Alert archive / North Dakota / Oliver County

Weather alerts in Oliver County, North Dakota, 2011

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

Oliver County and its neighbors

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

Alerts: 201
Warnings: 63
Watches: 38
Advisories: 65
Busiest month: July49 alerts
Busiest day: June 13, 201113 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 6 tornado warnings covering Oliver County in 2011 had a tornado report inside them.

Oliver County, 2011

	Warnings	With a report	False alarm ratio
Tornado warnings	6	3	50%
Severe thunderstorm warnings	34	18	47%
Flash flood warnings	3	1	67%

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Bismarck, ND: tornado warnings	93	24	74%	42	67%	18 min
NWS Bismarck, ND: severe thunderstorm warnings	334	147	56%	286	85%	26 min
NWS Bismarck, ND: flash flood warnings	47	13	72%	20	85%	58 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, 3:54 PM CST	Wind Chill Advisory	BIS	12 hr
Jan 7, 3:14 PM CST	Winter Weather Advisory	BIS	51 hr
Jan 10, 3:48 PM CST	Wind Chill Advisory	BIS	20 hr
Jan 11, 3:19 PM CST	Wind Chill Advisory	BIS	21 hr
Jan 13, 3:35 PM CST	Winter Weather Advisory	BIS	37 hr
Jan 16, 1:54 PM CST	Winter Weather Advisory	BIS	18 hr
Jan 18, 3:10 PM CST	Wind Chill Advisory	BIS	18 hr
Jan 19, 3:43 PM CST	Winter Weather Advisory	BIS	16 hr
Jan 23, 4:19 AM CST	Winter Weather Advisory	BIS	32 hr
Jan 29, 3:51 AM CST	Winter Weather Advisory	BIS	57 hr
Jan 29, 4:16 PM CST	Wind Chill Advisory	BIS	72 hr
Jan 31, 3:41 PM CST	Wind Chill Warning	BIS	20 hr
Feb 1, 3:48 PM CST	Wind Chill Warning	BIS	20 hr
Feb 1, 3:48 PM CST	Wind Chill Advisory	BIS	2 hr
Feb 4, 4:40 PM CST	Winter Weather Advisory	BIS	23 hr
Feb 6, 3:16 PM CST	Wind Chill Advisory	BIS	19 hr
Feb 7, 3:32 PM CST	Wind Chill Warning	BIS	20 hr
Feb 8, 3:26 PM CST	Wind Chill Advisory	BIS	21 hr
Feb 9, 4:00 PM CST	Wind Chill Advisory	BIS	18 hr
Feb 12, 4:22 AM CST	High Wind Watch	BIS	11 hr
Feb 12, 3:27 PM CST	High Wind Warning	BIS	30 hr
Feb 16, 4:13 AM CST	Winter Weather Advisory	BIS	48 hr
Feb 16, 3:36 PM CST	Wind Advisory	BIS	22 hr
Feb 17, 3:15 PM CST	Wind Advisory	BIS	9 hr
Feb 18, 4:16 PM CST	Winter Storm Watch	BIS	23 hr
Feb 19, 3:04 PM CST	Winter Weather Advisory	BIS	37 hr
Feb 20, 4:10 AM CST	Wind Chill Advisory	BIS	29 hr
Feb 23, 3:24 PM CST	Wind Chill Advisory	BIS	45 hr
Feb 25, 3:14 PM CST	Wind Chill Advisory	BIS	23 hr
Mar 1, 10:20 AM CST	Wind Chill Advisory	BIS	24 hr
Mar 10, 3:48 PM CST	Winter Weather Advisory	BIS	20 hr
Mar 11, 3:35 AM CST	Blizzard Warning	BIS	23 hr
Mar 11, 9:43 AM CST	High Wind Warning	BIS	9 hr
Mar 11, 9:53 AM CST	Winter Weather Advisory	BIS	12 hr
Mar 15, 3:12 PM CDT	Flood Watch	BIS	6 days
Mar 17, 12:58 PM CDT	Wind Advisory	BIS	6 hr
Mar 20, 4:28 AM CDT	Winter Storm Watch	BIS	24 hr
Mar 21, 4:57 AM CDT	Winter Storm Warning	BIS	57 hr
Mar 21, 4:57 AM CDT	Winter Weather Advisory	BIS	30 hr
Mar 22, 12:05 PM CDT	Mesoscale Discussion	SPC	5 hr
Mar 31, 3:48 PM CDT	Winter Storm Watch	BIS	37 hr
Apr 2, 4:21 PM CDT	Wind Advisory	BIS	28 hr
Apr 7, 10:14 AM CDT	Areal Flood Advisory	BIS	72 hr
Apr 7, 11:42 AM CDT	River Flood Warning	BIS	71 hr
Apr 14, 3:38 AM CDT	Winter Weather Advisory	BIS	39 hr
Apr 16, 4:22 PM CDT	Winter Weather Advisory	BIS	29 hr
Apr 17, 5:32 AM CDT	Winter Storm Watch	BIS	34 hr
Apr 18, 3:57 PM CDT	Winter Weather Advisory	BIS	30 hr
Apr 20, 3:06 PM CDT	Flood Watch	BIS	46 hr
Apr 21, 4:09 PM CDT	Winter Weather Advisory	BIS	29 hr
Apr 22, 1:07 PM CDT	Areal Flood Advisory	BIS	69 hr
Apr 29, 4:32 AM CDT	Wind Advisory	BIS	14 hr
Apr 29, 4:23 PM CDT	Blizzard Warning	BIS	41 hr
May 1, 3:50 AM CDT	Wind Advisory	BIS	15 hr
May 9, 1:30 PM CDT	Areal Flood Advisory	BIS	3 hr
May 13, 8:55 AM CDT	Areal Flood Advisory	BIS	11 days
May 14, 3:09 PM CDT	Frost Advisory	BIS	18 hr
May 14, 9:59 PM CDT	Freeze Warning	BIS	11 hr
May 15, 3:21 PM CDT	Frost Advisory	BIS	13 hr
May 15, 3:21 PM CDT	Wind Advisory	BIS	30 hr
May 18, 2:34 PM CDT	Flood Watch	BIS	3 days
May 21, 10:44 AM CDT	River Flood Watch	BIS	27 hr
May 24, 11:39 AM CDT	Areal Flood Warning	BIS	20 days
May 24, 2:48 PM CDT	Frost Advisory	BIS	17 hr
May 25, 3:35 PM CDT	Frost Advisory	BIS	12 hr
May 29, 2:53 PM CDT	High Wind Watch	BIS	23 hr
May 30, 1:57 PM CDT	High Wind Warning	BIS	29 hr
May 31, 6:52 PM CDT	Wind Advisory	BIS	3 hr
Jun 2, 5:37 PM CDT	Mesoscale Discussion	SPC	83 min
Jun 2, 7:22 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 3, 3:36 AM CDT	Wind Advisory	BIS	17 hr
Jun 6, 11:25 PM CDT	Mesoscale Discussion	SPC	95 min
Jun 7, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 12, 2:19 PM CDT	Flash Flood Watch	BIS	14 hr
Jun 12, 5:42 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Jun 12, 6:07 PM CDT	Mesoscale Discussion	SPC	53 min
Jun 12, 6:28 PM CDT	Tornado Watch	SPC	6 hr
Jun 12, 6:44 PM CDT	Severe Thunderstorm Warning	BIS	40 min
Jun 12, 7:36 PM CDT	Severe Thunderstorm Warning	BIS	39 min
Jun 12, 8:05 PM CDT	Severe Thunderstorm Warning	BIS	28 min
Jun 12, 8:14 PM CDT	Severe Thunderstorm Warning	BIS	28 min
Jun 12, 8:17 PM CDT	Severe Thunderstorm Warning	BIS	28 min
Jun 12, 8:40 PM CDT	Tornado Warning	BIS	35 min
Jun 12, 9:09 PM CDT	Flash Flood Warning	BIS	4 hr
Jun 12, 9:19 PM CDT	Mesoscale Discussion	SPC	56 min
Jun 12, 9:24 PM CDT	Tornado Warning	BIS	36 min
Jun 12, 9:28 PM CDT	Flash Flood Warning	BIS	4 hr
Jun 12, 10:02 PM CDT	Areal Flood Advisory	BIS	17 hr
Jun 12, 10:09 PM CDT	Severe Thunderstorm Warning	BIS	41 min
Jun 13, 1:18 AM CDT	Areal Flood Warning	BIS	62 hr
Jun 13, 2:59 PM CDT	Areal Flood Warning	BIS	70 days
Jun 16, 4:21 AM CDT	Flash Flood Watch	BIS	42 hr
Jun 18, 5:01 PM CDT	Severe Thunderstorm Warning	BIS	59 min
Jun 18, 5:59 PM CDT	Flash Flood Warning	BIS	5 hr
Jun 18, 11:20 PM CDT	Areal Flood Warning	BIS	18 hr
Jun 19, 4:12 PM CDT	Flood Watch	BIS	51 hr
Jun 20, 2:12 PM CDT	Tornado Warning	BIS	33 min
Jun 20, 6:53 PM CDT	Areal Flood Advisory	BIS	12 hr
Jun 25, 3:22 PM CDT	Flash Flood Watch	BIS	25 hr
Jun 25, 3:24 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 25, 8:01 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 3, 11:30 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 6, 1:25 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 8, 2:13 PM CDT	Mesoscale Discussion	SPC	62 min
Jul 8, 2:32 PM CDT	Tornado Watch	SPC	9 hr
Jul 8, 6:21 PM CDT	Tornado Warning	BIS	39 min
Jul 8, 6:59 PM CDT	Severe Thunderstorm Warning	BIS	61 min
Jul 10, 10:32 AM CDT	Mesoscale Discussion	SPC	118 min
Jul 10, 11:08 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 10, 11:52 AM CDT	Severe Thunderstorm Warning	BIS	26 min
Jul 10, 12:39 PM CDT	Severe Thunderstorm Warning	BIS	31 min
Jul 10, 2:08 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 14, 5:33 PM CDT	Tornado Watch	SPC	7 hr
Jul 14, 11:01 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 15, 4:15 AM CDT	Excessive Heat Watch	BIS	11 hr
Jul 15, 3:01 PM CDT	Excessive Heat Warning	BIS	5 days
Jul 16, 7:14 AM CDT	Severe Thunderstorm Warning	BIS	61 min
Jul 16, 8:10 AM CDT	Severe Thunderstorm Warning	BIS	50 min
Jul 16, 3:53 PM CDT	Mesoscale Discussion	SPC	97 min
Jul 16, 4:57 PM CDT	Tornado Watch	SPC	7 hr
Jul 18, 4:03 PM CDT	Flash Flood Watch	BIS	6 hr
Jul 19, 2:57 PM CDT	Wind Advisory	BIS	28 hr
Jul 20, 5:02 AM CDT	Mesoscale Discussion	SPC	88 min
Jul 22, 3:56 AM CDT	Flash Flood Watch	BIS	23 hr
Jul 22, 11:05 AM CDT	Mesoscale Discussion	SPC	55 min
Jul 22, 5:17 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 22, 5:35 PM CDT	Tornado Watch	SPC	8 hr
Jul 22, 8:56 PM CDT	Mesoscale Discussion	SPC	94 min
Jul 22, 9:13 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Jul 22, 9:22 PM CDT	Severe Thunderstorm Warning	BIS	53 min
Jul 22, 10:00 PM CDT	Tornado Warning	BIS	30 min
Jul 22, 10:12 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Jul 22, 10:14 PM CDT	Severe Thunderstorm Warning	BIS	61 min
Jul 22, 10:27 PM CDT	Tornado Warning	BIS	33 min
Jul 22, 11:08 PM CDT	Severe Thunderstorm Warning	BIS	67 min
Jul 23, 3:04 AM CDT	Wind Advisory	BIS	4 hr
Jul 24, 1:04 PM CDT	Mesoscale Discussion	SPC	86 min
Jul 24, 2:43 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 24, 3:37 PM CDT	Severe Thunderstorm Warning	BIS	53 min
Jul 24, 5:26 PM CDT	Mesoscale Discussion	SPC	94 min
Jul 25, 4:04 AM CDT	Flash Flood Watch	BIS	42 hr
Jul 26, 10:45 AM CDT	Mesoscale Discussion	SPC	60 min
Jul 27, 5:51 AM CDT	Dense Fog Advisory	BIS	4 hr
Jul 29, 10:14 PM CDT	Mesoscale Discussion	SPC	61 min
Jul 29, 10:26 PM CDT	Severe Thunderstorm Warning	BIS	45 min
Jul 29, 11:06 PM CDT	Severe Thunderstorm Warning	BIS	54 min
Jul 29, 11:52 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 30, 2:48 AM CDT	Areal Flood Advisory	BIS	3 hr
Jul 31, 12:50 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 31, 5:44 PM CDT	Tornado Watch	SPC	7 hr
Jul 31, 10:00 PM CDT	Severe Thunderstorm Warning	BIS	60 min
Jul 31, 10:49 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Jul 31, 11:00 PM CDT	Severe Thunderstorm Warning	BIS	60 min
Jul 31, 11:26 PM CDT	Severe Thunderstorm Warning	BIS	64 min
Aug 1, 1:33 PM CDT	Mesoscale Discussion	SPC	57 min
Aug 1, 2:19 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 1, 5:57 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 1, 6:10 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 4, 3:49 PM CDT	Flash Flood Watch	BIS	45 hr
Aug 5, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 5, 5:23 PM CDT	Severe Thunderstorm Warning	BIS	67 min
Aug 5, 5:25 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 5, 5:42 PM CDT	Areal Flood Advisory	BIS	93 min
Aug 5, 6:04 PM CDT	Severe Thunderstorm Warning	BIS	41 min
Aug 5, 6:26 PM CDT	Mesoscale Discussion	SPC	94 min
Aug 5, 6:43 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Aug 11, 1:49 PM CDT	Mesoscale Discussion	SPC	86 min
Aug 15, 12:23 AM CDT	Severe Thunderstorm Warning	BIS	67 min
Aug 15, 3:22 AM CDT	Mesoscale Discussion	SPC	2 hr
Aug 15, 4:46 AM CDT	Severe Thunderstorm Warning	BIS	29 min
Aug 15, 5:10 AM CDT	Severe Thunderstorm Warning	BIS	65 min
Aug 15, 3:47 PM CDT	Mesoscale Discussion	SPC	58 min
Aug 15, 5:23 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 15, 9:37 PM CDT	Mesoscale Discussion	SPC	83 min
Aug 16, 9:55 AM CDT	Wind Advisory	BIS	6 hr
Aug 18, 3:43 PM CDT	Mesoscale Discussion	SPC	92 min
Aug 28, 2:09 AM CDT	Mesoscale Discussion	SPC	66 min
Aug 31, 8:24 PM CDT	Mesoscale Discussion	SPC	66 min
Aug 31, 8:53 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 31, 10:36 PM CDT	Severe Thunderstorm Warning	BIS	54 min
Aug 31, 10:54 PM CDT	Mesoscale Discussion	SPC	96 min
Aug 31, 11:25 PM CDT	Severe Thunderstorm Warning	BIS	65 min
Aug 31, 11:49 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Sep 12, 3:49 PM CDT	Freeze Watch	BIS	23 hr
Sep 13, 2:59 PM CDT	Freeze Warning	BIS	18 hr
Sep 14, 3:58 AM CDT	Freeze Warning	BIS	29 hr
Sep 19, 3:53 AM CDT	High Wind Watch	BIS	11 hr
Sep 19, 3:18 PM CDT	High Wind Warning	BIS	28 hr
Sep 21, 3:17 PM CDT	Frost Advisory	BIS	18 hr
Oct 5, 4:07 AM CDT	Wind Advisory	BIS	16 hr
Oct 6, 4:17 AM CDT	Wind Advisory	BIS	15 hr
Oct 7, 4:07 AM CDT	Wind Advisory	BIS	17 hr
Nov 6, 3:29 AM CST	Wind Advisory	BIS	17 hr
Nov 25, 4:28 AM CST	Wind Advisory	BIS	38 hr
Nov 29, 3:42 PM CST	Winter Weather Advisory	BIS	36 hr
Dec 3, 5:09 AM CST	Winter Weather Advisory	BIS	44 hr
Dec 14, 2:31 AM CST	Freezing Rain Advisory	BIS	9 hr
Dec 25, 3:33 PM CST	Wind Advisory	BIS	26 hr
Dec 29, 9:57 AM CST	Freezing Rain Advisory	BIS	11 hr
Dec 30, 4:10 AM CST	High Wind Watch	BIS	12 hr
Dec 30, 3:40 PM CST	High Wind Warning	BIS	45 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	34
Tornado Warning	6
Severe Thunderstorm Watch	10
Tornado Watch	6
Mesoscale Discussion	35
Flooding
Areal Flood Warning	4
Flash Flood Warning	3
River Flood Warning	1
Flash Flood Watch	7
Flood Watch	4
River Flood Watch	1
Areal Flood Advisory	8
Winter
Blizzard Warning	2
Winter Storm Warning	1
Winter Storm Watch	4
Freezing Rain Advisory	2
Winter Weather Advisory	18
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Cold
Freeze Warning	3
Wind Chill Warning	3
Freeze Watch	1
Frost Advisory	5
Wind Chill Advisory	13
Wind and dust
High Wind Warning	5
High Wind Watch	4
Wind Advisory	18
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 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.