Alert archive / Illinois / Rock Island County

Weather alerts in Rock Island County, Illinois, 2017

186 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Rock Island County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts: 186
Warnings: 64
Watches: 43
Advisories: 31
Busiest month: July41 alerts
Busiest day: July 21, 201710 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 5 tornado warnings covering Rock Island County in 2017 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 24 minutes after it went out.

Rock Island County, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	3	40%	1	100%	24 min
Severe thunderstorm warnings	23	19	17%	11	45%	27 min
Flash flood warnings	3	1	67%	0

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Quad Cities, IA: tornado warnings	52	21	60%	52	54%	16 min
NWS Quad Cities, IA: severe thunderstorm warnings	197	152	23%	505	78%	27 min
NWS Quad Cities, IA: flash flood warnings	25	15	40%	38	87%	113 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, 4:31 PM CST	Dense Fog Advisory	DVN	15 hr
Jan 10, 9:41 AM CST	Wind Advisory	DVN	11 hr
Jan 10, 10:07 AM CST	River Flood Watch	DVN	8 days
Jan 10, 11:09 AM CST	Special Weather Statement	DVN	21 min
Jan 11, 4:25 AM CST	River Flood Warning	DVN	12 days
Jan 12, 3:33 PM CST	Winter Storm Watch	DVN	48 hr
Jan 14, 3:47 PM CST	Winter Weather Advisory	DVN	47 hr
Jan 16, 4:30 PM CST	Dense Fog Advisory	DVN	14 hr
Jan 17, 11:36 AM CST	River Flood Warning	DVN	7 days
Jan 19, 3:26 PM CST	Dense Fog Advisory	DVN	21 hr
Jan 20, 3:14 AM CST	Flash Flood Warning	DVN	6 hr
Jan 20, 3:14 PM CST	Dense Fog Advisory	DVN	21 hr
Jan 21, 3:50 PM CST	Dense Fog Advisory	DVN	19 hr
Feb 6, 9:10 PM CST	Dense Fog Advisory	DVN	15 hr
Feb 7, 12:21 AM CST	Special Weather Statement	DVN	24 min
Feb 22, 12:26 AM CST	Dense Fog Advisory	DVN	10 hr
Feb 26, 11:59 AM CST	River Flood Watch	DVN	47 hr
Feb 26, 11:59 AM CST	River Flood Watch	DVN	47 hr
Feb 28, 10:39 AM CST	River Flood Warning	DVN	6 days
Feb 28, 10:39 AM CST	River Flood Warning	DVN	7 days
Feb 28, 10:52 AM CST	River Flood Watch	DVN	4 days
Feb 28, 2:03 PM CST	Mesoscale Discussion	SPC	2 hr
Feb 28, 2:57 PM CST	Tornado Watch	SPC	7 hr
Feb 28, 3:28 PM CST	Tornado Warning	DVN	47 min
Feb 28, 5:24 PM CST	Mesoscale Discussion	SPC	96 min
Feb 28, 8:22 PM CST	Severe Thunderstorm Warning	DVN	23 min
Feb 28, 8:32 PM CST	Severe Thunderstorm Warning	DVN	30 min
Mar 1, 9:40 PM CST	River Flood Watch	DVN	7 days
Mar 6, 7:42 PM CST	Mesoscale Discussion	SPC	63 min
Mar 6, 8:52 PM CST	Tornado Watch	SPC	6 hr
Mar 6, 9:52 PM CST	Severe Thunderstorm Warning	DVN	83 min
Mar 6, 10:10 PM CST	Tornado Warning	DVN	24 min
Mar 6, 10:26 PM CST	Severe Thunderstorm Warning	DVN	49 min
Mar 7, 3:32 AM CST	Red Flag Warning	DVN	14 hr
Mar 8, 3:18 AM CST	Wind Advisory	DVN	14 hr
Mar 8, 10:21 AM CST	Red Flag Warning	DVN	8 hr
Mar 11, 3:36 PM CST	Winter Storm Watch	DVN	12 hr
Mar 12, 4:27 AM CDT	Winter Weather Advisory	DVN	33 hr
Mar 19, 11:50 PM CDT	Mesoscale Discussion	SPC	85 min
Mar 26, 5:22 AM CDT	Dense Fog Advisory	DVN	7 hr
Apr 4, 12:46 AM CDT	River Flood Warning	DVN	7 days
Apr 4, 8:46 PM CDT	River Flood Warning	DVN	7 days
Apr 10, 1:53 AM CDT	Mesoscale Discussion	SPC	2 hr
Apr 10, 2:44 AM CDT	Special Weather Statement	DVN	61 min
Apr 15, 5:06 PM CDT	Mesoscale Discussion	SPC	84 min
Apr 15, 7:03 PM CDT	Severe Thunderstorm Warning	DVN	43 min
Apr 15, 11:53 PM CDT	Special Weather Statement	DVN	112 min
Apr 16, 9:37 AM CDT	River Flood Warning	DVN	7 days
Apr 16, 9:50 AM CDT	River Flood Watch	DVN	6 days
Apr 19, 8:57 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Apr 28, 9:57 AM CDT	River Flood Watch	DVN	25 hr
Apr 28, 9:57 AM CDT	River Flood Watch	DVN	25 hr
Apr 28, 11:05 AM CDT	River Flood Watch	DVN	25 hr
Apr 28, 11:05 AM CDT	River Flood Watch	DVN	25 hr
Apr 28, 11:05 AM CDT	River Flood Watch	DVN	25 hr
Apr 29, 11:07 AM CDT	River Flood Warning	DVN	17 days
Apr 29, 11:07 AM CDT	River Flood Warning	DVN	9 days
Apr 29, 11:43 AM CDT	River Flood Warning	DVN	4 days
Apr 29, 11:43 AM CDT	River Flood Warning	DVN	4 days
Apr 29, 11:43 AM CDT	River Flood Warning	DVN	7 days
Apr 29, 4:41 PM CDT	Special Weather Statement	DVN	79 min
Apr 30, 8:14 PM CDT	Special Weather Statement	DVN	61 min
May 2, 3:16 AM CDT	Frost Advisory	DVN	28 hr
May 10, 12:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 10, 8:13 PM CDT	River Flood Warning	DVN	6 days
May 11, 10:22 AM CDT	River Flood Warning	DVN	6 days
May 17, 9:16 AM CDT	Special Weather Statement	DVN	29 min
May 17, 3:24 PM CDT	Mesoscale Discussion	SPC	66 min
May 17, 3:44 PM CDT	Tornado Watch	SPC	9 hr
May 17, 4:40 PM CDT	Tornado Warning	DVN	50 min
May 17, 5:24 PM CDT	Severe Thunderstorm Warning	DVN	30 min
May 17, 6:38 PM CDT	Severe Thunderstorm Warning	DVN	52 min
May 17, 7:14 PM CDT	Severe Thunderstorm Warning	DVN	61 min
May 17, 7:30 PM CDT	Severe Thunderstorm Warning	DVN	45 min
May 17, 7:37 PM CDT	Severe Thunderstorm Warning	DVN	38 min
May 17, 8:05 PM CDT	Tornado Warning Tornado observed	DVN	40 min
May 17, 8:08 PM CDT	Severe Thunderstorm Warning	DVN	67 min
May 17, 9:00 PM CDT	Severe Thunderstorm Warning	DVN	60 min
May 22, 10:42 AM CDT	River Flood Watch	DVN	50 hr
May 22, 10:42 AM CDT	River Flood Watch	DVN	50 hr
May 23, 12:30 PM CDT	River Flood Watch	DVN	24 hr
May 23, 12:30 PM CDT	River Flood Watch	DVN	24 hr
May 23, 12:30 PM CDT	River Flood Watch	DVN	24 hr
May 24, 12:04 PM CDT	River Flood Warning	DVN	11 days
May 24, 12:04 PM CDT	River Flood Warning	DVN	9 days
May 24, 12:04 PM CDT	River Flood Warning	DVN	12 days
May 24, 12:04 PM CDT	River Flood Warning	DVN	12 days
May 24, 12:04 PM CDT	River Flood Warning	DVN	13 days
May 27, 1:53 AM CDT	Dense Fog Advisory	DVN	8 hr
Jun 13, 10:42 AM CDT	Heat Advisory	DVN	9 hr
Jun 14, 12:06 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 14, 12:40 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 15, 9:44 PM CDT	Severe Thunderstorm Warning	DVN	46 min
Jun 16, 10:25 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 17, 1:35 AM CDT	Mesoscale Discussion	SPC	115 min
Jun 17, 2:00 AM CDT	Special Weather Statement	DVN	60 min
Jun 17, 3:06 AM CDT	Special Weather Statement	DVN	54 min
Jun 17, 2:44 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 17, 5:36 PM CDT	Severe Thunderstorm Warning	DVN	39 min
Jun 17, 5:39 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 17, 6:05 PM CDT	Severe Thunderstorm Warning	DVN	40 min
Jun 17, 8:17 PM CDT	Mesoscale Discussion	SPC	58 min
Jun 19, 12:44 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 19, 4:45 PM CDT	Special Weather Statement	DVN	30 min
Jun 20, 2:05 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 28, 2:53 PM CDT	Tornado Watch	SPC	9 hr
Jun 29, 10:52 AM CDT	River Flood Warning	DVN	8 days
Jun 29, 10:52 AM CDT	River Flood Warning	DVN	7 days
Jul 10, 1:49 AM CDT	Mesoscale Discussion	SPC	116 min
Jul 10, 3:52 AM CDT	Special Weather Statement	DVN	53 min
Jul 12, 4:05 AM CDT	Heat Advisory	DVN	16 hr
Jul 12, 3:13 PM CDT	Flash Flood Watch	DVN	12 hr
Jul 12, 3:55 PM CDT	River Flood Watch	DVN	7 days
Jul 17, 3:37 PM CDT	Excessive Heat Watch	DVN	36 hr
Jul 18, 3:08 PM CDT	Excessive Heat Warning	DVN	4 days
Jul 18, 6:28 PM CDT	Special Weather Statement	DVN	47 min
Jul 18, 7:05 PM CDT	Special Weather Statement	DVN	55 min
Jul 19, 3:50 AM CDT	Heat Advisory	DVN	4 days
Jul 19, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 20, 8:39 AM CDT	River Flood Watch	DVN	6 days
Jul 20, 9:54 AM CDT	River Flood Watch	DVN	6 days
Jul 20, 3:55 PM CDT	Flash Flood Watch	DVN	41 hr
Jul 20, 4:14 PM CDT	River Flood Warning	DVN	17 days
Jul 20, 4:14 PM CDT	River Flood Warning	DVN	15 days
Jul 20, 8:45 PM CDT	Severe Thunderstorm Warning	DVN	31 min
Jul 20, 9:44 PM CDT	Severe Thunderstorm Warning	DVN	46 min
Jul 20, 10:13 PM CDT	Severe Thunderstorm Warning	DVN	45 min
Jul 20, 10:39 PM CDT	Severe Thunderstorm Warning	DVN	35 min
Jul 21, 1:27 AM CDT	Special Weather Statement	DVN	63 min
Jul 21, 1:32 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 21, 4:52 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 21, 6:10 PM CDT	Tornado Warning	DVN	50 min
Jul 21, 6:28 PM CDT	Mesoscale Discussion	SPC	92 min
Jul 21, 6:50 PM CDT	Special Weather Statement	DVN	55 min
Jul 21, 7:33 PM CDT	Severe Thunderstorm Warning	DVN	57 min
Jul 21, 7:33 PM CDT	Severe Thunderstorm Warning	DVN	57 min
Jul 21, 8:35 PM CDT	Mesoscale Discussion	SPC	115 min
Jul 21, 11:23 PM CDT	Mesoscale Discussion	SPC	67 min
Jul 22, 12:10 PM CDT	River Flood Warning	DVN	7 days
Jul 22, 12:20 PM CDT	Areal Flood Warning	DVN	12 hr
Jul 22, 12:23 PM CDT	River Flood Watch	DVN	5 days
Jul 22, 12:23 PM CDT	River Flood Watch	DVN	7 days
Jul 22, 12:23 PM CDT	River Flood Watch	DVN	8 days
Jul 23, 11:36 AM CDT	River Flood Warning	DVN	6 days
Jul 23, 11:36 AM CDT	River Flood Warning	DVN	6 days
Jul 26, 3:23 AM CDT	Flash Flood Watch	DVN	20 hr
Jul 26, 4:55 PM CDT	Mesoscale Discussion	SPC	65 min
Jul 26, 5:01 PM CDT	Special Weather Statement	DVN	59 min
Jul 26, 6:02 PM CDT	Special Weather Statement	DVN	58 min
Aug 2, 4:16 PM CDT	Special Weather Statement	DVN	59 min
Aug 3, 5:18 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 10, 2:07 PM CDT	Mesoscale Discussion	SPC	113 min
Aug 10, 2:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 10, 4:46 PM CDT	Severe Thunderstorm Warning	DVN	44 min
Aug 10, 5:31 PM CDT	Mesoscale Discussion	SPC	89 min
Aug 16, 2:35 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 28, 2:18 AM CDT	Dense Fog Advisory	DVN	9 hr
Aug 29, 2:41 AM CDT	Dense Fog Advisory	DVN	8 hr
Aug 30, 4:52 AM CDT	Dense Fog Advisory	DVN	4 hr
Sep 19, 12:50 AM CDT	Dense Fog Advisory	DVN	9 hr
Sep 20, 7:38 PM CDT	Special Weather Statement	DVN	67 min
Sep 20, 7:40 PM CDT	Special Weather Statement	DVN	65 min
Sep 20, 7:58 PM CDT	Severe Thunderstorm Warning	DVN	47 min
Sep 20, 8:37 PM CDT	Flash Flood Warning	DVN	6 hr
Sep 21, 2:08 AM CDT	Flash Flood Warning	DVN	6 hr
Sep 22, 10:16 AM CDT	Heat Advisory	DVN	9 hr
Oct 14, 1:48 AM CDT	Special Weather Statement	DVN	57 min
Oct 14, 2:18 AM CDT	Special Weather Statement	DVN	27 min
Oct 14, 3:30 AM CDT	Flash Flood Watch	DVN	19 hr
Oct 14, 9:42 AM CDT	Special Weather Statement	DVN	48 min
Oct 14, 5:09 PM CDT	Tornado Watch	SPC	8 hr
Oct 14, 10:49 PM CDT	River Flood Watch	DVN	4 days
Oct 27, 3:39 AM CDT	Freeze Warning	DVN	53 hr
Nov 2, 1:31 AM CDT	Dense Fog Advisory	DVN	9 hr
Nov 4, 11:19 PM CDT	Dense Fog Advisory	DVN	8 hr
Nov 12, 9:39 PM CST	Dense Fog Advisory	DVN	14 hr
Dec 4, 6:26 PM CST	Special Weather Statement	DVN	79 min
Dec 4, 9:58 PM CST	Wind Advisory	DVN	20 hr
Dec 13, 3:26 AM CST	Wind Advisory	DVN	17 hr
Dec 23, 3:20 AM CST	Winter Weather Advisory	DVN	39 hr
Dec 24, 1:31 PM CST	Special Weather Statement	DVN	3 hr
Dec 26, 1:25 PM CST	Wind Chill Advisory	DVN	22 hr
Dec 28, 3:15 PM CST	Winter Weather Advisory	DVN	29 hr
Dec 29, 3:24 AM CST	Winter Storm Warning	DVN	17 hr
Dec 29, 3:11 PM CST	Wind Chill Advisory	DVN	54 hr
Dec 29, 8:14 PM CST	Winter Storm Warning	DVN	106 min

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	5
Severe Thunderstorm Watch	8
Tornado Watch	5
Mesoscale Discussion	23
Special Weather Statement	25
Flooding
Areal Flood Warning	1
Flash Flood Warning	3
River Flood Warning	26
Flash Flood Watch	4
River Flood Watch	23
Winter
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	4
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	4
Cold
Freeze Warning	1
Frost Advisory	1
Wind Chill Advisory	2
Wind and dust
Wind Advisory	4
Fire
Red Flag Warning	2
Fog and smoke
Dense Fog Advisory	16

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2016 2018

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.