Alert archive / North Dakota / Griggs County

Weather alerts in Griggs County, North Dakota, 2011

166 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Griggs County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts: 166
Warnings: 36
Watches: 36
Advisories: 55
Busiest month: July47 alerts
Busiest day: August 1, 201115 alerts

Over time

By month

Warning verification

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

3 of 4 tornado warnings covering Griggs County in 2011 had a tornado report inside them; 5 of 6 tornado reports fell inside a warning, on average 14 minutes after it went out.

Griggs County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	3	25%	6	83%	14 min
Severe thunderstorm warnings	13	7	46%	3	33%	34 min
Flash flood warnings	1	0	100%	0

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Grand Forks, ND: tornado warnings	51	9	82%	18	67%	15 min
NWS Grand Forks, ND: severe thunderstorm warnings	176	117	34%	287	82%	26 min
NWS Grand Forks, ND: flash flood warnings	16	7	56%	11	73%	84 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, 4:11 AM CST	Winter Weather Advisory	FGF	12 hr
Jan 1, 3:47 PM CST	Wind Chill Advisory	FGF	17 hr
Jan 14, 1:27 PM CST	Winter Weather Advisory	FGF	13 hr
Jan 17, 3:43 AM CST	Winter Weather Advisory	FGF	14 hr
Jan 17, 3:33 PM CST	Wind Chill Advisory	FGF	17 hr
Jan 18, 3:10 PM CST	Wind Chill Advisory	FGF	20 hr
Jan 19, 3:29 PM CST	Wind Chill Advisory	FGF	3 days
Jan 19, 3:29 PM CST	Winter Weather Advisory	FGF	18 hr
Jan 21, 3:21 PM CST	Wind Chill Advisory	FGF	24 hr
Jan 22, 3:45 PM CST	Wind Chill Advisory	FGF	5 hr
Jan 24, 4:06 AM CST	Winter Weather Advisory	FGF	10 hr
Jan 28, 6:34 PM CST	Wind Advisory	FGF	5 hr
Jan 29, 3:14 PM CST	Wind Chill Advisory	FGF	3 days
Feb 1, 3:18 PM CST	Wind Chill Warning	FGF	21 hr
Feb 4, 4:25 AM CST	Winter Weather Advisory	FGF	5 hr
Feb 6, 3:43 PM CST	Wind Chill Advisory	FGF	44 hr
Feb 7, 3:26 PM CST	Wind Chill Warning	FGF	21 hr
Feb 8, 3:01 PM CST	Wind Chill Advisory	FGF	21 hr
Feb 9, 3:26 PM CST	Wind Chill Advisory	FGF	19 hr
Feb 12, 3:58 AM CST	High Wind Watch	FGF	26 hr
Feb 13, 5:47 AM CST	High Wind Warning	FGF	16 hr
Feb 13, 5:47 AM CST	Wind Advisory	FGF	18 hr
Feb 17, 12:14 PM CST	Wind Advisory	FGF	12 hr
Feb 24, 3:33 PM CST	Wind Chill Advisory	FGF	19 hr
Feb 25, 3:02 PM CST	Wind Chill Advisory	FGF	21 hr
Mar 1, 3:54 AM CST	Wind Chill Advisory	FGF	29 hr
Mar 8, 10:49 AM CST	Winter Weather Advisory	FGF	17 hr
Mar 10, 4:20 PM CST	Winter Storm Watch	FGF	12 hr
Mar 11, 4:26 AM CST	Blizzard Warning	FGF	26 hr
Mar 15, 7:14 AM CDT	Freezing Rain Advisory	FGF	3 hr
Mar 20, 9:07 AM CDT	Dense Fog Advisory	FGF	6 hr
Mar 20, 3:27 PM CDT	Winter Storm Watch	FGF	24 hr
Mar 21, 3:12 PM CDT	Winter Storm Warning	FGF	45 hr
Mar 22, 10:39 AM CDT	Mesoscale Discussion	SPC	6 hr
Apr 10, 12:03 PM CDT	Areal Flood Warning	FGF	8 days
Apr 14, 4:04 AM CDT	Winter Storm Watch	FGF	11 hr
Apr 14, 3:13 PM CDT	Winter Storm Warning	FGF	30 hr
Apr 14, 3:13 PM CDT	Winter Weather Advisory	FGF	38 hr
Apr 14, 8:20 PM CDT	Areal Flood Warning	FGF	20 days
Apr 16, 4:03 PM CDT	Areal Flood Warning	FGF	109 days
Apr 20, 9:28 AM CDT	Areal Flood Advisory	FGF	5 days
Apr 29, 9:24 AM CDT	Wind Advisory	FGF	13 hr
Apr 30, 4:39 AM CDT	Winter Weather Advisory	FGF	32 hr
Apr 30, 11:20 AM CDT	Wind Advisory	FGF	32 hr
May 1, 9:38 AM CDT	Wind Advisory	FGF	9 hr
May 10, 1:56 AM CDT	Mesoscale Discussion	SPC	94 min
May 15, 2:23 PM CDT	Frost Advisory	FGF	17 hr
May 17, 3:46 AM CDT	Red Flag Warning	FGF	16 hr
May 24, 2:46 PM CDT	Frost Advisory	FGF	17 hr
May 25, 2:39 PM CDT	Frost Advisory	FGF	17 hr
May 30, 3:09 PM CDT	High Wind Watch	FGF	13 hr
May 31, 3:44 AM CDT	Wind Advisory	FGF	19 hr
May 31, 6:12 PM CDT	High Wind Warning	FGF	3 hr
Jun 3, 1:11 AM CDT	Mesoscale Discussion	SPC	94 min
Jun 3, 1:25 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 3, 2:11 AM CDT	Severe Thunderstorm Warning	FGF	64 min
Jun 3, 2:32 AM CDT	Severe Thunderstorm Warning	FGF	58 min
Jun 7, 2:51 PM CDT	Mesoscale Discussion	SPC	114 min
Jun 7, 7:11 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 13, 7:22 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 17, 5:34 PM CDT	Tornado Watch	SPC	5 hr
Jun 19, 2:38 PM CDT	Flood Watch	FGF	61 hr
Jun 25, 8:01 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 25, 10:47 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 29, 3:49 PM CDT	Heat Advisory	FGF	29 hr
Jul 4, 1:56 PM CDT	Mesoscale Discussion	SPC	64 min
Jul 4, 3:06 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 4, 6:09 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 8, 5:38 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 8, 6:02 PM CDT	Tornado Watch	SPC	7 hr
Jul 8, 10:37 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 10, 11:08 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 10, 2:08 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 15, 2:11 AM CDT	Severe Thunderstorm Warning	FGF	64 min
Jul 15, 2:56 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 15, 4:03 AM CDT	Excessive Heat Watch	FGF	24 hr
Jul 15, 3:15 PM CDT	Excessive Heat Warning	FGF	5 days
Jul 16, 6:49 AM CDT	Dense Fog Advisory	FGF	3 hr
Jul 16, 7:52 AM CDT	Mesoscale Discussion	SPC	113 min
Jul 16, 10:00 AM CDT	Mesoscale Discussion	SPC	90 min
Jul 16, 11:01 AM CDT	Severe Thunderstorm Warning	FGF	59 min
Jul 16, 4:57 PM CDT	Tornado Watch	SPC	7 hr
Jul 16, 7:10 PM CDT	Tornado Warning	FGF	50 min
Jul 16, 9:25 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 16, 11:37 PM CDT	Mesoscale Discussion	SPC	23 min
Jul 17, 9:15 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 17, 9:58 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 17, 10:24 AM CDT	Mesoscale Discussion	SPC	66 min
Jul 17, 12:49 PM CDT	Tornado Watch	SPC	3 hr
Jul 17, 1:42 PM CDT	Mesoscale Discussion	SPC	93 min
Jul 17, 2:24 PM CDT	Tornado Warning	FGF	36 min
Jul 17, 2:57 PM CDT	Tornado Warning	FGF	48 min
Jul 17, 3:34 PM CDT	Tornado Warning	FGF	41 min
Jul 17, 3:37 PM CDT	Tornado Watch	SPC	6 hr
Jul 19, 2:08 AM CDT	Mesoscale Discussion	SPC	2 hr
Jul 20, 5:02 AM CDT	Mesoscale Discussion	SPC	88 min
Jul 20, 5:25 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 22, 3:21 PM CDT	Flood Watch	FGF	19 hr
Jul 22, 10:11 PM CDT	Mesoscale Discussion	SPC	64 min
Jul 22, 10:15 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 23, 1:25 AM CDT	Mesoscale Discussion	SPC	35 min
Jul 23, 1:29 AM CDT	Severe Thunderstorm Warning	FGF	61 min
Jul 23, 1:35 AM CDT	Severe Thunderstorm Warning	FGF	55 min
Jul 24, 3:35 AM CDT	Dense Fog Advisory	FGF	5 hr
Jul 24, 2:43 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 24, 5:26 PM CDT	Mesoscale Discussion	SPC	94 min
Jul 24, 6:26 PM CDT	Severe Thunderstorm Warning	FGF	37 min
Jul 24, 6:56 PM CDT	Severe Thunderstorm Warning	FGF	39 min
Jul 26, 3:56 AM CDT	Flash Flood Watch	FGF	20 hr
Jul 28, 2:05 PM CDT	Mesoscale Discussion	SPC	115 min
Jul 29, 11:52 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 30, 3:22 PM CDT	Mesoscale Discussion	SPC	53 min
Jul 31, 10:26 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 1, 12:35 AM CDT	Mesoscale Discussion	SPC	85 min
Aug 1, 12:41 AM CDT	Severe Thunderstorm Warning	FGF	64 min
Aug 1, 1:29 AM CDT	Severe Thunderstorm Warning	FGF	46 min
Aug 1, 2:05 AM CDT	Severe Thunderstorm Warning	FGF	40 min
Aug 1, 2:31 AM CDT	Mesoscale Discussion	SPC	89 min
Aug 1, 3:56 AM CDT	Areal Flood Advisory	FGF	7 hr
Aug 1, 4:57 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 1, 5:14 AM CDT	Heat Advisory	FGF	15 hr
Aug 1, 7:17 AM CDT	Flash Flood Warning	FGF	4 hr
Aug 1, 11:52 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 1, 3:29 PM CDT	Flash Flood Watch	FGF	13 hr
Aug 1, 3:53 PM CDT	Mesoscale Discussion	SPC	67 min
Aug 1, 5:57 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 6:10 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 5, 4:20 AM CDT	Flash Flood Watch	FGF	32 hr
Aug 5, 7:32 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 5, 10:08 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 11, 6:13 PM CDT	Areal Flood Advisory	FGF	13 hr
Aug 12, 1:18 PM CDT	Mesoscale Discussion	SPC	57 min
Aug 12, 1:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 12, 3:44 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 12, 3:57 PM CDT	Severe Thunderstorm Warning	FGF	48 min
Aug 12, 4:27 PM CDT	Areal Flood Advisory	FGF	6 hr
Aug 18, 1:01 AM CDT	Severe Thunderstorm Warning	FGF	59 min
Aug 18, 3:43 PM CDT	Mesoscale Discussion	SPC	92 min
Aug 22, 7:35 PM CDT	Mesoscale Discussion	SPC	85 min
Sep 1, 12:02 AM CDT	Mesoscale Discussion	SPC	58 min
Sep 1, 12:48 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 1, 3:40 AM CDT	Mesoscale Discussion	SPC	65 min
Sep 13, 3:29 AM CDT	Freeze Watch	FGF	11 hr
Sep 13, 2:55 PM CDT	Freeze Warning	FGF	18 hr
Sep 14, 3:37 AM CDT	Freeze Warning	FGF	28 hr
Sep 19, 9:27 AM CDT	High Wind Watch	FGF	25 hr
Sep 20, 4:11 AM CDT	Wind Advisory	FGF	24 hr
Sep 21, 2:57 PM CDT	Frost Advisory	FGF	18 hr
Oct 5, 4:21 AM CDT	Red Flag Warning	FGF	41 hr
Oct 6, 4:03 AM CDT	Wind Advisory	FGF	17 hr
Oct 6, 4:26 AM CDT	Fire Weather Watch	FGF	24 hr
Oct 6, 3:08 PM CDT	High Wind Watch	FGF	13 hr
Oct 7, 4:15 AM CDT	Red Flag Warning	FGF	17 hr
Oct 7, 4:16 AM CDT	High Wind Warning	FGF	17 hr
Nov 3, 2:10 PM CDT	Fire Weather Watch	FGF	15 hr
Nov 4, 4:41 AM CDT	Red Flag Warning	FGF	15 hr
Nov 4, 4:55 AM CDT	Wind Advisory	FGF	13 hr
Nov 6, 5:00 AM CST	Wind Advisory	FGF	16 hr
Nov 15, 10:52 AM CST	Winter Weather Advisory	FGF	2 hr
Nov 15, 12:03 PM CST	Wind Advisory	FGF	6 hr
Nov 25, 3:23 PM CST	Wind Advisory	FGF	27 hr
Dec 14, 4:20 AM CST	Freezing Rain Advisory	FGF	11 hr
Dec 26, 3:56 AM CST	Wind Advisory	FGF	15 hr
Dec 28, 7:17 PM CST	Freezing Rain Advisory	FGF	8 hr
Dec 29, 3:16 PM CST	Winter Weather Advisory	FGF	15 hr
Dec 31, 4:40 AM CST	Winter Weather Advisory	FGF	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	13
Tornado Warning	4
Severe Thunderstorm Watch	15
Tornado Watch	5
Mesoscale Discussion	39
Flooding
Areal Flood Warning	3
Flash Flood Warning	1
Flash Flood Watch	3
Flood Watch	2
Areal Flood Advisory	4
Winter
Blizzard Warning	1
Winter Storm Warning	2
Winter Storm Watch	3
Freezing Rain Advisory	3
Winter Weather Advisory	12
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	2
Cold
Freeze Warning	2
Wind Chill Warning	2
Freeze Watch	1
Frost Advisory	4
Wind Chill Advisory	13
Wind and dust
High Wind Warning	3
High Wind Watch	4
Wind Advisory	14
Fire
Red Flag Warning	4
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	3

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2010 2012

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.