnings covering McHenry County in 2017 had a tornado report inside them.

McHenry County, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	0	100%	0
Severe thunderstorm warnings	15	12	20%	12	83%	22 min
Flash flood warnings	0			0

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	5	1	80%	1	100%	2 min
NWS Bismarck, ND: severe thunderstorm warnings	148	98	34%	188	89%	25 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, 4:21 AM CST	Winter Storm Warning	BIS	50 hr
Jan 2, 4:52 PM CST	Wind Chill Advisory	BIS	22 hr
Jan 3, 3:06 PM CST	Wind Chill Warning	BIS	21 hr
Jan 4, 12:07 PM CST	Wind Chill Advisory	BIS	46 hr
Jan 6, 3:23 PM CST	Wind Chill Advisory	BIS	21 hr
Jan 7, 3:37 PM CST	Wind Chill Advisory	BIS	17 hr
Jan 8, 3:51 PM CST	Wind Chill Advisory	BIS	11 hr
Jan 10, 4:03 AM CST	Wind Chill Advisory	BIS	3 days
Jan 11, 2:24 PM CST	Winter Weather Advisory	BIS	24 hr
Jan 12, 2:08 PM CST	Wind Chill Warning	BIS	22 hr
Jan 20, 5:59 PM CST	Dense Fog Advisory	BIS	18 hr
Jan 29, 3:07 AM CST	High Wind Watch	BIS	266 days
Jan 29, 11:24 PM CST	High Wind Warning	BIS	15 hr
Feb 5, 3:46 AM CST	Winter Weather Advisory	BIS	53 hr
Feb 7, 3:19 PM CST	Wind Chill Advisory	BIS	42 hr
Feb 7, 10:59 PM CST	Wind Chill Warning	BIS	12 hr
Feb 19, 6:10 PM CST	Dense Fog Advisory	BIS	13 hr
Mar 5, 3:54 PM CST	Winter Storm Warning	BIS	13 hr
Mar 5, 3:54 PM CST	Winter Weather Advisory	BIS	65 hr
Mar 6, 4:52 AM CST	Blizzard Warning	BIS	40 hr
Mar 9, 3:39 AM CST	Wind Chill Advisory	BIS	32 hr
Mar 10, 3:23 PM CST	Wind Chill Advisory	BIS	16 hr
Mar 11, 3:55 PM CST	Winter Weather Advisory	BIS	30 hr
Mar 25, 12:36 PM CDT	River Flood Warning	BIS	43 days
Mar 27, 11:26 AM CDT	River Flood Warning	BIS	3 days
Mar 27, 3:59 PM CDT	River Flood Warning	BIS	37 days
Mar 27, 8:53 PM CDT	Dense Fog Advisory	BIS	15 hr
Mar 28, 4:08 PM CDT	Areal Flood Advisory	BIS	6 days
Mar 29, 12:23 PM CDT	River Flood Warning	BIS	38 days
Mar 30, 11:40 AM CDT	Areal Flood Advisory	BIS	4 days
Apr 21, 5:21 AM CDT	Dense Fog Advisory	BIS	6 hr
Apr 23, 9:58 PM CDT	Winter Weather Advisory	BIS	14 hr
May 17, 2:38 PM CDT	Frost Advisory	BIS	18 hr
May 18, 2:44 PM CDT	Frost Advisory	BIS	18 hr
May 19, 2:59 PM CDT	Frost Advisory	BIS	12 hr
May 27, 3:25 PM CDT	Special Weather Statement	BIS	50 min
May 27, 4:59 PM CDT	Special Weather Statement	BIS	46 min
May 27, 6:36 PM CDT	Special Weather Statement	BIS	2 hr
Jun 9, 3:26 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 9, 4:53 PM CDT	Severe Thunderstorm Warning	BIS	67 min
Jun 9, 4:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 9, 5:22 PM CDT	Severe Thunderstorm Warning	BIS	38 min
Jun 9, 5:34 PM CDT	Tornado Warning Tornado observed	BIS	7 min
Jun 9, 5:58 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Jun 9, 6:26 PM CDT	Severe Thunderstorm Warning	BIS	64 min
Jun 19, 1:42 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 19, 3:12 PM CDT	Special Weather Statement	BIS	48 min
Jun 19, 3:13 PM CDT	Special Weather Statement	BIS	47 min
Jun 22, 3:59 AM CDT	Wind Advisory	BIS	18 hr
Jun 29, 12:54 PM CDT	Special Weather Statement	BIS	51 min
Jul 5, 5:52 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 5, 10:12 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 6, 12:05 AM CDT	Severe Thunderstorm Warning	BIS	55 min
Jul 6, 12:58 AM CDT	Severe Thunderstorm Warning	BIS	62 min
Jul 6, 1:58 AM CDT	Severe Thunderstorm Warning	BIS	47 min
Jul 14, 3:03 PM CDT	Mesoscale Discussion	SPC	57 min
Jul 14, 4:17 PM CDT	Severe Thunderstorm Warning	BIS	43 min
Jul 14, 5:04 PM CDT	Severe Thunderstorm Warning	BIS	43 min
Jul 16, 9:38 PM CDT	Special Weather Statement	BIS	52 min
Jul 16, 10:28 PM CDT	Special Weather Statement	BIS	47 min
Jul 16, 10:47 PM CDT	Special Weather Statement	BIS	43 min
Jul 16, 11:40 PM CDT	Special Weather Statement	BIS	35 min
Jul 17, 12:20 AM CDT	Special Weather Statement	BIS	40 min
Jul 19, 7:01 AM CDT	Mesoscale Discussion	SPC	119 min
Jul 20, 7:58 PM CDT	Special Weather Statement	BIS	47 min
Jul 21, 9:42 AM CDT	Mesoscale Discussion	SPC	93 min
Jul 21, 3:07 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 21, 7:46 PM CDT	Mesoscale Discussion	SPC	89 min
Jul 21, 8:10 PM CDT	Severe Thunderstorm Warning	BIS	65 min
Jul 21, 9:09 PM CDT	Severe Thunderstorm Warning	BIS	66 min
Jul 21, 9:40 PM CDT	Severe Thunderstorm Warning	BIS	65 min
Jul 21, 10:12 PM CDT	Severe Thunderstorm Warning	BIS	33 min
Jul 21, 10:34 PM CDT	Mesoscale Discussion	SPC	56 min
Jul 24, 10:39 PM CDT	Severe Thunderstorm Warning	BIS	52 min
Jul 24, 11:41 PM CDT	Severe Thunderstorm Warning	BIS	31 min
Jul 29, 2:01 PM CDT	Mesoscale Discussion	SPC	89 min
Aug 16, 2:26 AM CDT	Dense Fog Advisory	BIS	8 hr
Aug 17, 9:41 PM CDT	Special Weather Statement	BIS	49 min
Aug 17, 10:41 PM CDT	Special Weather Statement	BIS	34 min
Aug 17, 11:22 PM CDT	Special Weather Statement	BIS	23 min
Aug 18, 2:03 AM CDT	Special Weather Statement	BIS	42 min
Aug 26, 12:19 AM CDT	Dense Fog Advisory	BIS	10 hr
Sep 19, 1:51 PM CDT	Mesoscale Discussion	SPC	54 min
Oct 6, 2:31 PM CDT	Wind Advisory	BIS	26 hr
Oct 8, 2:48 PM CDT	Freeze Warning	BIS	18 hr
Oct 9, 9:45 AM CDT	Freeze Warning	BIS	23 hr
Oct 17, 1:36 PM CDT	Wind Advisory	BIS	29 hr
Oct 17, 1:49 PM CDT	Fire Weather Watch	BIS	13 hr
Oct 18, 3:16 AM CDT	Red Flag Warning	BIS	16 hr
Oct 22, 4:00 PM CDT	Wind Advisory	BIS	27 hr
Oct 25, 3:36 PM CDT	Wind Advisory	BIS	27 hr
Oct 29, 2:58 AM CDT	Wind Advisory	BIS	38 hr
Nov 2, 2:35 PM CDT	Winter Weather Advisory	BIS	47 hr
Nov 12, 4:24 PM CST	Dense Fog Advisory	BIS	19 hr
Nov 16, 9:28 PM CST	Winter Weather Advisory	BIS	6 hr
Nov 20, 11:40 AM CST	Wind Advisory	BIS	15 hr
Nov 23, 2:39 PM CST	Wind Advisory	BIS	19 hr
Nov 29, 3:43 AM CST	Wind Advisory	BIS	18 hr
Dec 4, 10:34 AM CST	Wind Advisory	BIS	7 hr
Dec 10, 9:39 PM CST	Wind Advisory	BIS	13 hr
Dec 12, 3:08 PM CST	Wind Advisory	BIS	21 hr
Dec 18, 3:01 PM CST	Winter Storm Watch	BIS	24 hr
Dec 19, 2:57 PM CST	Winter Storm Warning	BIS	30 hr
Dec 19, 2:57 PM CST	Winter Weather Advisory	BIS	36 hr
Dec 24, 3:57 AM CST	Wind Chill Warning	BIS	57 hr
Dec 26, 12:49 PM CST	Wind Chill Advisory	BIS	23 hr
Dec 27, 3:45 PM CST	Wind Chill Advisory	BIS	50 hr
Dec 29, 5:15 AM CST	Wind Chill Warning	BIS	3 days

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	15
Tornado Warning	1
Severe Thunderstorm Watch	3
Mesoscale Discussion	10
Special Weather Statement	16
Flooding
River Flood Warning	4
Areal Flood Advisory	2
Winter
Blizzard Warning	1
Winter Storm Warning	3
Winter Storm Watch	1
Winter Weather Advisory	8
Cold
Freeze Warning	2
Wind Chill Warning	5
Frost Advisory	3
Wind Chill Advisory	11
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	12
Fire
Red Flag Warning	1
Fire Weather Watch	1
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 2016 2018

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.