Alert archive / Illinois / Winnebago County

Weather alerts in Winnebago County, Illinois, 2015

127 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Winnebago County and its neighbors

Each county as a circle sized by its count in 2015. Tap one for its archive.

Alerts: 127
Warnings: 34
Watches: 24
Advisories: 42
Busiest month: April20 alerts
Busiest day: April 9, 20159 alerts

Over time

By month

Warning verification

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

3 of 4 tornado warnings covering Winnebago County in 2015 had a tornado report inside them; 3 of 3 tornado reports fell inside a warning, on average 31 minutes after it went out.

Winnebago County, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	3	25%	3	100%	31 min
Severe thunderstorm warnings	15	7	53%	8	63%	21 min
Flash flood warnings	3	1	67%	2	50%	57 min

Each office's whole area, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Chicago, IL: tornado warnings	36	22	39%	69	83%	15 min
NWS Chicago, IL: severe thunderstorm warnings	147	73	50%	252	71%	20 min
NWS Chicago, IL: flash flood warnings	46	20	57%	44	84%	87 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, 3:33 PM CST	Winter Weather Advisory	LOT	23 hr
Jan 4, 3:29 AM CST	Wind Chill Advisory	LOT	33 hr
Jan 4, 3:29 AM CST	Winter Storm Watch	LOT	23 hr
Jan 5, 2:49 AM CST	Winter Weather Advisory	LOT	25 hr
Jan 6, 3:43 AM CST	Wind Chill Warning	LOT	31 hr
Jan 7, 10:52 AM CST	Wind Chill Advisory	LOT	25 hr
Jan 8, 4:03 AM CST	Winter Weather Advisory	LOT	23 hr
Jan 8, 5:38 PM CST	Wind Chill Advisory	LOT	16 hr
Jan 9, 3:15 AM CST	Wind Chill Advisory	LOT	30 hr
Jan 26, 4:44 PM CST	Freezing Rain Advisory	LOT	13 hr
Jan 30, 10:37 AM CST	Winter Storm Watch	LOT	16 hr
Jan 31, 2:46 AM CST	Winter Storm Warning	LOT	45 hr
Feb 1, 4:08 AM CST	Blizzard Warning	LOT	23 hr
Feb 14, 3:52 AM CST	Wind Chill Advisory	LOT	29 hr
Feb 18, 3:50 AM CST	Wind Chill Advisory	LOT	32 hr
Feb 19, 2:58 PM CST	Wind Chill Advisory	LOT	15 hr
Feb 22, 3:44 AM CST	Wind Chill Advisory	LOT	29 hr
Feb 26, 3:03 PM CST	Wind Chill Advisory	LOT	18 hr
Mar 2, 11:44 AM CST	Winter Weather Advisory	LOT	24 hr
Mar 10, 1:05 AM CDT	Dense Fog Advisory	LOT	12 hr
Mar 10, 7:05 PM CDT	Dense Fog Advisory	LOT	14 hr
Mar 22, 3:19 PM CDT	Winter Weather Advisory	LOT	21 hr
Mar 23, 12:47 AM CDT	Mesoscale Discussion	SPC	4 hr
Mar 23, 4:58 AM CDT	Mesoscale Discussion	SPC	5 hr
Apr 4, 4:34 PM CDT	Fire Weather Watch	LOT	12 hr
Apr 9, 12:29 PM CDT	Mesoscale Discussion	SPC	91 min
Apr 9, 1:48 PM CDT	Tornado Watch	SPC	9 hr
Apr 9, 3:12 PM CDT	Mesoscale Discussion	SPC	93 min
Apr 9, 5:27 PM CDT	Severe Thunderstorm Warning	LOT	18 min
Apr 9, 6:04 PM CDT	Mesoscale Discussion	SPC	86 min
Apr 9, 6:09 PM CDT	Tornado Warning	LOT	36 min
Apr 9, 6:37 PM CDT	Tornado Warning	LOT	23 min
Apr 9, 6:49 PM CDT	Severe Thunderstorm Warning	LOT	26 min
Apr 9, 6:58 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	LOT	47 min
Apr 9, 7:05 PM CDT	Tornado Warning	LOT	40 min
Apr 9, 7:09 PM CDT	Mesoscale Discussion	SPC	96 min
Apr 9, 7:21 PM CDT	Areal Flood Advisory	LOT	3 hr
Apr 9, 7:36 PM CDT	Severe Thunderstorm Warning	LOT	24 min
Apr 9, 7:53 PM CDT	Severe Thunderstorm Warning	LOT	37 min
Apr 9, 10:27 PM CDT	Wind Advisory	LOT	6 hr
Apr 10, 2:17 PM CDT	Wind Advisory	LOT	5 hr
Apr 21, 3:16 AM CDT	Wind Advisory	LOT	16 hr
Apr 22, 3:25 PM CDT	Freeze Warning	LOT	17 hr
Apr 23, 4:22 PM CDT	Frost Advisory	LOT	16 hr
May 24, 5:34 PM CDT	Tornado Watch	SPC	7 hr
May 26, 11:22 AM CDT	Mesoscale Discussion	SPC	113 min
Jun 7, 6:05 AM CDT	Special Weather Statement	LOT	55 min
Jun 7, 2:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 8, 3:32 PM CDT	Mesoscale Discussion	SPC	88 min
Jun 11, 9:12 AM CDT	Special Weather Statement	LOT	63 min
Jun 11, 2:06 PM CDT	Flash Flood Watch	LOT	20 hr
Jun 13, 8:59 PM CDT	Flash Flood Warning	LOT	6 hr
Jun 15, 4:10 AM CDT	Flash Flood Watch	LOT	24 hr
Jun 15, 7:29 PM CDT	River Flood Advisory	LOT	5 days
Jun 15, 7:32 PM CDT	River Flood Warning	LOT	44 hr
Jun 20, 4:27 PM CDT	Severe Thunderstorm Warning	LOT	48 min
Jun 20, 5:59 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 22, 9:14 AM CDT	Mesoscale Discussion	SPC	61 min
Jun 22, 9:39 AM CDT	Severe Thunderstorm Watch	SPC	3 hr
Jun 22, 9:47 AM CDT	Severe Thunderstorm Warning	LOT	58 min
Jun 22, 10:05 AM CDT	River Flood Advisory	LOT	7 days
Jun 23, 3:08 PM CDT	Flash Flood Watch	LOT	44 hr
Jul 12, 2:19 PM CDT	Flash Flood Watch	LOT	33 hr
Jul 13, 3:49 AM CDT	Mesoscale Discussion	SPC	116 min
Jul 13, 4:14 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 13, 5:05 AM CDT	Severe Thunderstorm Warning	LOT	55 min
Jul 13, 5:41 AM CDT	Severe Thunderstorm Warning	LOT	64 min
Jul 13, 6:28 AM CDT	Areal Flood Advisory	LOT	4 hr
Jul 13, 3:21 PM CDT	Mesoscale Discussion	SPC	84 min
Jul 13, 4:01 PM CDT	Tornado Watch	SPC	7 hr
Jul 13, 6:59 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 13, 8:51 PM CDT	Severe Thunderstorm Warning	LOT	39 min
Jul 13, 9:34 PM CDT	Severe Thunderstorm Warning	LOT	41 min
Jul 16, 9:30 PM CDT	Areal Flood Advisory	LOT	6 hr
Jul 17, 10:45 AM CDT	Heat Advisory	LOT	33 hr
Jul 17, 3:33 PM CDT	Severe Thunderstorm Warning	LOT	57 min
Jul 17, 4:24 PM CDT	Severe Thunderstorm Warning	LOT	66 min
Jul 17, 4:26 PM CDT	Flash Flood Warning	LOT	6 hr
Jul 18, 12:31 PM CDT	Mesoscale Discussion	SPC	119 min
Jul 18, 1:31 PM CDT	Tornado Watch	SPC	5 hr
Jul 18, 1:56 PM CDT	Flash Flood Watch	LOT	5 hr
Aug 2, 8:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 15, 1:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 18, 12:49 PM CDT	Mesoscale Discussion	SPC	116 min
Aug 18, 1:35 PM CDT	Tornado Watch	SPC	8 hr
Aug 18, 3:53 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 18, 7:03 PM CDT	Flash Flood Warning	LOT	7 hr
Aug 18, 8:00 PM CDT	Mesoscale Discussion	SPC	90 min
Aug 31, 12:50 AM CDT	Dense Fog Advisory	LOT	8 hr
Sep 17, 1:49 PM CDT	Mesoscale Discussion	SPC	116 min
Sep 17, 5:23 PM CDT	Severe Thunderstorm Warning	LOT	52 min
Sep 17, 6:02 PM CDT	Severe Thunderstorm Warning	LOT	43 min
Sep 18, 3:43 AM CDT	Flash Flood Watch	LOT	23 hr
Oct 15, 3:43 AM CDT	Freeze Watch	LOT	24 hr
Oct 16, 3:13 AM CDT	Freeze Warning	LOT	30 hr
Oct 19, 3:23 AM CDT	Red Flag Warning	LOT	16 hr
Nov 3, 7:08 PM CST	Dense Fog Advisory	LOT	15 hr
Nov 10, 2:51 PM CST	Wind Advisory	LOT	51 hr
Nov 11, 5:46 PM CST	Mesoscale Discussion	SPC	59 min
Nov 11, 6:16 PM CST	Severe Thunderstorm Watch	SPC	4 hr
Nov 11, 7:05 PM CST	Severe Thunderstorm Warning	LOT	55 min
Nov 19, 3:46 AM CST	Winter Storm Watch	LOT	24 hr
Nov 19, 9:38 AM CST	Wind Advisory	LOT	7 hr
Nov 20, 3:24 AM CST	Winter Storm Warning	LOT	41 hr
Nov 20, 7:33 PM CST	Mesoscale Discussion	SPC	4 hr
Nov 21, 6:28 AM CST	Mesoscale Discussion	SPC	4 hr
Nov 21, 6:32 AM CST	Mesoscale Discussion	SPC	4 hr
Nov 26, 7:38 PM CST	River Flood Advisory	LOT	61 hr
Nov 27, 10:45 AM CST	River Flood Warning	LOT	67 hr
Nov 27, 8:23 PM CST	River Flood Advisory	LOT	7 days
Dec 4, 8:01 PM CST	Dense Fog Advisory	LOT	16 hr
Dec 6, 9:18 PM CST	Dense Fog Advisory	LOT	24 hr
Dec 12, 4:22 AM CST	Dense Fog Advisory	LOT	25 hr
Dec 12, 10:02 AM CST	River Flood Watch	LOT	7 days
Dec 13, 10:48 AM CST	River Flood Watch	LOT	3 days
Dec 14, 8:28 AM CST	River Flood Warning	LOT	56 hr
Dec 14, 8:28 AM CST	River Flood Warning	LOT	6 days
Dec 14, 8:56 AM CST	River Flood Advisory	LOT	7 days
Dec 15, 8:33 PM CST	River Flood Advisory	LOT	7 days
Dec 22, 9:43 AM CST	River Flood Advisory	LOT	7 days
Dec 23, 11:30 AM CST	Wind Advisory	LOT	16 hr
Dec 26, 3:32 PM CST	Winter Storm Watch	LOT	24 hr
Dec 27, 3:07 PM CST	Winter Storm Warning	LOT	33 hr
Dec 28, 5:26 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 28, 12:13 PM CST	Mesoscale Discussion	SPC	5 hr
Dec 28, 5:27 PM CST	Areal Flood Advisory	LOT	12 hr
Dec 28, 6:00 PM CST	Mesoscale Discussion	SPC	5 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	15
Tornado Warning	4
Severe Thunderstorm Watch	5
Tornado Watch	5
Mesoscale Discussion	25
Special Weather Statement	2
Flooding
Flash Flood Warning	3
River Flood Warning	4
Flash Flood Watch	6
River Flood Watch	2
Areal Flood Advisory	5
River Flood Advisory	7
Winter
Blizzard Warning	1
Winter Storm Warning	3
Winter Storm Watch	4
Freezing Rain Advisory	1
Winter Weather Advisory	5
Heat
Heat Advisory	1
Cold
Freeze Warning	2
Wind Chill Warning	1
Freeze Watch	1
Frost Advisory	1
Wind Chill Advisory	9
Wind and dust
Wind Advisory	6
Fire
Red Flag Warning	1
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	7

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2014 2016

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.