Alert archive / Pennsylvania / Jefferson County

Weather alerts in Jefferson County, Pennsylvania, 2024

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

Jefferson County and its neighbors

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

Alerts: 153
Warnings: 49
Watches: 19
Advisories: 29
Busiest month: April36 alerts
Busiest day: August 6, 202412 alerts

Over time

By month

Warning verification

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

Jefferson County, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	28	25	11%	13	62%	13 min
Flash flood warnings	3	2	33%	1	0%

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Pittsburgh, PA: tornado warnings	37	14	62%	58	60%	10 min
NWS Pittsburgh, PA: severe thunderstorm warnings	283	206	27%	917	85%	20 min
NWS Pittsburgh, PA: flash flood warnings	45	27	40%	248	90%	162 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, 2:23 PM EST	Winter Weather Advisory	PBZ	29 hr
Jan 8, 3:01 AM EST	Wind Advisory	PBZ	62 hr
Jan 11, 1:28 PM EST	Wind Advisory	PBZ	55 hr
Jan 14, 4:33 AM EST	Special Weather Statement	PBZ	87 min
Jan 14, 6:00 AM EST	Special Weather Statement	PBZ	90 min
Jan 14, 6:31 AM EST	Snow Squall Warning	PBZ	29 min
Jan 14, 6:48 AM EST	Snow Squall Warning	PBZ	42 min
Jan 14, 7:02 AM EST	Snow Squall Warning	PBZ	13 min
Jan 14, 7:25 AM EST	Snow Squall Warning	PBZ	50 min
Jan 14, 8:12 AM EST	Snow Squall Warning	PBZ	48 min
Jan 14, 8:25 AM EST	Mesoscale Discussion	SPC	4 hr
Jan 16, 2:19 AM EST	Wind Chill Advisory	PBZ	35 hr
Jan 18, 2:57 AM EST	Winter Weather Advisory	PBZ	64 hr
Jan 22, 3:57 AM EST	Winter Weather Advisory	PBZ	32 hr
Jan 24, 3:19 AM EST	Dense Fog Advisory	PBZ	8 hr
Jan 24, 3:22 PM EST	Special Weather Statement	PBZ	83 min
Jan 24, 8:07 PM EST	Dense Fog Advisory	PBZ	25 hr
Jan 28, 1:24 PM EST	Special Weather Statement	PBZ	81 min
Feb 11, 12:46 PM EST	Winter Storm Watch	PBZ	23 hr
Feb 15, 6:47 PM EST	Wind Advisory	PBZ	6 hr
Feb 16, 3:02 AM EST	Winter Weather Advisory	PBZ	28 hr
Feb 17, 9:58 AM EST	Special Weather Statement	PBZ	47 min
Feb 17, 10:45 AM EST	Special Weather Statement	PBZ	60 min
Feb 17, 11:34 AM EST	Mesoscale Discussion	SPC	5 hr
Feb 22, 10:34 PM EST	Dense Fog Advisory	PBZ	9 hr
Mar 3, 6:28 AM EST	Special Weather Statement	PBZ	3 hr
Mar 9, 3:23 AM EST	Winter Weather Advisory	PBZ	46 hr
Mar 10, 12:13 PM EDT	Mesoscale Discussion	SPC	4 hr
Mar 10, 1:29 PM EDT	Special Weather Statement	PBZ	46 min
Mar 20, 11:50 AM EDT	Special Weather Statement	PBZ	40 min
Mar 31, 6:37 AM EDT	Dense Fog Advisory	PBZ	3 hr
Mar 31, 1:03 PM EDT	Flood Watch	PBZ	66 hr
Apr 2, 11:33 AM EDT	Flash Flood Warning	PBZ	3 hr
Apr 2, 2:28 PM EDT	Areal Flood Warning	PBZ	6 hr
Apr 3, 4:28 AM EDT	Areal Flood Warning	PBZ	27 hr
Apr 4, 2:20 AM EDT	Special Weather Statement	PBZ	55 min
Apr 11, 10:00 AM EDT	Flood Watch	PBZ	16 hr
Apr 12, 3:13 AM EDT	Wind Advisory	PBZ	39 hr
Apr 12, 9:52 AM EDT	River Flood Warning	PBZ	13 hr
Apr 14, 3:29 PM EDT	Mesoscale Discussion	SPC	2 hr
Apr 14, 4:58 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 14, 5:39 PM EDT	Severe Thunderstorm Warning	PBZ	51 min
Apr 14, 6:11 PM EDT	Severe Thunderstorm Warning	PBZ	7 min
Apr 14, 6:23 PM EDT	Severe Thunderstorm Warning	PBZ	52 min
Apr 14, 6:44 PM EDT	Severe Thunderstorm Warning	PBZ	46 min
Apr 14, 6:54 PM EDT	Severe Thunderstorm Warning	PBZ	51 min
Apr 14, 7:07 PM EDT	Severe Thunderstorm Warning	PBZ	38 min
Apr 14, 7:41 PM EDT	Severe Thunderstorm Warning	PBZ	49 min
Apr 14, 7:48 PM EDT	Severe Thunderstorm Warning	PBZ	42 min
Apr 14, 8:27 PM EDT	Severe Thunderstorm Warning	PBZ	48 min
Apr 14, 8:28 PM EDT	Flash Flood Warning	PBZ	3 hr
Apr 14, 9:18 PM EDT	Severe Thunderstorm Warning	PBZ	42 min
Apr 14, 9:34 PM EDT	Mesoscale Discussion	SPC	86 min
Apr 17, 3:46 PM EDT	Tornado Watch	SPC	7 hr
Apr 17, 6:13 PM EDT	Severe Thunderstorm Warning	PBZ	47 min
Apr 17, 6:15 PM EDT	Severe Thunderstorm Warning	PBZ	12 min
Apr 17, 6:23 PM EDT	Mesoscale Discussion	SPC	97 min
Apr 17, 6:29 PM EDT	Severe Thunderstorm Warning	PBZ	31 min
Apr 17, 7:00 PM EDT	Special Weather Statement	PBZ	15 min
Apr 17, 7:52 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	38 min
Apr 17, 8:28 PM EDT	Special Weather Statement	PBZ	32 min
Apr 20, 2:50 AM EDT	Freeze Watch	PBZ	11 hr
Apr 20, 1:20 PM EDT	Freeze Warning	PBZ	19 hr
Apr 21, 12:27 PM EDT	Freeze Warning	PBZ	21 hr
Apr 22, 1:05 PM EDT	Frost Advisory	PBZ	20 hr
Apr 23, 1:59 PM EDT	Freeze Watch	PBZ	24 hr
Apr 24, 2:14 PM EDT	Freeze Warning	PBZ	19 hr
Apr 25, 2:05 PM EDT	Freeze Warning	PBZ	19 hr
May 8, 2:14 AM EDT	Special Weather Statement	PBZ	46 min
May 22, 12:28 PM EDT	Mesoscale Discussion	SPC	2 hr
May 22, 2:56 PM EDT	Special Weather Statement	PBZ	49 min
May 25, 11:39 AM EDT	Mesoscale Discussion	SPC	3 hr
May 25, 2:14 PM EDT	Severe Thunderstorm Warning	PBZ	46 min
May 25, 3:10 PM EDT	Special Weather Statement	PBZ	50 min
May 26, 12:00 AM EDT	Dense Fog Advisory	PBZ	8 hr
May 26, 3:52 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 26, 9:22 PM EDT	Special Weather Statement	PBZ	83 min
May 27, 7:48 PM EDT	Special Weather Statement	PBZ	27 min
Jun 14, 11:40 AM EDT	Special Weather Statement	PBZ	35 min
Jun 14, 11:57 AM EDT	Special Weather Statement	PBZ	33 min
Jun 14, 12:17 PM EDT	Mesoscale Discussion	SPC	118 min
Jun 15, 9:53 AM EDT	Excessive Heat Watch	PBZ	40 hr
Jun 17, 2:06 AM EDT	Heat Advisory	PBZ	6 days
Jun 18, 1:35 PM EDT	Mesoscale Discussion	SPC	85 min
Jun 23, 1:42 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 23, 3:26 PM EDT	Severe Thunderstorm Warning	PBZ	34 min
Jun 23, 4:33 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 26, 12:32 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 26, 1:11 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 26, 4:22 PM EDT	Severe Thunderstorm Warning	PBZ	38 min
Jun 26, 4:49 PM EDT	Severe Thunderstorm Warning	PBZ	15 min
Jun 28, 2:53 PM EDT	Flood Watch	PBZ	28 hr
Jun 29, 12:03 PM EDT	Mesoscale Discussion	SPC	117 min
Jun 29, 1:11 PM EDT	Tornado Watch	SPC	7 hr
Jul 5, 12:45 AM EDT	Areal Flood Advisory	PBZ	118 min
Jul 10, 12:06 PM EDT	Tornado Watch	SPC	11 hr
Jul 15, 11:52 AM EDT	Mesoscale Discussion	SPC	113 min
Jul 15, 2:56 PM EDT	Special Weather Statement	PBZ	34 min
Jul 15, 3:11 PM EDT	Severe Thunderstorm Warning	PBZ	34 min
Jul 17, 2:33 PM EDT	Areal Flood Advisory	PBZ	87 min
Jul 24, 5:02 PM EDT	Mesoscale Discussion	SPC	88 min
Jul 24, 5:45 PM EDT	Special Weather Statement	PBZ	30 min
Aug 4, 6:23 AM EDT	Dense Fog Advisory	PBZ	3 hr
Aug 5, 12:48 PM EDT	Mesoscale Discussion	SPC	87 min
Aug 5, 1:21 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 5, 4:59 PM EDT	Mesoscale Discussion	SPC	91 min
Aug 6, 10:59 AM EDT	Mesoscale Discussion	SPC	91 min
Aug 6, 11:42 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 6, 12:42 PM EDT	Severe Thunderstorm Warning	PBZ	33 min
Aug 6, 12:52 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	53 min
Aug 6, 1:11 PM EDT	Severe Thunderstorm Warning	PBZ	19 min
Aug 6, 1:37 PM EDT	Severe Thunderstorm Warning	PBZ	53 min
Aug 6, 2:10 PM EDT	Mesoscale Discussion	SPC	95 min
Aug 6, 2:27 PM EDT	Severe Thunderstorm Warning	PBZ	18 min
Aug 6, 2:37 PM EDT	Flash Flood Warning	PBZ	3 hr
Aug 6, 4:29 PM EDT	Mesoscale Discussion	SPC	61 min
Aug 6, 6:29 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	61 min
Aug 6, 6:39 PM EDT	Severe Thunderstorm Warning	PBZ	66 min
Aug 6, 8:01 PM EDT	Areal Flood Advisory	PBZ	69 min
Aug 6, 8:03 PM EDT	Special Weather Statement	PBZ	42 min
Aug 9, 9:59 AM EDT	Areal Flood Warning	PBZ	6 hr
Aug 29, 1:20 PM EDT	Mesoscale Discussion	SPC	115 min
Sep 21, 2:37 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 21, 8:29 PM EDT	Severe Thunderstorm Warning	PBZ	24 min
Sep 22, 2:43 AM EDT	Dense Fog Advisory	PBZ	7 hr
Oct 6, 4:26 PM EDT	Mesoscale Discussion	SPC	94 min
Oct 6, 4:55 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Oct 6, 6:54 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 9, 1:07 PM EDT	Frost Advisory	PBZ	20 hr
Oct 10, 3:21 AM EDT	Frost Advisory	PBZ	30 hr
Oct 10, 12:24 PM EDT	Freeze Warning	PBZ	21 hr
Oct 13, 10:11 AM EDT	Special Weather Statement	PBZ	34 min
Oct 13, 4:58 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 14, 2:33 AM EDT	Freeze Watch	PBZ	12 hr
Oct 14, 2:39 PM EDT	Frost Advisory	PBZ	18 hr
Oct 15, 12:36 PM EDT	Freeze Warning	PBZ	20 hr
Oct 16, 11:30 AM EDT	Freeze Warning	PBZ	22 hr
Oct 17, 12:55 PM EDT	Freeze Warning	PBZ	20 hr
Nov 20, 10:10 AM EST	Winter Weather Advisory	PBZ	51 hr
Nov 20, 5:07 PM EST	Special Weather Statement	PBZ	113 min
Nov 20, 5:20 PM EST	Severe Thunderstorm Warning	PBZ	55 min
Nov 22, 1:56 PM EST	Mesoscale Discussion	SPC	4 hr
Nov 29, 6:14 AM EST	Special Weather Statement	PBZ	46 min
Nov 29, 6:57 AM EST	Special Weather Statement	PBZ	48 min
Nov 29, 2:47 PM EST	Special Weather Statement	PBZ	58 min
Nov 29, 4:46 PM EST	Special Weather Statement	PBZ	29 min
Dec 3, 3:46 AM EST	Winter Storm Watch	PBZ	25 hr
Dec 3, 2:26 PM EST	Special Weather Statement	PBZ	64 min
Dec 4, 4:18 AM EST	Lake Effect Snow Warning	PBZ	54 hr
Dec 5, 1:47 AM EST	Mesoscale Discussion	SPC	4 hr
Dec 14, 2:39 AM EST	Winter Weather Advisory	PBZ	46 hr
Dec 23, 2:12 AM EST	Winter Weather Advisory	PBZ	41 hr
Dec 28, 1:10 PM EST	Wind Advisory	PBZ	39 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	7
Tornado Watch	3
Mesoscale Discussion	27
Special Weather Statement	29
Flooding
Areal Flood Warning	3
Flash Flood Warning	3
River Flood Warning	1
Flood Watch	3
Areal Flood Advisory	3
Winter
Lake Effect Snow Warning	1
Snow Squall Warning	5
Winter Storm Watch	2
Winter Weather Advisory	8
Heat
Excessive Heat Watch	1
Heat Advisory	1
Cold
Freeze Warning	8
Freeze Watch	3
Frost Advisory	4
Wind Chill Advisory	1
Wind and dust
Wind Advisory	5
Fog and smoke
Dense Fog Advisory	7

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.