Alert archive / Illinois / LaSalle County

Weather alerts in LaSalle County, Illinois, 2014

172 weather alerts in 2014, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

LaSalle County and its neighbors

Each county as a circle sized by its count in 2014. Tap one for its archive.

Alerts: 172
Warnings: 39
Watches: 25
Advisories: 62
Busiest month: June33 alerts
Busiest day: June 30, 201411 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 1 tornado reports fell inside a warning.

LaSalle County, 2014

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			1	0%
Severe thunderstorm warnings	11	7	36%	11	64%	15 min
Flash flood warnings	2	0	100%	0

Each office's whole area, 2014

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Chicago, IL: tornado warnings	9	2	78%	17	41%	8 min
NWS Chicago, IL: severe thunderstorm warnings	130	77	41%	403	85%	31 min
NWS Chicago, IL: flash flood warnings	29	13	55%	42	67%	73 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, 4:33 AM CST	Wind Chill Advisory	LOT	29 hr
Jan 4, 3:57 AM CST	Winter Storm Warning	LOT	44 hr
Jan 4, 3:57 AM CST	Winter Weather Advisory	LOT	7 hr
Jan 4, 2:07 PM CST	Wind Chill Warning	LOT	70 hr
Jan 10, 4:08 AM CST	Freezing Fog Advisory	LOT	7 hr
Jan 10, 6:16 PM CST	Freezing Rain Advisory	LOT	6 hr
Jan 17, 3:21 PM CST	Winter Weather Advisory	LOT	29 hr
Jan 20, 3:58 AM CST	Wind Chill Advisory	LOT	30 hr
Jan 22, 3:47 AM CST	Wind Chill Advisory	LOT	32 hr
Jan 22, 4:02 PM CST	Winter Weather Advisory	LOT	12 hr
Jan 23, 4:12 AM CST	Wind Chill Advisory	LOT	30 hr
Jan 23, 3:37 PM CST	Winter Weather Advisory	LOT	41 hr
Jan 25, 4:07 AM CST	Wind Chill Watch	LOT	12 hr
Jan 25, 3:41 PM CST	Wind Chill Warning	LOT	68 hr
Jan 25, 3:41 PM CST	Winter Weather Advisory	LOT	28 hr
Jan 26, 3:17 PM CST	Winter Storm Warning	LOT	15 hr
Jan 30, 2:36 PM CST	Winter Storm Watch	LOT	24 hr
Jan 31, 10:42 AM CST	Winter Storm Warning	LOT	31 hr
Feb 4, 3:08 AM CST	Winter Weather Advisory	LOT	35 hr
Feb 5, 2:36 PM CST	Wind Chill Advisory	LOT	19 hr
Feb 6, 3:53 AM CST	Wind Chill Advisory	LOT	31 hr
Feb 8, 9:16 AM CST	Special Weather Statement	LOT	119 min
Feb 8, 11:20 AM CST	Special Weather Statement	LOT	115 min
Feb 9, 3:04 AM CST	Wind Chill Advisory	LOT	32 hr
Feb 14, 9:12 AM CST	Special Weather Statement	LOT	2 hr
Feb 16, 4:02 AM CST	Winter Weather Advisory	LOT	21 hr
Feb 17, 12:32 AM CST	Winter Storm Warning	LOT	20 hr
Feb 17, 11:30 AM CST	Mesoscale Discussion	SPC	5 hr
Feb 19, 3:21 AM CST	Flood Watch	LOT	36 hr
Feb 19, 9:27 PM CST	High Wind Watch	LOT	6 hr
Feb 20, 3:33 AM CST	High Wind Warning	LOT	19 hr
Feb 20, 6:19 AM CST	Areal Flood Advisory	LOT	6 hr
Feb 20, 10:11 AM CST	Special Weather Statement	LOT	34 min
Feb 20, 11:28 AM CST	River Flood Watch	LOT	3 days
Feb 20, 11:28 AM CST	River Flood Watch	LOT	6 days
Feb 20, 1:53 PM CST	Dense Fog Advisory	LOT	5 hr
Feb 20, 10:59 PM CST	Wind Advisory	LOT	16 hr
Feb 21, 12:01 PM CST	River Flood Warning	LOT	42 hr
Feb 21, 12:01 PM CST	River Flood Warning	LOT	5 days
Feb 21, 3:57 PM CST	River Flood Advisory	LOT	36 hr
Feb 21, 7:49 PM CST	River Flood Warning	LOT	34 hr
Feb 22, 11:15 AM CST	River Flood Advisory	LOT	3 days
Feb 25, 3:11 AM CST	Wind Chill Advisory	LOT	31 hr
Feb 26, 10:21 AM CST	Wind Chill Advisory	LOT	25 hr
Feb 27, 11:19 AM CST	River Flood Warning	LOT	71 hr
Mar 1, 2:59 AM CST	Winter Weather Advisory	LOT	36 hr
Mar 2, 2:37 PM CST	Wind Chill Advisory	LOT	18 hr
Mar 5, 1:51 AM CST	Winter Weather Advisory	LOT	10 hr
Mar 10, 9:42 PM CDT	River Flood Warning	LOT	13 days
Mar 11, 3:51 AM CDT	Winter Storm Warning	LOT	31 hr
Mar 11, 3:51 AM CDT	Winter Weather Advisory	LOT	31 hr
Mar 11, 7:15 AM CDT	River Flood Advisory	LOT	5 days
Mar 11, 11:52 PM CDT	Mesoscale Discussion	SPC	6 hr
Mar 15, 12:58 AM CDT	River Flood Advisory	LOT	33 hr
Mar 15, 2:08 PM CDT	River Flood Warning	LOT	35 hr
Mar 19, 11:13 AM CDT	River Flood Advisory	LOT	3 days
Apr 3, 2:49 AM CDT	Mesoscale Discussion	SPC	116 min
Apr 3, 9:20 AM CDT	Areal Flood Advisory	LOT	4 hr
Apr 3, 10:33 AM CDT	River Flood Warning	LOT	65 hr
Apr 3, 11:35 AM CDT	River Flood Warning	LOT	5 days
Apr 3, 11:36 AM CDT	River Flood Advisory	LOT	4 days
Apr 6, 11:35 AM CDT	River Flood Advisory	LOT	43 hr
Apr 13, 10:55 AM CDT	River Flood Watch	LOT	5 days
Apr 13, 12:36 PM CDT	River Flood Watch	LOT	24 hr
Apr 28, 5:57 PM CDT	Special Weather Statement	LOT	33 min
Apr 28, 6:31 PM CDT	Special Weather Statement	LOT	29 min
Apr 29, 5:49 AM CDT	Dense Fog Advisory	LOT	3 hr
May 8, 5:54 PM CDT	Mesoscale Discussion	SPC	2 hr
May 11, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 11, 4:50 PM CDT	Severe Thunderstorm Warning	LOT	55 min
May 11, 5:09 PM CDT	Mesoscale Discussion	SPC	66 min
May 11, 5:44 PM CDT	Severe Thunderstorm Warning	LOT	61 min
May 11, 6:20 PM CDT	Areal Flood Advisory	LOT	3 hr
May 12, 9:51 AM CDT	Mesoscale Discussion	SPC	84 min
May 12, 3:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 12, 5:53 PM CDT	Severe Thunderstorm Warning	LOT	67 min
May 12, 6:32 PM CDT	Severe Thunderstorm Warning	LOT	58 min
May 13, 1:14 PM CDT	River Flood Watch	LOT	4 days
May 14, 2:37 AM CDT	River Flood Advisory	LOT	63 hr
May 17, 10:59 AM CDT	River Flood Warning	LOT	47 hr
May 20, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 21, 1:27 AM CDT	Mesoscale Discussion	SPC	93 min
May 21, 4:12 AM CDT	Special Weather Statement	LOT	33 min
May 28, 2:29 PM CDT	Areal Flood Advisory	LOT	6 hr
Jun 1, 6:58 PM CDT	Special Weather Statement	LOT	62 min
Jun 2, 10:38 AM CDT	Special Weather Statement	LOT	37 min
Jun 16, 9:24 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 16, 11:40 PM CDT	Mesoscale Discussion	SPC	65 min
Jun 17, 1:29 AM CDT	Mesoscale Discussion	SPC	91 min
Jun 17, 3:41 AM CDT	Mesoscale Discussion	SPC	64 min
Jun 17, 4:11 AM CDT	Tornado Watch	SPC	3 hr
Jun 17, 1:58 PM CDT	Mesoscale Discussion	SPC	92 min
Jun 18, 10:47 PM CDT	Flash Flood Warning	LOT	6 hr
Jun 19, 4:24 AM CDT	Areal Flood Warning	LOT	6 hr
Jun 20, 9:01 PM CDT	River Flood Advisory	LOT	48 hr
Jun 20, 9:01 PM CDT	River Flood Advisory	LOT	58 hr
Jun 21, 12:41 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 21, 1:33 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 21, 3:41 PM CDT	Areal Flood Advisory	LOT	6 hr
Jun 21, 3:41 PM CDT	Mesoscale Discussion	SPC	64 min
Jun 21, 4:40 PM CDT	Severe Thunderstorm Warning	LOT	52 min
Jun 21, 6:16 PM CDT	Mesoscale Discussion	SPC	89 min
Jun 22, 12:01 PM CDT	River Flood Warning	LOT	5 days
Jun 22, 7:49 PM CDT	Special Weather Statement	LOT	56 min
Jun 22, 8:49 PM CDT	River Flood Warning	LOT	30 hr
Jun 25, 12:11 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 30, 1:16 AM CDT	Severe Thunderstorm Warning	LOT	44 min
Jun 30, 1:41 AM CDT	Mesoscale Discussion	SPC	64 min
Jun 30, 2:52 AM CDT	Special Weather Statement	LOT	23 min
Jun 30, 4:12 AM CDT	Flash Flood Watch	LOT	21 hr
Jun 30, 4:35 AM CDT	Areal Flood Advisory	LOT	4 hr
Jun 30, 11:27 AM CDT	River Flood Watch	LOT	4 days
Jun 30, 1:27 PM CDT	Mesoscale Discussion	SPC	93 min
Jun 30, 2:03 PM CDT	Tornado Watch	SPC	5 hr
Jun 30, 3:25 PM CDT	Mesoscale Discussion	SPC	35 min
Jun 30, 3:47 PM CDT	Special Weather Statement	LOT	43 min
Jun 30, 6:08 PM CDT	Mesoscale Discussion	SPC	67 min
Jun 30, 8:44 PM CDT	Mesoscale Discussion	SPC	31 min
Jun 30, 8:50 PM CDT	Severe Thunderstorm Warning	LOT	40 min
Jun 30, 9:01 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 30, 9:18 PM CDT	Severe Thunderstorm Warning	LOT	57 min
Jun 30, 9:26 PM CDT	River Flood Warning	LOT	66 hr
Jun 30, 9:27 PM CDT	Severe Thunderstorm Warning	LOT	78 min
Jun 30, 9:37 PM CDT	Areal Flood Advisory	LOT	4 hr
Jun 30, 9:47 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 30, 10:45 PM CDT	River Flood Warning	LOT	6 days
Jun 30, 10:52 PM CDT	River Flood Advisory	LOT	36 hr
Jul 1, 11:43 AM CDT	River Flood Warning	LOT	61 hr
Jul 12, 3:21 PM CDT	Flash Flood Watch	LOT	14 hr
Jul 12, 5:51 PM CDT	Mesoscale Discussion	SPC	84 min
Jul 12, 7:09 PM CDT	Mesoscale Discussion	SPC	96 min
Jul 12, 9:09 PM CDT	Mesoscale Discussion	SPC	66 min
Jul 12, 9:11 PM CDT	River Flood Warning	LOT	63 hr
Jul 12, 9:51 PM CDT	Tornado Watch	SPC	3 hr
Jul 12, 9:53 PM CDT	River Flood Warning	LOT	4 days
Jul 12, 9:53 PM CDT	Severe Thunderstorm Warning	LOT	52 min
Jul 12, 10:03 PM CDT	River Flood Advisory	LOT	4 days
Jul 12, 11:44 PM CDT	Mesoscale Discussion	SPC	31 min
Jul 13, 9:22 AM CDT	River Flood Advisory	LOT	36 hr
Aug 1, 6:17 AM CDT	Areal Flood Advisory	LOT	3 hr
Aug 18, 3:47 AM CDT	Dense Fog Advisory	LOT	5 hr
Aug 22, 12:25 AM CDT	Areal Flood Advisory	LOT	6 hr
Aug 22, 2:06 AM CDT	Areal Flood Advisory	LOT	6 hr
Aug 22, 5:10 AM CDT	Flash Flood Warning	LOT	6 hr
Aug 22, 7:51 AM CDT	Areal Flood Advisory	LOT	6 hr
Aug 22, 10:56 AM CDT	Areal Flood Warning	LOT	6 hr
Aug 23, 11:18 AM CDT	Mesoscale Discussion	SPC	117 min
Aug 24, 3:12 PM CDT	Heat Advisory	LOT	27 hr
Aug 25, 3:34 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 25, 3:42 PM CDT	Severe Thunderstorm Warning	LOT	48 min
Aug 25, 4:17 PM CDT	Special Weather Statement	LOT	28 min
Aug 25, 5:30 PM CDT	Mesoscale Discussion	SPC	60 min
Aug 25, 5:36 PM CDT	Areal Flood Advisory	LOT	4 hr
Aug 25, 7:45 PM CDT	Mesoscale Discussion	SPC	60 min
Aug 26, 9:34 AM CDT	Mesoscale Discussion	SPC	116 min
Sep 1, 3:59 AM CDT	Special Weather Statement	LOT	46 min
Sep 5, 2:02 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 9, 11:54 AM CDT	Flash Flood Watch	LOT	31 hr
Sep 10, 6:37 AM CDT	Special Weather Statement	LOT	53 min
Sep 10, 9:33 AM CDT	Areal Flood Advisory	LOT	5 hr
Sep 10, 9:34 PM CDT	River Flood Advisory	LOT	42 hr
Sep 20, 1:25 PM CDT	Mesoscale Discussion	SPC	95 min
Sep 20, 2:12 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Sep 20, 6:56 PM CDT	Mesoscale Discussion	SPC	2 hr
Oct 4, 3:05 PM CDT	Frost Advisory	LOT	17 hr
Oct 10, 3:46 PM CDT	Frost Advisory	LOT	16 hr
Oct 11, 7:18 PM CDT	Frost Advisory	LOT	13 hr
Oct 18, 3:32 AM CDT	Frost Advisory	LOT	30 hr
Nov 21, 2:45 AM CST	Freezing Rain Advisory	LOT	30 hr
Nov 30, 1:09 AM CST	Dense Fog Advisory	LOT	9 hr
Dec 14, 6:15 PM CST	Dense Fog Advisory	LOT	14 hr
Dec 23, 2:16 PM CST	Winter Weather Advisory	LOT	20 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	11
Severe Thunderstorm Watch	9
Tornado Watch	3
Mesoscale Discussion	31
Special Weather Statement	15
Flooding
Areal Flood Warning	2
Flash Flood Warning	2
River Flood Warning	16
Flash Flood Watch	3
Flood Watch	1
River Flood Watch	6
Areal Flood Advisory	13
River Flood Advisory	14
Winter
Winter Storm Warning	5
Winter Storm Watch	1
Freezing Rain Advisory	2
Winter Weather Advisory	11
Heat
Heat Advisory	1
Cold
Wind Chill Warning	2
Wind Chill Watch	1
Frost Advisory	4
Wind Chill Advisory	10
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	1
Fog and smoke
Dense Fog Advisory	5
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 2013 2015

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.