Alert archive / Pennsylvania / Chester County

Weather alerts in Chester County, Pennsylvania, 2018

301 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Chester County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts: 301
Warnings: 98
Watches: 30
Advisories: 111
Busiest month: July53 alerts
Busiest day: November 3, 201816 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 3 tornado warnings covering Chester County in 2018 had a tornado report inside them.

Chester County, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	0	100%	0
Severe thunderstorm warnings	25	15	40%	18	83%	24 min
Flash flood warnings	16	10	38%	14	93%	82 min

Each office's whole area, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Philadelphia/Mount Holly: tornado warnings	10	2	80%	4	50%	6 min
NWS Philadelphia/Mount Holly: severe thunderstorm warnings	110	56	49%	277	81%	27 min
NWS Philadelphia/Mount Holly: flash flood warnings	113	54	52%	174	94%	92 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 3, 4:03 AM EST	Winter Weather Advisory	PHI	38 hr
Jan 4, 3:48 AM EST	Wind Chill Advisory	PHI	3 days
Jan 7, 2:50 PM EST	Winter Weather Advisory	PHI	33 hr
Jan 15, 3:13 PM EST	Winter Weather Advisory	PHI	44 hr
Jan 23, 5:35 AM EST	Areal Flood Advisory	PHI	4 hr
Jan 23, 9:58 AM EST	Special Weather Statement	PHI	47 min
Jan 23, 10:42 AM EST	Special Weather Statement	PHI	48 min
Feb 3, 3:11 PM EST	Winter Weather Advisory	PHI	30 hr
Feb 4, 6:01 PM EST	Areal Flood Advisory	PHI	4 hr
Feb 6, 3:37 PM EST	Winter Weather Advisory	PHI	27 hr
Feb 10, 3:20 AM EST	Flood Watch	PHI	39 hr
Feb 10, 11:01 PM EST	Dense Fog Advisory	PHI	8 hr
Feb 11, 7:53 AM EST	Areal Flood Advisory	PHI	16 hr
Feb 11, 10:51 AM EST	Areal Flood Advisory	PHI	8 hr
Feb 11, 10:57 AM EST	Areal Flood Advisory	PHI	12 hr
Feb 16, 3:51 AM EST	Winter Storm Watch	PHI	24 hr
Feb 17, 3:45 AM EST	Winter Weather Advisory	PHI	20 hr
Feb 17, 6:32 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 19, 11:00 PM EST	Dense Fog Advisory	PHI	11 hr
Feb 24, 3:24 AM EST	Dense Fog Advisory	PHI	5 hr
Feb 25, 10:36 PM EST	Dense Fog Advisory	PHI	7 hr
Feb 28, 3:12 PM EST	High Wind Watch	PHI	24 hr
Mar 1, 11:44 AM EST	High Wind Warning	PHI	40 hr
Mar 1, 3:30 PM EST	Wind Advisory	PHI	45 hr
Mar 2, 6:29 AM EST	Areal Flood Advisory	PHI	4 hr
Mar 2, 10:23 AM EST	Areal Flood Advisory	PHI	4 hr
Mar 5, 3:34 AM EST	Winter Storm Watch	PHI	36 hr
Mar 6, 3:37 AM EST	Winter Storm Warning	PHI	41 hr
Mar 7, 1:25 PM EST	Mesoscale Discussion	SPC	6 hr
Mar 19, 3:36 PM EDT	Winter Storm Watch	PHI	13 hr
Mar 19, 3:36 PM EDT	Winter Weather Advisory	PHI	13 hr
Mar 20, 4:41 AM EDT	Winter Storm Warning	PHI	47 hr
Mar 20, 12:19 PM EDT	Mesoscale Discussion	SPC	4 hr
Mar 25, 9:17 AM EDT	Special Weather Statement	PHI	118 min
Apr 1, 4:08 AM EDT	Winter Weather Advisory	PHI	33 hr
Apr 2, 3:47 AM EDT	Mesoscale Discussion	SPC	6 hr
Apr 3, 3:32 PM EDT	Wind Advisory	PHI	28 hr
Apr 4, 12:01 AM EDT	Dense Fog Advisory	PHI	10 hr
Apr 4, 3:44 AM EDT	High Wind Warning	PHI	16 hr
Apr 15, 3:41 PM EDT	Flash Flood Watch	PHI	20 hr
Apr 16, 5:34 AM EDT	Areal Flood Advisory	PHI	4 hr
Apr 16, 6:30 AM EDT	Areal Flood Advisory	PHI	4 hr
Apr 16, 7:04 AM EDT	Flash Flood Warning	PHI	4 hr
Apr 16, 10:45 AM EDT	Areal Flood Warning	PHI	4 hr
Apr 16, 12:04 PM EDT	Special Weather Statement	PHI	26 min
Apr 17, 2:36 PM EDT	Freeze Warning	PHI	17 hr
Apr 19, 3:04 PM EDT	Freeze Warning	PHI	17 hr
Apr 20, 3:35 PM EDT	Frost Advisory	PHI	16 hr
Apr 20, 3:35 PM EDT	Freeze Warning	PHI	16 hr
Apr 28, 5:16 AM EDT	Dense Fog Advisory	PHI	4 hr
Apr 28, 3:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 28, 5:22 PM EDT	Special Weather Statement	PHI	23 min
Apr 28, 6:09 PM EDT	Special Weather Statement	PHI	36 min
Apr 28, 6:26 PM EDT	Special Weather Statement	PHI	49 min
May 2, 3:42 AM EDT	Red Flag Warning	PHI	17 hr
May 3, 6:03 PM EDT	Mesoscale Discussion	SPC	2 hr
May 4, 10:03 PM EDT	Special Weather Statement	PHI	27 min
May 4, 10:28 PM EDT	Special Weather Statement	PHI	62 min
May 10, 6:51 PM EDT	Severe Thunderstorm Warning	PHI	39 min
May 10, 7:54 PM EDT	Special Weather Statement	PHI	51 min
May 12, 3:59 PM EDT	Mesoscale Discussion	SPC	3 hr
May 12, 4:58 PM EDT	Tornado Watch	SPC	5 hr
May 12, 6:51 PM EDT	Special Weather Statement	PHI	39 min
May 12, 7:00 PM EDT	Severe Thunderstorm Warning	PHI	45 min
May 12, 7:10 PM EDT	Areal Flood Advisory	PHI	2 hr
May 12, 7:16 PM EDT	Severe Thunderstorm Warning	PHI	44 min
May 12, 7:16 PM EDT	Mesoscale Discussion	SPC	59 min
May 12, 7:30 PM EDT	Severe Thunderstorm Warning	PHI	45 min
May 12, 7:37 PM EDT	Areal Flood Advisory	PHI	2 hr
May 13, 9:38 PM EDT	Special Weather Statement	PHI	52 min
May 13, 10:17 PM EDT	Special Weather Statement	PHI	28 min
May 15, 3:40 AM EDT	Flash Flood Watch	PHI	21 hr
May 15, 1:46 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
May 15, 3:33 PM EDT	Mesoscale Discussion	SPC	117 min
May 15, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	64 min
May 15, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	63 min
May 15, 5:14 PM EDT	Areal Flood Advisory	PHI	2 hr
May 15, 5:22 PM EDT	Severe Thunderstorm Warning	PHI	38 min
May 15, 5:35 PM EDT	Areal Flood Advisory	PHI	4 hr
May 15, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	52 min
May 15, 6:15 PM EDT	Severe Thunderstorm Warning	PHI	60 min
May 15, 6:35 PM EDT	Severe Thunderstorm Warning	PHI	40 min
May 15, 6:58 PM EDT	Areal Flood Advisory	PHI	4 hr
May 16, 3:35 PM EDT	Flood Watch	PHI	3 days
May 17, 2:32 AM EDT	Areal Flood Advisory	PHI	4 hr
May 17, 5:16 AM EDT	Areal Flood Warning	PHI	6 hr
May 17, 6:01 AM EDT	River Flood Warning	PHI	7 hr
May 17, 10:04 AM EDT	River Flood Warning	PHI	8 hr
May 19, 9:27 PM EDT	Dense Fog Advisory	PHI	9 hr
May 26, 11:38 PM EDT	Flash Flood Watch	PHI	23 hr
May 27, 8:01 AM EDT	Flash Flood Warning	PHI	4 hr
May 27, 9:39 AM EDT	Areal Flood Advisory	PHI	2 hr
May 30, 4:43 AM EDT	Dense Fog Advisory	PHI	4 hr
Jun 2, 3:26 AM EDT	Flash Flood Watch	PHI	24 hr
Jun 2, 2:15 PM EDT	Areal Flood Advisory	PHI	3 hr
Jun 2, 5:11 PM EDT	Areal Flood Advisory	PHI	2 hr
Jun 2, 6:13 PM EDT	Special Weather Statement	PHI	47 min
Jun 2, 10:05 PM EDT	Special Weather Statement	PHI	40 min
Jun 2, 10:51 PM EDT	Special Weather Statement	PHI	54 min
Jun 2, 11:27 PM EDT	Areal Flood Advisory	PHI	2 hr
Jun 3, 6:16 PM EDT	Areal Flood Advisory	PHI	3 hr
Jun 5, 3:05 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 5, 6:02 PM EDT	Special Weather Statement	PHI	43 min
Jun 10, 3:48 AM EDT	Flash Flood Watch	PHI	28 hr
Jun 10, 8:29 PM EDT	Areal Flood Advisory	PHI	115 min
Jun 10, 9:52 PM EDT	Areal Flood Warning	PHI	18 hr
Jun 10, 10:38 PM EDT	Areal Flood Warning	PHI	20 hr
Jun 10, 11:33 PM EDT	Flash Flood Warning	PHI	5 hr
Jun 11, 1:16 AM EDT	Areal Flood Advisory	PHI	8 hr
Jun 11, 3:28 AM EDT	River Flood Warning	PHI	5 hr
Jun 17, 2:39 PM EDT	Heat Advisory	PHI	29 hr
Jun 18, 7:41 PM EDT	Severe Thunderstorm Warning	PHI	64 min
Jun 24, 6:16 PM EDT	Mesoscale Discussion	SPC	119 min
Jun 24, 6:36 PM EDT	Special Weather Statement	PHI	39 min
Jun 24, 7:08 PM EDT	Areal Flood Advisory	PHI	114 min
Jun 24, 7:10 PM EDT	Special Weather Statement	PHI	50 min
Jun 28, 4:52 AM EDT	Areal Flood Advisory	PHI	4 hr
Jun 29, 3:41 PM EDT	Excessive Heat Warning	PHI	4 days
Jun 29, 3:41 PM EDT	Heat Advisory	PHI	5 days
Jul 3, 6:15 PM EDT	Special Weather Statement	PHI	60 min
Jul 3, 6:40 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 3, 6:54 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Jul 3, 6:58 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 3, 7:06 PM EDT	Flash Flood Warning	PHI	2 hr
Jul 3, 7:22 PM EDT	Severe Thunderstorm Warning	PHI	21 min
Jul 3, 7:35 PM EDT	Special Weather Statement	PHI	25 min
Jul 3, 7:39 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Jul 3, 7:54 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 4, 6:32 PM EDT	Special Weather Statement	PHI	28 min
Jul 4, 7:18 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 5, 2:59 PM EDT	Flash Flood Watch	PHI	20 hr
Jul 6, 3:46 AM EDT	Areal Flood Advisory	PHI	5 hr
Jul 15, 10:57 AM EDT	Areal Flood Advisory	PHI	2 hr
Jul 17, 1:49 PM EDT	Special Weather Statement	PHI	41 min
Jul 17, 2:05 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 17, 2:21 PM EDT	Special Weather Statement	PHI	39 min
Jul 17, 2:27 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 17, 2:50 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 20, 2:44 PM EDT	Flash Flood Watch	PHI	34 hr
Jul 22, 4:44 PM EDT	Special Weather Statement	PHI	31 min
Jul 22, 5:07 PM EDT	Special Weather Statement	PHI	38 min
Jul 22, 5:30 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 22, 8:18 PM EDT	Areal Flood Warning	PHI	117 min
Jul 22, 8:43 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 22, 8:54 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 23, 12:19 AM EDT	River Flood Warning	PHI	5 hr
Jul 23, 3:45 AM EDT	Flash Flood Watch	PHI	68 hr
Jul 23, 7:00 AM EDT	River Flood Warning	PHI	9 hr
Jul 23, 12:58 PM EDT	Special Weather Statement	PHI	32 min
Jul 23, 1:01 PM EDT	Areal Flood Advisory	PHI	34 min
Jul 23, 2:40 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 24, 12:56 AM EDT	Areal Flood Advisory	PHI	4 hr
Jul 24, 1:34 AM EDT	Flash Flood Warning	PHI	8 hr
Jul 24, 4:56 AM EDT	Areal Flood Advisory	PHI	4 hr
Jul 24, 10:03 AM EDT	Areal Flood Advisory	PHI	2 hr
Jul 24, 12:50 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 24, 1:02 PM EDT	Special Weather Statement	PHI	28 min
Jul 24, 1:24 PM EDT	Special Weather Statement	PHI	36 min
Jul 24, 1:40 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 25, 4:34 PM EDT	Areal Flood Advisory	PHI	2 hr
Jul 25, 5:43 PM EDT	Special Weather Statement	PHI	32 min
Jul 25, 6:17 PM EDT	Special Weather Statement	PHI	43 min
Jul 25, 8:24 PM EDT	Areal Flood Advisory	PHI	2 hr
Jul 27, 9:50 AM EDT	Flash Flood Watch	PHI	13 hr
Jul 27, 12:59 PM EDT	Mesoscale Discussion	SPC	91 min
Jul 27, 1:17 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 27, 4:50 PM EDT	Mesoscale Discussion	SPC	55 min
Jul 27, 6:03 PM EDT	Severe Thunderstorm Warning	PHI	42 min
Jul 27, 6:06 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 27, 7:06 PM EDT	Mesoscale Discussion	SPC	54 min
Jul 27, 7:09 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Jul 27, 7:37 PM EDT	Areal Flood Advisory	PHI	116 min
Aug 1, 11:35 PM EDT	Severe Thunderstorm Warning	PHI	20 min
Aug 2, 11:46 AM EDT	Mesoscale Discussion	SPC	119 min
Aug 4, 1:59 AM EDT	Areal Flood Advisory	PHI	4 hr
Aug 4, 5:45 AM EDT	Areal Flood Advisory	PHI	7 hr
Aug 4, 6:45 AM EDT	River Flood Warning	PHI	4 hr
Aug 4, 8:48 AM EDT	Areal Flood Warning	PHI	4 hr
Aug 4, 11:55 AM EDT	River Flood Warning	PHI	12 hr
Aug 5, 3:05 PM EDT	Heat Advisory	PHI	27 hr
Aug 7, 12:19 PM EDT	Heat Advisory	PHI	6 hr
Aug 7, 3:31 PM EDT	Heat Advisory	PHI	26 hr
Aug 8, 3:02 PM EDT	Special Weather Statement	PHI	43 min
Aug 8, 3:40 PM EDT	Special Weather Statement	PHI	35 min
Aug 11, 3:24 AM EDT	Flash Flood Watch	PHI	20 hr
Aug 11, 12:16 PM EDT	Special Weather Statement	PHI	29 min
Aug 11, 12:48 PM EDT	Areal Flood Advisory	PHI	3 hr
Aug 11, 1:20 PM EDT	Areal Flood Advisory	PHI	3 hr
Aug 11, 1:33 PM EDT	Flash Flood Warning	PHI	4 hr
Aug 11, 1:40 PM EDT	Flash Flood Warning	PHI	4 hr
Aug 11, 1:51 PM EDT	Severe Thunderstorm Warning	PHI	39 min
Aug 11, 4:19 PM EDT	Areal Flood Advisory	PHI	3 hr
Aug 11, 4:19 PM EDT	Severe Thunderstorm Warning	PHI	29 min
Aug 11, 5:58 PM EDT	Areal Flood Advisory	PHI	5 hr
Aug 11, 6:13 PM EDT	Special Weather Statement	PHI	32 min
Aug 12, 10:08 PM EDT	Flash Flood Watch	PHI	24 hr
Aug 13, 5:12 AM EDT	Areal Flood Advisory	PHI	103 min
Aug 13, 6:24 AM EDT	Areal Flood Advisory	PHI	4 hr
Aug 13, 6:50 AM EDT	Flash Flood Warning	PHI	6 hr
Aug 13, 9:21 AM EDT	River Flood Warning	PHI	10 hr
Aug 13, 11:05 AM EDT	River Flood Warning	PHI	30 hr
Aug 13, 12:14 PM EDT	River Flood Warning	PHI	52 hr
Aug 13, 12:37 PM EDT	Areal Flood Warning	PHI	18 hr
Aug 13, 7:42 PM EDT	Severe Thunderstorm Warning	PHI	48 min
Aug 13, 8:16 PM EDT	Areal Flood Advisory	PHI	3 hr
Aug 17, 7:09 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Aug 18, 12:56 AM EDT	Areal Flood Advisory	PHI	4 hr
Aug 18, 3:16 AM EDT	Flash Flood Watch	PHI	20 hr
Aug 18, 3:20 PM EDT	Special Weather Statement	PHI	40 min
Aug 19, 10:00 AM EDT	Areal Flood Advisory	PHI	110 min
Aug 19, 2:05 PM EDT	Areal Flood Advisory	PHI	8 hr
Aug 21, 7:06 PM EDT	Mesoscale Discussion	SPC	84 min
Aug 21, 8:53 PM EDT	Areal Flood Advisory	PHI	5 hr
Aug 21, 10:16 PM EDT	Flash Flood Warning	PHI	7 hr
Aug 21, 11:18 PM EDT	Areal Flood Advisory	PHI	3 hr
Aug 22, 5:14 AM EDT	Areal Flood Warning	PHI	4 hr
Aug 22, 10:04 AM EDT	River Flood Warning	PHI	5 hr
Aug 27, 2:58 AM EDT	Heat Advisory	PHI	65 hr
Aug 31, 10:14 AM EDT	Areal Flood Advisory	PHI	3 hr
Aug 31, 1:54 PM EDT	Areal Flood Advisory	PHI	4 hr
Aug 31, 3:59 PM EDT	Flash Flood Warning	PHI	4 hr
Aug 31, 8:00 PM EDT	Areal Flood Warning	PHI	4 hr
Sep 3, 3:02 AM EDT	Heat Advisory	PHI	4 days
Sep 8, 3:34 AM EDT	Flood Watch	PHI	60 hr
Sep 8, 4:29 AM EDT	Areal Flood Advisory	PHI	4 hr
Sep 8, 8:15 AM EDT	Areal Flood Advisory	PHI	119 min
Sep 12, 2:05 AM EDT	Dense Fog Advisory	PHI	8 hr
Sep 12, 4:36 PM EDT	Areal Flood Advisory	PHI	3 hr
Sep 17, 2:45 PM EDT	Special Weather Statement	PHI	45 min
Sep 18, 1:13 AM EDT	Special Weather Statement	PHI	62 min
Sep 18, 2:09 AM EDT	Special Weather Statement	PHI	81 min
Sep 18, 2:38 AM EDT	Areal Flood Advisory	PHI	4 hr
Sep 18, 9:27 AM EDT	Flash Flood Watch	PHI	6 hr
Sep 18, 10:57 AM EDT	Areal Flood Advisory	PHI	3 hr
Sep 18, 12:36 PM EDT	Areal Flood Advisory	PHI	3 hr
Sep 25, 2:59 PM EDT	Areal Flood Advisory	PHI	4 hr
Sep 26, 3:40 PM EDT	Mesoscale Discussion	SPC	3 hr
Sep 26, 5:02 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Sep 26, 6:37 PM EDT	Special Weather Statement	PHI	53 min
Sep 26, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	54 min
Sep 26, 7:31 PM EDT	Areal Flood Advisory	PHI	106 min
Sep 26, 7:53 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Sep 27, 3:24 AM EDT	Flood Watch	PHI	27 hr
Sep 28, 1:44 AM EDT	Areal Flood Advisory	PHI	5 hr
Sep 28, 3:13 AM EDT	Areal Flood Warning	PHI	4 hr
Sep 28, 4:59 AM EDT	River Flood Warning	PHI	7 hr
Sep 28, 7:33 AM EDT	Areal Flood Warning	PHI	5 hr
Sep 28, 8:28 AM EDT	River Flood Warning	PHI	13 hr
Sep 28, 8:33 AM EDT	River Flood Warning	PHI	7 hr
Oct 2, 9:51 PM EDT	Special Weather Statement	PHI	114 min
Oct 10, 3:16 PM EDT	Flash Flood Watch	PHI	38 hr
Oct 11, 8:27 PM EDT	Areal Flood Advisory	PHI	8 hr
Oct 11, 9:43 PM EDT	Areal Flood Advisory	PHI	8 hr
Oct 12, 2:55 AM EDT	Areal Flood Advisory	PHI	2 hr
Oct 17, 3:32 PM EDT	Freeze Watch	PHI	12 hr
Oct 18, 3:05 AM EDT	Frost Advisory	PHI	30 hr
Oct 20, 10:31 PM EDT	Special Weather Statement	PHI	29 min
Oct 21, 3:07 AM EDT	Frost Advisory	PHI	30 hr
Oct 21, 3:18 PM EDT	Freeze Warning	PHI	18 hr
Oct 24, 3:12 PM EDT	Frost Advisory	PHI	18 hr
Nov 2, 9:28 PM EDT	Areal Flood Advisory	PHI	4 hr
Nov 2, 9:48 PM EDT	Special Weather Statement	PHI	27 min
Nov 2, 10:09 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Nov 2, 10:32 PM EDT	Tornado Warning	PHI	28 min
Nov 2, 10:45 PM EDT	Areal Flood Warning	PHI	13 hr
Nov 2, 10:47 PM EDT	Tornado Warning	PHI	43 min
Nov 2, 10:53 PM EDT	Flash Flood Warning	PHI	4 hr
Nov 2, 10:53 PM EDT	Severe Thunderstorm Warning	PHI	67 min
Nov 2, 11:23 PM EDT	Tornado Warning	PHI	24 min
Nov 2, 11:25 PM EDT	Areal Flood Advisory	PHI	4 hr
Nov 3, 2:03 AM EDT	River Flood Warning	PHI	6 hr
Nov 3, 2:40 AM EDT	River Flood Warning	PHI	15 hr
Nov 3, 3:21 AM EDT	Areal Flood Warning	PHI	4 hr
Nov 3, 5:00 AM EDT	River Flood Warning	PHI	6 hr
Nov 3, 7:01 AM EDT	Areal Flood Warning	PHI	5 hr
Nov 3, 11:44 AM EDT	Areal Flood Warning	PHI	8 hr
Nov 6, 11:47 AM EST	Areal Flood Advisory	PHI	2 hr
Nov 14, 3:31 PM EST	Winter Weather Advisory	PHI	29 hr
Nov 15, 9:56 AM EST	Mesoscale Discussion	SPC	6 hr
Nov 15, 12:21 PM EST	Winter Storm Warning	PHI	21 hr
Nov 24, 5:52 PM EST	Areal Flood Advisory	PHI	6 hr
Nov 24, 9:57 PM EST	River Flood Warning	PHI	8 hr
Nov 24, 10:15 PM EST	Areal Flood Warning	PHI	6 hr
Nov 24, 11:36 PM EST	Areal Flood Warning	PHI	6 hr
Nov 25, 12:16 AM EST	River Flood Warning	PHI	15 hr
Nov 25, 2:54 AM EST	River Flood Warning	PHI	21 hr
Nov 25, 3:35 PM EST	Flood Watch	PHI	27 hr
Nov 27, 3:13 PM EST	Wind Advisory	PHI	27 hr
Dec 2, 8:24 AM EST	Dense Fog Advisory	PHI	21 hr
Dec 14, 7:44 AM EST	Dense Fog Advisory	PHI	3 hr
Dec 16, 7:25 AM EST	River Flood Warning	PHI	96 min
Dec 16, 12:28 PM EST	Areal Flood Advisory	PHI	4 hr
Dec 16, 3:41 PM EST	Areal Flood Warning	PHI	4 hr
Dec 18, 3:16 PM EST	Flood Watch	PHI	3 days
Dec 21, 3:44 AM EST	River Flood Warning	PHI	9 hr
Dec 21, 4:02 AM EST	Areal Flood Warning	PHI	4 hr
Dec 21, 5:20 AM EST	River Flood Warning	PHI	14 hr
Dec 21, 8:04 AM EST	Areal Flood Warning	PHI	7 hr
Dec 27, 3:13 PM EST	Flood Watch	PHI	28 hr
Dec 28, 11:23 AM EST	Areal Flood Advisory	PHI	8 hr
Dec 28, 8:57 PM EST	Dense Fog Advisory	PHI	9 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	25
Tornado Warning	3
Severe Thunderstorm Watch	3
Tornado Watch	1
Mesoscale Discussion	19
Special Weather Statement	43
Flooding
Areal Flood Warning	20
Flash Flood Warning	16
River Flood Warning	23
Flash Flood Watch	14
Flood Watch	7
Areal Flood Advisory	75
Winter
Winter Storm Warning	3
Winter Storm Watch	3
Winter Weather Advisory	9
Heat
Excessive Heat Warning	1
Heat Advisory	7
Cold
Freeze Warning	4
Freeze Watch	1
Frost Advisory	4
Wind Chill Advisory	1
Wind and dust
High Wind Warning	2
High Wind Watch	1
Wind Advisory	3
Fire
Red Flag Warning	1
Fog and smoke
Dense Fog Advisory	12

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2017 2019

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.