Alert archive / Minnesota / Norman County

Weather alerts in Norman County, Minnesota, 2019

165 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Norman County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts: 165
Warnings: 57
Watches: 20
Advisories: 47
Busiest month: January20 alerts
Busiest day: September 21, 20199 alerts

Over time

By month

Warning verification

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

1 of 2 tornado warnings covering Norman County in 2019 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 10 minutes after it went out.

Norman County, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	1	50%	2	100%	10 min
Severe thunderstorm warnings	21	17	19%	11	91%	20 min
Flash flood warnings	1	0	100%	0

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Grand Forks, ND: tornado warnings	27	13	52%	33	79%	12 min
NWS Grand Forks, ND: severe thunderstorm warnings	223	180	19%	428	85%	25 min
NWS Grand Forks, ND: flash flood warnings	13	6	54%	12	100%	154 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, 9:04 AM CST	Wind Chill Advisory	FGF	19 hr
Jan 6, 4:04 AM CST	Winter Weather Advisory	FGF	29 hr
Jan 7, 3:23 PM CST	Wind Advisory	FGF	27 hr
Jan 14, 9:52 AM CST	Dense Fog Advisory	FGF	19 hr
Jan 15, 6:29 PM CST	Wind Chill Advisory	FGF	15 hr
Jan 17, 3:36 AM CST	Wind Chill Advisory	FGF	56 hr
Jan 19, 2:59 PM CST	Wind Chill Advisory	FGF	21 hr
Jan 21, 3:43 AM CST	Winter Weather Advisory	FGF	32 hr
Jan 22, 4:01 AM CST	Winter Storm Watch	FGF	24 hr
Jan 23, 3:58 AM CST	Blizzard Warning	FGF	26 hr
Jan 23, 3:58 AM CST	Winter Weather Advisory	FGF	35 hr
Jan 23, 2:47 PM CST	Wind Chill Advisory	FGF	45 hr
Jan 25, 2:39 PM CST	Wind Chill Advisory	FGF	18 hr
Jan 26, 4:51 AM CST	Winter Storm Watch	FGF	24 hr
Jan 26, 2:42 PM CST	Wind Chill Advisory	FGF	21 hr
Jan 27, 4:21 AM CST	Blizzard Warning	FGF	24 hr
Jan 27, 4:21 AM CST	Winter Storm Warning	FGF	11 hr
Jan 27, 4:21 AM CST	Winter Weather Advisory	FGF	29 hr
Jan 28, 4:31 AM CST	Wind Chill Warning	FGF	3 days
Jan 28, 2:41 PM CST	Winter Weather Advisory	FGF	27 hr
Feb 1, 2:46 PM CST	Winter Storm Watch	FGF	37 hr
Feb 2, 2:24 PM CST	Winter Storm Warning	FGF	46 hr
Feb 3, 4:13 AM CST	Winter Weather Advisory	FGF	38 hr
Feb 4, 2:58 PM CST	Wind Chill Advisory	FGF	21 hr
Feb 5, 3:05 PM CST	Winter Storm Watch	FGF	14 hr
Feb 6, 4:41 AM CST	Winter Storm Warning	FGF	40 hr
Feb 6, 2:48 PM CST	Blizzard Warning	FGF	30 hr
Feb 7, 3:06 PM CST	Wind Chill Warning	FGF	21 hr
Feb 8, 3:31 AM CST	Wind Chill Advisory	FGF	32 hr
Feb 9, 2:25 PM CST	Wind Chill Advisory	FGF	21 hr
Feb 13, 3:34 PM CST	Winter Weather Advisory	FGF	26 hr
Feb 14, 3:19 AM CST	Wind Chill Advisory	FGF	33 hr
Feb 18, 2:43 PM CST	Wind Chill Advisory	FGF	19 hr
Feb 19, 2:51 PM CST	Winter Weather Advisory	FGF	33 hr
Feb 22, 3:07 AM CST	Winter Weather Advisory	FGF	33 hr
Feb 23, 3:29 AM CST	Winter Storm Watch	FGF	11 hr
Feb 23, 2:51 PM CST	Blizzard Warning	FGF	25 hr
Feb 23, 2:51 PM CST	Winter Weather Advisory	FGF	28 hr
Feb 24, 6:40 PM CST	Wind Chill Advisory	FGF	35 hr
Feb 26, 2:59 PM CST	Wind Chill Advisory	FGF	21 hr
Mar 2, 3:24 AM CST	Wind Chill Warning	FGF	33 hr
Mar 3, 3:53 AM CST	Wind Chill Advisory	FGF	32 hr
Mar 4, 3:59 AM CST	Winter Weather Advisory	FGF	17 hr
Mar 7, 3:18 AM CST	Winter Storm Watch	FGF	25 hr
Mar 8, 4:14 AM CST	Winter Storm Warning	FGF	50 hr
Mar 9, 11:11 AM CST	Mesoscale Discussion	SPC	4 hr
Mar 12, 4:27 AM CDT	Winter Storm Watch	FGF	33 hr
Mar 12, 6:25 PM CDT	Dense Fog Advisory	FGF	18 hr
Mar 13, 5:13 AM CDT	Blizzard Warning	FGF	38 hr
Mar 13, 1:40 PM CDT	Winter Weather Advisory	FGF	29 hr
Mar 13, 6:04 PM CDT	Winter Weather Advisory	FGF	25 hr
Mar 13, 6:26 PM CDT	Mesoscale Discussion	SPC	6 hr
Mar 16, 3:21 AM CDT	Dense Fog Advisory	FGF	8 hr
Mar 16, 6:55 PM CDT	Dense Fog Advisory	FGF	9 hr
Mar 18, 2:08 AM CDT	Dense Fog Advisory	FGF	9 hr
Mar 31, 9:59 AM CDT	River Flood Warning	FGF	13 hr
Apr 1, 8:50 PM CDT	River Flood Warning	FGF	29 days
Apr 3, 10:05 AM CDT	River Flood Warning	FGF	28 days
Apr 4, 10:40 AM CDT	River Flood Warning	FGF	21 days
Apr 4, 10:40 AM CDT	River Flood Warning	FGF	16 days
Apr 4, 6:01 PM CDT	Areal Flood Warning	FGF	6 days
Apr 5, 6:56 AM CDT	Dense Fog Advisory	FGF	6 hr
Apr 5, 9:44 PM CDT	Dense Fog Advisory	FGF	39 hr
Apr 9, 4:16 AM CDT	Winter Storm Watch	FGF	24 hr
Apr 10, 4:05 AM CDT	Winter Storm Warning	FGF	57 hr
Apr 10, 2:59 PM CDT	Areal Flood Warning	FGF	5 days
Apr 10, 3:46 PM CDT	Winter Weather Advisory	FGF	45 hr
Apr 11, 9:38 AM CDT	Mesoscale Discussion	SPC	6 hr
Apr 11, 3:48 PM CDT	Mesoscale Discussion	SPC	6 hr
Apr 15, 2:27 PM CDT	Areal Flood Warning	FGF	3 days
Apr 17, 9:47 AM CDT	River Flood Warning	FGF	12 hr
Apr 18, 2:58 PM CDT	Areal Flood Warning	FGF	4 days
Apr 24, 3:09 PM CDT	Fire Weather Watch	FGF	12 hr
Apr 25, 3:06 AM CDT	Red Flag Warning	FGF	17 hr
May 15, 9:11 PM CDT	Special Weather Statement	FGF	64 min
May 15, 9:38 PM CDT	Severe Thunderstorm Warning	FGF	37 min
May 15, 10:06 PM CDT	Severe Thunderstorm Warning	FGF	39 min
May 19, 3:45 AM CDT	Frost Advisory	FGF	28 hr
May 24, 5:43 PM CDT	Mesoscale Discussion	SPC	2 hr
May 24, 6:43 PM CDT	Severe Thunderstorm Warning	FGF	33 min
May 24, 7:12 PM CDT	Tornado Warning	FGF	33 min
May 24, 8:03 PM CDT	Severe Thunderstorm Warning	FGF	42 min
Jun 8, 12:59 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 8, 1:24 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 8, 2:12 PM CDT	Severe Thunderstorm Warning	FGF	63 min
Jun 8, 2:26 PM CDT	Severe Thunderstorm Warning	FGF	64 min
Jun 8, 3:13 PM CDT	Severe Thunderstorm Warning	FGF	62 min
Jun 8, 4:14 PM CDT	Special Weather Statement	FGF	61 min
Jun 8, 4:56 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 11, 12:50 PM CDT	Special Weather Statement	FGF	55 min
Jun 11, 1:32 PM CDT	Special Weather Statement	FGF	43 min
Jun 24, 7:18 PM CDT	Special Weather Statement	FGF	27 min
Jun 29, 11:13 AM CDT	Mesoscale Discussion	SPC	92 min
Jun 29, 12:11 PM CDT	Severe Thunderstorm Warning	FGF	64 min
Jun 29, 1:32 PM CDT	Severe Thunderstorm Warning	FGF	43 min
Jun 29, 9:39 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 29, 11:29 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 2, 3:35 PM CDT	Special Weather Statement	FGF	25 min
Jul 2, 4:33 PM CDT	Special Weather Statement	FGF	27 min
Jul 3, 4:40 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 3, 8:28 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 3, 9:14 PM CDT	Severe Thunderstorm Warning	FGF	41 min
Jul 3, 10:51 PM CDT	Special Weather Statement	FGF	24 min
Jul 8, 1:43 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 8, 5:50 PM CDT	Mesoscale Discussion	SPC	115 min
Jul 8, 7:51 PM CDT	Severe Thunderstorm Warning	FGF	54 min
Jul 8, 8:20 PM CDT	Mesoscale Discussion	SPC	55 min
Jul 8, 8:43 PM CDT	Severe Thunderstorm Warning	FGF	62 min
Jul 8, 9:43 PM CDT	Severe Thunderstorm Warning	FGF	62 min
Jul 15, 9:57 AM CDT	Mesoscale Discussion	SPC	93 min
Jul 17, 3:29 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 25, 12:55 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 25, 7:32 PM CDT	Special Weather Statement	FGF	43 min
Aug 4, 11:02 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 4, 11:29 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 5, 2:52 AM CDT	Special Weather Statement	FGF	53 min
Aug 5, 3:08 AM CDT	Mesoscale Discussion	SPC	97 min
Aug 5, 3:47 AM CDT	Special Weather Statement	FGF	43 min
Aug 17, 4:31 PM CDT	Severe Thunderstorm Warning	FGF	44 min
Aug 19, 11:22 PM CDT	Mesoscale Discussion	SPC	113 min
Aug 20, 3:10 AM CDT	Severe Thunderstorm Warning	FGF	53 min
Aug 20, 3:43 AM CDT	Severe Thunderstorm Warning	FGF	18 min
Aug 20, 4:07 AM CDT	Severe Thunderstorm Warning	FGF	23 min
Aug 20, 4:25 AM CDT	Severe Thunderstorm Warning	FGF	65 min
Aug 20, 5:23 AM CDT	Mesoscale Discussion	SPC	97 min
Aug 26, 6:16 PM CDT	Special Weather Statement	FGF	44 min
Sep 2, 3:34 PM CDT	Mesoscale Discussion	SPC	86 min
Sep 2, 4:06 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Sep 2, 6:23 PM CDT	Special Weather Statement	FGF	67 min
Sep 2, 6:25 PM CDT	Mesoscale Discussion	SPC	95 min
Sep 15, 1:52 AM CDT	Dense Fog Advisory	FGF	6 hr
Sep 20, 6:50 PM CDT	Mesoscale Discussion	SPC	85 min
Sep 20, 7:15 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Sep 20, 7:57 PM CDT	Severe Thunderstorm Warning	FGF	63 min
Sep 20, 8:55 PM CDT	Severe Thunderstorm Warning	FGF	65 min
Sep 20, 9:00 PM CDT	Tornado Warning	FGF	23 min
Sep 20, 9:27 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 21, 1:22 AM CDT	Mesoscale Discussion	SPC	83 min
Sep 21, 2:54 AM CDT	Flash Flood Warning	FGF	4 hr
Sep 21, 6:58 AM CDT	Areal Flood Warning	FGF	9 hr
Sep 21, 5:58 PM CDT	Severe Thunderstorm Warning	FGF	62 min
Sep 24, 5:16 PM CDT	Mesoscale Discussion	SPC	2 hr
Sep 30, 1:37 AM CDT	Mesoscale Discussion	SPC	113 min
Sep 30, 2:39 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Oct 3, 3:01 PM CDT	Frost Advisory	FGF	10 hr
Oct 8, 4:14 AM CDT	Winter Storm Watch	FGF	71 hr
Oct 9, 10:41 AM CDT	Winter Storm Warning	FGF	67 hr
Oct 10, 12:46 PM CDT	Blizzard Warning	FGF	48 hr
Oct 11, 2:54 AM CDT	Winter Weather Advisory	FGF	31 hr
Oct 11, 9:08 PM CDT	River Flood Warning	FGF	11 days
Oct 12, 8:33 PM CDT	River Flood Warning	FGF	10 days
Oct 21, 2:58 AM CDT	Wind Advisory	FGF	36 hr
Nov 27, 10:15 AM CST	Winter Storm Watch	FGF	52 hr
Nov 29, 4:21 AM CST	Winter Storm Warning	FGF	53 hr
Dec 8, 4:02 AM CST	Winter Weather Advisory	FGF	26 hr
Dec 8, 1:44 PM CST	Winter Storm Warning	FGF	19 hr
Dec 8, 6:48 PM CST	Mesoscale Discussion	SPC	6 hr
Dec 9, 2:17 PM CST	Wind Chill Advisory	FGF	46 hr
Dec 14, 3:29 PM CST	Wind Chill Advisory	FGF	18 hr
Dec 25, 4:04 AM CST	Winter Weather Advisory	FGF	32 hr
Dec 26, 3:31 PM CST	Winter Storm Watch	FGF	24 hr
Dec 27, 3:22 PM CST	Winter Storm Warning	FGF	61 hr
Dec 27, 3:22 PM CST	Winter Weather Advisory	FGF	70 hr
Dec 29, 4:46 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 29, 8:48 AM CST	Blizzard Warning	FGF	21 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	21
Tornado Warning	2
Severe Thunderstorm Watch	8
Mesoscale Discussion	28
Special Weather Statement	13
Flooding
Areal Flood Warning	5
Flash Flood Warning	1
River Flood Warning	8
Winter
Blizzard Warning	7
Winter Storm Warning	9
Winter Storm Watch	11
Winter Weather Advisory	18
Cold
Wind Chill Warning	3
Frost Advisory	2
Wind Chill Advisory	17
Wind and dust
Wind Advisory	2
Fire
Red Flag Warning	1
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	8

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2018 2020

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.