Alert archive / Illinois / Rock Island County

Weather alerts in Rock Island County, Illinois, 2015

144 weather alerts in 2015, 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 2015. Tap one for its archive.

Alerts: 144
Warnings: 40
Watches: 25
Advisories: 31
Busiest month: June31 alerts
Busiest day: July 13, 20156 alerts

Over time

By month

Warning verification

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

2 of 5 tornado warnings covering Rock Island County in 2015 had a tornado report inside them; 4 of 6 tornado reports fell inside a warning, on average 10 minutes after it went out.

Rock Island County, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	2	60%	6	67%	10 min
Severe thunderstorm warnings	11	8	27%	13	54%	18 min
Flash flood warnings	4	4	0%	2	100%	128 min

Each office's whole area, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Quad Cities, IA: tornado warnings	25	8	68%	42	50%	17 min
NWS Quad Cities, IA: severe thunderstorm warnings	131	86	34%	316	72%	20 min
NWS Quad Cities, IA: flash flood warnings	30	23	23%	60	88%	65 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 4, 3:06 AM CST	Wind Chill Advisory	DVN	31 hr
Jan 4, 3:17 AM CST	Winter Storm Watch	DVN	13 hr
Jan 4, 3:56 PM CST	Winter Storm Warning	DVN	34 hr
Jan 5, 12:25 PM CST	Mesoscale Discussion	SPC	6 hr
Jan 5, 6:29 PM CST	Mesoscale Discussion	SPC	5 hr
Jan 6, 3:42 AM CST	Wind Chill Warning	DVN	36 hr
Jan 7, 3:21 PM CST	Wind Chill Advisory	DVN	21 hr
Jan 8, 2:03 PM CST	Winter Weather Advisory	DVN	18 hr
Jan 8, 9:04 PM CST	Wind Chill Advisory	DVN	36 hr
Jan 30, 10:38 AM CST	Winter Storm Watch	DVN	17 hr
Jan 31, 3:53 AM CST	Winter Storm Warning	DVN	44 hr
Jan 31, 10:13 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 14, 3:07 AM CST	Wind Chill Advisory	DVN	26 hr
Feb 17, 3:21 AM CST	Wind Chill Advisory	DVN	56 hr
Feb 22, 4:21 AM CST	Wind Chill Advisory	DVN	30 hr
Feb 24, 3:03 PM CST	Winter Weather Advisory	DVN	39 hr
Feb 26, 3:14 PM CST	Wind Chill Advisory	DVN	18 hr
Feb 27, 3:00 PM CST	Wind Chill Advisory	DVN	18 hr
Mar 2, 3:12 PM CST	Winter Weather Advisory	DVN	21 hr
Mar 10, 1:42 AM CDT	Dense Fog Advisory	DVN	10 hr
Mar 22, 3:32 PM CDT	Winter Weather Advisory	DVN	18 hr
Apr 1, 3:42 AM CDT	Red Flag Warning	DVN	15 hr
Apr 9, 12:29 PM CDT	Mesoscale Discussion	SPC	91 min
Apr 9, 12:58 PM CDT	Tornado Watch	SPC	6 hr
Apr 9, 3:12 PM CDT	Mesoscale Discussion	SPC	93 min
Apr 9, 6:04 PM CDT	Mesoscale Discussion	SPC	86 min
Apr 9, 6:39 PM CDT	Special Weather Statement	DVN	2 hr
Apr 10, 1:09 PM CDT	Wind Advisory	DVN	6 hr
Apr 20, 9:05 AM CDT	Special Weather Statement	DVN	3 hr
Apr 20, 11:49 AM CDT	Special Weather Statement	DVN	3 hr
Apr 20, 2:39 PM CDT	Special Weather Statement	DVN	3 hr
Apr 21, 4:12 AM CDT	Wind Advisory	DVN	15 hr
Apr 22, 3:19 PM CDT	Freeze Warning	DVN	17 hr
Apr 23, 3:16 PM CDT	Frost Advisory	DVN	17 hr
May 10, 5:17 PM CDT	Mesoscale Discussion	SPC	88 min
May 24, 3:34 PM CDT	Mesoscale Discussion	SPC	56 min
May 24, 5:34 PM CDT	Tornado Watch	SPC	7 hr
May 24, 6:41 PM CDT	Mesoscale Discussion	SPC	94 min
May 24, 7:04 PM CDT	Tornado Warning Tornado observed	DVN	26 min
Jun 7, 4:12 AM CDT	Special Weather Statement	DVN	63 min
Jun 7, 5:14 AM CDT	Special Weather Statement	DVN	61 min
Jun 7, 6:22 AM CDT	Special Weather Statement	DVN	113 min
Jun 11, 10:56 AM CDT	Flash Flood Watch	DVN	18 hr
Jun 11, 5:32 PM CDT	Tornado Warning	DVN	28 min
Jun 13, 2:42 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 13, 6:34 PM CDT	Special Weather Statement	DVN	41 min
Jun 15, 7:37 AM CDT	Flash Flood Watch	DVN	13 hr
Jun 15, 3:28 PM CDT	Flash Flood Warning	DVN	6 hr
Jun 15, 4:01 PM CDT	Severe Thunderstorm Warning	DVN	44 min
Jun 15, 9:26 PM CDT	River Flood Warning	DVN	9 days
Jun 15, 9:26 PM CDT	River Flood Warning	DVN	7 days
Jun 20, 12:48 PM CDT	Mesoscale Discussion	SPC	117 min
Jun 20, 3:10 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 20, 3:49 PM CDT	Tornado Watch	SPC	7 hr
Jun 20, 6:33 PM CDT	Mesoscale Discussion	SPC	57 min
Jun 20, 10:12 PM CDT	Mesoscale Discussion	SPC	63 min
Jun 22, 9:39 AM CDT	Severe Thunderstorm Watch	SPC	3 hr
Jun 22, 1:22 PM CDT	Mesoscale Discussion	SPC	113 min
Jun 22, 3:56 PM CDT	Tornado Watch	SPC	9 hr
Jun 22, 6:08 PM CDT	Mesoscale Discussion	SPC	67 min
Jun 22, 7:19 PM CDT	Tornado Warning	DVN	15 min
Jun 22, 8:16 PM CDT	Mesoscale Discussion	SPC	59 min
Jun 23, 3:39 PM CDT	Flash Flood Watch	DVN	42 hr
Jun 24, 2:27 AM CDT	River Flood Warning	DVN	68 hr
Jun 24, 9:26 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 29, 4:31 AM CDT	Dense Fog Advisory	DVN	4 hr
Jun 29, 7:32 PM CDT	Special Weather Statement	DVN	43 min
Jun 29, 8:11 PM CDT	Special Weather Statement	DVN	49 min
Jun 29, 9:39 PM CDT	Special Weather Statement	DVN	51 min
Jun 29, 9:48 PM CDT	Severe Thunderstorm Warning	DVN	27 min
Jul 6, 3:16 PM CDT	Special Weather Statement	DVN	59 min
Jul 6, 3:59 PM CDT	Severe Thunderstorm Warning	DVN	46 min
Jul 6, 4:29 PM CDT	Severe Thunderstorm Warning	DVN	46 min
Jul 6, 6:17 PM CDT	Flash Flood Warning	DVN	6 hr
Jul 6, 7:21 PM CDT	Flash Flood Warning	DVN	6 hr
Jul 11, 2:15 PM CDT	Flash Flood Watch	DVN	11 hr
Jul 12, 3:24 PM CDT	Heat Advisory	DVN	29 hr
Jul 13, 5:16 AM CDT	Special Weather Statement	DVN	29 min
Jul 13, 6:00 AM CDT	Special Weather Statement	DVN	2 hr
Jul 13, 2:20 PM CDT	Excessive Heat Warning	DVN	6 hr
Jul 13, 4:01 PM CDT	Tornado Watch	SPC	7 hr
Jul 13, 5:08 PM CDT	Severe Thunderstorm Warning	DVN	27 min
Jul 13, 6:59 PM CDT	Mesoscale Discussion	SPC	91 min
Jul 16, 3:54 AM CDT	Flash Flood Watch	DVN	21 hr
Jul 16, 3:41 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 16, 6:57 PM CDT	Tornado Warning	DVN	36 min
Jul 16, 8:05 PM CDT	Flash Flood Warning	DVN	3 hr
Jul 17, 3:16 AM CDT	Heat Advisory	DVN	33 hr
Jul 18, 12:31 PM CDT	Mesoscale Discussion	SPC	119 min
Jul 18, 1:31 PM CDT	Tornado Watch	SPC	5 hr
Jul 25, 3:02 AM CDT	Heat Advisory	DVN	9 hr
Jul 25, 4:52 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 28, 3:24 PM CDT	Flash Flood Watch	DVN	12 hr
Aug 2, 8:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 2, 8:49 PM CDT	Severe Thunderstorm Warning	DVN	26 min
Aug 2, 9:07 PM CDT	Special Weather Statement	DVN	23 min
Aug 2, 9:18 PM CDT	Severe Thunderstorm Warning	DVN	27 min
Aug 10, 5:03 AM CDT	Dense Fog Advisory	DVN	3 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, 4:26 PM CDT	Severe Thunderstorm Warning	DVN	64 min
Aug 30, 12:40 AM CDT	Dense Fog Advisory	DVN	10 hr
Aug 30, 7:14 PM CDT	Dense Fog Advisory	DVN	11 hr
Sep 7, 3:24 AM CDT	Flash Flood Watch	DVN	28 hr
Sep 17, 7:50 PM CDT	Severe Thunderstorm Warning	DVN	25 min
Sep 17, 9:14 PM CDT	Severe Thunderstorm Warning	DVN	31 min
Sep 18, 3:51 AM CDT	Flash Flood Watch	DVN	20 hr
Sep 18, 8:50 PM CDT	Special Weather Statement	DVN	55 min
Oct 15, 3:08 PM CDT	Freeze Watch	DVN	13 hr
Oct 16, 3:45 AM CDT	Freeze Warning	DVN	29 hr
Oct 18, 2:15 PM CDT	Red Flag Warning	DVN	29 hr
Nov 3, 1:31 AM CST	Dense Fog Advisory	DVN	8 hr
Nov 3, 7:31 PM CST	Dense Fog Advisory	DVN	10 hr
Nov 5, 9:19 PM CST	Special Weather Statement	DVN	56 min
Nov 10, 3:33 PM CST	Wind Advisory	DVN	50 hr
Nov 11, 2:24 PM CST	Mesoscale Discussion	SPC	2 hr
Nov 11, 3:20 PM CST	Tornado Watch	SPC	6 hr
Nov 11, 5:20 PM CST	Severe Thunderstorm Warning	DVN	55 min
Nov 18, 3:11 AM CST	Special Weather Statement	DVN	109 min
Nov 19, 3:36 AM CST	Wind Advisory	DVN	14 hr
Nov 19, 4:11 AM CST	Winter Storm Watch	DVN	11 hr
Nov 19, 3:32 PM CST	Winter Storm Warning	DVN	44 hr
Nov 21, 6:28 AM CST	Mesoscale Discussion	SPC	4 hr
Nov 21, 6:32 AM CST	Mesoscale Discussion	SPC	4 hr
Nov 27, 9:25 PM CST	River Flood Warning	DVN	4 days
Dec 2, 3:45 AM CST	Special Weather Statement	DVN	75 min
Dec 6, 9:33 PM CST	Dense Fog Advisory	DVN	17 hr
Dec 10, 12:52 PM CST	Wind Advisory	DVN	4 hr
Dec 11, 9:53 PM CST	Dense Fog Advisory	DVN	14 hr
Dec 14, 9:59 AM CST	River Flood Warning	DVN	8 days
Dec 14, 9:59 AM CST	River Flood Warning	DVN	6 days
Dec 22, 9:11 AM CST	River Flood Warning	DVN	10 days
Dec 23, 10:51 AM CST	River Flood Warning	DVN	6 days
Dec 23, 12:42 PM CST	Mesoscale Discussion	SPC	2 hr
Dec 23, 1:55 PM CST	Tornado Watch	SPC	4 hr
Dec 23, 2:23 PM CST	Wind Advisory	DVN	9 hr
Dec 23, 3:24 PM CST	Mesoscale Discussion	SPC	96 min
Dec 23, 4:45 PM CST	Tornado Warning	DVN	30 min
Dec 24, 10:21 AM CST	River Flood Warning	DVN	5 days
Dec 26, 3:57 PM CST	Winter Storm Watch	DVN	24 hr
Dec 27, 4:03 PM CST	Winter Storm Warning	DVN	38 hr
Dec 28, 5:26 AM CST	Mesoscale Discussion	SPC	4 hr
Dec 29, 10:04 AM CST	River Flood Warning	DVN	5 days

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
Tornado Warning	5
Severe Thunderstorm Watch	3
Tornado Watch	9
Mesoscale Discussion	29
Special Weather Statement	19
Flooding
Flash Flood Warning	4
River Flood Warning	10
Flash Flood Watch	8
Winter
Winter Storm Warning	4
Winter Storm Watch	4
Winter Weather Advisory	4
Heat
Excessive Heat Warning	1
Heat Advisory	3
Cold
Freeze Warning	2
Wind Chill Warning	1
Freeze Watch	1
Frost Advisory	1
Wind Chill Advisory	8
Wind and dust
Wind Advisory	6
Fire
Red Flag Warning	2
Fog and smoke
Dense Fog Advisory	9

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.