Alert archive / Pennsylvania / Northampton County

Weather alerts in Northampton County, Pennsylvania, 2020

203 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Northampton County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts: 203
Warnings: 62
Watches: 23
Advisories: 57
Busiest month: August47 alerts
Busiest day: July 6, 202010 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 Northampton County in 2020 had a tornado report inside them.

Northampton County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	0	100%	0
Severe thunderstorm warnings	34	28	18%	42	76%	31 min
Flash flood warnings	4	3	25%	12	100%	152 min

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Philadelphia/Mount Holly: tornado warnings	36	9	75%	27	59%	12 min
NWS Philadelphia/Mount Holly: severe thunderstorm warnings	308	233	24%	1,626	89%	26 min
NWS Philadelphia/Mount Holly: flash flood warnings	65	45	31%	286	94%	96 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 4, 8:33 AM EST	Dense Fog Advisory	PHI	4 hr
Jan 8, 7:49 AM EST	Snow Squall Warning	PHI	41 min
Jan 8, 2:32 PM EST	Special Weather Statement	PHI	28 min
Jan 8, 3:05 PM EST	Special Weather Statement	PHI	40 min
Jan 11, 1:12 PM EST	Wind Advisory	PHI	24 hr
Jan 12, 5:12 AM EST	Special Weather Statement	PHI	48 min
Jan 15, 1:18 PM EST	Wind Advisory	PHI	30 hr
Jan 16, 1:39 PM EST	Special Weather Statement	PHI	21 min
Jan 16, 2:19 PM EST	Special Weather Statement	PHI	26 min
Jan 16, 4:18 PM EST	Snow Squall Warning	PHI	45 min
Jan 17, 3:37 AM EST	Winter Weather Advisory	PHI	41 hr
Jan 24, 3:16 AM EST	Winter Weather Advisory	PHI	33 hr
Feb 1, 2:02 AM EST	Dense Fog Advisory	PHI	9 hr
Feb 4, 2:54 PM EST	Winter Weather Advisory	PHI	43 hr
Feb 6, 2:55 PM EST	Wind Advisory	PHI	27 hr
Feb 7, 9:43 AM EST	Severe Thunderstorm Warning	PHI	62 min
Feb 27, 9:10 AM EST	Wind Advisory	PHI	9 hr
Feb 29, 11:05 AM EST	Snow Squall Warning	PHI	55 min
Mar 3, 6:50 PM EST	Mesoscale Discussion	SPC	2 hr
Mar 3, 8:09 PM EST	Special Weather Statement	PHI	51 min
Mar 3, 8:39 PM EST	Severe Thunderstorm Warning	PHI	51 min
Mar 3, 10:52 PM EST	Mesoscale Discussion	SPC	113 min
Mar 20, 2:32 AM EDT	Dense Fog Advisory	PHI	6 hr
Mar 28, 11:51 AM EDT	Areal Flood Advisory	PHI	3 hr
Apr 8, 1:53 AM EDT	Special Weather Statement	PHI	37 min
Apr 8, 2:40 AM EDT	Special Weather Statement	PHI	35 min
Apr 8, 7:19 PM EDT	Wind Advisory	PHI	24 hr
Apr 9, 11:09 AM EDT	Mesoscale Discussion	SPC	66 min
Apr 9, 12:05 PM EDT	Special Weather Statement	PHI	40 min
Apr 9, 3:32 PM EDT	Wind Advisory	PHI	27 hr
Apr 10, 3:33 AM EDT	Freeze Watch	PHI	12 hr
Apr 10, 3:29 PM EDT	Freeze Warning	PHI	18 hr
Apr 12, 12:25 PM EDT	Wind Advisory	PHI	29 hr
Apr 13, 11:33 AM EDT	Tornado Watch	SPC	5 hr
Apr 13, 1:01 PM EDT	Areal Flood Advisory	PHI	4 hr
Apr 13, 1:07 PM EDT	Flash Flood Warning	PHI	4 hr
Apr 13, 1:20 PM EDT	Mesoscale Discussion	SPC	85 min
Apr 13, 2:37 PM EDT	Areal Flood Advisory	PHI	2 hr
Apr 14, 3:34 PM EDT	Frost Advisory	PHI	39 hr
Apr 15, 2:52 AM EDT	Freeze Watch	PHI	36 hr
Apr 16, 3:19 PM EDT	Freeze Warning	PHI	18 hr
Apr 16, 6:02 PM EDT	Special Weather Statement	PHI	43 min
Apr 18, 3:07 AM EDT	Freeze Warning	PHI	29 hr
Apr 21, 3:34 AM EDT	Freeze Warning	PHI	28 hr
Apr 21, 12:23 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 21, 1:04 PM EDT	Severe Thunderstorm Warning	PHI	26 min
Apr 22, 3:03 PM EDT	Freeze Warning	PHI	16 hr
Apr 25, 3:20 AM EDT	Dense Fog Advisory	PHI	3 hr
Apr 27, 3:12 PM EDT	Frost Advisory	PHI	17 hr
Apr 29, 3:14 AM EDT	Flood Watch	PHI	48 hr
May 7, 3:46 PM EDT	Freeze Watch	PHI	12 hr
May 7, 3:46 PM EDT	Freeze Warning	PHI	41 hr
May 9, 3:46 AM EDT	Freeze Warning	PHI	29 hr
May 11, 3:24 AM EDT	Frost Advisory	PHI	27 hr
May 12, 9:22 AM EDT	Freeze Warning	PHI	23 hr
May 13, 2:20 PM EDT	Frost Advisory	PHI	18 hr
May 29, 12:27 PM EDT	Mesoscale Discussion	SPC	63 min
May 29, 2:25 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 29, 3:03 PM EDT	Mesoscale Discussion	SPC	87 min
May 29, 4:46 PM EDT	Areal Flood Advisory	PHI	115 min
May 29, 4:54 PM EDT	Special Weather Statement	PHI	66 min
May 29, 8:01 PM EDT	Mesoscale Discussion	SPC	119 min
Jun 3, 10:08 AM EDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 3, 11:04 AM EDT	Severe Thunderstorm Warning	PHI	41 min
Jun 3, 11:34 AM EDT	Mesoscale Discussion	SPC	86 min
Jun 3, 11:38 AM EDT	Severe Thunderstorm Warning	PHI	37 min
Jun 3, 6:58 PM EDT	Mesoscale Discussion	SPC	92 min
Jun 4, 10:46 PM EDT	Areal Flood Advisory	PHI	119 min
Jun 5, 9:47 AM EDT	Flash Flood Watch	PHI	12 hr
Jun 10, 3:16 AM EDT	Heat Advisory	PHI	15 hr
Jun 19, 6:46 PM EDT	Areal Flood Advisory	PHI	3 hr
Jun 21, 4:14 AM EDT	Dense Fog Advisory	PHI	5 hr
Jun 24, 12:04 AM EDT	Areal Flood Advisory	PHI	115 min
Jun 24, 12:38 AM EDT	Special Weather Statement	PHI	37 min
Jun 24, 12:53 AM EDT	Areal Flood Advisory	PHI	89 min
Jun 27, 12:34 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 27, 2:51 PM EDT	Special Weather Statement	PHI	24 min
Jun 27, 3:01 PM EDT	Severe Thunderstorm Warning	PHI	44 min
Jun 27, 3:32 PM EDT	Areal Flood Advisory	PHI	3 hr
Jun 27, 3:37 PM EDT	Severe Thunderstorm Warning	PHI	53 min
Jun 28, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 28, 2:02 PM EDT	Severe Thunderstorm Warning	PHI	13 min
Jun 28, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	40 min
Jun 28, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	46 min
Jul 3, 6:09 PM EDT	Special Weather Statement	PHI	36 min
Jul 3, 6:38 PM EDT	Special Weather Statement	PHI	37 min
Jul 3, 7:15 PM EDT	Special Weather Statement	PHI	30 min
Jul 6, 12:33 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 6, 1:38 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 6, 3:00 PM EDT	Severe Thunderstorm Warning	PHI	45 min
Jul 6, 3:38 PM EDT	Severe Thunderstorm Warning	PHI	52 min
Jul 6, 3:56 PM EDT	Severe Thunderstorm Warning	PHI	64 min
Jul 6, 4:31 PM EDT	Severe Thunderstorm Warning	PHI	44 min
Jul 6, 4:33 PM EDT	Mesoscale Discussion	SPC	117 min
Jul 6, 5:00 PM EDT	Severe Thunderstorm Warning	PHI	45 min
Jul 6, 5:01 PM EDT	Areal Flood Advisory	PHI	119 min
Jul 6, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	43 min
Jul 8, 12:13 PM EDT	Flash Flood Watch	PHI	6 hr
Jul 8, 12:29 PM EDT	Special Weather Statement	PHI	61 min
Jul 9, 3:00 PM EDT	Flash Flood Watch	PHI	30 hr
Jul 10, 3:12 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 10, 9:29 PM EDT	Areal Flood Advisory	PHI	9 min
Jul 10, 9:36 PM EDT	Areal Flood Warning	PHI	8 hr
Jul 11, 2:06 PM EDT	Mesoscale Discussion	SPC	84 min
Jul 16, 3:43 PM EDT	Excessive Heat Watch	PHI	36 hr
Jul 18, 3:55 AM EDT	Heat Advisory	PHI	64 hr
Jul 19, 5:52 PM EDT	Mesoscale Discussion	SPC	83 min
Jul 20, 7:57 PM EDT	Heat Advisory	PHI	48 hr
Jul 22, 1:45 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 22, 2:10 PM EDT	Severe Thunderstorm Warning	PHI	50 min
Jul 22, 2:57 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 22, 4:10 PM EDT	Severe Thunderstorm Warning	PHI	65 min
Jul 22, 4:49 PM EDT	Severe Thunderstorm Warning	PHI	56 min
Jul 22, 4:55 PM EDT	Mesoscale Discussion	SPC	95 min
Jul 22, 5:16 PM EDT	Severe Thunderstorm Warning	PHI	59 min
Jul 22, 5:23 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 23, 12:58 PM EDT	Special Weather Statement	PHI	32 min
Jul 23, 2:43 PM EDT	Areal Flood Advisory	PHI	4 hr
Jul 23, 2:49 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 23, 3:03 PM EDT	Special Weather Statement	PHI	27 min
Jul 23, 4:28 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 23, 5:14 PM EDT	Special Weather Statement	PHI	31 min
Jul 23, 6:48 PM EDT	Mesoscale Discussion	SPC	57 min
Jul 30, 1:20 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 30, 11:51 PM EDT	Severe Thunderstorm Warning	PHI	54 min
Aug 2, 6:53 AM EDT	Mesoscale Discussion	SPC	3 hr
Aug 2, 7:13 AM EDT	Areal Flood Advisory	PHI	3 hr
Aug 2, 7:34 AM EDT	Areal Flood Advisory	PHI	3 hr
Aug 2, 7:39 AM EDT	Tornado Warning	PHI	36 min
Aug 2, 7:49 AM EDT	Areal Flood Advisory	PHI	84 min
Aug 2, 8:46 AM EDT	Areal Flood Advisory	PHI	3 hr
Aug 2, 2:00 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 2, 3:33 PM EDT	Flash Flood Watch	PHI	48 hr
Aug 2, 5:51 PM EDT	Special Weather Statement	PHI	39 min
Aug 2, 6:29 PM EDT	Special Weather Statement	PHI	31 min
Aug 2, 10:18 PM EDT	Special Weather Statement	PHI	42 min
Aug 4, 8:11 AM EDT	Flash Flood Warning	PHI	4 hr
Aug 4, 9:29 AM EDT	Tornado Warning	PHI	31 min
Aug 4, 9:38 AM EDT	Flash Flood Warning	PHI	4 hr
Aug 4, 11:13 AM EDT	Areal Flood Advisory	PHI	4 hr
Aug 4, 11:43 AM EDT	Flash Flood Warning	PHI	4 hr
Aug 4, 3:42 PM EDT	Areal Flood Warning	PHI	4 hr
Aug 4, 7:29 PM EDT	Areal Flood Warning	PHI	12 hr
Aug 4, 9:06 PM EDT	Special Weather Statement	PHI	39 min
Aug 6, 3:37 AM EDT	Flash Flood Watch	PHI	44 hr
Aug 7, 3:46 PM EDT	Areal Flood Advisory	PHI	4 hr
Aug 11, 3:48 PM EDT	Flash Flood Watch	PHI	28 hr
Aug 12, 5:04 PM EDT	Areal Flood Advisory	PHI	56 min
Aug 18, 12:31 AM EDT	Tornado Warning	PHI	29 min
Aug 18, 12:39 AM EDT	Severe Thunderstorm Warning	PHI	66 min
Aug 18, 12:58 AM EDT	Special Weather Statement	PHI	47 min
Aug 18, 1:13 AM EDT	Areal Flood Advisory	PHI	2 hr
Aug 18, 1:38 AM EDT	Severe Thunderstorm Warning	PHI	37 min
Aug 24, 12:44 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 24, 1:15 PM EDT	Severe Thunderstorm Warning	PHI	21 min
Aug 24, 1:48 PM EDT	Special Weather Statement	PHI	27 min
Aug 24, 2:20 PM EDT	Special Weather Statement	PHI	25 min
Aug 24, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	37 min
Aug 24, 5:11 PM EDT	Special Weather Statement	PHI	34 min
Aug 24, 5:40 PM EDT	Special Weather Statement	PHI	35 min
Aug 24, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	19 min
Aug 25, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 25, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	18 min
Aug 25, 6:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 27, 6:35 PM EDT	Mesoscale Discussion	SPC	115 min
Aug 27, 7:51 PM EDT	Severe Thunderstorm Warning	PHI	39 min
Aug 27, 8:13 PM EDT	Severe Thunderstorm Warning	PHI	47 min
Aug 29, 3:56 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 29, 6:08 PM EDT	Special Weather Statement	PHI	67 min
Aug 29, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	64 min
Aug 29, 6:45 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 29, 7:16 PM EDT	Severe Thunderstorm Warning	PHI	59 min
Sep 9, 5:08 PM EDT	Flash Flood Watch	PHI	29 hr
Sep 19, 2:46 PM EDT	Frost Advisory	PHI	17 hr
Sep 20, 3:16 PM EDT	Frost Advisory	PHI	15 hr
Sep 25, 8:01 AM EDT	Dense Fog Advisory	PHI	119 min
Sep 29, 9:24 PM EDT	Areal Flood Advisory	PHI	4 hr
Sep 29, 10:17 PM EDT	Areal Flood Advisory	PHI	3 hr
Oct 17, 3:46 AM EDT	Frost Advisory	PHI	28 hr
Oct 22, 12:25 AM EDT	Dense Fog Advisory	PHI	9 hr
Nov 1, 3:10 AM EST	Wind Advisory	PHI	36 hr
Nov 15, 3:33 PM EST	Mesoscale Discussion	SPC	2 hr
Nov 15, 5:35 PM EST	Severe Thunderstorm Watch	SPC	5 hr
Nov 15, 5:57 PM EST	Severe Thunderstorm Warning	PHI	78 min
Nov 15, 6:44 PM EST	Severe Thunderstorm Warning	PHI	76 min
Nov 15, 6:52 PM EST	Mesoscale Discussion	SPC	113 min
Nov 30, 3:26 PM EST	Areal Flood Warning	PHI	4 hr
Nov 30, 3:43 PM EST	Severe Thunderstorm Warning	PHI	47 min
Nov 30, 3:53 PM EST	Areal Flood Warning	PHI	16 hr
Dec 10, 3:53 PM EST	Freezing Fog Advisory	PHI	12 hr
Dec 12, 6:19 PM EST	Dense Fog Advisory	PHI	7 hr
Dec 13, 7:15 PM EST	Winter Storm Watch	PHI	44 hr
Dec 15, 3:18 AM EST	Winter Storm Warning	PHI	51 hr
Dec 16, 1:57 PM EST	Mesoscale Discussion	SPC	5 hr
Dec 16, 6:48 PM EST	Mesoscale Discussion	SPC	5 hr
Dec 22, 3:22 PM EST	Flood Watch	PHI	66 hr
Dec 23, 3:23 PM EST	Wind Advisory	PHI	38 hr
Dec 24, 9:16 PM EST	Areal Flood Advisory	PHI	3 hr
Dec 24, 10:09 PM EST	Areal Flood Advisory	PHI	6 hr
Dec 24, 11:54 PM EST	Areal Flood Warning	PHI	12 hr
Dec 25, 4:00 AM EST	River Flood Warning	PHI	16 hr
Dec 25, 4:31 AM EST	Areal Flood Warning	PHI	7 hr
Dec 26, 5:12 AM EST	River Flood Warning	PHI	10 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	34
Tornado Warning	3
Severe Thunderstorm Watch	8
Tornado Watch	1
Mesoscale Discussion	31
Special Weather Statement	30
Flooding
Areal Flood Warning	7
Flash Flood Warning	4
River Flood Warning	2
Flash Flood Watch	7
Flood Watch	2
Areal Flood Advisory	26
Winter
Snow Squall Warning	3
Winter Storm Warning	1
Winter Storm Watch	1
Winter Weather Advisory	3
Heat
Excessive Heat Watch	1
Heat Advisory	3
Cold
Freeze Warning	8
Freeze Watch	3
Frost Advisory	7
Wind and dust
Wind Advisory	9
Fog and smoke
Dense Fog Advisory	8
Freezing Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2019 2021

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.