Alert archive / Pennsylvania / Mercer County

Weather alerts in Mercer County, Pennsylvania, 2019

156 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Mercer County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts: 156
Warnings: 46
Watches: 16
Advisories: 28
Busiest month: July24 alerts
Busiest day: April 14, 201911 alerts

Over time

By month

Warning verification

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

2 of 5 tornado warnings covering Mercer County in 2019 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 4 minutes after it went out.

Mercer County, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	2	60%	2	50%	4 min
Severe thunderstorm warnings	29	20	31%	36	78%	25 min
Flash flood warnings	7	5	29%	17	88%	38 min

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Pittsburgh, PA: tornado warnings	19	7	63%	16	50%	8 min
NWS Pittsburgh, PA: severe thunderstorm warnings	311	231	26%	611	82%	19 min
NWS Pittsburgh, PA: flash flood warnings	105	80	24%	282	87%	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
Jan 8, 10:38 AM EST	Tornado Warning	PBZ	37 min
Jan 8, 12:40 PM EST	Special Weather Statement	PBZ	35 min
Jan 8, 1:54 PM EST	Mesoscale Discussion	SPC	2 hr
Jan 8, 3:21 PM EST	Winter Weather Advisory	PBZ	45 hr
Jan 8, 4:28 PM EST	Special Weather Statement	PBZ	47 min
Jan 16, 4:45 AM EST	Winter Weather Advisory	PBZ	6 hr
Jan 17, 2:54 PM EST	Winter Storm Watch	PBZ	22 hr
Jan 18, 1:10 PM EST	Winter Storm Warning	PBZ	48 hr
Jan 19, 2:34 PM EST	Mesoscale Discussion	SPC	4 hr
Jan 19, 6:24 PM EST	Mesoscale Discussion	SPC	3 hr
Jan 19, 9:33 PM EST	Mesoscale Discussion	SPC	3 hr
Jan 20, 10:03 AM EST	Wind Chill Advisory	PBZ	27 hr
Jan 22, 6:30 PM EST	Winter Weather Advisory	PBZ	19 hr
Jan 23, 1:10 PM EST	Flood Watch	PBZ	15 hr
Jan 29, 3:36 AM EST	Wind Chill Warning	PBZ	59 hr
Jan 31, 2:45 PM EST	Wind Chill Advisory	PBZ	3 hr
Feb 6, 11:10 AM EST	Flood Watch	PBZ	41 hr
Feb 6, 11:10 PM EST	Dense Fog Advisory	PBZ	11 hr
Feb 10, 3:33 AM EST	Winter Weather Advisory	PBZ	57 hr
Feb 11, 9:54 AM EST	Flood Watch	PBZ	36 hr
Feb 12, 4:16 AM EST	Mesoscale Discussion	SPC	6 hr
Feb 12, 2:19 PM EST	Wind Advisory	PBZ	26 hr
Feb 17, 3:18 AM EST	Winter Weather Advisory	PBZ	22 hr
Feb 19, 3:05 AM EST	Winter Weather Advisory	PBZ	45 hr
Feb 22, 3:35 AM EST	High Wind Watch	PBZ	35 hr
Feb 23, 2:34 PM EST	High Wind Warning	PBZ	43 hr
Feb 24, 7:45 PM EST	Wind Advisory	PBZ	14 hr
Mar 2, 1:31 PM EST	Winter Weather Advisory	PBZ	35 hr
Mar 14, 8:58 PM EDT	Severe Thunderstorm Warning	PBZ	47 min
Apr 1, 1:03 AM EDT	Special Weather Statement	PBZ	3 hr
Apr 1, 1:06 AM EDT	Special Weather Statement	PBZ	3 hr
Apr 14, 3:46 PM EDT	Mesoscale Discussion	SPC	59 min
Apr 14, 4:49 PM EDT	Mesoscale Discussion	SPC	116 min
Apr 14, 5:57 PM EDT	Mesoscale Discussion	SPC	63 min
Apr 14, 6:31 PM EDT	Severe Thunderstorm Warning	PBZ	44 min
Apr 14, 6:43 PM EDT	Severe Thunderstorm Warning	PBZ	47 min
Apr 14, 6:46 PM EDT	Tornado Watch	SPC	8 hr
Apr 14, 6:59 PM EDT	Severe Thunderstorm Warning	PBZ	46 min
Apr 14, 7:21 PM EDT	Mesoscale Discussion	SPC	54 min
Apr 14, 7:34 PM EDT	Tornado Warning	PBZ	26 min
Apr 14, 7:45 PM EDT	Severe Thunderstorm Warning	PBZ	30 min
Apr 14, 7:46 PM EDT	Severe Thunderstorm Warning	PBZ	44 min
Apr 20, 5:47 PM EDT	Special Weather Statement	PBZ	43 min
Apr 23, 11:51 AM EDT	Special Weather Statement	PBZ	24 min
Apr 23, 12:06 PM EDT	Special Weather Statement	PBZ	39 min
May 23, 8:53 AM EDT	Mesoscale Discussion	SPC	2 hr
May 23, 7:10 PM EDT	Mesoscale Discussion	SPC	65 min
May 25, 12:53 PM EDT	Mesoscale Discussion	SPC	2 hr
May 25, 4:50 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
May 25, 6:17 PM EDT	Severe Thunderstorm Warning	PBZ	43 min
May 25, 6:58 PM EDT	Severe Thunderstorm Warning	PBZ	47 min
May 28, 1:02 PM EDT	Mesoscale Discussion	SPC	118 min
May 28, 1:48 PM EDT	Tornado Watch	SPC	8 hr
May 28, 2:15 PM EDT	Severe Thunderstorm Warning	PBZ	45 min
May 28, 3:24 PM EDT	Mesoscale Discussion	SPC	2 hr
May 28, 3:41 PM EDT	Severe Thunderstorm Warning	PBZ	49 min
May 28, 4:32 PM EDT	Severe Thunderstorm Warning	PBZ	43 min
May 28, 4:43 PM EDT	Mesoscale Discussion	SPC	2 hr
May 28, 8:01 PM EDT	Special Weather Statement	PBZ	29 min
May 28, 8:07 PM EDT	Mesoscale Discussion	SPC	113 min
May 29, 12:06 PM EDT	Mesoscale Discussion	SPC	84 min
May 29, 12:56 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 30, 7:02 PM EDT	Special Weather Statement	PBZ	43 min
Jun 1, 4:33 PM EDT	Special Weather Statement	PBZ	27 min
Jun 1, 4:37 PM EDT	Severe Thunderstorm Warning	PBZ	38 min
Jun 1, 5:22 PM EDT	Severe Thunderstorm Warning	PBZ	38 min
Jun 1, 5:53 PM EDT	Mesoscale Discussion	SPC	97 min
Jun 1, 6:27 PM EDT	Special Weather Statement	PBZ	33 min
Jun 1, 6:51 PM EDT	Severe Thunderstorm Warning	PBZ	24 min
Jun 5, 10:49 AM EDT	Special Weather Statement	PBZ	26 min
Jun 5, 4:09 PM EDT	Areal Flood Advisory	PBZ	100 min
Jun 5, 4:22 PM EDT	Flash Flood Warning	PBZ	3 hr
Jun 5, 7:14 PM EDT	Areal Flood Warning	PBZ	6 hr
Jun 16, 2:24 AM EDT	Areal Flood Advisory	PBZ	2 hr
Jun 16, 4:45 PM EDT	Special Weather Statement	PBZ	30 min
Jun 16, 4:59 PM EDT	Tornado Warning	PBZ	31 min
Jun 16, 5:11 PM EDT	Tornado Warning	PBZ	34 min
Jun 16, 5:43 PM EDT	Tornado Warning	PBZ	32 min
Jun 17, 3:38 AM EDT	Flash Flood Watch	PBZ	4 days
Jun 20, 7:54 PM EDT	Areal Flood Advisory	PBZ	3 hr
Jun 24, 3:37 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 2, 12:53 PM EDT	Special Weather Statement	PBZ	37 min
Jul 2, 1:33 PM EDT	Special Weather Statement	PBZ	27 min
Jul 2, 3:10 PM EDT	Mesoscale Discussion	SPC	95 min
Jul 5, 6:06 PM EDT	Flash Flood Warning	PBZ	90 min
Jul 6, 11:30 AM EDT	Flash Flood Watch	PBZ	10 hr
Jul 6, 2:36 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 11, 10:45 AM EDT	Mesoscale Discussion	SPC	90 min
Jul 11, 1:31 PM EDT	Mesoscale Discussion	SPC	89 min
Jul 11, 2:10 PM EDT	Special Weather Statement	PBZ	65 min
Jul 16, 10:47 PM EDT	Severe Thunderstorm Warning	PBZ	43 min
Jul 17, 3:21 PM EDT	Excessive Heat Watch	PBZ	24 hr
Jul 18, 3:26 PM EDT	Heat Advisory	PBZ	53 hr
Jul 19, 2:29 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 19, 4:40 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 20, 2:54 AM EDT	Flash Flood Warning	PBZ	2 hr
Jul 20, 4:57 AM EDT	Areal Flood Warning	PBZ	3 hr
Jul 20, 7:47 AM EDT	Special Weather Statement	PBZ	28 min
Jul 20, 7:58 AM EDT	Severe Thunderstorm Warning	PBZ	32 min
Jul 20, 8:12 AM EDT	Flash Flood Warning	PBZ	112 min
Jul 20, 7:11 PM EDT	Special Weather Statement	PBZ	49 min
Jul 21, 6:14 PM EDT	Severe Thunderstorm Warning	PBZ	31 min
Jul 24, 2:06 PM EDT	Special Weather Statement	PBZ	24 min
Jul 31, 3:17 PM EDT	Special Weather Statement	PBZ	58 min
Jul 31, 3:43 PM EDT	Special Weather Statement	PBZ	32 min
Aug 5, 5:48 PM EDT	Special Weather Statement	PBZ	42 min
Aug 5, 6:34 PM EDT	Flash Flood Warning	PBZ	98 min
Aug 6, 4:04 PM EDT	Severe Thunderstorm Warning	PBZ	41 min
Aug 6, 5:08 PM EDT	Special Weather Statement	PBZ	52 min
Aug 6, 5:40 PM EDT	Areal Flood Advisory	PBZ	3 hr
Aug 8, 12:37 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 15, 1:15 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 15, 2:02 PM EDT	Severe Thunderstorm Warning	PBZ	43 min
Aug 15, 2:36 PM EDT	Severe Thunderstorm Warning	PBZ	27 min
Aug 15, 5:00 PM EDT	Severe Thunderstorm Warning	PBZ	32 min
Aug 15, 6:18 PM EDT	Severe Thunderstorm Warning	PBZ	27 min
Aug 17, 3:31 PM EDT	Severe Thunderstorm Warning	PBZ	44 min
Aug 17, 4:03 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 17, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	47 min
Aug 18, 4:58 PM EDT	Special Weather Statement	PBZ	32 min
Aug 18, 5:34 PM EDT	Special Weather Statement	PBZ	26 min
Aug 18, 5:38 PM EDT	Severe Thunderstorm Warning	PBZ	52 min
Aug 18, 5:47 PM EDT	Areal Flood Advisory	PBZ	3 hr
Aug 18, 6:10 PM EDT	Flash Flood Warning	PBZ	90 min
Aug 18, 7:27 PM EDT	Special Weather Statement	PBZ	33 min
Aug 18, 7:55 PM EDT	Special Weather Statement	PBZ	35 min
Aug 19, 1:37 AM EDT	Special Weather Statement	PBZ	53 min
Aug 19, 1:39 AM EDT	Severe Thunderstorm Warning	PBZ	36 min
Aug 20, 9:09 PM EDT	Special Weather Statement	PBZ	51 min
Sep 1, 7:26 PM EDT	Mesoscale Discussion	SPC	94 min
Sep 1, 8:26 PM EDT	Severe Thunderstorm Warning	PBZ	49 min
Sep 1, 9:24 PM EDT	Flash Flood Warning	PBZ	3 hr
Sep 11, 3:08 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 11, 3:45 PM EDT	Special Weather Statement	PBZ	30 min
Sep 11, 4:00 PM EDT	Severe Thunderstorm Warning	PBZ	45 min
Sep 11, 4:10 PM EDT	Special Weather Statement	PBZ	35 min
Sep 11, 4:39 PM EDT	Special Weather Statement	PBZ	36 min
Sep 11, 7:12 PM EDT	Special Weather Statement	PBZ	33 min
Sep 13, 11:23 PM EDT	Special Weather Statement	PBZ	52 min
Sep 13, 11:38 PM EDT	Severe Thunderstorm Warning	PBZ	37 min
Sep 14, 12:43 AM EDT	Areal Flood Advisory	PBZ	2 hr
Sep 14, 12:49 AM EDT	Special Weather Statement	PBZ	41 min
Oct 8, 12:13 AM EDT	Dense Fog Advisory	PBZ	10 hr
Oct 12, 3:26 AM EDT	Frost Advisory	PBZ	31 hr
Oct 31, 3:17 AM EDT	Wind Advisory	PBZ	31 hr
Nov 11, 3:32 AM EST	Winter Weather Advisory	PBZ	39 hr
Nov 26, 11:37 AM EST	Wind Advisory	PBZ	39 hr
Nov 30, 3:50 AM EST	Winter Weather Advisory	PBZ	36 hr
Dec 16, 3:54 AM EST	Winter Weather Advisory	PBZ	31 hr
Dec 18, 10:51 AM EST	Special Weather Statement	PBZ	54 min
Dec 18, 11:51 AM EST	Special Weather Statement	PBZ	84 min
Dec 18, 12:19 PM EST	Special Weather Statement	PBZ	86 min
Dec 24, 5:10 PM EST	Dense Fog Advisory	PBZ	17 hr
Dec 25, 10:09 AM EST	Dense Fog Advisory	PBZ	111 min
Dec 31, 12:40 PM EST	Special Weather Statement	PBZ	50 min
Dec 31, 1:34 PM EST	Special Weather Statement	PBZ	86 min

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	29
Tornado Warning	5
Severe Thunderstorm Watch	6
Tornado Watch	2
Mesoscale Discussion	26
Special Weather Statement	40
Flooding
Areal Flood Warning	2
Flash Flood Warning	7
Flash Flood Watch	2
Flood Watch	3
Areal Flood Advisory	6
Winter
Winter Storm Warning	1
Winter Storm Watch	1
Winter Weather Advisory	10
Heat
Excessive Heat Watch	1
Heat Advisory	1
Cold
Wind Chill Warning	1
Frost Advisory	1
Wind Chill Advisory	2
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	4
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2018 2020

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.