Alert archive / North Dakota / Grant County

Weather alerts in Grant County, North Dakota, 2009

170 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Grant County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts: 170
Warnings: 55
Watches: 29
Advisories: 55
Busiest month: June33 alerts
Busiest day: May 12, 20098 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 7 tornado warnings covering Grant County in 2009 had a tornado report inside them.

Grant County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning
Tornado warnings	7	0	100%	0
Severe thunderstorm warnings	22	6	73%	1	0%
Flash flood warnings	0			0

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	56	11	80%	19	79%	13 min
NWS Bismarck, ND: severe thunderstorm warnings	180	61	66%	124	70%	23 min
NWS Bismarck, ND: flash flood warnings	15	2	87%	2	100%	46 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 3, 4:12 AM MST	Winter Weather Advisory	BIS	16 hr
Jan 3, 2:29 PM MST	Wind Chill Advisory	BIS	25 hr
Jan 7, 2:42 PM MST	Winter Storm Warning	BIS	48 hr
Jan 7, 2:42 PM MST	Winter Weather Advisory	BIS	50 hr
Jan 8, 11:55 AM MST	Mesoscale Discussion	SPC	5 hr
Jan 10, 2:05 PM MST	Blizzard Watch	BIS	13 hr
Jan 11, 3:25 AM MST	Blizzard Warning	BIS	32 hr
Jan 12, 4:34 AM MST	Mesoscale Discussion	SPC	4 hr
Jan 13, 3:51 AM MST	Wind Chill Advisory	BIS	34 hr
Jan 13, 3:51 AM MST	Winter Weather Advisory	BIS	19 hr
Jan 13, 3:10 PM MST	Wind Chill Advisory	BIS	23 hr
Jan 16, 7:52 PM MST	Winter Weather Advisory	BIS	31 hr
Jan 22, 3:03 PM MST	Wind Chill Advisory	BIS	4 days
Jan 22, 3:03 PM MST	Winter Weather Advisory	BIS	14 hr
Jan 31, 3:43 AM MST	High Wind Warning	BIS	13 hr
Jan 31, 3:43 AM MST	Wind Advisory	BIS	17 hr
Jan 31, 10:10 AM MST	Wind Advisory	BIS	7 hr
Feb 1, 3:14 AM MST	Wind Advisory	BIS	15 hr
Feb 7, 2:58 PM MST	Winter Storm Watch	BIS	24 hr
Feb 8, 3:15 PM MST	Winter Storm Warning	BIS	59 hr
Feb 9, 4:52 PM MST	Mesoscale Discussion	SPC	4 hr
Feb 10, 2:56 AM MST	Winter Weather Advisory	BIS	23 hr
Feb 20, 3:00 AM MST	Winter Weather Advisory	BIS	17 hr
Feb 25, 3:36 AM MST	Winter Weather Advisory	BIS	31 hr
Feb 25, 9:20 PM MST	Mesoscale Discussion	SPC	6 hr
Feb 26, 3:00 PM MST	Wind Chill Advisory	BIS	20 hr
Feb 26, 3:00 PM MST	Winter Weather Advisory	BIS	26 hr
Mar 8, 3:03 AM MDT	Winter Storm Watch	BIS	36 hr
Mar 9, 3:25 PM MDT	Winter Storm Warning	BIS	24 hr
Mar 10, 3:18 PM MDT	Wind Chill Advisory	BIS	20 hr
Mar 11, 10:55 AM MDT	Wind Chill Advisory	BIS	24 hr
Mar 14, 12:54 PM MDT	Areal Flood Advisory	BIS	24 hr
Mar 15, 1:03 PM MDT	Areal Flood Advisory	BIS	24 hr
Mar 16, 1:23 PM MDT	Areal Flood Advisory	BIS	51 hr
Mar 18, 10:00 AM MDT	Areal Flood Warning	BIS	36 hr
Mar 18, 4:17 PM MDT	Areal Flood Advisory	BIS	3 days
Mar 19, 1:19 AM MDT	Areal Flood Warning	BIS	12 hr
Mar 19, 12:39 PM MDT	Areal Flood Warning	BIS	58 hr
Mar 20, 2:09 PM MDT	Flood Watch	BIS	4 days
Mar 21, 4:15 AM MDT	Blizzard Watch	BIS	48 hr
Mar 21, 9:13 PM MDT	Areal Flood Warning	BIS	12 hr
Mar 22, 4:05 AM MDT	Wind Advisory	BIS	16 hr
Mar 22, 9:22 AM MDT	Areal Flood Warning	BIS	5 days
Mar 22, 4:04 PM MDT	Blizzard Warning	BIS	50 hr
Mar 22, 7:49 PM MDT	River Flood Warning	BIS	4 days
Mar 22, 9:03 PM MDT	Dense Fog Advisory	BIS	156 days
Mar 22, 9:03 PM MDT	Dense Fog Advisory	BIS	12 hr
Mar 23, 5:56 PM MDT	Mesoscale Discussion	SPC	3 hr
Mar 24, 6:03 PM MDT	Winter Weather Advisory	BIS	9 hr
Mar 26, 11:43 AM MDT	Winter Weather Advisory	BIS	7 hr
Mar 27, 2:20 PM MDT	Areal Flood Warning	BIS	4 days
Mar 28, 4:17 AM MDT	Blizzard Watch	BIS	24 hr
Mar 29, 4:29 AM MDT	Blizzard Warning	BIS	55 hr
Mar 29, 9:05 PM MDT	Mesoscale Discussion	SPC	6 hr
Mar 30, 5:36 AM MDT	Mesoscale Discussion	SPC	4 hr
Apr 2, 2:36 PM MDT	Winter Weather Advisory	BIS	45 hr
Apr 12, 12:21 PM MDT	Areal Flood Warning	BIS	8 days
Apr 13, 2:33 PM MDT	River Flood Warning	BIS	69 hr
Apr 15, 10:38 AM MDT	Wind Advisory	BIS	9 hr
Apr 21, 3:25 AM MDT	Areal Flood Warning	BIS	11 hr
Apr 28, 3:24 AM MDT	Wind Advisory	BIS	11 hr
May 12, 2:19 PM MDT	Mesoscale Discussion	SPC	56 min
May 12, 2:36 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
May 12, 2:44 PM MDT	High Wind Watch	BIS	12 hr
May 12, 4:54 PM MDT	Mesoscale Discussion	SPC	96 min
May 12, 5:01 PM MDT	Severe Thunderstorm Warning	BIS	59 min
May 12, 5:06 PM MDT	Severe Thunderstorm Warning	BIS	39 min
May 12, 5:27 PM MDT	Severe Thunderstorm Warning	BIS	63 min
May 12, 5:48 PM MDT	Severe Thunderstorm Warning	BIS	57 min
May 12, 6:03 PM MDT	Severe Thunderstorm Warning	BIS	57 min
May 13, 2:27 AM MDT	Wind Advisory	BIS	18 hr
May 14, 2:15 PM MDT	Freeze Watch	BIS	25 hr
May 15, 2:46 PM MDT	Freeze Warning	BIS	17 hr
May 17, 3:57 AM MDT	Freeze Watch	BIS	35 hr
Jun 10, 3:16 PM MDT	Frost Advisory	BIS	16 hr
Jun 16, 12:23 PM MDT	Mesoscale Discussion	SPC	97 min
Jun 16, 1:05 PM MDT	Tornado Watch	SPC	6 hr
Jun 16, 2:26 PM MDT	Mesoscale Discussion	SPC	64 min
Jun 16, 3:43 PM MDT	Areal Flood Advisory	BIS	6 hr
Jun 16, 4:39 PM MDT	Mesoscale Discussion	SPC	96 min
Jun 18, 11:04 AM MDT	Areal Flood Advisory	BIS	6 hr
Jun 18, 11:48 AM MDT	Severe Thunderstorm Warning	BIS	57 min
Jun 21, 12:57 PM MDT	Mesoscale Discussion	SPC	93 min
Jun 21, 4:43 PM MDT	Mesoscale Discussion	SPC	92 min
Jun 22, 2:06 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 22, 4:00 PM MDT	Severe Thunderstorm Warning	BIS	60 min
Jun 22, 4:05 PM MDT	Severe Thunderstorm Warning	BIS	55 min
Jun 22, 4:40 PM MDT	Severe Thunderstorm Warning	BIS	65 min
Jun 22, 5:28 PM MDT	Mesoscale Discussion	SPC	92 min
Jun 24, 6:21 PM MDT	Mesoscale Discussion	SPC	84 min
Jun 24, 6:28 PM MDT	Tornado Warning	BIS	32 min
Jun 24, 6:59 PM MDT	Tornado Warning	BIS	31 min
Jun 24, 7:26 PM MDT	Severe Thunderstorm Warning	BIS	13 min
Jun 26, 3:25 AM MDT	Flash Flood Watch	BIS	24 hr
Jun 26, 1:13 PM MDT	Mesoscale Discussion	SPC	62 min
Jun 26, 1:53 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 26, 5:05 PM MDT	Tornado Warning	BIS	25 min
Jun 26, 5:22 PM MDT	Tornado Warning	BIS	23 min
Jun 26, 5:42 PM MDT	Tornado Warning	BIS	33 min
Jun 26, 6:12 PM MDT	Severe Thunderstorm Warning	BIS	63 min
Jun 26, 6:43 PM MDT	Severe Thunderstorm Warning	BIS	62 min
Jun 26, 7:08 PM MDT	Severe Thunderstorm Warning	BIS	52 min
Jun 27, 11:37 AM MDT	Mesoscale Discussion	SPC	53 min
Jun 27, 12:39 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 27, 1:58 PM MDT	Severe Thunderstorm Warning	BIS	43 min
Jun 27, 2:16 PM MDT	Mesoscale Discussion	SPC	59 min
Jun 27, 4:02 PM MDT	Mesoscale Discussion	SPC	58 min
Jul 8, 2:20 PM MDT	Tornado Watch	SPC	8 hr
Jul 8, 5:46 PM MDT	Mesoscale Discussion	SPC	89 min
Jul 8, 7:58 PM MDT	Severe Thunderstorm Warning	BIS	62 min
Jul 8, 8:42 PM MDT	Mesoscale Discussion	SPC	93 min
Jul 8, 8:54 PM MDT	Severe Thunderstorm Warning	BIS	66 min
Jul 8, 9:29 PM MDT	Severe Thunderstorm Watch PDS	SPC	6 hr
Jul 8, 9:58 PM MDT	Severe Thunderstorm Warning	BIS	62 min
Jul 8, 10:27 PM MDT	Mesoscale Discussion	SPC	93 min
Jul 9, 2:07 AM MDT	Mesoscale Discussion	SPC	83 min
Jul 11, 7:13 PM MDT	Severe Thunderstorm Warning	BIS	62 min
Jul 11, 7:40 PM MDT	Tornado Warning	BIS	35 min
Jul 11, 8:12 PM MDT	Tornado Warning	BIS	33 min
Jul 13, 6:09 AM MDT	Severe Thunderstorm Warning	BIS	51 min
Jul 13, 9:21 AM MDT	Severe Thunderstorm Warning	BIS	34 min
Jul 13, 9:38 AM MDT	Mesoscale Discussion	SPC	97 min
Jul 13, 9:57 AM MDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 13, 12:58 PM MDT	Areal Flood Advisory	BIS	6 hr
Jul 13, 1:52 PM MDT	Flash Flood Watch	BIS	13 hr
Jul 19, 6:28 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 2, 1:35 PM MDT	Mesoscale Discussion	SPC	115 min
Aug 19, 11:16 AM MDT	Mesoscale Discussion	SPC	119 min
Aug 23, 7:55 PM MDT	Tornado Watch	SPC	5 hr
Sep 8, 12:44 AM MDT	Mesoscale Discussion	SPC	91 min
Sep 8, 1:38 AM MDT	Severe Thunderstorm Warning	BIS	67 min
Sep 10, 3:53 PM MDT	Mesoscale Discussion	SPC	97 min
Sep 10, 6:29 PM MDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 10, 9:28 PM MDT	Mesoscale Discussion	SPC	92 min
Sep 10, 10:00 PM MDT	Severe Thunderstorm Warning	BIS	60 min
Sep 10, 10:23 PM MDT	Areal Flood Advisory	BIS	3 hr
Sep 10, 10:45 PM MDT	Mesoscale Discussion	SPC	90 min
Sep 18, 2:54 AM MDT	Fire Weather Watch	BIS	25 hr
Sep 19, 3:31 AM MDT	Red Flag Warning	BIS	15 hr
Sep 21, 7:44 AM MDT	Wind Advisory	BIS	7 hr
Sep 22, 2:18 PM MDT	Frost Advisory	BIS	16 hr
Sep 26, 2:56 AM MDT	Fire Weather Watch	BIS	24 hr
Sep 26, 2:20 PM MDT	Wind Advisory	BIS	30 hr
Sep 27, 2:34 AM MDT	Red Flag Warning	BIS	17 hr
Sep 28, 2:38 AM MDT	Frost Advisory	BIS	29 hr
Sep 28, 3:13 AM MDT	Fire Weather Watch	BIS	24 hr
Sep 29, 3:02 AM MDT	Red Flag Warning	BIS	16 hr
Sep 30, 3:00 AM MDT	Wind Advisory	BIS	15 hr
Sep 30, 2:52 PM MDT	Wind Advisory	BIS	30 hr
Oct 2, 3:30 AM MDT	Wind Advisory	BIS	12 hr
Oct 4, 3:21 PM MDT	Winter Weather Advisory	BIS	39 hr
Oct 5, 3:14 PM MDT	Freeze Warning	BIS	18 hr
Oct 7, 3:18 AM MDT	Freeze Watch	BIS	11 hr
Oct 7, 2:19 PM MDT	Freeze Warning	BIS	21 hr
Oct 8, 3:54 AM MDT	Freeze Warning	BIS	29 hr
Oct 14, 3:55 AM MDT	Winter Weather Advisory	BIS	31 hr
Oct 27, 3:07 PM MDT	Winter Storm Watch	BIS	44 hr
Oct 28, 2:46 PM MDT	Winter Weather Advisory	BIS	36 hr
Nov 12, 6:34 AM MST	Dense Fog Advisory	BIS	2 hr
Nov 30, 3:01 PM MST	Wind Advisory	BIS	26 hr
Dec 8, 1:15 PM MST	Wind Chill Advisory	BIS	44 hr
Dec 12, 3:57 AM MST	Wind Chill Advisory	BIS	31 hr
Dec 13, 2:49 PM MST	Wind Chill Advisory	BIS	20 hr
Dec 14, 3:04 PM MST	Wind Chill Advisory	BIS	20 hr
Dec 20, 2:43 AM MST	Freezing Fog Advisory	BIS	11 hr
Dec 22, 2:44 AM MST	Winter Storm Watch	BIS	24 hr
Dec 23, 2:15 AM MST	Blizzard Watch	BIS	37 hr
Dec 23, 2:15 AM MST	Winter Storm Warning	BIS	51 hr
Dec 23, 2:15 AM MST	Winter Weather Advisory	BIS	4 days
Dec 24, 2:17 AM MST	Blizzard Warning	BIS	68 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	22
Tornado Warning	7
Severe Thunderstorm Watch	8
Tornado Watch	3
Mesoscale Discussion	31
Flooding
Areal Flood Warning	8
River Flood Warning	2
Flash Flood Watch	2
Flood Watch	1
Areal Flood Advisory	8
Winter
Blizzard Warning	4
Winter Storm Warning	4
Blizzard Watch	4
Winter Storm Watch	4
Winter Weather Advisory	16
Cold
Freeze Warning	4
Freeze Watch	3
Frost Advisory	3
Wind Chill Advisory	11
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	13
Fire
Red Flag Warning	3
Fire Weather Watch	3
Fog and smoke
Dense Fog Advisory	3
Freezing 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 2008 2010

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.