Alert archive / North Dakota / McHenry County

Weather alerts in McHenry County, North Dakota, 2008

170 weather alerts in 2008, 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 2008. Tap one for its archive.

Alerts: 170
Warnings: 71
Watches: 29
Advisories: 47
Busiest month: August34 alerts
Busiest day: August 2, 200821 alerts

Over time

By month

Warning verification

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

2 of 3 tornado warnings covering McHenry County in 2008 had a tornado report inside them; 2 of 3 tornado reports fell inside a warning, on average 3 minutes after it went out.

McHenry County, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	2	33%	3	67%	3 min
Severe thunderstorm warnings	37	10	73%	2	100%	30 min
Flash flood warnings	2	0	100%	0

Each office's whole area, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	60	15	75%	24	79%	14 min
NWS Bismarck, ND: severe thunderstorm warnings	432	134	69%	216	90%	27 min
NWS Bismarck, ND: flash flood warnings	10	3	70%	4	75%	10 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 5, 9:14 PM CST	Freezing Rain Advisory	BIS	7 hr
Jan 14, 2:32 PM CST	High Wind Watch	BIS	17 hr
Jan 15, 4:54 AM CST	Wind Advisory	BIS	23 hr
Jan 16, 5:06 AM CST	Winter Storm Watch	BIS	23 hr
Jan 17, 4:29 AM CST	Winter Weather Advisory	BIS	23 hr
Jan 18, 3:29 AM CST	Wind Chill Advisory	BIS	30 hr
Jan 22, 3:42 PM CST	Wind Chill Advisory	BIS	12 hr
Jan 27, 3:02 PM CST	Winter Weather Advisory	BIS	36 hr
Jan 28, 3:39 PM CST	Wind Chill Warning	BIS	44 hr
Feb 3, 4:05 PM CST	Snow Advisory	BIS	26 hr
Feb 7, 4:31 AM CST	Blizzard Watch	BIS	35 hr
Feb 8, 3:55 PM CST	Blizzard Warning	BIS	20 hr
Feb 8, 3:55 PM CST	Wind Chill Warning	BIS	44 hr
Feb 10, 3:51 PM CST	Wind Chill Advisory	BIS	20 hr
Feb 12, 4:00 AM CST	Winter Storm Watch	BIS	15 hr
Feb 12, 7:09 PM CST	Heavy Snow Warning	BIS	26 hr
Feb 13, 9:39 AM CST	Mesoscale Discussion	SPC	6 hr
Feb 13, 9:23 PM CST	Wind Chill Advisory	BIS	15 hr
Feb 16, 12:46 AM CST	Freezing Rain Advisory	BIS	10 hr
Feb 16, 11:05 AM CST	Winter Weather Advisory	BIS	4 hr
Feb 17, 3:33 AM CST	Wind Advisory	BIS	17 hr
Feb 17, 8:31 PM CST	Wind Chill Advisory	BIS	19 hr
Feb 19, 3:33 AM CST	Wind Chill Advisory	BIS	24 hr
Feb 19, 6:04 PM CST	Wind Chill Warning	BIS	10 hr
Mar 2, 4:18 AM CST	Wind Advisory	BIS	17 hr
Mar 24, 4:14 AM CDT	High Wind Warning	BIS	18 hr
Mar 24, 5:03 AM CDT	Red Flag Warning	BIS	17 hr
Apr 5, 5:32 AM CDT	Winter Weather Advisory	BIS	37 hr
Apr 13, 4:05 AM CDT	Fire Weather Watch	BIS	25 hr
Apr 14, 4:58 AM CDT	Red Flag Warning	BIS	17 hr
Apr 17, 4:12 AM CDT	Red Flag Warning	BIS	17 hr
Apr 17, 4:03 PM CDT	Fire Weather Watch	BIS	13 hr
Apr 18, 4:38 AM CDT	Red Flag Warning	BIS	16 hr
Apr 18, 3:43 PM CDT	Fire Weather Watch	BIS	13 hr
Apr 19, 4:37 AM CDT	Red Flag Warning	BIS	20 hr
Apr 20, 4:37 AM CDT	Wind Advisory	BIS	17 hr
Apr 20, 5:25 AM CDT	Red Flag Warning	BIS	17 hr
Apr 21, 4:19 PM CDT	Fire Weather Watch	BIS	12 hr
Apr 22, 4:45 AM CDT	Red Flag Warning	BIS	17 hr
May 1, 4:28 AM CDT	Wind Advisory	BIS	41 hr
May 2, 5:22 AM CDT	Red Flag Warning	BIS	16 hr
May 3, 11:10 AM CDT	Red Flag Warning	BIS	10 hr
May 4, 4:25 AM CDT	Red Flag Warning	BIS	17 hr
May 9, 3:50 PM CDT	Winter Weather Advisory	BIS	19 hr
May 16, 4:24 AM CDT	Wind Advisory	BIS	17 hr
May 16, 4:37 AM CDT	Red Flag Warning	BIS	16 hr
May 16, 1:45 PM CDT	Fire Weather Watch	BIS	15 hr
May 17, 4:12 AM CDT	Wind Advisory	BIS	17 hr
May 17, 4:21 AM CDT	Red Flag Warning	BIS	17 hr
May 17, 3:51 PM CDT	Frost Advisory	BIS	16 hr
May 19, 4:13 AM CDT	Wind Advisory	BIS	17 hr
May 20, 3:49 PM CDT	Frost Advisory	BIS	15 hr
May 24, 3:48 AM CDT	Wind Advisory	BIS	15 hr
May 26, 10:50 AM CDT	Freeze Watch	BIS	4 hr
May 26, 3:04 PM CDT	Freeze Warning	BIS	18 hr
Jun 4, 4:27 AM CDT	Dense Fog Advisory	BIS	6 hr
Jun 8, 2:53 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 11, 12:28 PM CDT	Severe Thunderstorm Warning	BIS	38 min
Jun 14, 1:16 PM CDT	Mesoscale Discussion	SPC	89 min
Jun 14, 1:43 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 14, 4:50 PM CDT	Severe Thunderstorm Warning	BIS	55 min
Jun 14, 5:33 PM CDT	Severe Thunderstorm Warning	BIS	57 min
Jun 14, 6:04 PM CDT	Mesoscale Discussion	SPC	86 min
Jun 18, 2:27 PM CDT	Mesoscale Discussion	SPC	93 min
Jun 18, 4:16 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Jun 18, 4:30 PM CDT	Severe Thunderstorm Warning	BIS	30 min
Jun 18, 4:59 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 18, 5:01 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Jun 18, 5:16 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Jun 18, 6:13 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Jun 18, 7:13 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Jun 18, 8:46 PM CDT	Mesoscale Discussion	SPC	89 min
Jun 18, 9:10 PM CDT	Severe Thunderstorm Warning	BIS	50 min
Jun 19, 6:20 PM CDT	Severe Thunderstorm Warning	BIS	55 min
Jun 23, 5:15 PM CDT	Severe Thunderstorm Warning	BIS	60 min
Jun 23, 5:56 PM CDT	Severe Thunderstorm Warning	BIS	64 min
Jun 24, 2:51 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 24, 9:18 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Jun 26, 1:41 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 26, 1:59 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 26, 4:55 PM CDT	Severe Thunderstorm Warning	BIS	65 min
Jun 26, 5:33 PM CDT	Severe Thunderstorm Warning	BIS	57 min
Jun 28, 4:19 AM CDT	Wind Advisory	BIS	16 hr
Jul 10, 2:41 AM CDT	Mesoscale Discussion	SPC	3 hr
Jul 10, 3:46 PM CDT	Mesoscale Discussion	SPC	59 min
Jul 10, 4:11 PM CDT	Tornado Watch	SPC	7 hr
Jul 10, 11:19 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 11, 4:52 AM CDT	Wind Advisory	BIS	16 hr
Jul 11, 6:36 AM CDT	Mesoscale Discussion	SPC	24 min
Jul 11, 3:58 PM CDT	Wind Advisory	BIS	20 hr
Jul 12, 11:33 AM CDT	High Wind Warning	BIS	7 hr
Jul 20, 12:12 AM CDT	Severe Thunderstorm Warning	BIS	44 min
Jul 23, 2:03 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 28, 6:14 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 28, 7:45 AM CDT	Severe Thunderstorm Warning	BIS	60 min
Jul 28, 7:50 AM CDT	Mesoscale Discussion	SPC	85 min
Jul 28, 8:50 AM CDT	Severe Thunderstorm Warning	BIS	55 min
Jul 30, 4:07 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 30, 7:04 PM CDT	Mesoscale Discussion	SPC	56 min
Jul 30, 7:47 PM CDT	Severe Thunderstorm Warning	BIS	58 min
Jul 30, 8:31 PM CDT	Severe Thunderstorm Warning	BIS	38 min
Jul 30, 9:42 PM CDT	Mesoscale Discussion	SPC	93 min
Jul 30, 10:04 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 1, 8:35 PM CDT	Mesoscale Discussion	SPC	55 min
Aug 1, 8:43 PM CDT	Severe Thunderstorm Warning	BIS	47 min
Aug 1, 9:08 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 1, 9:27 PM CDT	Severe Thunderstorm Warning	BIS	29 min
Aug 1, 10:54 PM CDT	Mesoscale Discussion	SPC	96 min
Aug 2, 2:24 AM CDT	Mesoscale Discussion	SPC	96 min
Aug 2, 4:05 AM CDT	Severe Thunderstorm Warning	BIS	40 min
Aug 2, 4:43 AM CDT	Severe Thunderstorm Warning	BIS	43 min
Aug 2, 8:52 AM CDT	Severe Thunderstorm Warning	BIS	37 min
Aug 2, 9:14 AM CDT	Severe Thunderstorm Warning	BIS	61 min
Aug 2, 9:17 AM CDT	Severe Thunderstorm Warning	BIS	58 min
Aug 2, 10:17 AM CDT	Severe Thunderstorm Warning	BIS	58 min
Aug 2, 10:22 AM CDT	Areal Flood Advisory	BIS	6 hr
Aug 2, 11:13 AM CDT	Severe Thunderstorm Warning	BIS	62 min
Aug 2, 11:56 AM CDT	Flash Flood Warning	BIS	34 min
Aug 2, 12:05 PM CDT	Severe Thunderstorm Warning	BIS	55 min
Aug 2, 12:12 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Aug 2, 12:26 PM CDT	Flash Flood Warning	BIS	64 min
Aug 2, 1:04 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Aug 2, 1:26 PM CDT	Areal Flood Advisory	BIS	6 hr
Aug 2, 1:45 PM CDT	Mesoscale Discussion	SPC	60 min
Aug 3, 12:05 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 3, 4:10 AM CDT	Mesoscale Discussion	SPC	95 min
Aug 3, 5:33 AM CDT	Severe Thunderstorm Warning	BIS	24 min
Aug 11, 3:53 AM CDT	Flash Flood Watch	BIS	15 hr
Aug 11, 4:23 PM CDT	Tornado Warning	BIS	37 min
Aug 11, 4:45 PM CDT	Tornado Warning	BIS	30 min
Aug 21, 7:33 PM CDT	Tornado Warning	BIS	27 min
Aug 21, 7:57 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Aug 22, 2:27 AM CDT	Mesoscale Discussion	SPC	93 min
Aug 22, 3:05 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 22, 3:45 AM CDT	Wind Advisory	BIS	17 hr
Aug 26, 2:33 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 26, 6:58 PM CDT	Severe Thunderstorm Warning	BIS	48 min
Sep 6, 2:31 PM CDT	Severe Thunderstorm Warning	BIS	29 min
Sep 7, 4:20 AM CDT	Frost Advisory	BIS	27 hr
Sep 23, 1:13 PM CDT	Mesoscale Discussion	SPC	2 hr
Oct 8, 4:42 AM CDT	Freeze Warning	BIS	28 hr
Oct 8, 4:42 AM CDT	Wind Advisory	BIS	14 hr
Oct 13, 2:50 PM CDT	Freeze Warning	BIS	18 hr
Oct 24, 4:04 PM CDT	Wind Advisory	BIS	32 hr
Oct 25, 3:44 AM CDT	High Wind Watch	BIS	24 hr
Oct 26, 3:14 AM CDT	High Wind Warning	BIS	16 hr
Oct 26, 3:53 PM CDT	Wind Advisory	BIS	3 hr
Nov 4, 3:07 AM CST	Winter Storm Watch	BIS	51 hr
Nov 5, 3:24 AM CST	Winter Storm Warning	BIS	55 hr
Nov 6, 3:33 AM CST	Mesoscale Discussion	SPC	4 hr
Nov 7, 4:30 AM CST	Winter Weather Advisory	BIS	11 hr
Nov 13, 3:01 PM CST	Wind Advisory	BIS	27 hr
Nov 14, 2:17 PM CST	Mesoscale Discussion	SPC	58 min
Dec 2, 4:25 AM CST	Wind Advisory	BIS	11 hr
Dec 8, 1:09 AM CST	Winter Weather Advisory	BIS	17 hr
Dec 11, 3:07 PM CST	Winter Storm Watch	BIS	14 hr
Dec 12, 4:57 AM CST	Blizzard Watch	BIS	10 hr
Dec 12, 2:45 PM CST	Blizzard Warning	BIS	57 hr
Dec 14, 4:36 AM CST	Wind Chill Warning	BIS	31 hr
Dec 15, 12:10 PM CST	Wind Chill Advisory	BIS	4 hr
Dec 18, 3:44 PM CST	Winter Storm Watch	BIS	12 hr
Dec 19, 3:46 AM CST	Winter Storm Warning	BIS	32 hr
Dec 20, 6:45 AM CST	Wind Chill Warning	BIS	30 hr
Dec 20, 11:43 AM CST	Winter Weather Advisory	BIS	13 hr
Dec 21, 12:11 PM CST	Wind Chill Advisory	BIS	9 hr
Dec 22, 3:57 AM CST	Winter Weather Advisory	BIS	35 hr
Dec 25, 2:50 PM CST	Winter Weather Advisory	BIS	42 hr
Dec 28, 3:14 PM CST	Winter Weather Advisory	BIS	14 hr
Dec 29, 4:56 AM CST	Winter Storm Warning	BIS	34 hr
Dec 29, 4:56 AM CST	Winter Weather Advisory	BIS	31 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	37
Tornado Warning	3
Severe Thunderstorm Watch	12
Tornado Watch	1
Mesoscale Discussion	23
Flooding
Flash Flood Warning	2
Flash Flood Watch	1
Areal Flood Advisory	2
Winter
Blizzard Warning	2
Heavy Snow Warning	1
Winter Storm Warning	3
Blizzard Watch	2
Winter Storm Watch	5
Freezing Rain Advisory	2
Snow Advisory	1
Winter Weather Advisory	12
Cold
Freeze Warning	3
Wind Chill Warning	5
Freeze Watch	1
Frost Advisory	3
Wind Chill Advisory	8
Wind and dust
High Wind Warning	3
High Wind Watch	2
Wind Advisory	18
Fire
Red Flag Warning	12
Fire Weather Watch	5
Fog and smoke
Dense Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2007 2009

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.