Weather alerts in Lake County, Illinois, 2010

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

Lake County and its neighbors

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

Alerts: 162
Warnings: 48
Watches: 31
Advisories: 52
Busiest month: June30 alerts
Busiest day: July 23, 201012 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 3 tornado warnings covering Lake County in 2010 had a tornado report inside them.

Lake County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	0	100%	0
Severe thunderstorm warnings	14	11	21%	15	80%	23 min
Flash flood warnings	3	2	33%	8	88%	109 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Chicago, IL: tornado warnings	32	10	69%	35	63%	26 min
NWS Chicago, IL: severe thunderstorm warnings	122	70	43%	394	72%	31 min
NWS Chicago, IL: flash flood warnings	31	14	55%	51	84%	102 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 5, 1:34 PM CST	Winter Storm Watch	LOT	23 hr
Jan 6, 12:51 PM CST	Winter Storm Warning	LOT	3 days
Jan 16, 8:16 PM CST	Freezing Fog Advisory	LOT	15 hr
Jan 17, 3:21 PM CST	Freezing Fog Advisory	LOT	21 hr
Jan 20, 4:00 AM CST	Freezing Rain Advisory	LOT	26 hr
Jan 23, 3:26 PM CST	Dense Fog Advisory	LOT	9 hr
Jan 23, 8:56 PM CST	River Flood Advisory	LOT	36 hr
Jan 24, 6:11 AM CST	River Flood Warning	MKX	3 days
Jan 26, 9:21 PM CST	River Flood Advisory	LOT	36 hr
Jan 27, 9:06 PM CST	River Flood Warning	MKX	61 hr
Jan 28, 10:29 AM CST	River Flood Advisory	LOT	10 hr
Feb 7, 1:17 PM CST	Winter Storm Watch	LOT	15 hr
Feb 8, 3:53 AM CST	Winter Storm Warning	LOT	53 hr
Feb 10, 4:14 AM CST	Winter Weather Advisory	LOT	10 hr
Feb 20, 3:47 AM CST	Winter Storm Watch	LOT	32 hr
Feb 21, 12:16 PM CST	Winter Storm Warning	LOT	20 hr
Feb 24, 4:25 AM CST	Lake Effect Snow Advisory	LOT	30 hr
Mar 7, 9:37 PM CST	Dense Fog Advisory	LOT	12 hr
Mar 8, 6:05 PM CST	Dense Fog Advisory	LOT	18 hr
Mar 9, 4:09 PM CST	River Flood Watch	MKX	64 days
Mar 10, 10:46 AM CST	River Flood Warning	MKX	11 days
Mar 10, 8:32 PM CST	River Flood Warning	LOT	8 days
Mar 10, 8:33 PM CST	Dense Fog Advisory	LOT	12 hr
Mar 12, 9:09 AM CST	River Flood Advisory	LOT	12 hr
Mar 12, 8:45 PM CST	River Flood Warning	LOT	6 days
Mar 12, 11:10 PM CST	Dense Fog Advisory	LOT	5 hr
Apr 5, 3:53 AM CDT	Dense Fog Advisory	LOT	4 hr
Apr 5, 9:37 PM CDT	Mesoscale Discussion	SPC	53 min
Apr 5, 10:06 PM CDT	Severe Thunderstorm Warning	LOT	54 min
Apr 5, 11:07 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 6, 12:36 AM CDT	Severe Thunderstorm Warning	LOT	54 min
Apr 6, 1:23 AM CDT	Severe Thunderstorm Warning	LOT	37 min
Apr 6, 4:44 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Apr 6, 6:29 AM CDT	Severe Thunderstorm Warning	LOT	61 min
Apr 6, 7:29 AM CDT	Severe Thunderstorm Warning	LOT	13 min
Apr 6, 7:37 AM CDT	Mesoscale Discussion	SPC	83 min
Apr 6, 10:40 AM CDT	River Flood Warning	MKX	6 days
Apr 6, 9:28 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 8, 9:11 PM CDT	River Flood Advisory	LOT	47 hr
Apr 17, 2:24 AM CDT	Frost Advisory	LOT	27 hr
Apr 27, 11:16 AM CDT	Frost Advisory	LOT	21 hr
Apr 29, 3:26 AM CDT	Wind Advisory	LOT	16 hr
Apr 30, 1:05 PM CDT	Tornado Watch	SPC	9 hr
Apr 30, 7:32 PM CDT	Mesoscale Discussion	SPC	58 min
May 5, 3:29 PM CDT	Red Flag Warning	LOT	6 hr
May 8, 4:10 AM CDT	Frost Advisory	LOT	28 hr
May 12, 9:52 AM CDT	River Flood Watch	MKX	24 hr
May 12, 3:13 PM CDT	Flood Watch	LOT	24 hr
May 13, 4:33 AM CDT	Areal Flood Advisory	LOT	5 hr
May 13, 6:07 AM CDT	Flash Flood Warning	LOT	6 hr
May 13, 6:13 AM CDT	River Flood Warning	LOT	6 days
May 13, 9:46 AM CDT	River Flood Warning	MKX	4 days
May 13, 10:31 AM CDT	River Flood Warning	LOT	5 days
May 13, 10:31 AM CDT	River Flood Warning	LOT	11 hr
May 13, 12:00 PM CDT	Areal Flood Warning	LOT	4 hr
May 13, 4:01 PM CDT	Areal Flood Warning	LOT	18 hr
May 14, 5:46 AM CDT	River Flood Warning	LOT	45 hr
May 21, 5:49 PM CDT	Areal Flood Advisory	LOT	3 hr
May 22, 1:06 AM CDT	Dense Fog Advisory	LOT	9 hr
Jun 1, 12:32 AM CDT	Dense Fog Advisory	LOT	8 hr
Jun 1, 3:46 PM CDT	Flash Flood Watch	LOT	23 hr
Jun 2, 5:42 AM CDT	Areal Flood Advisory	LOT	6 hr
Jun 2, 5:55 PM CDT	Mesoscale Discussion	SPC	65 min
Jun 4, 4:36 PM CDT	Flash Flood Watch	LOT	32 hr
Jun 4, 5:29 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 5, 9:44 PM CDT	Areal Flood Advisory	LOT	111 min
Jun 6, 5:49 PM CDT	Special Weather Statement	LOT	26 min
Jun 8, 3:06 AM CDT	Rip Current Statement	LOT	22 hr
Jun 18, 2:33 AM CDT	Mesoscale Discussion	SPC	27 min
Jun 18, 12:29 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 18, 3:18 PM CDT	Severe Thunderstorm Warning	LOT	72 min
Jun 18, 4:16 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 18, 5:06 PM CDT	Mesoscale Discussion	SPC	54 min
Jun 18, 5:47 PM CDT	Flash Flood Watch	LOT	9 hr
Jun 18, 8:47 PM CDT	Flash Flood Warning	LOT	3 hr
Jun 18, 9:01 PM CDT	Severe Thunderstorm Warning	LOT	59 min
Jun 18, 10:49 PM CDT	Areal Flood Advisory	LOT	110 min
Jun 21, 10:22 PM CDT	Tornado Warning	LOT	38 min
Jun 21, 10:52 PM CDT	Severe Thunderstorm Warning	LOT	24 min
Jun 21, 10:58 PM CDT	Severe Thunderstorm Warning	LOT	47 min
Jun 22, 12:27 PM CDT	River Flood Warning	MKX	9 days
Jun 22, 9:01 PM CDT	Flash Flood Watch	LOT	25 hr
Jun 23, 3:38 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 23, 8:42 AM CDT	Areal Flood Advisory	LOT	5 hr
Jun 23, 2:10 PM CDT	Tornado Watch	SPC	7 hr
Jun 26, 1:52 AM CDT	Mesoscale Discussion	SPC	83 min
Jun 26, 1:55 AM CDT	Special Weather Statement	LOT	60 min
Jun 27, 5:58 AM CDT	Mesoscale Discussion	SPC	92 min
Jun 27, 8:52 AM CDT	Areal Flood Advisory	LOT	3 hr
Jul 6, 7:13 PM CDT	Special Weather Statement	LOT	62 min
Jul 12, 1:25 AM CDT	Dense Fog Advisory	LOT	6 hr
Jul 14, 4:06 AM CDT	Dense Fog Advisory	LOT	4 hr
Jul 22, 8:12 PM CDT	River Flood Watch	MKX	11 hr
Jul 22, 8:40 PM CDT	River Flood Warning	MKX	16 days
Jul 22, 8:53 PM CDT	Tornado Watch	SPC	5 hr
Jul 22, 10:21 PM CDT	Tornado Warning	LOT	39 min
Jul 22, 10:56 PM CDT	Tornado Warning	LOT	34 min
Jul 22, 11:00 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 22, 11:10 PM CDT	Areal Flood Advisory	LOT	8 hr
Jul 23, 4:35 AM CDT	Flash Flood Watch	LOT	31 hr
Jul 23, 10:00 AM CDT	River Flood Advisory	LOT	12 hr
Jul 23, 2:30 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 23, 3:01 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 23, 6:44 PM CDT	Special Weather Statement	LOT	61 min
Jul 23, 10:11 PM CDT	River Flood Watch	LOT	14 hr
Jul 23, 10:11 PM CDT	River Flood Watch	LOT	14 hr
Jul 23, 10:15 PM CDT	River Flood Warning	LOT	61 hr
Jul 23, 10:35 PM CDT	Special Weather Statement	LOT	55 min
Jul 23, 11:31 PM CDT	Areal Flood Advisory	LOT	8 hr
Jul 23, 11:31 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 24, 12:04 AM CDT	Flash Flood Warning	LOT	7 hr
Jul 24, 7:09 AM CDT	Areal Flood Warning	LOT	33 hr
Jul 24, 7:44 AM CDT	River Flood Warning	LOT	14 hr
Jul 24, 7:44 AM CDT	River Flood Warning	LOT	38 hr
Jul 28, 1:25 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 31, 2:22 AM CDT	Areal Flood Advisory	LOT	3 hr
Jul 31, 10:49 PM CDT	Dense Fog Advisory	LOT	12 hr
Aug 11, 3:37 PM CDT	Heat Advisory	LOT	51 hr
Aug 13, 2:14 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 13, 5:27 PM CDT	Mesoscale Discussion	SPC	63 min
Aug 13, 7:32 PM CDT	Special Weather Statement	LOT	43 min
Aug 13, 8:01 PM CDT	Special Weather Statement	LOT	44 min
Aug 20, 1:58 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 20, 5:20 PM CDT	Mesoscale Discussion	SPC	85 min
Sep 2, 3:34 PM CDT	Rip Current Statement	LOT	51 hr
Sep 2, 8:56 PM CDT	Special Weather Statement	LOT	64 min
Sep 5, 3:17 PM CDT	Rip Current Statement	LOT	6 hr
Sep 5, 11:31 PM CDT	Special Weather Statement	LOT	44 min
Sep 6, 3:56 PM CDT	Wind Advisory	LOT	27 hr
Sep 15, 10:02 AM CDT	Rip Current Statement	LOT	45 hr
Sep 21, 1:31 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 21, 3:40 PM CDT	Mesoscale Discussion	SPC	95 min
Sep 21, 5:28 PM CDT	Severe Thunderstorm Warning	LOT	47 min
Sep 21, 6:15 PM CDT	Severe Thunderstorm Warning	LOT	20 min
Oct 3, 1:36 PM CDT	Frost Advisory	LOT	17 hr
Oct 4, 3:30 PM CDT	Frost Advisory	LOT	16 hr
Oct 20, 1:33 PM CDT	Red Flag Warning	LOT	5 hr
Oct 21, 3:43 PM CDT	Frost Advisory	LOT	16 hr
Oct 24, 3:39 PM CDT	High Wind Watch	LOT	24 hr
Oct 25, 4:38 AM CDT	High Wind Warning	LOT	39 hr
Oct 26, 2:21 AM CDT	Mesoscale Discussion	SPC	114 min
Oct 26, 3:28 AM CDT	Tornado Watch	SPC	8 hr
Oct 26, 6:00 AM CDT	Mesoscale Discussion	SPC	2 hr
Oct 26, 7:29 AM CDT	Severe Thunderstorm Warning	LOT	12 min
Oct 26, 7:47 AM CDT	Severe Thunderstorm Warning	LOT	10 min
Oct 26, 7:13 PM CDT	Wind Advisory	LOT	24 hr
Oct 27, 4:08 AM CDT	High Wind Warning	LOT	15 hr
Nov 22, 11:23 AM CST	Tornado Watch	SPC	7 hr
Nov 22, 4:12 PM CST	Severe Thunderstorm Warning	LOT	48 min
Nov 24, 11:35 AM CST	Mesoscale Discussion	SPC	5 hr
Nov 25, 12:07 AM CST	Dense Fog Advisory	LOT	9 hr
Dec 3, 2:28 AM CST	Winter Weather Advisory	LOT	50 hr
Dec 10, 3:58 PM CST	Winter Storm Watch	LOT	23 hr
Dec 10, 10:08 PM CST	Dense Fog Advisory	LOT	7 hr
Dec 11, 1:07 PM CST	Winter Storm Warning	LOT	26 hr
Dec 12, 2:48 PM CST	Winter Weather Advisory	LOT	9 hr
Dec 19, 3:50 PM CST	Winter Weather Advisory	LOT	42 hr
Dec 21, 2:43 PM CST	Dense Fog Advisory	LOT	8 hr
Dec 21, 10:49 PM CST	Freezing Fog Advisory	LOT	4 hr
Dec 25, 2:36 AM CST	Lake Effect Snow Advisory	LOT	33 hr
Dec 25, 10:52 PM CST	Lake Effect Snow Warning	LOT	13 hr
Dec 30, 6:46 AM CST	Dense Fog Advisory	LOT	36 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	14
Tornado Warning	3
Severe Thunderstorm Watch	10
Tornado Watch	5
Mesoscale Discussion	18
Special Weather Statement	9
Flooding
Areal Flood Warning	3
Flash Flood Warning	3
River Flood Warning	16
Flash Flood Watch	5
Flood Watch	1
River Flood Watch	5
Areal Flood Advisory	11
River Flood Advisory	6
Winter
Lake Effect Snow Warning	1
Winter Storm Warning	4
Winter Storm Watch	4
Freezing Rain Advisory	1
Lake Effect Snow Advisory	2
Winter Weather Advisory	4
Heat
Heat Advisory	1
Cold
Frost Advisory	6
Wind and dust
High Wind Warning	2
High Wind Watch	1
Wind Advisory	3
Fire
Red Flag Warning	2
Fog and smoke
Dense Fog Advisory	15
Freezing Fog Advisory	3
Coast and beach
Rip Current Statement	4

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.