Alert archive / Delaware / Sussex County

Weather alerts in Sussex County, Delaware, 2018

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

Sussex County and its neighbors

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

Alerts: 225
Warnings: 44
Watches: 22
Advisories: 87
Busiest month: September33 alerts
Busiest day: June 9, 201815 alerts

Over time

By month

Warning verification

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

Sussex County, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	9	5	44%	3	67%	30 min
Flash flood warnings	14	5	64%	8	88%	66 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 2, 3:07 AM EST	Winter Storm Watch	PHI	33 hr
Jan 3, 4:03 AM EST	Winter Storm Warning	PHI	38 hr
Jan 3, 12:17 PM EST	Coastal Flood Advisory	PHI	26 hr
Jan 3, 3:17 PM EST	Blizzard Warning	PHI	27 hr
Jan 4, 3:48 AM EST	Wind Chill Advisory	PHI	3 days
Jan 4, 6:06 AM EST	Mesoscale Discussion	SPC	6 hr
Jan 7, 2:50 PM EST	Winter Weather Advisory	PHI	33 hr
Jan 11, 2:34 PM EST	Wind Advisory	PHI	13 hr
Jan 23, 10:59 AM EST	Areal Flood Advisory	PHI	4 hr
Jan 23, 2:16 PM EST	Special Weather Statement	PHI	29 min
Jan 29, 3:13 PM EST	Coastal Flood Advisory	PHI	21 hr
Feb 11, 2:27 AM EST	Areal Flood Advisory	PHI	4 hr
Feb 11, 5:07 AM EST	Areal Flood Advisory	PHI	4 hr
Feb 11, 3:52 PM EST	Mesoscale Discussion	SPC	2 hr
Feb 19, 11:00 PM EST	Dense Fog Advisory	PHI	11 hr
Feb 25, 5:31 AM EST	Dense Fog Advisory	PHI	6 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
Feb 28, 3:43 PM EST	Coastal Flood 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 1, 4:07 PM EST	Coastal Flood Warning	PHI	58 hr
Mar 3, 3:37 PM EST	Coastal Flood Advisory	PHI	19 hr
Mar 4, 9:56 AM EST	Coastal Flood Warning	PHI	5 hr
Mar 4, 2:57 PM EST	Coastal Flood Advisory	PHI	23 hr
Mar 5, 3:10 PM EST	Coastal Flood Advisory	PHI	12 hr
Mar 6, 2:30 PM EST	Coastal Flood Advisory	PHI	37 hr
Mar 19, 3:28 PM EDT	Coastal Flood Watch	PHI	11 hr
Mar 19, 3:36 PM EDT	Winter Storm Watch	PHI	13 hr
Mar 19, 8:38 PM EDT	Wind Advisory	PHI	21 hr
Mar 20, 2:40 AM EDT	Coastal Flood Warning	PHI	50 hr
Mar 20, 4:41 AM EDT	Winter Storm Warning	PHI	47 hr
Apr 3, 3:32 PM EDT	Wind Advisory	PHI	28 hr
Apr 4, 1:27 PM EDT	Mesoscale Discussion	SPC	3 hr
Apr 4, 2:17 PM EDT	Special Weather Statement	PHI	43 min
Apr 15, 6:08 AM EDT	Coastal Flood Advisory	PHI	39 hr
Apr 15, 2:44 PM EDT	Coastal Flood Warning	PHI	23 hr
Apr 16, 6:04 AM EDT	Special Weather Statement	PHI	26 min
Apr 20, 3:35 PM EDT	Frost Advisory	PHI	16 hr
Apr 25, 12:30 PM EDT	Dense Fog Advisory	PHI	12 hr
Apr 25, 7:28 PM EDT	Areal Flood Advisory	PHI	5 hr
Apr 29, 3:32 PM EDT	Fire Weather Watch	PHI	12 hr
Apr 30, 3:31 AM EDT	Red Flag Warning	PHI	16 hr
May 12, 4:58 PM EDT	Tornado Watch	SPC	5 hr
May 12, 7:16 PM EDT	Mesoscale Discussion	SPC	59 min
May 12, 8:51 PM EDT	Severe Thunderstorm Warning	PHI	39 min
May 12, 9:14 PM EDT	Mesoscale Discussion	SPC	61 min
May 12, 9:27 PM EDT	Severe Thunderstorm Warning	PHI	63 min
May 12, 10:28 PM EDT	Areal Flood Advisory	PHI	65 min
May 13, 11:20 PM EDT	Special Weather Statement	PHI	55 min
May 14, 12:07 AM EDT	Special Weather Statement	PHI	53 min
May 14, 12:55 AM EDT	Areal Flood Advisory	PHI	114 min
May 14, 8:45 PM EDT	Special Weather Statement	PHI	30 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, 8:41 PM EDT	Mesoscale Discussion	SPC	94 min
May 15, 8:43 PM EDT	Areal Flood Advisory	PHI	4 hr
May 15, 10:01 PM EDT	Areal Flood Advisory	PHI	4 hr
May 15, 10:54 PM EDT	Special Weather Statement	PHI	66 min
May 16, 3:35 PM EDT	Flood Watch	PHI	3 days
May 18, 4:04 AM EDT	Coastal Flood Advisory	PHI	27 hr
May 18, 5:44 AM EDT	Areal Flood Advisory	PHI	3 hr
May 18, 8:34 AM EDT	Areal Flood Advisory	PHI	10 hr
May 19, 5:12 AM EDT	Areal Flood Advisory	PHI	3 hr
May 19, 7:52 AM EDT	Areal Flood Advisory	PHI	2 hr
May 19, 1:50 PM EDT	Areal Flood Advisory	PHI	4 hr
May 19, 4:17 PM EDT	Special Weather Statement	PHI	43 min
May 22, 7:41 PM EDT	Special Weather Statement	PHI	34 min
May 26, 11:38 PM EDT	Flash Flood Watch	PHI	23 hr
May 27, 1:31 AM EDT	Special Weather Statement	PHI	44 min
May 27, 6:18 PM EDT	Areal Flood Advisory	PHI	3 hr
May 27, 7:46 PM EDT	Areal Flood Advisory	PHI	4 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, 1:36 PM EDT	Special Weather Statement	PHI	24 min
Jun 2, 8:56 PM EDT	Rip Current Statement	PHI	47 hr
Jun 3, 10:02 AM EDT	Wind Advisory	PHI	6 hr
Jun 3, 11:40 AM EDT	Areal Flood Advisory	PHI	4 hr
Jun 3, 10:12 PM EDT	Coastal Flood Advisory	PHI	5 hr
Jun 9, 12:51 PM EDT	Special Weather Statement	PHI	24 min
Jun 9, 1:25 PM EDT	Flash Flood Warning	PHI	4 hr
Jun 9, 1:34 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 9, 1:35 PM EDT	Special Weather Statement	PHI	25 min
Jun 9, 2:00 PM EDT	Special Weather Statement	PHI	30 min
Jun 9, 2:24 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Jun 9, 2:42 PM EDT	Areal Flood Advisory	PHI	58 min
Jun 9, 2:48 PM EDT	Severe Thunderstorm Warning	PHI	42 min
Jun 9, 2:53 PM EDT	Flash Flood Warning	PHI	4 hr
Jun 9, 3:26 PM EDT	Special Weather Statement	PHI	34 min
Jun 9, 4:06 PM EDT	Special Weather Statement	PHI	39 min
Jun 9, 4:15 PM EDT	Flash Flood Warning	PHI	3 hr
Jun 9, 5:31 PM EDT	Special Weather Statement	PHI	44 min
Jun 9, 5:44 PM EDT	Areal Flood Warning	PHI	4 hr
Jun 9, 6:44 PM EDT	Areal Flood Warning	PHI	3 hr
Jun 10, 3:48 AM EDT	Flash Flood Watch	PHI	28 hr
Jun 10, 4:45 PM EDT	Special Weather Statement	PHI	30 min
Jun 10, 5:00 PM EDT	Flash Flood Warning	PHI	108 min
Jun 10, 8:13 PM EDT	Special Weather Statement	PHI	47 min
Jun 10, 9:07 PM EDT	Areal Flood Advisory	PHI	3 hr
Jun 11, 3:16 AM EDT	Areal Flood Advisory	PHI	8 hr
Jun 15, 3:45 PM EDT	Coastal Flood Advisory	PHI	10 hr
Jun 23, 1:38 PM EDT	Mesoscale Discussion	SPC	67 min
Jun 23, 8:34 PM EDT	Areal Flood Advisory	PHI	80 min
Jun 24, 8:30 PM EDT	Severe Thunderstorm Warning	PHI	45 min
Jun 29, 3:41 PM EDT	Heat Advisory	PHI	5 days
Jul 5, 2:18 PM EDT	Special Weather Statement	PHI	42 min
Jul 6, 10:29 AM EDT	Special Weather Statement	PHI	31 min
Jul 6, 10:52 AM EDT	Areal Flood Advisory	PHI	4 hr
Jul 6, 10:56 AM EDT	Special Weather Statement	PHI	64 min
Jul 6, 12:01 PM EDT	Special Weather Statement	PHI	44 min
Jul 6, 1:11 PM EDT	Special Weather Statement	PHI	34 min
Jul 6, 3:11 PM EDT	Special Weather Statement	PHI	34 min
Jul 7, 10:38 AM EDT	Rip Current Statement	PHI	10 hr
Jul 17, 5:44 PM EDT	Special Weather Statement	PHI	31 min
Jul 20, 2:44 PM EDT	Flash Flood Watch	PHI	34 hr
Jul 20, 8:52 PM EDT	Rip Current Statement	PHI	48 hr
Jul 21, 3:03 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 22, 9:44 PM EDT	Rip Current Statement	PHI	23 hr
Jul 23, 2:57 AM EDT	Mesoscale Discussion	SPC	3 hr
Jul 23, 10:50 AM EDT	Areal Flood Advisory	PHI	110 min
Jul 23, 2:40 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 23, 9:14 PM EDT	Rip Current Statement	PHI	48 hr
Jul 24, 12:45 PM EDT	Special Weather Statement	PHI	30 min
Jul 25, 3:16 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 27, 1:17 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 27, 2:15 PM EDT	Areal Flood Advisory	PHI	6 hr
Jul 27, 4:19 PM EDT	Special Weather Statement	PHI	41 min
Jul 27, 5:09 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 27, 7:06 PM EDT	Mesoscale Discussion	SPC	54 min
Jul 28, 6:25 PM EDT	Special Weather Statement	PHI	50 min
Jul 31, 5:48 PM EDT	Special Weather Statement	PHI	27 min
Jul 31, 9:04 PM EDT	Areal Flood Advisory	PHI	117 min
Aug 3, 3:29 PM EDT	Special Weather Statement	PHI	46 min
Aug 7, 2:13 PM EDT	Special Weather Statement	PHI	47 min
Aug 11, 4:26 AM EDT	Coastal Flood Advisory	PHI	24 hr
Aug 11, 1:23 PM EDT	Severe Thunderstorm Warning	PHI	37 min
Aug 11, 8:57 PM EDT	Flash Flood Warning	PHI	3 hr
Aug 12, 5:28 AM EDT	Coastal Flood Advisory	PHI	24 hr
Aug 19, 1:11 AM EDT	Areal Flood Advisory	PHI	3 hr
Aug 20, 3:38 AM EDT	Areal Flood Advisory	PHI	2 hr
Aug 21, 8:05 PM EDT	Special Weather Statement	PHI	40 min
Aug 27, 2:58 AM EDT	Heat Advisory	PHI	65 hr
Aug 31, 1:37 AM EDT	Special Weather Statement	PHI	53 min
Aug 31, 12:15 PM EDT	Flash Flood Warning	PHI	7 hr
Aug 31, 12:35 PM EDT	Severe Thunderstorm Warning	PHI	40 min
Aug 31, 12:54 PM EDT	Flash Flood Warning	PHI	4 hr
Aug 31, 1:09 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Aug 31, 1:58 PM EDT	Special Weather Statement	PHI	32 min
Aug 31, 4:27 PM EDT	Special Weather Statement	PHI	18 min
Aug 31, 4:32 PM EDT	Flash Flood Warning	PHI	4 hr
Aug 31, 4:42 PM EDT	Special Weather Statement	PHI	33 min
Aug 31, 5:14 PM EDT	Special Weather Statement	PHI	46 min
Aug 31, 5:38 PM EDT	Areal Flood Advisory	PHI	4 hr
Aug 31, 5:48 PM EDT	Flash Flood Warning	PHI	3 hr
Aug 31, 7:11 PM EDT	Areal Flood Warning	PHI	4 hr
Aug 31, 8:28 PM EDT	Areal Flood Warning	PHI	3 hr
Sep 1, 4:30 AM EDT	Areal Flood Advisory	PHI	4 hr
Sep 1, 5:36 AM EDT	Flash Flood Warning	PHI	4 hr
Sep 1, 4:03 PM EDT	Areal Flood Advisory	PHI	3 hr
Sep 3, 4:22 PM EDT	Areal Flood Advisory	PHI	31 min
Sep 3, 4:48 PM EDT	Flash Flood Warning	PHI	2 hr
Sep 7, 1:01 PM EDT	Special Weather Statement	PHI	44 min
Sep 7, 1:45 PM EDT	Special Weather Statement	PHI	30 min
Sep 7, 2:01 PM EDT	Areal Flood Advisory	PHI	2 hr
Sep 7, 2:49 PM EDT	Special Weather Statement	PHI	41 min
Sep 7, 4:12 PM EDT	Areal Flood Advisory	PHI	94 min
Sep 7, 11:19 PM EDT	Rip Current Statement	PHI	9 days
Sep 7, 11:40 PM EDT	Special Weather Statement	PHI	35 min
Sep 8, 12:11 AM EDT	Flash Flood Warning	PHI	4 hr
Sep 8, 5:31 AM EDT	Coastal Flood Advisory	PHI	21 hr
Sep 8, 11:54 AM EDT	Special Weather Statement	PHI	21 min
Sep 8, 4:49 PM EDT	Coastal Flood Watch	PHI	7 hr
Sep 8, 4:49 PM EDT	Coastal Flood Warning	PHI	6 hr
Sep 8, 4:49 PM EDT	High Surf Advisory	PHI	60 hr
Sep 9, 12:05 AM EDT	Coastal Flood Warning	PHI	54 hr
Sep 9, 5:04 AM EDT	Coastal Flood Watch	PHI	11 hr
Sep 10, 5:02 AM EDT	Coastal Flood Watch	PHI	11 hr
Sep 10, 5:02 AM EDT	Coastal Flood Advisory	PHI	21 hr
Sep 10, 4:08 PM EDT	Coastal Flood Warning	PHI	10 hr
Sep 11, 4:40 AM EDT	Coastal Flood Advisory	PHI	10 hr
Sep 11, 2:25 PM EDT	Flash Flood Warning	PHI	2 hr
Sep 12, 2:05 AM EDT	Dense Fog Advisory	PHI	8 hr
Sep 12, 3:41 PM EDT	Dense Fog Advisory	PHI	14 hr
Sep 12, 3:50 PM EDT	High Surf Advisory	PHI	52 hr
Sep 18, 5:26 PM EDT	Special Weather Statement	PHI	34 min
Sep 23, 9:00 PM EDT	Rip Current Statement	PHI	24 hr
Sep 24, 4:27 AM EDT	Coastal Flood Advisory	PHI	42 hr
Sep 25, 12:33 PM EDT	Rip Current Statement	PHI	8 hr
Oct 5, 3:25 PM EDT	Coastal Flood Advisory	PHI	5 hr
Oct 10, 3:16 PM EDT	Flash Flood Watch	PHI	38 hr
Oct 11, 3:24 AM EDT	Wind Advisory	PHI	31 hr
Oct 11, 11:47 PM EDT	Flash Flood Warning	PHI	4 hr
Oct 11, 11:54 PM EDT	High Wind Warning	PHI	9 hr
Oct 12, 3:28 AM EDT	Areal Flood Warning	PHI	6 hr
Oct 12, 11:42 AM EDT	Coastal Flood Advisory	PHI	4 hr
Oct 16, 12:18 AM EDT	Mesoscale Discussion	SPC	117 min
Oct 16, 1:05 AM EDT	Special Weather Statement	PHI	40 min
Oct 18, 3:05 AM EDT	Frost Advisory	PHI	30 hr
Oct 20, 3:40 PM EDT	Wind Advisory	PHI	19 hr
Oct 20, 11:16 PM EDT	Special Weather Statement	PHI	59 min
Oct 24, 3:12 PM EDT	Frost Advisory	PHI	18 hr
Oct 25, 3:27 PM EDT	Coastal Flood Watch	PHI	24 hr
Oct 25, 3:58 PM EDT	Wind Advisory	PHI	44 hr
Oct 26, 3:34 AM EDT	Coastal Flood Warning	PHI	35 hr
Nov 2, 6:55 PM EDT	Mesoscale Discussion	SPC	95 min
Nov 3, 12:50 AM EDT	Special Weather Statement	PHI	25 min
Nov 5, 1:55 PM EST	Areal Flood Advisory	PHI	4 hr
Nov 6, 12:11 PM EST	Mesoscale Discussion	SPC	94 min
Nov 6, 1:30 PM EST	Special Weather Statement	PHI	60 min
Nov 6, 1:48 PM EST	Severe Thunderstorm Warning	PHI	42 min
Nov 6, 2:25 PM EST	Special Weather Statement	PHI	65 min
Nov 9, 3:23 AM EST	Coastal Flood Advisory	PHI	11 hr
Nov 9, 4:54 PM EST	Areal Flood Advisory	PHI	112 min
Nov 9, 5:46 PM EST	Areal Flood Warning	PHI	69 min
Nov 14, 3:23 PM EST	Wind Advisory	PHI	39 hr
Nov 15, 2:45 AM EST	Flood Watch	PHI	13 hr
Nov 24, 11:01 PM EST	Wind Advisory	PHI	5 hr
Nov 25, 9:39 AM EST	Coastal Flood Advisory	PHI	5 hr
Nov 25, 3:25 PM EST	Coastal Flood Advisory	PHI	34 hr
Nov 27, 3:13 PM EST	Wind Advisory	PHI	27 hr
Dec 16, 12:59 AM EST	Special Weather Statement	PHI	46 min
Dec 18, 3:16 PM EST	Flood Watch	PHI	3 days
Dec 19, 3:24 PM EST	Wind Advisory	PHI	39 hr
Dec 20, 3:39 PM EST	Coastal Flood Advisory	PHI	22 hr
Dec 21, 4:43 AM EST	Areal Flood Warning	PHI	8 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	9
Severe Thunderstorm Watch	2
Tornado Watch	1
Mesoscale Discussion	14
Special Weather Statement	50
Flooding
Areal Flood Warning	7
Flash Flood Warning	14
Flash Flood Watch	6
Flood Watch	3
Areal Flood Advisory	37
Winter
Blizzard Warning	1
Winter Storm Warning	2
Winter Storm Watch	2
Winter Weather Advisory	1
Heat
Heat Advisory	2
Cold
Frost Advisory	3
Wind Chill Advisory	1
Wind and dust
High Wind Warning	2
High Wind Watch	1
Wind Advisory	12
Fire
Red Flag Warning	1
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	7
Coast and beach
Coastal Flood Warning	8
Coastal Flood Watch	6
Coastal Flood Advisory	22
High Surf Advisory	2
Rip Current Statement	8

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.