Alert archive / North Dakota / Oliver County

Weather alerts in Oliver County, North Dakota, 2009

138 weather alerts in 2009, 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 2009. Tap one for its archive.

Alerts: 138
Warnings: 39
Watches: 23
Advisories: 53
Busiest month: March26 alerts
Busiest day: July 9, 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 5 tornado warnings covering Oliver County in 2009 had a tornado report inside them.

Oliver County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	0	100%	0
Severe thunderstorm warnings	15	8	47%	3	67%	5 min
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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 2, 5:09 AM CST	Winter Weather Advisory	BIS	40 hr
Jan 3, 5:12 AM CST	Winter Weather Advisory	BIS	16 hr
Jan 3, 3:29 PM CST	Wind Chill Advisory	BIS	25 hr
Jan 7, 3:42 PM CST	Winter Storm Warning	BIS	48 hr
Jan 7, 3:42 PM CST	Winter Weather Advisory	BIS	50 hr
Jan 10, 3:05 PM CST	Blizzard Watch	BIS	13 hr
Jan 11, 4:25 AM CST	Blizzard Warning	BIS	32 hr
Jan 12, 5:34 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 13, 4:51 AM CST	Wind Chill Advisory	BIS	34 hr
Jan 13, 4:51 AM CST	Winter Weather Advisory	BIS	19 hr
Jan 13, 11:50 AM CST	Mesoscale Discussion	SPC	6 hr
Jan 14, 11:23 AM CST	Wind Chill Warning	BIS	7 hr
Jan 16, 8:52 PM CST	Winter Weather Advisory	BIS	31 hr
Jan 22, 4:03 PM CST	Wind Chill Advisory	BIS	4 days
Jan 22, 4:03 PM CST	Winter Weather Advisory	BIS	14 hr
Jan 31, 4:43 AM CST	High Wind Warning	BIS	13 hr
Jan 31, 4:43 AM CST	Wind Advisory	BIS	17 hr
Jan 31, 11:10 AM CST	Wind Advisory	BIS	7 hr
Feb 1, 4:14 AM CST	Wind Advisory	BIS	15 hr
Feb 7, 3:58 PM CST	Winter Storm Watch	BIS	24 hr
Feb 8, 4:15 PM CST	Winter Storm Warning	BIS	59 hr
Feb 9, 10:57 AM CST	Dense Fog Advisory	BIS	10 hr
Feb 9, 5:52 PM CST	Mesoscale Discussion	SPC	4 hr
Feb 10, 3:56 AM CST	Winter Weather Advisory	BIS	23 hr
Feb 20, 4:00 AM CST	Winter Weather Advisory	BIS	17 hr
Feb 25, 4:36 AM CST	Winter Weather Advisory	BIS	31 hr
Feb 26, 4:00 PM CST	Wind Chill Advisory	BIS	20 hr
Mar 8, 4:03 AM CDT	Winter Storm Watch	BIS	36 hr
Mar 9, 4:25 PM CDT	Winter Weather Advisory	BIS	27 hr
Mar 10, 4:18 PM CDT	Wind Chill Advisory	BIS	20 hr
Mar 11, 11:55 AM CDT	Wind Chill Advisory	BIS	24 hr
Mar 14, 1:54 PM CDT	Areal Flood Advisory	BIS	24 hr
Mar 15, 2:03 PM CDT	Areal Flood Advisory	BIS	24 hr
Mar 16, 2:23 PM CDT	Areal Flood Advisory	BIS	51 hr
Mar 18, 5:17 PM CDT	Areal Flood Advisory	BIS	3 days
Mar 20, 3:09 PM CDT	Flood Watch	BIS	4 days
Mar 21, 5:15 AM CDT	Blizzard Watch	BIS	48 hr
Mar 21, 11:15 AM CDT	River Flood Warning	BIS	6 days
Mar 21, 10:13 PM CDT	Areal Flood Warning	BIS	12 hr
Mar 22, 5:05 AM CDT	Wind Advisory	BIS	16 hr
Mar 22, 10:22 AM CDT	Areal Flood Warning	BIS	5 days
Mar 22, 5:04 PM CDT	Blizzard Warning	BIS	50 hr
Mar 22, 10:03 PM CDT	Dense Fog Advisory	BIS	156 days
Mar 22, 10:03 PM CDT	Dense Fog Advisory	BIS	12 hr
Mar 23, 6:56 PM CDT	Mesoscale Discussion	SPC	3 hr
Mar 24, 7:03 PM CDT	Winter Weather Advisory	BIS	9 hr
Mar 25, 4:04 PM CDT	Winter Weather Advisory	BIS	12 hr
Mar 26, 12:43 PM CDT	Winter Weather Advisory	BIS	7 hr
Mar 27, 3:20 PM CDT	Areal Flood Warning	BIS	4 days
Mar 29, 5:29 AM CDT	Winter Weather Advisory	BIS	59 hr
Mar 29, 10:05 PM CDT	Mesoscale Discussion	SPC	6 hr
Mar 30, 1:01 AM CDT	Winter Storm Warning	BIS	15 hr
Mar 30, 6:36 AM CDT	Mesoscale Discussion	SPC	4 hr
Apr 10, 10:29 AM CDT	River Flood Warning	BIS	7 days
Apr 12, 1:21 PM CDT	Areal Flood Warning	BIS	8 days
Apr 15, 11:38 AM CDT	Wind Advisory	BIS	9 hr
May 12, 3:19 PM CDT	Mesoscale Discussion	SPC	56 min
May 12, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 12, 6:06 PM CDT	Severe Thunderstorm Warning	BIS	39 min
May 12, 6:48 PM CDT	Severe Thunderstorm Warning	BIS	57 min
May 13, 3:27 AM CDT	Wind Advisory	BIS	18 hr
May 14, 3:15 PM CDT	Freeze Watch	BIS	25 hr
May 15, 3:46 PM CDT	Freeze Warning	BIS	17 hr
May 17, 4:57 AM CDT	Freeze Watch	BIS	35 hr
Jun 2, 3:32 PM CDT	Frost Advisory	BIS	16 hr
Jun 10, 4:16 PM CDT	Frost Advisory	BIS	16 hr
Jun 16, 1:23 PM CDT	Mesoscale Discussion	SPC	97 min
Jun 16, 4:43 PM CDT	Areal Flood Advisory	BIS	6 hr
Jun 22, 1:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 3:06 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 22, 4:18 PM CDT	Severe Thunderstorm Warning	BIS	42 min
Jun 22, 4:39 PM CDT	Tornado Warning	BIS	36 min
Jun 22, 5:06 PM CDT	Tornado Warning	BIS	24 min
Jun 22, 5:30 PM CDT	Severe Thunderstorm Warning	BIS	60 min
Jun 22, 6:28 PM CDT	Mesoscale Discussion	SPC	92 min
Jun 26, 2:13 PM CDT	Mesoscale Discussion	SPC	62 min
Jun 26, 2:53 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 26, 6:23 PM CDT	Tornado Warning	BIS	37 min
Jun 26, 6:43 PM CDT	Tornado Watch	SPC	4 hr
Jun 26, 8:08 PM CDT	Severe Thunderstorm Warning	BIS	52 min
Jun 27, 1:39 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 27, 3:16 PM CDT	Mesoscale Discussion	SPC	59 min
Jul 7, 6:43 AM CDT	Areal Flood Advisory	BIS	6 hr
Jul 8, 3:20 PM CDT	Tornado Watch	SPC	8 hr
Jul 8, 6:46 PM CDT	Mesoscale Discussion	SPC	89 min
Jul 8, 8:58 PM CDT	Severe Thunderstorm Warning	BIS	62 min
Jul 8, 9:42 PM CDT	Mesoscale Discussion	SPC	93 min
Jul 8, 9:54 PM CDT	Severe Thunderstorm Warning	BIS	66 min
Jul 8, 10:13 PM CDT	Tornado Warning	BIS	32 min
Jul 8, 10:23 PM CDT	Areal Flood Advisory	BIS	6 hr
Jul 8, 10:29 PM CDT	Severe Thunderstorm Watch PDS	SPC	6 hr
Jul 8, 10:55 PM CDT	Severe Thunderstorm Warning	BIS	65 min
Jul 8, 11:27 PM CDT	Mesoscale Discussion	SPC	93 min
Jul 11, 8:01 PM CDT	Mesoscale Discussion	SPC	59 min
Jul 11, 11:48 PM CDT	Severe Thunderstorm Warning	BIS	57 min
Jul 12, 12:00 AM CDT	Tornado Warning	BIS	30 min
Jul 12, 12:29 AM CDT	Severe Thunderstorm Warning	BIS	38 min
Jul 13, 2:52 PM CDT	Flash Flood Watch	BIS	13 hr
Jul 19, 7:28 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 2, 2:35 PM CDT	Mesoscale Discussion	SPC	115 min
Aug 14, 12:33 AM CDT	Mesoscale Discussion	SPC	87 min
Aug 19, 12:16 PM CDT	Mesoscale Discussion	SPC	119 min
Aug 23, 8:55 PM CDT	Tornado Watch	SPC	5 hr
Sep 8, 1:44 AM CDT	Mesoscale Discussion	SPC	91 min
Sep 8, 2:38 AM CDT	Severe Thunderstorm Warning	BIS	67 min
Sep 8, 3:23 AM CDT	Severe Thunderstorm Warning	BIS	37 min
Sep 10, 4:53 PM CDT	Mesoscale Discussion	SPC	97 min
Sep 10, 7:29 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 10, 9:19 PM CDT	Severe Thunderstorm Warning	BIS	56 min
Sep 10, 9:26 PM CDT	Severe Thunderstorm Warning	BIS	54 min
Sep 10, 10:12 PM CDT	Severe Thunderstorm Warning	BIS	63 min
Sep 10, 10:28 PM CDT	Mesoscale Discussion	SPC	92 min
Sep 10, 11:45 PM CDT	Mesoscale Discussion	SPC	90 min
Sep 26, 3:20 PM CDT	Wind Advisory	BIS	30 hr
Sep 28, 3:38 AM CDT	Frost Advisory	BIS	29 hr
Sep 30, 4:00 AM CDT	Wind Advisory	BIS	15 hr
Sep 30, 3:52 PM CDT	Wind Advisory	BIS	30 hr
Oct 5, 4:14 AM CDT	Freeze Watch	BIS	12 hr
Oct 5, 4:14 PM CDT	Freeze Warning	BIS	18 hr
Oct 7, 4:18 AM CDT	Freeze Watch	BIS	11 hr
Oct 7, 3:19 PM CDT	Freeze Warning	BIS	21 hr
Oct 8, 4:54 AM CDT	Freeze Warning	BIS	29 hr
Oct 14, 4:55 AM CDT	Winter Weather Advisory	BIS	31 hr
Oct 27, 4:07 PM CDT	Winter Storm Watch	BIS	44 hr
Oct 28, 3:46 PM CDT	Winter Weather Advisory	BIS	36 hr
Nov 12, 7:34 AM CST	Dense Fog Advisory	BIS	2 hr
Nov 30, 4:01 PM CST	Wind Advisory	BIS	26 hr
Dec 8, 2:15 PM CST	Wind Chill Advisory	BIS	44 hr
Dec 12, 4:57 AM CST	Wind Chill Advisory	BIS	31 hr
Dec 13, 3:49 PM CST	Wind Chill Advisory	BIS	20 hr
Dec 14, 4:04 PM CST	Wind Chill Advisory	BIS	20 hr
Dec 18, 8:23 PM CST	Freezing Fog Advisory	BIS	15 hr
Dec 20, 3:43 AM CST	Freezing Fog Advisory	BIS	11 hr
Dec 22, 3:44 AM CST	Winter Storm Watch	BIS	24 hr
Dec 23, 3:15 AM CST	Blizzard Watch	BIS	37 hr
Dec 23, 3:15 AM CST	Winter Storm Warning	BIS	51 hr
Dec 23, 3:15 AM CST	Winter Weather Advisory	BIS	4 days
Dec 24, 3:17 AM CST	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	15
Tornado Warning	5
Severe Thunderstorm Watch	7
Tornado Watch	3
Mesoscale Discussion	23
Flooding
Areal Flood Warning	4
River Flood Warning	2
Flash Flood Watch	1
Flood Watch	1
Areal Flood Advisory	7
Winter
Blizzard Warning	3
Winter Storm Warning	4
Blizzard Watch	3
Winter Storm Watch	4
Winter Weather Advisory	17
Cold
Freeze Warning	4
Wind Chill Warning	1
Freeze Watch	4
Frost Advisory	3
Wind Chill Advisory	10
Wind and dust
High Wind Warning	1
Wind Advisory	10
Fog and smoke
Dense Fog Advisory	4
Freezing Fog Advisory	2

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.