Alert archive / Delaware / New Castle County

Weather alerts in New Castle County, Delaware, 2025

179 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

New Castle County and its neighbors

Each county as a circle sized by its count in 2025. Tap one for its archive.

Alerts: 179
Warnings: 61
Watches: 29
Advisories: 50
Busiest month: July57 alerts
Busiest day: June 19, 202511 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 New Castle County in 2025 had a tornado report inside them.

New Castle County, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	0	100%	0
Severe thunderstorm warnings	30	18	40%	19	74%	18 min
Flash flood warnings	17	10	41%	12	100%	73 min

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Philadelphia/Mount Holly: tornado warnings	29	1	97%	5	20%	0 min
NWS Philadelphia/Mount Holly: severe thunderstorm warnings	233	131	44%	502	91%	23 min
NWS Philadelphia/Mount Holly: flash flood warnings	96	55	43%	203	96%	67 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
Dec 31, 7:15 PM EST	Severe Thunderstorm Warning	PHI	22 min
Jan 1, 2:28 AM EST	Dense Fog Advisory	PHI	3 hr
Jan 2, 2:44 PM EST	Winter Weather Advisory	PHI	31 hr
Jan 4, 2:09 AM EST	Winter Storm Watch	PHI	24 hr
Jan 5, 2:05 AM EST	Winter Storm Warning	PHI	47 hr
Jan 18, 2:49 PM EST	Winter Weather Advisory	PHI	33 hr
Jan 19, 3:51 PM EST	Cold Weather Advisory	PHI	68 hr
Jan 28, 1:18 PM EST	Wind Advisory	PHI	29 hr
Feb 4, 2:06 PM EST	Winter Weather Advisory	PHI	48 hr
Feb 6, 4:00 AM EST	Mesoscale Discussion	SPC	5 hr
Feb 6, 9:12 PM EST	Dense Fog Advisory	PHI	5 hr
Feb 7, 1:01 PM EST	Winter Weather Advisory	PHI	38 hr
Feb 8, 6:24 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 9, 3:00 PM EST	Winter Storm Watch	PHI	24 hr
Feb 10, 3:01 PM EST	Winter Weather Advisory	PHI	37 hr
Feb 11, 2:49 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 13, 9:23 AM EST	Dense Fog Advisory	PHI	3 hr
Feb 13, 4:35 PM EST	Wind Advisory	PHI	5 hr
Feb 15, 2:57 AM EST	High Wind Watch	PHI	11 hr
Feb 15, 2:17 PM EST	High Wind Warning	PHI	49 hr
Feb 17, 2:41 AM EST	Wind Advisory	PHI	12 hr
Feb 28, 1:04 PM EST	Fire Weather Watch	PHI	14 hr
Mar 1, 3:13 AM EST	Red Flag Warning	PHI	17 hr
Mar 1, 4:28 PM EST	Wind Advisory	PHI	5 hr
Mar 6, 1:38 AM EST	Wind Advisory	PHI	38 hr
Mar 16, 10:03 AM EDT	Wind Advisory	PHI	13 hr
Mar 31, 8:56 PM EDT	Severe Thunderstorm Warning	PHI	49 min
Apr 4, 3:52 AM EDT	Mesoscale Discussion	SPC	53 min
Apr 4, 4:40 AM EDT	Severe Thunderstorm Warning	PHI	50 min
Apr 15, 1:09 PM EDT	Wind Advisory	PHI	7 hr
Apr 16, 9:40 AM EDT	Frost Advisory	PHI	21 hr
Apr 19, 10:43 PM EDT	Mesoscale Discussion	SPC	92 min
Apr 26, 2:05 PM EDT	Mesoscale Discussion	SPC	115 min
May 3, 5:51 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
May 3, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	44 min
May 3, 7:32 PM EDT	Flash Flood Warning	PHI	3 hr
May 6, 12:01 PM EDT	Mesoscale Discussion	SPC	119 min
May 12, 5:36 PM EDT	Coastal Flood Advisory	PHI	36 hr
May 15, 9:34 PM EDT	Dense Fog Advisory	PHI	12 hr
May 16, 9:46 AM EDT	Mesoscale Discussion	SPC	119 min
May 16, 10:06 AM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 16, 11:16 AM EDT	Severe Thunderstorm Warning	PHI	59 min
May 16, 11:32 AM EDT	Flash Flood Warning	PHI	4 hr
May 16, 12:11 PM EDT	Mesoscale Discussion	SPC	2 hr
May 16, 12:20 PM EDT	Severe Thunderstorm Warning	PHI	40 min
May 16, 4:36 PM EDT	Severe Thunderstorm Watch	SPC	3 hr
May 16, 6:13 PM EDT	Mesoscale Discussion	SPC	92 min
May 16, 6:35 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	70 min
May 21, 3:54 PM EDT	Coastal Flood Advisory	PHI	7 hr
May 26, 3:05 PM EDT	Coastal Flood Advisory	PHI	14 hr
May 30, 2:13 AM EDT	Flood Watch	PHI	28 hr
May 30, 3:49 PM EDT	Mesoscale Discussion	SPC	116 min
May 30, 5:01 PM EDT	Tornado Watch	SPC	7 hr
May 30, 8:37 PM EDT	Mesoscale Discussion	SPC	113 min
May 30, 9:04 PM EDT	Wind Advisory	PHI	10 hr
May 30, 10:26 PM EDT	Flash Flood Warning	PHI	4 hr
May 30, 10:26 PM EDT	Severe Thunderstorm Warning	PHI	49 min
May 30, 10:55 PM EDT	Tornado Warning	PHI	22 min
May 31, 11:52 AM EDT	Mesoscale Discussion	SPC	2 hr
Jun 10, 6:24 AM EDT	Dense Fog Advisory	PHI	5 hr
Jun 17, 2:33 PM EDT	Heat Advisory	PHI	52 hr
Jun 18, 11:36 AM EDT	Mesoscale Discussion	SPC	114 min
Jun 18, 12:43 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 18, 2:52 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 19, 1:22 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 19, 1:46 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 19, 3:22 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 19, 4:34 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	41 min
Jun 19, 5:02 PM EDT	Tornado Warning Considerable damage threat	PHI	15 min
Jun 19, 5:08 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	52 min
Jun 19, 5:13 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	47 min
Jun 19, 5:23 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Jun 19, 5:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 19, 5:41 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	49 min
Jun 19, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	39 min
Jun 20, 2:12 AM EDT	Extreme Heat Watch	PHI	24 hr
Jun 21, 2:06 AM EDT	Heat Advisory	PHI	6 days
Jun 21, 2:06 AM EDT	Extreme Heat Warning	PHI	5 days
Jun 26, 4:25 AM EDT	Coastal Flood Advisory	PHI	23 hr
Jun 26, 1:54 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 26, 2:20 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 26, 6:55 PM EDT	Mesoscale Discussion	SPC	95 min
Jun 26, 7:14 PM EDT	Severe Thunderstorm Warning	PHI	46 min
Jun 26, 7:27 PM EDT	Flash Flood Warning	PHI	4 hr
Jun 27, 12:59 PM EDT	Heat Advisory	PHI	31 hr
Jun 27, 6:36 PM EDT	Coastal Flood Advisory	PHI	12 hr
Jun 29, 1:07 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 30, 3:19 AM EDT	Heat Advisory	PHI	13 hr
Jun 30, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	47 min
Jun 30, 1:55 PM EDT	Flash Flood Warning	PHI	4 hr
Jun 30, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	38 min
Jun 30, 9:41 PM EDT	Severe Thunderstorm Warning	PHI	64 min
Jul 1, 2:30 AM EDT	Flood Watch	PHI	19 hr
Jul 1, 11:48 AM EDT	Mesoscale Discussion	SPC	117 min
Jul 1, 12:59 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 1, 2:32 PM EDT	Severe Thunderstorm Warning	PHI	43 min
Jul 1, 3:02 PM EDT	Mesoscale Discussion	SPC	118 min
Jul 1, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	55 min
Jul 1, 5:56 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 7, 2:06 AM EDT	Heat Advisory	PHI	42 hr
Jul 7, 2:16 AM EDT	Flood Watch	PHI	20 hr
Jul 7, 10:59 PM EDT	Flood Watch	PHI	23 hr
Jul 8, 12:34 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 8, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 8, 3:32 PM EDT	Mesoscale Discussion	SPC	118 min
Jul 8, 5:31 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 8, 5:45 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 8, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	60 min
Jul 8, 6:46 PM EDT	Mesoscale Discussion	SPC	119 min
Jul 8, 9:52 PM EDT	Flood Watch	PHI	26 hr
Jul 9, 12:49 PM EDT	Mesoscale Discussion	SPC	116 min
Jul 9, 4:43 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 9, 5:31 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 9, 7:18 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 9, 7:24 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Jul 9, 7:38 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 9, 8:00 PM EDT	Flash Flood Warning Considerable damage threat	PHI	4 hr
Jul 9, 8:32 PM EDT	Flash Flood Warning Considerable damage threat	PHI	4 hr
Jul 9, 8:35 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 9, 8:46 PM EDT	Tornado Warning	PHI	29 min
Jul 9, 9:30 PM EDT	River Flood Warning	PHI	7 hr
Jul 9, 11:27 PM EDT	River Flood Warning	PHI	8 hr
Jul 9, 11:44 PM EDT	Areal Flood Warning	PHI	4 hr
Jul 13, 1:44 PM EDT	Flood Watch	PHI	32 hr
Jul 14, 2:20 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 14, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	31 min
Jul 14, 3:33 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 14, 4:34 PM EDT	Flash Flood Warning	PHI	4 hr
Jul 15, 2:37 PM EDT	Flood Watch	PHI	34 hr
Jul 16, 1:55 AM EDT	Heat Advisory	PHI	42 hr
Jul 16, 10:43 PM EDT	Flash Flood Warning	PHI	2 hr
Jul 16, 10:44 PM EDT	Severe Thunderstorm Warning	PHI	46 min
Jul 22, 8:39 PM EDT	Coastal Flood Advisory	PHI	3 hr
Jul 23, 3:37 AM EDT	Coastal Flood Advisory	PHI	24 hr
Jul 23, 1:41 PM EDT	Extreme Heat Watch	PHI	13 hr
Jul 24, 2:37 AM EDT	Extreme Heat Warning	PHI	40 hr
Jul 25, 1:41 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 25, 7:09 PM EDT	Mesoscale Discussion	SPC	96 min
Jul 25, 9:09 PM EDT	Severe Thunderstorm Warning	PHI	44 min
Jul 28, 3:00 AM EDT	Heat Advisory	PHI	65 hr
Jul 30, 2:10 PM EDT	Flood Watch	PHI	31 hr
Jul 31, 11:29 AM EDT	Mesoscale Discussion	SPC	3 hr
Jul 31, 1:15 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 31, 2:05 PM EDT	Severe Thunderstorm Warning	PHI	40 min
Jul 31, 2:09 PM EDT	Flash Flood Warning Considerable damage threat	PHI	4 hr
Jul 31, 2:46 PM EDT	Flash Flood Warning Considerable damage threat	PHI	4 hr
Jul 31, 2:55 PM EDT	Severe Thunderstorm Warning	PHI	50 min
Jul 31, 4:02 PM EDT	Mesoscale Discussion	SPC	118 min
Aug 13, 12:07 PM EDT	Flood Watch	PHI	9 hr
Aug 13, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	49 min
Aug 13, 6:59 PM EDT	Flash Flood Warning	PHI	2 hr
Aug 17, 3:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 17, 6:28 PM EDT	Mesoscale Discussion	SPC	62 min
Aug 20, 4:15 PM EDT	Coastal Flood Advisory	PHI	4 days
Sep 6, 11:56 AM EDT	Mesoscale Discussion	SPC	94 min
Sep 6, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 6, 6:00 PM EDT	Severe Thunderstorm Warning	PHI	32 min
Sep 9, 12:40 PM EDT	Coastal Flood Advisory	PHI	52 hr
Sep 25, 3:22 PM EDT	Mesoscale Discussion	SPC	113 min
Sep 30, 5:49 PM EDT	Coastal Flood Advisory	PHI	32 hr
Oct 9, 5:14 AM EDT	Coastal Flood Watch	PHI	46 hr
Oct 11, 3:19 AM EDT	Coastal Flood Warning	PHI	3 days
Oct 24, 10:37 AM EDT	Frost Advisory	PHI	22 hr
Oct 25, 2:16 PM EDT	Frost Advisory	PHI	19 hr
Oct 26, 2:50 PM EDT	Frost Advisory	PHI	18 hr
Oct 27, 2:40 PM EDT	Frost Advisory	PHI	18 hr
Oct 28, 10:52 AM EDT	Coastal Flood Advisory	PHI	3 days
Oct 30, 2:52 PM EDT	Wind Advisory	PHI	30 hr
Oct 30, 3:16 PM EDT	Mesoscale Discussion	SPC	119 min
Nov 5, 2:18 AM EST	Wind Advisory	PHI	26 hr
Nov 6, 3:48 AM EST	Frost Advisory	PHI	28 hr
Nov 6, 11:54 PM EST	Freeze Warning	PHI	8 hr
Nov 15, 7:05 PM EST	Wind Advisory	PHI	24 hr
Dec 12, 1:37 PM EST	Winter Weather Advisory	PHI	47 hr
Dec 17, 2:07 PM EST	Wind Advisory	PHI	59 hr
Dec 19, 1:40 PM EST	Severe Thunderstorm Warning	PHI	65 min
Dec 19, 4:34 PM EST	High Wind Warning	PHI	5 hr
Dec 25, 1:14 PM EST	Winter Weather Advisory	PHI	45 hr
Dec 28, 1:25 PM EST	Wind Advisory	PHI	51 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	30
Tornado Warning	3
Severe Thunderstorm Watch	12
Tornado Watch	1
Mesoscale Discussion	39
Flooding
Areal Flood Warning	1
Flash Flood Warning	17
River Flood Warning	2
Flood Watch	9
Winter
Winter Storm Warning	1
Winter Storm Watch	2
Winter Weather Advisory	7
Heat
Extreme Heat Warning	2
Extreme Heat Watch	2
Heat Advisory	7
Cold
Freeze Warning	1
Cold Weather Advisory	1
Frost Advisory	6
Wind and dust
High Wind Warning	2
High Wind Watch	1
Wind Advisory	13
Fire
Red Flag Warning	1
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	5
Coast and beach
Coastal Flood Warning	1
Coastal Flood Watch	1
Coastal Flood 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 2024 2026

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.