Alert archive / Michigan / Calhoun County

Weather alerts in Calhoun County, Michigan, 2010

190 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Calhoun County and its neighbors

Each county as a circle sized by its count in 2010. Tap one for its archive.

Alerts: 190
Warnings: 50
Watches: 33
Advisories: 45
Busiest month: July56 alerts
Busiest day: July 23, 201017 alerts

Over time

By month

Warning verification

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

2 of 11 tornado warnings covering Calhoun County in 2010 had a tornado report inside them; 2 of 4 tornado reports fell inside a warning, on average 21 minutes after it went out.

Calhoun County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	11	2	82%	4	50%	21 min
Severe thunderstorm warnings	23	15	35%	19	74%	33 min
Flash flood warnings	3	3	0%	3	100%	84 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Grand Rapids, MI: tornado warnings	31	4	87%	8	50%	20 min
NWS Grand Rapids, MI: severe thunderstorm warnings	91	47	48%	186	70%	26 min
NWS Grand Rapids, MI: flash flood warnings	8	5	38%	18	78%	61 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 5, 8:14 PM EST	Freezing Rain Advisory	GRR	7 hr
Jan 6, 3:41 PM EST	Winter Weather Advisory	GRR	36 hr
Feb 7, 3:37 PM EST	Winter Storm Watch	GRR	24 hr
Feb 8, 4:05 PM EST	Winter Storm Warning	GRR	42 hr
Feb 17, 3:12 AM EST	Winter Weather Advisory	GRR	8 hr
Feb 20, 3:21 PM EST	Winter Storm Watch	GRR	24 hr
Feb 21, 3:50 PM EST	Winter Storm Warning	GRR	21 hr
Feb 24, 9:01 AM EST	Lake Effect Snow Advisory	GRR	14 hr
Feb 26, 2:50 PM EST	Winter Weather Advisory	GRR	14 hr
Mar 11, 11:14 AM EST	River Flood Advisory	GRR	10 days
Mar 11, 2:47 PM EST	Areal Flood Advisory	GRR	44 hr
Mar 31, 3:37 PM EDT	Fire Weather Watch	GRR	36 hr
Apr 2, 3:38 AM EDT	Red Flag Warning	GRR	16 hr
Apr 3, 1:11 PM EDT	Special Weather Statement	GRR	94 min
Apr 4, 8:50 PM EDT	Special Weather Statement	GRR	55 min
Apr 5, 11:29 PM EDT	Severe Thunderstorm Warning	GRR	46 min
Apr 6, 12:07 AM EDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 6, 12:09 AM EDT	Severe Thunderstorm Warning	GRR	51 min
Apr 6, 12:48 AM EDT	Severe Thunderstorm Warning	GRR	42 min
Apr 6, 3:42 AM EDT	Special Weather Statement	GRR	78 min
Apr 6, 8:37 AM EDT	Mesoscale Discussion	SPC	83 min
Apr 6, 9:26 AM EDT	Severe Thunderstorm Watch	SPC	4 hr
Apr 6, 10:27 AM EDT	Severe Thunderstorm Warning	GRR	48 min
Apr 6, 11:27 AM EDT	Mesoscale Discussion	SPC	63 min
Apr 15, 4:47 AM EDT	Red Flag Warning	GRR	15 hr
Apr 16, 3:35 PM EDT	Freeze Watch	GRR	24 hr
Apr 17, 3:15 PM EDT	Freeze Warning	GRR	19 hr
Apr 18, 2:09 PM EDT	Freeze Warning	GRR	18 hr
Apr 19, 1:51 PM EDT	Frost Advisory	GRR	18 hr
Apr 21, 3:41 PM EDT	Frost Advisory	GRR	17 hr
Apr 22, 3:11 PM EDT	Frost Advisory	GRR	18 hr
Apr 25, 10:14 AM EDT	Special Weather Statement	GRR	31 min
Apr 26, 10:10 AM EDT	River Flood Advisory	GRR	11 hr
Apr 27, 3:18 AM EDT	Freeze Watch	GRR	11 hr
Apr 27, 2:07 PM EDT	Freeze Warning	GRR	18 hr
Apr 28, 3:47 PM EDT	Frost Advisory	GRR	16 hr
May 1, 2:49 AM EDT	Special Weather Statement	GRR	71 min
May 1, 3:30 AM EDT	Special Weather Statement	GRR	60 min
May 7, 2:59 PM EDT	Mesoscale Discussion	SPC	91 min
May 7, 3:35 PM EDT	Special Weather Statement	GRR	85 min
May 7, 5:00 PM EDT	Special Weather Statement	GRR	105 min
May 8, 3:36 PM EDT	Freeze Warning	GRR	16 hr
May 9, 10:53 AM EDT	Freeze Warning	GRR	21 hr
May 11, 11:47 AM EDT	River Flood Advisory	GRR	12 days
May 12, 3:58 PM EDT	Flood Watch	GRR	28 hr
May 12, 4:35 PM EDT	River Flood Advisory	GRR	48 hr
May 13, 2:25 PM EDT	Areal Flood Advisory	GRR	24 hr
May 21, 4:23 PM EDT	Special Weather Statement	GRR	52 min
May 22, 11:13 AM EDT	River Flood Advisory	GRR	22 hr
May 23, 3:50 AM EDT	Dense Fog Advisory	GRR	4 hr
May 23, 10:53 PM EDT	River Flood Advisory	GRR	21 days
May 31, 10:40 AM EDT	Special Weather Statement	GRR	80 min
Jun 4, 5:54 PM EDT	Mesoscale Discussion	SPC	66 min
Jun 4, 6:29 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 5, 4:10 AM EDT	Flood Watch	GRR	24 hr
Jun 5, 9:55 PM EDT	Areal Flood Advisory	GRR	12 hr
Jun 5, 10:21 PM EDT	River Flood Advisory	GRR	4 days
Jun 5, 10:21 PM EDT	Special Weather Statement	GRR	54 min
Jun 5, 10:29 PM EDT	Mesoscale Discussion	SPC	61 min
Jun 5, 10:45 PM EDT	Tornado Warning	GRR	30 min
Jun 5, 11:12 PM EDT	Tornado Watch	SPC	2 hr
Jun 5, 11:16 PM EDT	Tornado Warning	GRR	8 min
Jun 5, 11:17 PM EDT	Tornado Warning	GRR	43 min
Jun 5, 11:27 PM EDT	Tornado Warning	GRR	48 min
Jun 5, 11:54 PM EDT	Tornado Warning	GRR	51 min
Jun 6, 12:11 AM EDT	Flash Flood Warning	GRR	6 hr
Jun 6, 12:11 AM EDT	Tornado Warning	GRR	37 min
Jun 6, 12:17 AM EDT	Mesoscale Discussion	SPC	118 min
Jun 6, 12:48 AM EDT	Severe Thunderstorm Warning	GRR	42 min
Jun 11, 11:46 AM EDT	Special Weather Statement	GRR	44 min
Jun 16, 12:14 AM EDT	Areal Flood Advisory	GRR	8 hr
Jun 18, 3:47 PM EDT	Mesoscale Discussion	SPC	58 min
Jun 18, 4:32 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 18, 5:51 PM EDT	Flash Flood Watch	GRR	10 hr
Jun 18, 6:06 PM EDT	Mesoscale Discussion	SPC	54 min
Jun 18, 7:33 PM EDT	Severe Thunderstorm Warning	GRR	57 min
Jun 18, 7:56 PM EDT	Mesoscale Discussion	SPC	94 min
Jun 18, 8:12 PM EDT	Severe Thunderstorm Warning	GRR	63 min
Jun 21, 11:44 PM EDT	Mesoscale Discussion	SPC	61 min
Jun 22, 12:09 AM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 22, 1:32 AM EDT	Areal Flood Advisory	GRR	9 hr
Jun 22, 1:48 AM EDT	Special Weather Statement	GRR	57 min
Jun 22, 2:23 AM EDT	Severe Thunderstorm Warning	GRR	67 min
Jun 22, 2:27 AM EDT	Areal Flood Advisory	GRR	8 hr
Jun 23, 7:26 AM EDT	Mesoscale Discussion	SPC	64 min
Jun 23, 7:30 AM EDT	Flash Flood Watch	GRR	16 hr
Jun 23, 7:40 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 23, 8:50 AM EDT	Special Weather Statement	GRR	55 min
Jun 23, 9:29 AM EDT	Special Weather Statement	GRR	61 min
Jun 23, 9:31 AM EDT	Mesoscale Discussion	SPC	59 min
Jun 23, 11:52 AM EDT	Mesoscale Discussion	SPC	53 min
Jun 23, 6:56 PM EDT	Mesoscale Discussion	SPC	94 min
Jun 23, 7:16 PM EDT	Tornado Watch	SPC	5 hr
Jun 23, 8:21 PM EDT	Severe Thunderstorm Warning	GRR	54 min
Jun 23, 9:17 PM EDT	Severe Thunderstorm Warning	GRR	58 min
Jun 23, 9:18 PM EDT	River Flood Advisory	GRR	21 hr
Jun 24, 10:48 AM EDT	River Flood Advisory	GRR	5 days
Jun 27, 11:02 AM EDT	Mesoscale Discussion	SPC	118 min
Jun 27, 11:38 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 27, 2:43 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 7, 11:27 AM EDT	Heat Advisory	GRR	8 hr
Jul 10, 4:40 PM EDT	Special Weather Statement	GRR	65 min
Jul 10, 7:05 PM EDT	Special Weather Statement	GRR	55 min
Jul 15, 4:52 AM EDT	Mesoscale Discussion	SPC	83 min
Jul 15, 1:01 PM EDT	Mesoscale Discussion	SPC	59 min
Jul 15, 1:30 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 15, 3:49 PM EDT	Severe Thunderstorm Warning	GRR	41 min
Jul 15, 4:08 PM EDT	Severe Thunderstorm Warning	GRR	52 min
Jul 15, 4:29 PM EDT	Severe Thunderstorm Warning	GRR	46 min
Jul 15, 4:34 PM EDT	Areal Flood Advisory	GRR	6 hr
Jul 15, 5:00 PM EDT	Flash Flood Warning	GRR	6 hr
Jul 15, 5:16 PM EDT	Severe Thunderstorm Warning	GRR	44 min
Jul 18, 12:52 PM EDT	Mesoscale Discussion	SPC	113 min
Jul 18, 1:47 PM EDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 18, 4:48 PM EDT	Mesoscale Discussion	SPC	87 min
Jul 22, 2:30 PM EDT	Mesoscale Discussion	SPC	90 min
Jul 22, 4:03 PM EDT	Severe Thunderstorm Warning	GRR	42 min
Jul 22, 4:23 PM EDT	Severe Thunderstorm Warning	GRR	52 min
Jul 22, 4:25 PM EDT	Tornado Warning	GRR	35 min
Jul 22, 4:41 PM EDT	Tornado Warning	GRR	49 min
Jul 22, 4:50 PM EDT	Mesoscale Discussion	SPC	55 min
Jul 22, 4:53 PM EDT	Tornado Watch	SPC	3 hr
Jul 22, 5:12 PM EDT	Areal Flood Advisory	GRR	8 hr
Jul 22, 5:14 PM EDT	Severe Thunderstorm Warning	GRR	46 min
Jul 22, 5:42 PM EDT	Tornado Warning	GRR	29 min
Jul 22, 7:33 PM EDT	Tornado Watch	SPC	5 hr
Jul 22, 10:57 PM EDT	Areal Flood Advisory	GRR	16 hr
Jul 22, 10:57 PM EDT	Severe Thunderstorm Warning	GRR	48 min
Jul 22, 11:37 PM EDT	Severe Thunderstorm Warning	GRR	38 min
Jul 23, 12:00 AM EDT	Mesoscale Discussion	SPC	90 min
Jul 23, 12:09 AM EDT	Tornado Warning	GRR	51 min
Jul 23, 12:35 AM EDT	Tornado Watch	SPC	3 hr
Jul 23, 1:12 AM EDT	Special Weather Statement	GRR	78 min
Jul 23, 4:42 AM EDT	Heat Advisory	GRR	15 hr
Jul 23, 12:38 PM EDT	Flash Flood Watch	GRR	10 hr
Jul 23, 4:58 PM EDT	Mesoscale Discussion	SPC	92 min
Jul 23, 5:01 PM EDT	Severe Thunderstorm Warning	GRR	44 min
Jul 23, 5:09 PM EDT	Areal Flood Advisory	GRR	3 hr
Jul 23, 5:23 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 23, 5:37 PM EDT	Flash Flood Warning	GRR	5 hr
Jul 23, 6:33 PM EDT	Special Weather Statement	GRR	27 min
Jul 23, 7:05 PM EDT	Special Weather Statement	GRR	85 min
Jul 23, 7:31 PM EDT	Special Weather Statement	GRR	44 min
Jul 23, 10:31 PM EDT	Flash Flood Watch	GRR	17 hr
Jul 23, 11:13 PM EDT	River Flood Advisory	GRR	6 days
Jul 23, 11:13 PM EDT	River Flood Advisory	GRR	10 days
Jul 24, 9:37 AM EDT	Areal Flood Advisory	GRR	4 hr
Jul 24, 9:38 AM EDT	Special Weather Statement	GRR	82 min
Jul 25, 3:11 AM EDT	Special Weather Statement	GRR	49 min
Jul 25, 8:48 AM EDT	Areal Flood Advisory	GRR	6 hr
Jul 25, 2:47 PM EDT	Areal Flood Advisory	GRR	18 hr
Jul 28, 12:44 PM EDT	Mesoscale Discussion	SPC	91 min
Jul 28, 1:20 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 28, 1:24 PM EDT	Special Weather Statement	GRR	66 min
Jul 28, 1:28 PM EDT	Areal Flood Advisory	GRR	2 hr
Jul 28, 1:54 PM EDT	Severe Thunderstorm Warning	GRR	51 min
Aug 4, 10:41 AM EDT	Special Weather Statement	GRR	49 min
Aug 9, 8:01 AM EDT	Special Weather Statement	GRR	59 min
Aug 10, 3:26 AM EDT	Dense Fog Advisory	GRR	6 hr
Aug 11, 10:29 AM EDT	Special Weather Statement	GRR	61 min
Aug 15, 1:04 PM EDT	Mesoscale Discussion	SPC	116 min
Sep 6, 3:43 PM EDT	Wind Advisory	GRR	36 hr
Sep 16, 1:04 PM EDT	Special Weather Statement	GRR	56 min
Sep 21, 7:05 PM EDT	Mesoscale Discussion	SPC	55 min
Sep 21, 8:08 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Sep 21, 9:03 PM EDT	Severe Thunderstorm Warning	GRR	72 min
Sep 21, 9:40 PM EDT	Severe Thunderstorm Warning	GRR	65 min
Sep 23, 4:14 PM EDT	Wind Advisory	GRR	28 hr
Oct 3, 3:07 PM EDT	Frost Advisory	GRR	18 hr
Oct 4, 3:20 PM EDT	Frost Advisory	GRR	18 hr
Oct 8, 3:37 AM EDT	Red Flag Warning	GRR	16 hr
Oct 15, 3:47 PM EDT	Frost Advisory	GRR	17 hr
Oct 18, 4:02 PM EDT	Frost Advisory	GRR	17 hr
Oct 20, 10:52 PM EDT	Special Weather Statement	GRR	53 min
Oct 21, 2:59 PM EDT	Freeze Warning	GRR	18 hr
Oct 24, 4:12 PM EDT	High Wind Watch	GRR	23 hr
Oct 24, 7:50 PM EDT	Special Weather Statement	GRR	55 min
Oct 24, 7:51 PM EDT	Special Weather Statement	GRR	54 min
Oct 25, 3:37 PM EDT	High Wind Warning	GRR	58 hr
Oct 26, 4:28 AM EDT	Tornado Watch	SPC	8 hr
Oct 26, 7:00 AM EDT	Mesoscale Discussion	SPC	2 hr
Oct 26, 10:46 AM EDT	Mesoscale Discussion	SPC	59 min
Oct 26, 11:04 AM EDT	Tornado Watch	SPC	4 hr
Oct 26, 11:09 AM EDT	Tornado Warning	GRR	41 min
Oct 27, 7:38 PM EDT	Wind Advisory	GRR	6 hr
Nov 17, 12:48 PM EST	Special Weather Statement	GRR	57 min
Nov 22, 4:49 PM EST	Mesoscale Discussion	SPC	86 min
Nov 22, 6:13 PM EST	Tornado Watch	SPC	4 hr
Dec 10, 4:20 PM EST	Winter Storm Watch	GRR	24 hr
Dec 11, 4:04 PM EST	Winter Storm Warning	GRR	50 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	23
Tornado Warning	11
Severe Thunderstorm Watch	12
Tornado Watch	8
Mesoscale Discussion	30
Special Weather Statement	32
Flooding
Flash Flood Warning	3
Flash Flood Watch	4
Flood Watch	2
Areal Flood Advisory	14
River Flood Advisory	11
Winter
Winter Storm Warning	3
Winter Storm Watch	3
Freezing Rain Advisory	1
Lake Effect Snow Advisory	1
Winter Weather Advisory	3
Heat
Heat Advisory	2
Cold
Freeze Warning	6
Freeze Watch	2
Frost Advisory	8
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	3
Fire
Red Flag Warning	3
Fire Weather Watch	1
Fog and smoke
Dense 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 2009 2011

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.