Alert archive / Pennsylvania / Lehigh County

Weather alerts in Lehigh County, Pennsylvania, 2024

180 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Lehigh County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts: 180
Warnings: 77
Watches: 29
Advisories: 43
Busiest month: August32 alerts
Busiest day: February 17, 202413 alerts

Over time

By month

Warning verification

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

Lehigh County, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	28	22	21%	22	86%	15 min
Flash flood warnings	5	2	60%	1	100%	301 min

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Philadelphia/Mount Holly: tornado warnings	7	1	86%	1	100%	13 min
NWS Philadelphia/Mount Holly: severe thunderstorm warnings	219	137	37%	463	90%	23 min
NWS Philadelphia/Mount Holly: flash flood warnings	66	27	59%	61	84%	86 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 5, 12:55 PM EST	Winter Storm Warning	PHI	38 hr
Jan 5, 12:55 PM EST	Winter Weather Advisory	PHI	34 hr
Jan 6, 4:27 PM EST	Mesoscale Discussion	SPC	5 hr
Jan 7, 3:15 PM EST	Flood Watch	PHI	60 hr
Jan 8, 3:27 PM EST	Wind Advisory	PHI	33 hr
Jan 9, 4:20 PM EST	River Flood Warning	PHI	23 hr
Jan 9, 6:13 PM EST	Areal Flood Warning	PHI	6 hr
Jan 9, 6:26 PM EST	Areal Flood Warning	PHI	6 hr
Jan 9, 11:54 PM EST	Areal Flood Warning	PHI	9 hr
Jan 9, 11:54 PM EST	Areal Flood Warning	PHI	19 hr
Jan 9, 11:54 PM EST	Areal Flood Warning	PHI	18 hr
Jan 10, 3:47 AM EST	Wind Advisory	PHI	12 hr
Jan 10, 4:13 AM EST	Areal Flood Warning	PHI	10 hr
Jan 11, 1:06 PM EST	Flood Watch	PHI	39 hr
Jan 11, 3:48 PM EST	Wind Advisory	PHI	49 hr
Jan 13, 4:08 AM EST	Areal Flood Warning	PHI	3 hr
Jan 14, 2:48 AM EST	Wind Advisory	PHI	15 hr
Jan 14, 11:07 AM EST	Snow Squall Warning	PHI	38 min
Jan 15, 4:12 AM EST	Winter Weather Advisory	PHI	35 hr
Jan 17, 3:16 PM EST	Winter Weather Advisory	PHI	53 hr
Jan 24, 2:14 PM EST	Dense Fog Advisory	PHI	11 hr
Jan 26, 5:33 PM EST	Dense Fog Advisory	PHI	16 hr
Feb 10, 3:16 PM EST	Winter Storm Watch	PHI	37 hr
Feb 11, 3:16 PM EST	Winter Storm Warning	PHI	46 hr
Feb 15, 3:33 PM EST	Winter Weather Advisory	PHI	42 hr
Feb 16, 3:28 PM EST	Winter Storm Warning	PHI	18 hr
Feb 16, 10:33 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 17, 12:46 AM EST	Special Weather Statement	PHI	59 min
Feb 17, 2:02 AM EST	Special Weather Statement	PHI	58 min
Feb 17, 2:08 PM EST	Snow Squall Warning	PHI	37 min
Feb 17, 2:26 PM EST	Snow Squall Warning	PHI	34 min
Feb 17, 2:42 PM EST	Snow Squall Warning	PHI	33 min
Feb 17, 2:57 PM EST	Snow Squall Warning Significant damage threat	PHI	33 min
Feb 17, 3:10 PM EST	Snow Squall Warning Significant damage threat	PHI	50 min
Feb 17, 3:28 PM EST	Snow Squall Warning Significant damage threat	PHI	47 min
Feb 17, 4:09 PM EST	Snow Squall Warning	PHI	36 min
Feb 17, 4:16 PM EST	Snow Squall Warning	PHI	29 min
Feb 17, 4:44 PM EST	Snow Squall Warning Significant damage threat	PHI	46 min
Feb 17, 5:27 PM EST	Snow Squall Warning Significant damage threat	PHI	48 min
Feb 27, 3:16 PM EST	Wind Advisory	PHI	35 hr
Feb 28, 8:13 AM EST	Special Weather Statement	PHI	47 min
Mar 2, 1:31 PM EST	Areal Flood Advisory	PHI	4 hr
Mar 2, 2:45 PM EST	Areal Flood Advisory	PHI	3 hr
Mar 8, 1:03 PM EST	Flood Watch	PHI	37 hr
Mar 9, 2:43 PM EST	Wind Advisory	PHI	51 hr
Mar 9, 8:03 PM EST	Areal Flood Advisory	PHI	3 hr
Mar 9, 8:09 PM EST	Areal Flood Advisory	PHI	3 hr
Mar 9, 8:11 PM EST	Areal Flood Advisory	PHI	3 hr
Mar 10, 12:47 AM EST	Areal Flood Warning	PHI	5 hr
Mar 10, 7:04 PM EDT	Snow Squall Warning	PHI	26 min
Mar 21, 3:29 PM EDT	Flood Watch	PHI	51 hr
Mar 22, 2:17 PM EDT	Wind Advisory	PHI	36 hr
Mar 23, 12:42 PM EDT	Areal Flood Advisory	PHI	5 hr
Mar 23, 5:15 PM EDT	Areal Flood Warning	PHI	5 hr
Apr 2, 1:59 PM EDT	Flood Watch	PHI	37 hr
Apr 2, 5:07 PM EDT	Areal Flood Warning	PHI	3 hr
Apr 3, 11:23 AM EDT	Areal Flood Warning	PHI	16 hr
Apr 3, 8:39 PM EDT	Areal Flood Warning	PHI	4 hr
Apr 4, 4:13 AM EDT	Areal Flood Warning	PHI	7 hr
Apr 13, 2:52 AM EDT	Wind Advisory	PHI	12 hr
Apr 14, 7:53 PM EDT	Special Weather Statement	PHI	22 min
Apr 21, 3:16 PM EDT	Frost Advisory	PHI	18 hr
Apr 22, 9:51 AM EDT	Frost Advisory	PHI	23 hr
Apr 22, 6:36 PM EDT	Freeze Warning	PHI	14 hr
Apr 24, 2:59 PM EDT	Frost Advisory	PHI	18 hr
Apr 24, 2:59 PM EDT	Freeze Warning	PHI	15 hr
Apr 25, 1:12 AM EDT	Freeze Watch	PHI	11 hr
Apr 25, 12:37 PM EDT	Freeze Warning	PHI	20 hr
Apr 26, 1:59 PM EDT	Frost Advisory	PHI	19 hr
Apr 30, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	53 min
Apr 30, 7:38 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Apr 30, 8:14 PM EDT	Severe Thunderstorm Warning	PHI	46 min
May 6, 12:06 AM EDT	Dense Fog Advisory	PHI	10 hr
May 23, 8:21 AM EDT	Severe Thunderstorm Warning	PHI	39 min
May 27, 11:53 AM EDT	Mesoscale Discussion	SPC	2 hr
May 27, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 27, 4:40 PM EDT	Mesoscale Discussion	SPC	95 min
May 27, 7:40 PM EDT	Mesoscale Discussion	SPC	2 hr
May 27, 8:28 PM EDT	Severe Thunderstorm Warning	PHI	47 min
May 27, 8:46 PM EDT	Severe Thunderstorm Warning	PHI	44 min
Jun 6, 12:58 PM EDT	Mesoscale Discussion	SPC	92 min
Jun 14, 2:34 PM EDT	Mesoscale Discussion	SPC	116 min
Jun 14, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	38 min
Jun 14, 4:40 PM EDT	Severe Thunderstorm Warning	PHI	50 min
Jun 16, 3:47 AM EDT	Heat Advisory	PHI	8 days
Jun 16, 3:14 PM EDT	Excessive Heat Watch	PHI	6 days
Jun 23, 3:23 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 23, 4:33 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 26, 4:02 PM EDT	Mesoscale Discussion	SPC	118 min
Jun 26, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	46 min
Jun 26, 6:19 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 26, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	47 min
Jun 29, 5:13 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 29, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Jun 29, 6:38 PM EDT	Mesoscale Discussion	SPC	97 min
Jun 29, 6:54 PM EDT	Severe Thunderstorm Warning	PHI	51 min
Jun 30, 9:55 AM EDT	Mesoscale Discussion	SPC	2 hr
Jun 30, 11:09 AM EDT	Severe Thunderstorm Watch	SPC	10 hr
Jun 30, 2:45 PM EDT	Severe Thunderstorm Warning	PHI	45 min
Jun 30, 3:46 PM EDT	Severe Thunderstorm Warning	PHI	44 min
Jun 30, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	53 min
Jul 4, 3:34 AM EDT	Heat Advisory	PHI	64 hr
Jul 7, 2:42 PM EDT	Heat Advisory	PHI	3 days
Jul 9, 3:01 PM EDT	Excessive Heat Warning	PHI	29 hr
Jul 10, 7:17 PM EDT	Mesoscale Discussion	SPC	88 min
Jul 12, 3:37 PM EDT	Excessive Heat Watch	PHI	72 hr
Jul 12, 3:37 PM EDT	Heat Advisory	PHI	5 days
Jul 13, 5:44 AM EDT	Areal Flood Warning	PHI	3 hr
Jul 14, 12:07 PM EDT	Severe Thunderstorm Warning	PHI	38 min
Jul 14, 12:44 PM EDT	Severe Thunderstorm Warning	PHI	46 min
Jul 14, 12:56 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 14, 3:03 PM EDT	Excessive Heat Warning	PHI	3 days
Jul 16, 2:35 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 16, 3:36 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 16, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	49 min
Jul 16, 5:01 PM EDT	Severe Thunderstorm Warning	PHI	44 min
Jul 16, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	60 min
Jul 16, 7:11 PM EDT	Severe Thunderstorm Warning	PHI	49 min
Jul 16, 7:23 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Jul 17, 12:27 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 17, 12:58 PM EDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 17, 3:50 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 17, 6:18 PM EDT	Severe Thunderstorm Warning	PHI	57 min
Jul 17, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	54 min
Jul 17, 7:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 17, 7:18 PM EDT	Flash Flood Warning	PHI	2 hr
Jul 31, 3:56 AM EDT	Heat Advisory	PHI	64 hr
Aug 1, 2:53 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 2, 2:23 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Aug 2, 2:30 PM EDT	Severe Thunderstorm Warning	PHI	45 min
Aug 3, 12:20 PM EDT	Flood Watch	PHI	9 hr
Aug 3, 12:56 PM EDT	Mesoscale Discussion	SPC	94 min
Aug 3, 1:20 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 3, 2:53 PM EDT	Mesoscale Discussion	SPC	67 min
Aug 3, 4:13 PM EDT	Severe Thunderstorm Warning	PHI	47 min
Aug 5, 3:16 AM EDT	Flood Watch	PHI	48 hr
Aug 6, 9:37 AM EDT	Heat Advisory	PHI	9 hr
Aug 6, 1:06 PM EDT	Mesoscale Discussion	SPC	84 min
Aug 6, 1:54 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 6, 4:29 PM EDT	Mesoscale Discussion	SPC	61 min
Aug 6, 6:37 PM EDT	Flash Flood Warning	PHI	3 hr
Aug 8, 3:13 PM EDT	Wind Advisory	PHI	27 hr
Aug 8, 6:04 PM EDT	Flood Watch	PHI	24 hr
Aug 9, 4:38 AM EDT	Mesoscale Discussion	SPC	3 hr
Aug 9, 6:17 AM EDT	Tornado Watch	SPC	8 hr
Aug 9, 10:26 AM EDT	Mesoscale Discussion	SPC	94 min
Aug 9, 1:27 PM EDT	Tornado Watch	SPC	7 hr
Aug 9, 2:50 PM EDT	Flash Flood Warning	PHI	2 hr
Aug 9, 6:46 PM EDT	Areal Flood Warning	PHI	4 hr
Aug 17, 3:26 PM EDT	Flood Watch	PHI	33 hr
Aug 18, 1:09 PM EDT	Mesoscale Discussion	SPC	96 min
Aug 18, 2:02 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 18, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	28 min
Aug 18, 4:30 PM EDT	Mesoscale Discussion	SPC	90 min
Aug 18, 5:31 PM EDT	Flash Flood Warning	PHI	6 hr
Aug 18, 8:28 PM EDT	Flash Flood Warning	PHI	3 hr
Aug 19, 2:25 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 26, 3:20 PM EDT	Excessive Heat Watch	PHI	13 hr
Aug 27, 3:59 AM EDT	Heat Advisory	PHI	40 hr
Oct 10, 3:19 AM EDT	Frost Advisory	PHI	30 hr
Oct 14, 3:03 PM EDT	Frost Advisory	PHI	18 hr
Oct 15, 1:41 PM EDT	Frost Advisory	PHI	17 hr
Oct 15, 2:24 PM EDT	Freeze Watch	PHI	12 hr
Oct 16, 2:46 AM EDT	Freeze Warning	PHI	30 hr
Oct 31, 2:50 PM EDT	Fire Weather Watch	PHI	18 hr
Oct 31, 2:50 PM EDT	Red Flag Warning	PHI	28 hr
Nov 7, 2:54 PM EST	Red Flag Warning	PHI	27 hr
Nov 14, 3:37 PM EST	Fire Weather Watch	PHI	23 hr
Nov 15, 2:28 PM EST	Red Flag Warning	PHI	28 hr
Dec 3, 3:03 PM EST	Wind Advisory	PHI	55 hr
Dec 3, 3:41 PM EST	Snow Squall Warning	PHI	49 min
Dec 3, 4:20 PM EST	Snow Squall Warning	PHI	25 min
Dec 5, 8:39 AM EST	Snow Squall Warning	PHI	36 min
Dec 5, 9:15 AM EST	Snow Squall Warning	PHI	45 min
Dec 9, 9:43 PM EST	Dense Fog Advisory	PHI	13 hr
Dec 10, 2:42 PM EST	Wind Advisory	PHI	30 hr
Dec 14, 2:38 PM EST	Winter Weather Advisory	PHI	42 hr
Dec 20, 3:09 AM EST	Winter Weather Advisory	PHI	28 hr
Dec 26, 3:14 PM EST	Winter Weather Advisory	PHI	43 hr
Dec 28, 6:16 PM EST	Dense Fog Advisory	PHI	16 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	28
Severe Thunderstorm Watch	10
Tornado Watch	2
Mesoscale Discussion	27
Special Weather Statement	4
Flooding
Areal Flood Warning	15
Flash Flood Warning	5
River Flood Warning	1
Flood Watch	9
Areal Flood Advisory	6
Winter
Snow Squall Warning	16
Winter Storm Warning	3
Winter Storm Watch	1
Winter Weather Advisory	7
Heat
Excessive Heat Warning	2
Excessive Heat Watch	3
Heat Advisory	7
Cold
Freeze Warning	4
Freeze Watch	2
Frost Advisory	7
Wind and dust
Wind Advisory	11
Fire
Red Flag Warning	3
Fire Weather Watch	2
Fog and smoke
Dense Fog Advisory	5

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2023 2025

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.