Alert archive / Minnesota / Hennepin County

Weather alerts in Hennepin County, Minnesota, 2012

151 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Hennepin County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts: 151
Warnings: 47
Watches: 26
Advisories: 27
Busiest month: May44 alerts
Busiest day: May 28, 201212 alerts

Over time

By month

Warning verification

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

Hennepin County, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	32	21	34%	23	74%	21 min
Flash flood warnings	2	0	100%	1	0%

Each office's whole area, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Twin Cities, MN: tornado warnings	39	6	85%	21	33%	10 min
NWS Twin Cities, MN: severe thunderstorm warnings	282	145	49%	470	70%	22 min
NWS Twin Cities, MN: flash flood warnings	14	6	57%	26	42%	153 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
Dec 31, 8:54 PM CST	Winter Weather Advisory	MPX	7 hr
Jan 22, 4:48 AM CST	Freezing Rain Advisory	MPX	11 hr
Jan 22, 3:41 PM CST	Winter Weather Advisory	MPX	24 hr
Feb 1, 7:48 PM CST	Dense Fog Advisory	MPX	14 hr
Feb 2, 2:46 PM CST	Dense Fog Advisory	MPX	19 hr
Feb 4, 1:46 AM CST	Dense Fog Advisory	MPX	8 hr
Feb 20, 4:58 AM CST	Winter Weather Advisory	MPX	25 hr
Feb 26, 3:38 AM CST	Winter Storm Watch	MPX	37 hr
Feb 27, 4:26 PM CST	Winter Storm Warning	MPX	46 hr
Feb 27, 4:26 PM CST	Winter Weather Advisory	MPX	46 hr
Feb 28, 2:40 PM CST	Mesoscale Discussion	SPC	4 hr
Mar 19, 6:43 PM CDT	Mesoscale Discussion	SPC	62 min
Mar 19, 7:12 PM CDT	Severe Thunderstorm Warning	MPX	33 min
Mar 19, 7:37 PM CDT	Severe Thunderstorm Warning	MPX	38 min
Mar 26, 2:19 PM CDT	Wind Advisory	MPX	29 hr
Apr 7, 3:14 PM CDT	Fire Weather Watch	MPX	13 hr
Apr 8, 4:23 AM CDT	Red Flag Warning	MPX	16 hr
Apr 8, 3:21 PM CDT	Freeze Watch	MPX	11 hr
Apr 9, 2:37 AM CDT	Freeze Warning	MPX	31 hr
Apr 9, 8:48 PM CDT	Freeze Warning	MPX	37 hr
Apr 11, 2:28 PM CDT	Freeze Warning	MPX	19 hr
Apr 15, 3:37 PM CDT	Tornado Watch	SPC	7 hr
Apr 15, 5:54 PM CDT	Mesoscale Discussion	SPC	96 min
Apr 15, 6:30 PM CDT	Special Weather Statement	MPX	30 min
May 1, 6:10 PM CDT	Tornado Watch	SPC	6 hr
May 1, 6:11 PM CDT	Mesoscale Discussion	SPC	94 min
May 2, 11:06 PM CDT	Mesoscale Discussion	SPC	24 min
May 3, 1:59 AM CDT	Special Weather Statement	MPX	76 min
May 3, 9:37 AM CDT	Special Weather Statement	MPX	38 min
May 5, 9:51 PM CDT	Mesoscale Discussion	SPC	84 min
May 5, 11:31 PM CDT	Mesoscale Discussion	SPC	89 min
May 6, 1:35 AM CDT	Special Weather Statement	MPX	40 min
May 6, 1:44 AM CDT	Severe Thunderstorm Warning	MPX	46 min
May 17, 9:39 AM CDT	Wind Advisory	MPX	9 hr
May 18, 4:54 PM CDT	Mesoscale Discussion	SPC	66 min
May 19, 1:49 PM CDT	Mesoscale Discussion	SPC	86 min
May 19, 5:53 PM CDT	Severe Thunderstorm Warning	MPX	52 min
May 19, 6:17 PM CDT	Severe Thunderstorm Warning	MPX	43 min
May 19, 6:33 PM CDT	Severe Thunderstorm Warning	MPX	27 min
May 19, 6:36 PM CDT	Severe Thunderstorm Warning	MPX	54 min
May 19, 6:54 PM CDT	Severe Thunderstorm Warning	MPX	38 min
May 19, 7:05 PM CDT	Severe Thunderstorm Warning	MPX	40 min
May 19, 7:31 PM CDT	Severe Thunderstorm Warning	MPX	59 min
May 19, 7:51 PM CDT	Severe Thunderstorm Warning	MPX	38 min
May 19, 8:06 PM CDT	Areal Flood Advisory	MPX	3 hr
May 23, 3:23 AM CDT	Flash Flood Watch	MPX	34 hr
May 23, 5:27 PM CDT	Mesoscale Discussion	SPC	93 min
May 24, 1:23 AM CDT	Areal Flood Advisory	MPX	3 hr
May 24, 9:36 AM CDT	Special Weather Statement	MPX	24 min
May 24, 1:50 PM CDT	Areal Flood Advisory	MPX	3 hr
May 27, 3:32 AM CDT	Flash Flood Watch	MPX	26 hr
May 27, 9:08 AM CDT	River Flood Watch	MPX	5 days
May 27, 9:08 AM CDT	River Flood Watch	MPX	47 hr
May 27, 9:08 AM CDT	River Flood Watch	MPX	50 hr
May 27, 3:49 PM CDT	Mesoscale Discussion	SPC	56 min
May 27, 6:08 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 27, 7:27 PM CDT	Severe Thunderstorm Warning	MPX	48 min
May 27, 7:45 PM CDT	Severe Thunderstorm Warning	MPX	45 min
May 27, 7:47 PM CDT	Mesoscale Discussion	SPC	88 min
May 27, 8:22 PM CDT	Areal Flood Advisory	MPX	6 hr
May 27, 8:24 PM CDT	Severe Thunderstorm Warning	MPX	51 min
May 27, 9:27 PM CDT	Flash Flood Warning	MPX	6 hr
May 27, 9:46 PM CDT	Flash Flood Warning	MPX	6 hr
May 27, 10:11 PM CDT	Mesoscale Discussion	SPC	94 min
May 28, 9:34 AM CDT	River Flood Warning	MPX	6 days
May 28, 1:48 PM CDT	Mesoscale Discussion	SPC	57 min
May 28, 2:07 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 28, 3:58 PM CDT	Mesoscale Discussion	SPC	92 min
Jun 10, 3:03 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 10, 5:38 PM CDT	Mesoscale Discussion	SPC	67 min
Jun 10, 6:37 PM CDT	Special Weather Statement	MPX	53 min
Jun 10, 7:35 PM CDT	Special Weather Statement	MPX	55 min
Jun 10, 7:41 PM CDT	Severe Thunderstorm Warning	MPX	49 min
Jun 10, 7:54 PM CDT	Severe Thunderstorm Warning	MPX	36 min
Jun 10, 8:32 PM CDT	Severe Thunderstorm Warning	MPX	58 min
Jun 14, 7:37 AM CDT	Mesoscale Discussion	SPC	113 min
Jun 14, 8:48 AM CDT	Areal Flood Advisory	MPX	3 hr
Jun 14, 9:11 AM CDT	Special Weather Statement	MPX	49 min
Jun 14, 9:41 AM CDT	Areal Flood Advisory	MPX	3 hr
Jun 14, 10:22 AM CDT	Special Weather Statement	MPX	38 min
Jun 14, 12:26 PM CDT	Severe Thunderstorm Warning	MPX	49 min
Jun 14, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 17, 7:27 PM CDT	Mesoscale Discussion	SPC	93 min
Jun 17, 7:57 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 17, 9:45 PM CDT	Severe Thunderstorm Warning	MPX	45 min
Jun 17, 9:50 PM CDT	Severe Thunderstorm Warning	MPX	40 min
Jun 17, 10:08 PM CDT	Areal Flood Advisory	MPX	3 hr
Jun 17, 10:24 PM CDT	Severe Thunderstorm Warning	MPX	51 min
Jun 18, 1:28 AM CDT	Mesoscale Discussion	SPC	62 min
Jun 18, 4:31 PM CDT	Flash Flood Watch	MPX	56 hr
Jun 19, 2:39 AM CDT	Mesoscale Discussion	SPC	66 min
Jun 19, 2:43 AM CDT	Special Weather Statement	MPX	62 min
Jun 19, 3:25 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 19, 3:50 AM CDT	Severe Thunderstorm Warning	MPX	40 min
Jun 19, 4:16 AM CDT	Mesoscale Discussion	SPC	89 min
Jun 19, 12:25 PM CDT	River Flood Watch	MPX	10 hr
Jun 19, 9:20 PM CDT	River Flood Warning	MPX	4 days
Jun 25, 5:22 PM CDT	River Flood Warning	MPX	62 hr
Jun 26, 2:21 PM CDT	Heat Advisory	MPX	30 hr
Jul 1, 4:14 PM CDT	Heat Advisory	MPX	37 hr
Jul 2, 3:06 PM CDT	Excessive Heat Warning	MPX	4 days
Jul 3, 2:00 AM CDT	Mesoscale Discussion	SPC	90 min
Jul 3, 2:53 AM CDT	Special Weather Statement	MPX	37 min
Jul 3, 3:25 AM CDT	Severe Thunderstorm Warning	MPX	50 min
Jul 6, 6:02 PM CDT	Mesoscale Discussion	SPC	28 min
Jul 6, 6:39 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 6, 9:33 PM CDT	Mesoscale Discussion	SPC	57 min
Jul 13, 1:35 PM CDT	Mesoscale Discussion	SPC	55 min
Jul 13, 4:08 PM CDT	Special Weather Statement	MPX	37 min
Jul 13, 4:13 PM CDT	Severe Thunderstorm Warning	MPX	62 min
Jul 13, 4:39 PM CDT	Severe Thunderstorm Warning	MPX	41 min
Jul 13, 5:08 PM CDT	Severe Thunderstorm Warning	MPX	52 min
Jul 13, 5:39 PM CDT	Areal Flood Advisory	MPX	52 min
Jul 15, 3:41 AM CDT	Heat Advisory	MPX	41 hr
Jul 18, 9:07 AM CDT	Special Weather Statement	MPX	38 min
Aug 1, 1:07 PM CDT	Mesoscale Discussion	SPC	23 min
Aug 1, 4:14 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 1, 5:12 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 1, 7:35 PM CDT	Mesoscale Discussion	SPC	55 min
Aug 1, 8:48 PM CDT	Severe Thunderstorm Warning	MPX	20 min
Aug 3, 7:33 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 3, 10:25 PM CDT	Special Weather Statement	MPX	65 min
Aug 3, 10:33 PM CDT	Mesoscale Discussion	SPC	87 min
Aug 3, 10:39 PM CDT	Severe Thunderstorm Warning	MPX	36 min
Aug 3, 10:54 PM CDT	Severe Thunderstorm Warning	MPX	25 min
Aug 3, 11:06 PM CDT	Severe Thunderstorm Warning	MPX	39 min
Aug 15, 2:56 PM CDT	Mesoscale Discussion	SPC	64 min
Aug 15, 3:25 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 15, 5:49 PM CDT	Mesoscale Discussion	SPC	86 min
Aug 15, 8:20 PM CDT	Mesoscale Discussion	SPC	85 min
Aug 22, 1:06 PM CDT	Special Weather Statement	MPX	54 min
Aug 22, 2:01 PM CDT	Special Weather Statement	MPX	59 min
Aug 22, 3:11 PM CDT	Special Weather Statement	MPX	79 min
Aug 23, 8:37 PM CDT	Severe Thunderstorm Warning	MPX	38 min
Aug 23, 8:47 PM CDT	Areal Flood Advisory	MPX	3 hr
Aug 23, 9:00 PM CDT	Special Weather Statement	MPX	90 min
Aug 23, 9:02 PM CDT	Severe Thunderstorm Warning	MPX	23 min
Aug 23, 9:32 PM CDT	Areal Flood Advisory	MPX	3 hr
Aug 27, 4:22 PM CDT	Excessive Heat Watch	MPX	42 hr
Aug 28, 3:46 PM CDT	Fire Weather Watch	MPX	24 hr
Sep 9, 12:05 PM CDT	Red Flag Warning	MPX	57 hr
Sep 21, 3:03 PM CDT	Freeze Watch	MPX	12 hr
Sep 22, 3:14 AM CDT	Freeze Warning	MPX	29 hr
Oct 3, 2:31 PM CDT	Wind Advisory	MPX	28 hr
Oct 8, 3:34 AM CDT	Red Flag Warning	MPX	15 hr
Oct 23, 4:32 AM CDT	Special Weather Statement	MPX	28 min
Oct 23, 3:24 PM CDT	Dense Fog Advisory	MPX	15 hr
Nov 21, 3:19 PM CST	Wind Advisory	MPX	39 hr
Dec 1, 3:03 PM CST	Freezing Fog Advisory	MPX	21 hr
Dec 7, 4:18 AM CST	Winter Storm Watch	MPX	23 hr
Dec 7, 3:49 PM CST	Winter Storm Warning	MPX	56 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	32
Severe Thunderstorm Watch	10
Tornado Watch	2
Mesoscale Discussion	32
Special Weather Statement	19
Flooding
Flash Flood Warning	2
River Flood Warning	3
Flash Flood Watch	3
River Flood Watch	4
Areal Flood Advisory	10
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Freezing Rain Advisory	1
Winter Weather Advisory	4
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	3
Cold
Freeze Warning	4
Freeze Watch	2
Wind and dust
Wind Advisory	4
Fire
Red Flag Warning	3
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	4
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 2011 2013

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.