Alert archive / Illinois / Mercer County

Weather alerts in Mercer County, Illinois, 2024

169 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Mercer County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts: 169
Warnings: 55
Watches: 26
Advisories: 36
Busiest month: June26 alerts
Busiest day: April 16, 20248 alerts

Over time

By month

Warning verification

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

1 of 3 tornado warnings covering Mercer County in 2024 had a tornado report inside them.

Mercer County, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	1	67%	0
Severe thunderstorm warnings	35	24	31%	14	93%	20 min
Flash flood warnings	0			0

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Quad Cities, IA: tornado warnings	66	18	73%	57	72%	17 min
NWS Quad Cities, IA: severe thunderstorm warnings	364	205	44%	646	82%	25 min
NWS Quad Cities, IA: flash flood warnings	30	9	70%	23	83%	59 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 7, 2:44 AM CST	Winter Storm Watch	DVN	24 hr
Jan 8, 2:43 AM CST	Winter Storm Warning	DVN	48 hr
Jan 9, 9:12 AM CST	Mesoscale Discussion	SPC	3 hr
Jan 9, 1:09 PM CST	Mesoscale Discussion	SPC	3 hr
Jan 10, 3:00 PM CST	Winter Storm Watch	DVN	11 hr
Jan 11, 2:14 AM CST	Winter Storm Warning	DVN	39 hr
Jan 11, 2:14 AM CST	Winter Weather Advisory	DVN	3 days
Jan 11, 3:03 PM CST	Blizzard Warning	DVN	36 hr
Jan 11, 3:03 PM CST	Wind Chill Watch	DVN	47 hr
Jan 12, 10:24 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 13, 3:19 AM CST	Wind Chill Warning	DVN	3 days
Jan 15, 2:02 PM CST	Wind Chill Advisory	DVN	43 hr
Jan 18, 2:37 AM CST	Wind Chill Advisory	DVN	33 hr
Jan 18, 2:37 AM CST	Winter Weather Advisory	DVN	27 hr
Jan 19, 2:16 AM CST	Wind Chill Advisory	DVN	34 hr
Jan 20, 2:01 AM CST	Wind Chill Advisory	DVN	33 hr
Jan 21, 2:29 AM CST	Winter Weather Advisory	DVN	60 hr
Jan 22, 2:08 AM CST	Winter Weather Advisory	DVN	36 hr
Jan 23, 1:29 PM CST	Dense Fog Advisory	DVN	20 hr
Jan 24, 3:57 PM CST	Dense Fog Advisory	DVN	44 hr
Jan 26, 1:30 PM CST	Dense Fog Advisory	DVN	26 hr
Jan 28, 1:49 PM CST	Dense Fog Advisory	DVN	22 hr
Feb 8, 2:25 AM CST	Wind Advisory	DVN	16 hr
Feb 8, 2:53 PM CST	Mesoscale Discussion	SPC	3 hr
Feb 25, 1:27 PM CST	Red Flag Warning	DVN	29 hr
Feb 27, 1:58 AM CST	Wind Advisory	DVN	28 hr
Feb 27, 2:50 PM CST	Mesoscale Discussion	SPC	115 min
Feb 27, 3:53 PM CST	Tornado Watch	SPC	6 hr
Feb 27, 4:56 PM CST	Severe Thunderstorm Warning	DVN	49 min
Feb 27, 5:43 PM CST	Tornado Warning	DVN	18 min
Mar 2, 1:41 PM CST	Red Flag Warning	DVN	28 hr
Mar 3, 8:19 AM CST	Wind Advisory	DVN	10 hr
Mar 4, 1:25 PM CST	Mesoscale Discussion	SPC	2 hr
Mar 4, 2:00 PM CST	Special Weather Statement	DVN	45 min
Mar 4, 3:39 PM CST	Severe Thunderstorm Warning	DVN	51 min
Mar 14, 1:20 AM CDT	Severe Thunderstorm Warning	DVN	40 min
Mar 14, 1:56 AM CDT	Special Weather Statement	DVN	64 min
Mar 14, 2:14 AM CDT	Severe Thunderstorm Warning	DVN	46 min
Mar 24, 2:00 PM CDT	Wind Advisory	DVN	23 hr
Mar 29, 8:35 PM CDT	Severe Thunderstorm Warning	DVN	40 min
Mar 29, 8:50 PM CDT	Severe Thunderstorm Warning	DVN	40 min
Mar 29, 8:52 PM CDT	Mesoscale Discussion	SPC	83 min
Mar 31, 6:38 PM CDT	Special Weather Statement	DVN	52 min
Apr 2, 2:24 PM CDT	Wind Advisory	DVN	30 hr
Apr 7, 1:52 AM CDT	Wind Advisory	DVN	13 hr
Apr 7, 2:05 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 16, 12:06 PM CDT	Tornado Watch	SPC	10 hr
Apr 16, 1:56 PM CDT	Mesoscale Discussion	SPC	64 min
Apr 16, 4:47 PM CDT	Mesoscale Discussion	SPC	88 min
Apr 16, 5:20 PM CDT	Tornado Warning	DVN	40 min
Apr 16, 5:40 PM CDT	Severe Thunderstorm Warning	DVN	50 min
Apr 16, 6:20 PM CDT	Severe Thunderstorm Warning	DVN	36 min
Apr 16, 6:41 PM CDT	Severe Thunderstorm Warning	DVN	49 min
Apr 16, 6:56 PM CDT	Severe Thunderstorm Warning	DVN	64 min
Apr 16, 7:02 PM CDT	Severe Thunderstorm Warning	DVN	43 min
Apr 16, 7:32 PM CDT	Mesoscale Discussion	SPC	88 min
Apr 16, 8:07 PM CDT	Severe Thunderstorm Warning	DVN	23 min
Apr 19, 1:39 PM CDT	Freeze Warning	DVN	18 hr
Apr 20, 1:43 PM CDT	Freeze Warning	DVN	18 hr
Apr 21, 2:15 PM CDT	Frost Advisory	DVN	18 hr
Apr 27, 3:40 PM CDT	Mesoscale Discussion	SPC	95 min
Apr 27, 5:17 PM CDT	Mesoscale Discussion	SPC	58 min
Apr 27, 5:58 PM CDT	Tornado Watch	SPC	6 hr
May 4, 1:56 PM CDT	Mesoscale Discussion	SPC	94 min
May 7, 3:51 AM CDT	Severe Thunderstorm Warning	DVN	39 min
May 7, 4:26 AM CDT	Severe Thunderstorm Warning	DVN	45 min
May 7, 5:24 PM CDT	Mesoscale Discussion	SPC	96 min
May 7, 10:04 PM CDT	Special Weather Statement	DVN	41 min
May 16, 3:26 PM CDT	Special Weather Statement	DVN	49 min
May 16, 3:33 PM CDT	Special Weather Statement	DVN	42 min
May 17, 2:44 AM CDT	Dense Fog Advisory	DVN	6 hr
May 19, 11:28 PM CDT	Severe Thunderstorm Warning	DVN	32 min
May 21, 9:29 AM CDT	Mesoscale Discussion	SPC	91 min
May 21, 12:32 PM CDT	Mesoscale Discussion	SPC	118 min
May 21, 1:14 PM CDT	Tornado Watch PDS	SPC	8 hr
May 23, 9:16 PM CDT	River Flood Watch	DVN	47 hr
May 24, 6:07 AM CDT	Severe Thunderstorm Watch	SPC	9 hr
May 24, 6:38 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	67 min
May 24, 7:32 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	58 min
May 24, 8:26 AM CDT	Severe Thunderstorm Warning	DVN	64 min
May 24, 10:42 AM CDT	Severe Thunderstorm Warning	DVN	22 min
May 24, 5:30 PM CDT	Special Weather Statement	DVN	45 min
May 25, 8:33 PM CDT	River Flood Warning	DVN	15 days
May 26, 11:11 AM CDT	River Flood Watch	DVN	48 hr
May 27, 5:10 PM CDT	Mesoscale Discussion	SPC	2 hr
May 27, 5:38 PM CDT	Severe Thunderstorm Warning	DVN	34 min
May 28, 10:56 AM CDT	River Flood Warning	DVN	10 days
Jun 1, 11:32 PM CDT	Dense Fog Advisory	DVN	9 hr
Jun 13, 2:02 PM CDT	Mesoscale Discussion	SPC	118 min
Jun 13, 2:59 PM CDT	Severe Thunderstorm Watch	SPC	10 hr
Jun 13, 7:01 PM CDT	Severe Thunderstorm Warning	DVN	44 min
Jun 16, 12:33 PM CDT	Mesoscale Discussion	SPC	117 min
Jun 16, 12:55 PM CDT	Special Weather Statement	DVN	65 min
Jun 16, 1:28 PM CDT	Special Weather Statement	DVN	62 min
Jun 16, 1:54 PM CDT	Severe Thunderstorm Warning	DVN	66 min
Jun 17, 2:04 AM CDT	Heat Advisory	DVN	42 hr
Jun 19, 3:58 PM CDT	Mesoscale Discussion	SPC	92 min
Jun 21, 9:39 PM CDT	River Flood Watch	DVN	21 days
Jun 21, 9:39 PM CDT	River Flood Watch	DVN	21 days
Jun 21, 9:39 PM CDT	River Flood Watch	DVN	21 days
Jun 22, 2:55 AM CDT	Heat Advisory	DVN	16 hr
Jun 22, 7:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 24, 12:18 PM CDT	River Flood Warning	DVN	31 days
Jun 24, 12:18 PM CDT	River Flood Warning	DVN	32 days
Jun 24, 9:54 PM CDT	River Flood Warning	DVN	30 days
Jun 25, 8:01 AM CDT	Mesoscale Discussion	SPC	119 min
Jun 25, 11:10 AM CDT	Flood Watch	DVN	15 hr
Jun 25, 4:54 PM CDT	Mesoscale Discussion	SPC	96 min
Jun 25, 5:17 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 25, 7:09 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 25, 8:06 PM CDT	Severe Thunderstorm Warning	DVN	54 min
Jun 25, 8:36 PM CDT	Severe Thunderstorm Warning	DVN	39 min
Jun 25, 9:10 PM CDT	Severe Thunderstorm Warning	DVN	22 min
Jul 2, 2:04 AM CDT	Flood Watch	DVN	23 hr
Jul 2, 3:14 PM CDT	Tornado Watch	SPC	7 hr
Jul 2, 5:13 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 2, 6:30 PM CDT	Severe Thunderstorm Warning	DVN	45 min
Jul 2, 7:04 PM CDT	Severe Thunderstorm Warning	DVN	41 min
Jul 2, 8:00 PM CDT	Severe Thunderstorm Warning	DVN	45 min
Jul 12, 1:46 PM CDT	Heat Advisory	DVN	30 hr
Jul 14, 2:20 AM CDT	Heat Advisory	DVN	19 hr
Jul 14, 3:15 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 14, 8:58 PM CDT	Severe Thunderstorm Warning	DVN	47 min
Jul 14, 9:44 PM CDT	Special Weather Statement	DVN	46 min
Jul 15, 2:33 AM CDT	Heat Advisory	DVN	17 hr
Jul 15, 1:59 PM CDT	Mesoscale Discussion	SPC	3 hr
Jul 15, 3:18 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 15, 5:26 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 15, 6:55 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	50 min
Jul 15, 6:55 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 15, 7:12 PM CDT	Tornado Warning	DVN	48 min
Jul 15, 7:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	52 min
Jul 28, 11:12 PM CDT	Flood Watch	DVN	8 hr
Jul 30, 12:15 PM CDT	Special Weather Statement	DVN	45 min
Jul 30, 2:15 PM CDT	Flood Watch	DVN	44 hr
Jul 31, 3:46 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 31, 11:51 PM CDT	Special Weather Statement	DVN	54 min
Aug 1, 12:33 AM CDT	Special Weather Statement	DVN	57 min
Aug 5, 11:02 AM CDT	Heat Advisory	DVN	9 hr
Aug 15, 8:51 PM CDT	Mesoscale Discussion	SPC	84 min
Aug 15, 9:08 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 15, 9:27 PM CDT	Special Weather Statement	DVN	78 min
Aug 25, 2:11 AM CDT	Excessive Heat Watch	DVN	37 hr
Aug 25, 2:11 AM CDT	Excessive Heat Warning	DVN	66 hr
Aug 27, 4:47 PM CDT	Mesoscale Discussion	SPC	88 min
Aug 27, 8:34 PM CDT	Severe Thunderstorm Warning	DVN	41 min
Aug 27, 10:02 PM CDT	Special Weather Statement	DVN	43 min
Oct 4, 3:15 AM CDT	Severe Thunderstorm Warning	DVN	45 min
Oct 14, 2:51 AM CDT	Freeze Watch	DVN	11 hr
Oct 14, 2:07 PM CDT	Freeze Warning	DVN	43 hr
Oct 24, 8:32 PM CDT	Severe Thunderstorm Warning	DVN	43 min
Oct 24, 10:03 PM CDT	Severe Thunderstorm Warning	DVN	42 min
Oct 29, 10:12 AM CDT	Red Flag Warning	DVN	8 hr
Nov 14, 9:03 PM CST	Dense Fog Advisory	DVN	12 hr
Nov 18, 8:10 PM CST	Wind Advisory	DVN	10 hr
Nov 21, 1:55 AM CST	Wind Advisory	DVN	18 hr
Dec 4, 2:28 AM CST	Wind Advisory	DVN	22 hr
Dec 11, 2:45 AM CST	Special Weather Statement	DVN	45 min
Dec 11, 3:31 AM CST	Special Weather Statement	DVN	44 min
Dec 11, 4:24 AM CST	Special Weather Statement	DVN	66 min
Dec 11, 8:16 AM CST	Special Weather Statement	DVN	89 min
Dec 11, 9:51 AM CST	Special Weather Statement	DVN	84 min
Dec 12, 2:39 PM CST	Winter Weather Advisory	DVN	51 hr
Dec 13, 2:48 AM CST	Ice Storm Warning	DVN	39 hr
Dec 14, 4:58 AM CST	Mesoscale Discussion	SPC	6 hr
Dec 14, 9:31 PM CST	Dense Fog Advisory	DVN	14 hr
Dec 15, 2:35 PM CST	Dense Fog Advisory	DVN	21 hr
Dec 25, 1:27 PM CST	Dense Fog Advisory	DVN	42 hr
Dec 28, 8:19 PM CST	Dense Fog Advisory	DVN	16 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	35
Tornado Warning	3
Severe Thunderstorm Watch	7
Tornado Watch	5
Mesoscale Discussion	32
Special Weather Statement	20
Flooding
River Flood Warning	5
Flood Watch	4
River Flood Watch	5
Winter
Blizzard Warning	1
Ice Storm Warning	1
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	5
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	6
Cold
Freeze Warning	3
Wind Chill Warning	1
Freeze Watch	1
Wind Chill Watch	1
Frost Advisory	1
Wind Chill Advisory	4
Wind and dust
Wind Advisory	9
Fire
Red Flag Warning	3
Fog and smoke
Dense Fog Advisory	11

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2023 2025

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.