Alert archive / Pennsylvania / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in Pennsylvania, 2018

364 severe thunderstorm warnings in 2018. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.

Severe Thunderstorm Warnings by county

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

Severe Thunderstorm Warnings: 364
Busiest month: May115 severe thunderstorm warnings
Busiest day: October 2, 201835 severe thunderstorm warnings

Over time

By month

Warning verification

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

247 of 364 severe thunderstorm warnings covering Pennsylvania in 2018 had a qualifying storm report inside them; 597 of 763 hail, wind and damage reports fell inside a warning, on average 26 minutes after it went out.

Pennsylvania, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	364	247	32%	763	78%	26 min

Each office's whole area, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Pittsburgh, PA: severe thunderstorm warnings	207	154	26%	416	80%	19 min
NWS Cleveland, OH: severe thunderstorm warnings	84	55	35%	190	55%	21 min
NWS Binghamton, NY: severe thunderstorm warnings	95	47	51%	196	67%	25 min
NWS State College, PA: severe thunderstorm warnings	122	81	34%	244	80%	30 min
NWS Philadelphia/Mount Holly: severe thunderstorm warnings	110	56	49%	277	81%	27 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	Counties	Lasted
Jan 12, 6:05 PM EST	Severe Thunderstorm Warning	CTP	Bedford, Blair, Centre, Huntingdon	55 min
Jan 12, 6:28 PM EST	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin	62 min
Feb 15, 6:48 PM EST	Severe Thunderstorm Warning	PBZ	Fayette	27 min
Apr 3, 7:57 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	48 min
Apr 3, 8:09 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Greene, Washington	26 min
Apr 3, 8:33 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Washington, Westmoreland	27 min
Apr 4, 12:39 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	51 min
Apr 27, 8:26 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield	34 min
Apr 27, 9:02 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton	58 min
May 3, 3:20 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna	40 min
May 3, 3:52 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna	38 min
May 3, 4:27 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland, Snyder, Union	33 min
May 3, 4:47 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana	28 min
May 4, 3:34 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	41 min
May 4, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer	45 min
May 4, 3:50 PM EDT	Severe Thunderstorm Warning	CTP	Warren	55 min
May 4, 3:56 PM EDT	Severe Thunderstorm Warning	CLE	Erie	20 min
May 4, 4:10 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Mercer, Venango	50 min
May 4, 4:26 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Lawrence, Mercer, Venango	34 min
May 4, 4:31 PM EDT	Severe Thunderstorm Warning	CTP	Elk, McKean	89 min
May 4, 5:09 PM EDT	Severe Thunderstorm Warning	CTP	Potter	96 min
May 4, 5:21 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver	24 min
May 4, 5:22 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clearfield, Elk	83 min
May 4, 5:51 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Indiana, Westmoreland	54 min
May 4, 5:54 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	81 min
May 4, 6:00 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Lycoming	90 min
May 4, 6:33 PM EDT	Severe Thunderstorm Warning	CTP	Cambria	72 min
May 4, 6:34 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna	56 min
May 4, 7:06 PM EDT	Severe Thunderstorm Warning	BGM	Susquehanna, Wayne	54 min
May 4, 7:13 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Lackawanna, Luzerne, Susquehanna, Wyoming	62 min
May 4, 7:59 PM EDT	Severe Thunderstorm Warning	BGM	Pike, Susquehanna, Wayne	48 min
May 10, 2:32 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	43 min
May 10, 3:03 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	27 min
May 10, 4:04 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin	56 min
May 10, 4:12 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin	63 min
May 10, 4:37 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Northumberland, Perry, Snyder, Union	53 min
May 10, 4:56 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon	64 min
May 10, 5:11 PM EDT	Severe Thunderstorm Warning	CTP	Adams, York	49 min
May 10, 5:45 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne, Wayne	60 min
May 10, 5:45 PM EDT	Severe Thunderstorm Warning	CTP	York	45 min
May 10, 6:14 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon	61 min
May 10, 6:17 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	43 min
May 10, 6:22 PM EDT	Severe Thunderstorm Warning	BGM	Pike	53 min
May 10, 6:51 PM EDT	Severe Thunderstorm Warning	PHI	Chester	39 min
May 12, 3:23 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Somerset	67 min
May 12, 3:29 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	46 min
May 12, 3:54 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	51 min
May 12, 4:12 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Franklin, Fulton, Huntingdon	63 min
May 12, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	32 min
May 12, 4:16 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	59 min
May 12, 4:19 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Somerset	56 min
May 12, 4:37 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	38 min
May 12, 5:30 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	45 min
May 12, 6:08 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	52 min
May 12, 6:21 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Cambria, Somerset	39 min
May 12, 6:52 PM EDT	Severe Thunderstorm Warning	CTP	Adams, York	53 min
May 12, 6:53 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	37 min
May 12, 7:00 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	45 min
May 12, 7:16 PM EDT	Severe Thunderstorm Warning	PHI	Chester	44 min
May 12, 7:18 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	57 min
May 12, 7:30 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	45 min
May 12, 7:45 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	45 min
May 13, 8:04 AM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Lawrence	41 min
May 13, 4:22 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	38 min
May 13, 4:36 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Somerset	69 min
May 13, 4:53 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	52 min
May 13, 5:44 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Somerset	61 min
May 13, 6:00 PM EDT	Severe Thunderstorm Warning	CTP	Bedford	69 min
May 13, 7:59 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	22 min
May 14, 1:19 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	41 min
May 14, 1:36 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	39 min
May 14, 1:39 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	36 min
May 14, 1:50 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	40 min
May 14, 1:59 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	91 min
May 14, 2:31 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	29 min
May 14, 2:45 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	75 min
May 15, 11:44 AM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	46 min
May 15, 11:56 AM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	34 min
May 15, 12:00 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clearfield, Elk, McKean	75 min
May 15, 12:23 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Jefferson	52 min
May 15, 12:43 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clinton, Elk, Potter	47 min
May 15, 12:45 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Jefferson	45 min
May 15, 12:58 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Cameron, Clearfield, Clinton, Elk	57 min
May 15, 1:14 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	61 min
May 15, 1:20 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	14 min
May 15, 1:42 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield, Clinton, Lycoming	63 min
May 15, 1:52 PM EDT	Severe Thunderstorm Warning	BGM	Bradford	38 min
May 15, 2:10 PM EDT	Severe Thunderstorm Warning	BGM	Susquehanna, Wayne	65 min
May 15, 2:11 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria, Centre, Huntingdon	49 min
May 15, 2:16 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Columbia, Huntingdon, Juniata, Lycoming and 6 more	74 min
May 15, 2:27 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne, Wyoming	48 min
May 15, 2:34 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Huntingdon, Juniata, Mifflin, Perry	56 min
May 15, 3:05 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne, Pike, Wayne	55 min
May 15, 3:14 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Dauphin, Juniata, Northumberland, Perry, Schuylkill and 1 more	46 min
May 15, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	55 min
May 15, 3:34 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin, Perry	41 min
May 15, 3:45 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Franklin, Fulton, Lancaster, Lebanon and 3 more	60 min
May 15, 3:46 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Northampton	74 min
May 15, 3:55 PM EDT	Severe Thunderstorm Warning	BGM	Pike	20 min
May 15, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	33 min
May 15, 4:31 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, York	59 min
May 15, 4:41 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, York	53 min
May 15, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	64 min
May 15, 5:07 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Lancaster, York	83 min
May 15, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Chester	63 min
May 15, 5:22 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	38 min
May 15, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	67 min
May 15, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	52 min
May 15, 6:15 PM EDT	Severe Thunderstorm Warning	PHI	Chester	60 min
May 15, 6:35 PM EDT	Severe Thunderstorm Warning	PHI	Chester	40 min
May 19, 5:35 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Lawrence	40 min
May 19, 6:48 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	27 min
May 22, 3:30 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence, Mercer	20 min
May 22, 5:44 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	46 min
May 22, 6:07 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Washington	53 min
May 22, 6:39 PM EDT	Severe Thunderstorm Warning	BGM	Bradford	33 min
May 22, 6:46 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	44 min
May 22, 7:01 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Washington	30 min
May 22, 7:26 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	36 min
May 28, 4:13 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna	62 min
May 28, 4:52 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna	38 min
May 28, 5:20 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong	40 min
May 28, 5:24 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna, Wyoming	32 min
May 29, 4:01 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	29 min
Jun 3, 3:57 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence, Mercer	48 min
Jun 5, 2:50 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver	25 min
Jun 5, 3:03 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	27 min
Jun 5, 4:57 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	33 min
Jun 8, 7:01 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	25 min
Jun 10, 6:29 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	26 min
Jun 10, 9:13 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene	32 min
Jun 13, 5:44 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler	46 min
Jun 13, 6:05 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Mercer, Venango	34 min
Jun 13, 6:48 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver	42 min
Jun 13, 6:53 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Indiana, Jefferson	52 min
Jun 13, 7:00 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	45 min
Jun 13, 7:31 PM EDT	Severe Thunderstorm Warning	CTP	Potter, Tioga	59 min
Jun 13, 7:41 PM EDT	Severe Thunderstorm Warning	BGM	Bradford	49 min
Jun 13, 8:21 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria	39 min
Jun 13, 8:22 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	68 min
Jun 13, 8:45 PM EDT	Severe Thunderstorm Warning	BGM	Wyoming	60 min
Jun 13, 8:57 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne	33 min
Jun 13, 9:40 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne	50 min
Jun 13, 10:07 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	53 min
Jun 13, 10:56 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	49 min
Jun 13, 11:27 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	33 min
Jun 18, 1:51 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland	54 min
Jun 18, 3:19 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Jefferson	26 min
Jun 18, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Indiana, Jefferson	45 min
Jun 18, 4:29 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Jefferson	16 min
Jun 18, 4:44 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne, Susquehanna, Wayne, Wyoming	46 min
Jun 18, 5:11 PM EDT	Severe Thunderstorm Warning	BGM	Pike, Wayne	49 min
Jun 18, 5:27 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne, Pike, Wayne	63 min
Jun 18, 5:58 PM EDT	Severe Thunderstorm Warning	BGM	Pike	32 min
Jun 18, 6:10 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	50 min
Jun 18, 6:48 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	57 min
Jun 18, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	62 min
Jun 18, 7:30 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	60 min
Jun 18, 7:41 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	64 min
Jun 18, 7:51 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Warren	54 min
Jun 18, 8:20 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Venango	40 min
Jun 18, 8:42 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	48 min
Jun 18, 8:43 PM EDT	Severe Thunderstorm Warning	CTP	Elk	62 min
Jun 18, 9:00 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson, Venango	60 min
Jun 18, 9:27 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson, Mercer, Venango	63 min
Jun 18, 9:57 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Jefferson	33 min
Jun 18, 10:19 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	71 min
Jun 18, 10:26 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Jefferson	34 min
Jun 18, 10:30 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Jefferson	45 min
Jun 24, 5:21 PM EDT	Severe Thunderstorm Warning	CTP	Adams	54 min
Jun 24, 5:44 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Susquehanna, Wayne	46 min
Jun 24, 6:10 PM EDT	Severe Thunderstorm Warning	CTP	York	49 min
Jun 24, 7:32 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	28 min
Jun 28, 12:54 AM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon	50 min
Jul 2, 2:48 PM EDT	Severe Thunderstorm Warning	CTP	Blair	57 min
Jul 2, 3:35 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria	40 min
Jul 2, 3:49 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	26 min
Jul 2, 4:05 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Huntingdon	40 min
Jul 2, 4:07 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Warren	68 min
Jul 2, 4:58 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	36 min
Jul 2, 5:01 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	44 min
Jul 2, 5:11 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	37 min
Jul 2, 5:16 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence	29 min
Jul 2, 5:41 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	49 min
Jul 2, 6:06 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Venango	24 min
Jul 2, 6:33 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Westmoreland	19 min
Jul 2, 7:17 PM EDT	Severe Thunderstorm Warning	BGM	Susquehanna	43 min
Jul 3, 6:18 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	42 min
Jul 3, 6:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	50 min
Jul 3, 6:54 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	51 min
Jul 3, 7:22 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	21 min
Jul 3, 7:39 PM EDT	Severe Thunderstorm Warning	PHI	Chester	51 min
Jul 4, 3:10 PM EDT	Severe Thunderstorm Warning	CTP	Franklin	39 min
Jul 4, 3:40 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Northampton	50 min
Jul 4, 7:42 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	48 min
Jul 4, 9:26 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	34 min
Jul 5, 12:51 PM EDT	Severe Thunderstorm Warning	CTP	Warren	84 min
Jul 5, 1:55 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Mercer, Venango	35 min
Jul 5, 2:00 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	30 min
Jul 5, 2:39 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	36 min
Jul 5, 2:44 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	31 min
Jul 5, 3:34 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Washington	41 min
Jul 5, 5:04 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	56 min
Jul 5, 5:32 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	58 min
Jul 5, 6:09 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	51 min
Jul 14, 7:53 PM EDT	Severe Thunderstorm Warning	BGM	Bradford	52 min
Jul 15, 1:53 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	52 min
Jul 15, 5:13 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	47 min
Jul 15, 6:17 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington, Westmoreland	43 min
Jul 16, 6:46 PM EDT	Severe Thunderstorm Warning	CLE	Crawford	44 min
Jul 16, 8:17 PM EDT	Severe Thunderstorm Warning	CTP	Warren	73 min
Jul 16, 10:04 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	41 min
Jul 16, 10:23 PM EDT	Severe Thunderstorm Warning	BGM	Bradford	52 min
Jul 17, 12:06 PM EDT	Severe Thunderstorm Warning	BGM	Pike	24 min
Jul 22, 6:19 PM EDT	Severe Thunderstorm Warning	BGM	Susquehanna	41 min
Jul 22, 10:07 PM EDT	Severe Thunderstorm Warning	BGM	Susquehanna, Wayne	53 min
Jul 23, 5:08 AM EDT	Severe Thunderstorm Warning	BGM	Luzerne, Wyoming	37 min
Jul 23, 1:23 PM EDT	Severe Thunderstorm Warning	CTP	Centre	52 min
Jul 23, 2:18 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	57 min
Jul 24, 10:19 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, York	56 min
Jul 24, 11:02 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon	58 min
Jul 26, 6:36 PM EDT	Severe Thunderstorm Warning	CLE	Crawford, Erie	54 min
Jul 26, 8:54 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	36 min
Jul 26, 9:30 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	30 min
Jul 27, 2:31 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	29 min
Jul 27, 2:48 PM EDT	Severe Thunderstorm Warning	CTP	Cambria	42 min
Jul 27, 3:11 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	49 min
Jul 27, 3:18 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton	51 min
Jul 27, 6:03 PM EDT	Severe Thunderstorm Warning	PHI	Chester	42 min
Jul 27, 6:06 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	54 min
Jul 27, 6:40 PM EDT	Severe Thunderstorm Warning	PHI	Berks	50 min
Jul 27, 7:06 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	24 min
Jul 27, 7:09 PM EDT	Severe Thunderstorm Warning	PHI	Chester	51 min
Jul 31, 2:34 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington, Westmoreland	41 min
Aug 1, 10:40 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	37 min
Aug 1, 11:35 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	20 min
Aug 3, 1:27 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	48 min
Aug 3, 2:52 PM EDT	Severe Thunderstorm Warning	BGM	Wayne	38 min
Aug 3, 3:26 PM EDT	Severe Thunderstorm Warning	BGM	Wayne	49 min
Aug 4, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	34 min
Aug 5, 12:49 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver	12 min
Aug 5, 2:45 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	45 min
Aug 5, 4:03 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Westmoreland	27 min
Aug 7, 12:58 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	47 min
Aug 7, 1:52 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland, Union	53 min
Aug 7, 1:53 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Susquehanna, Wayne	52 min
Aug 7, 2:43 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland	77 min
Aug 7, 2:55 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Wyoming	50 min
Aug 7, 3:07 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon, Schuylkill	13 min
Aug 7, 4:20 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	39 min
Aug 7, 4:29 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Perry	31 min
Aug 7, 6:40 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	35 min
Aug 8, 8:01 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin	36 min
Aug 11, 1:51 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	39 min
Aug 11, 4:19 PM EDT	Severe Thunderstorm Warning	PHI	Chester	29 min
Aug 12, 6:09 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	20 min
Aug 13, 1:08 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Westmoreland	22 min
Aug 13, 1:23 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	37 min
Aug 13, 1:30 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	30 min
Aug 13, 1:40 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	13 min
Aug 13, 1:48 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Westmoreland	27 min
Aug 13, 2:19 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	26 min
Aug 13, 3:15 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	30 min
Aug 13, 3:33 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Washington	27 min
Aug 13, 3:37 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	23 min
Aug 13, 7:17 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	58 min
Aug 13, 7:42 PM EDT	Severe Thunderstorm Warning	PHI	Chester	48 min
Aug 13, 8:51 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	54 min
Aug 13, 9:00 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	60 min
Aug 13, 9:16 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	44 min
Aug 17, 3:46 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin	59 min
Aug 17, 3:49 PM EDT	Severe Thunderstorm Warning	BGM	Susquehanna, Wayne	41 min
Aug 17, 4:24 PM EDT	Severe Thunderstorm Warning	CTP	Franklin	43 min
Aug 17, 5:59 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	31 min
Aug 17, 6:19 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	41 min
Aug 17, 6:22 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, Schuylkill	53 min
Aug 17, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	38 min
Aug 17, 6:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	52 min
Aug 17, 7:09 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	51 min
Aug 17, 8:17 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	43 min
Aug 21, 1:52 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	38 min
Aug 21, 2:04 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	56 min
Aug 21, 2:16 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	59 min
Aug 21, 2:22 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Somerset	53 min
Aug 21, 3:11 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	34 min
Aug 21, 3:12 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Fulton, Somerset	63 min
Aug 21, 4:15 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Franklin, Fulton, Huntingdon	45 min
Aug 21, 5:36 PM EDT	Severe Thunderstorm Warning	CTP	Warren	54 min
Aug 21, 7:24 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Warren	66 min
Aug 29, 5:18 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	42 min
Aug 29, 5:24 PM EDT	Severe Thunderstorm Warning	CTP	Warren	51 min
Aug 29, 5:51 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence	24 min
Aug 29, 6:02 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Venango	43 min
Aug 29, 6:40 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	35 min
Aug 29, 6:43 PM EDT	Severe Thunderstorm Warning	CTP	Elk	77 min
Aug 29, 6:52 PM EDT	Severe Thunderstorm Warning	CTP	McKean	53 min
Aug 29, 6:52 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	53 min
Aug 29, 6:58 PM EDT	Severe Thunderstorm Warning	CTP	McKean	17 min
Sep 3, 3:23 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	37 min
Sep 3, 4:48 PM EDT	Severe Thunderstorm Warning	CLE	Crawford, Erie	29 min
Sep 3, 7:00 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Union	45 min
Sep 6, 1:40 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne	22 min
Sep 6, 2:17 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna, Wyoming	15 min
Sep 6, 2:46 PM EDT	Severe Thunderstorm Warning	BGM	Bradford	29 min
Sep 6, 3:23 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	29 min
Sep 6, 4:29 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	26 min
Sep 6, 4:32 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	17 min
Sep 17, 3:06 PM EDT	Severe Thunderstorm Warning	CTP	Franklin	39 min
Sep 21, 5:29 PM EDT	Severe Thunderstorm Warning	CTP	Warren	2 hr
Sep 21, 6:30 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield, Elk, McKean, Warren	60 min
Sep 21, 6:32 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Forest, Lawrence, Mercer and 1 more	43 min
Sep 21, 6:36 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence, Washington	39 min
Sep 21, 7:09 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Lawrence	51 min
Sep 21, 7:14 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Forest, Jefferson, Mercer and 1 more	46 min
Sep 21, 7:37 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Elk, McKean, Potter	83 min
Sep 21, 7:58 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	47 min
Sep 21, 8:15 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	45 min
Sep 21, 8:50 PM EDT	Severe Thunderstorm Warning	CTP	Cambria	55 min
Sep 21, 8:58 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Potter, Tioga	47 min
Sep 26, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery	54 min
Sep 26, 7:53 PM EDT	Severe Thunderstorm Warning	PHI	Chester	52 min
Oct 2, 2:45 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	45 min
Oct 2, 3:03 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	42 min
Oct 2, 3:10 PM EDT	Severe Thunderstorm Warning	BGM	Bradford	65 min
Oct 2, 3:11 PM EDT	Severe Thunderstorm Warning	CTP	Warren	79 min
Oct 2, 3:24 PM EDT	Severe Thunderstorm Warning	CTP	Potter, Tioga	96 min
Oct 2, 3:48 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Sullivan	57 min
Oct 2, 4:16 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	13 min
Oct 2, 4:17 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Jefferson	28 min
Oct 2, 4:19 PM EDT	Severe Thunderstorm Warning	CTP	Franklin, Huntingdon	56 min
Oct 2, 4:26 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Luzerne, Susquehanna, Wyoming	49 min
Oct 2, 4:26 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clearfield, Elk	64 min
Oct 2, 4:26 PM EDT	Severe Thunderstorm Warning	CTP	Elk	49 min
Oct 2, 4:33 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Venango	42 min
Oct 2, 4:47 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington, Westmoreland	43 min
Oct 2, 5:03 PM EDT	Severe Thunderstorm Warning	BGM	Luzerne	57 min
Oct 2, 5:03 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	42 min
Oct 2, 5:07 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	38 min
Oct 2, 5:17 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland	58 min
Oct 2, 5:23 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	52 min
Oct 2, 5:24 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Tioga	36 min
Oct 2, 5:26 PM EDT	Severe Thunderstorm Warning	PBZ	Forest	34 min
Oct 2, 5:27 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Centre, Clearfield, Clinton, Elk, Potter	93 min
Oct 2, 5:28 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan	34 min
Oct 2, 5:49 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	26 min
Oct 2, 5:52 PM EDT	Severe Thunderstorm Warning	BGM	Lackawanna, Luzerne, Pike, Wayne	53 min
Oct 2, 5:54 PM EDT	Severe Thunderstorm Warning	BGM	Luzerne	28 min
Oct 2, 5:58 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	47 min
Oct 2, 6:06 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	32 min
Oct 2, 6:18 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	42 min
Oct 2, 6:37 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Union	53 min
Oct 2, 6:39 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Sullivan	21 min
Oct 2, 6:43 PM EDT	Severe Thunderstorm Warning	BGM	Pike, Wayne	32 min
Oct 2, 6:46 PM EDT	Severe Thunderstorm Warning	BGM	Luzerne, Wyoming	44 min
Oct 2, 7:00 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield	90 min
Oct 2, 7:16 PM EDT	Severe Thunderstorm Warning	BGM	Pike	29 min
Oct 2, 8:19 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin, Perry, Snyder	56 min
Oct 2, 8:38 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon, Northumberland, Schuylkill	59 min
Oct 2, 9:01 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria	44 min
Oct 2, 10:43 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	37 min
Oct 6, 6:24 PM EDT	Severe Thunderstorm Warning	PBZ	Venango	36 min
Nov 2, 10:09 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	51 min
Nov 2, 10:53 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more	67 min
Dec 21, 4:15 PM EST	Severe Thunderstorm Warning	CTP	Tioga	45 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

27 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record 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.