Alert archive / Pennsylvania / Allegheny County

Weather alerts in Allegheny County, Pennsylvania, 2018

229 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Allegheny County and its neighbors

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

Alerts
229
Warnings
87
Watches
37
Advisories
44
Busiest month
May30 alerts
Busiest day
October 2, 20188 alerts

Over time

By month

Warning verification

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

Allegheny County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings332524%3474%26 min
Flash flood warnings201715%8487%56 min

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Pittsburgh, PA: tornado warnings21481%1443%12 min
NWS Pittsburgh, PA: severe thunderstorm warnings20715426%41680%19 min
NWS Pittsburgh, PA: flash flood warnings795432%20484%62 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.

IssuedProductOfficeLasted
Jan 3, 3:42 PM ESTWind Chill AdvisoryPBZ4 days
Jan 6, 1:18 PM ESTWind Chill AdvisoryPBZ21 hr
Jan 7, 2:08 PM ESTWinter Weather AdvisoryPBZ36 hr
Jan 11, 3:07 AM ESTWinter Storm WatchPBZ12 hr
Jan 11, 12:45 PM ESTFlood WatchPBZ32 hr
Jan 11, 3:06 PM ESTWinter Storm WarningPBZ43 hr
Jan 12, 1:03 AM ESTAreal Flood AdvisoryPBZ8 hr
Jan 12, 1:20 AM ESTAreal Flood WarningPBZ13 hr
Jan 12, 12:16 PM ESTRiver Flood AdvisoryPBZ70 hr
Jan 12, 2:30 PM ESTAreal Flood WarningPBZ3 hr
Jan 12, 5:21 PM ESTAreal Flood WarningPBZ18 hr
Jan 12, 7:04 PM ESTMesoscale DiscussionSPC6 hr
Jan 13, 2:42 AM ESTRiver Flood WarningPBZ14 hr
Jan 13, 7:15 AM ESTRiver Flood WarningPBZ27 hr
Jan 13, 11:19 AM ESTAreal Flood AdvisoryPBZ9 hr
Jan 14, 10:32 AM ESTRiver Flood AdvisoryPBZ36 hr
Jan 23, 2:16 AM ESTSpecial Weather StatementPBZ44 min
Jan 30, 5:21 AM ESTSpecial Weather StatementPBZ54 min
Jan 30, 6:15 AM ESTSpecial Weather StatementPBZ45 min
Jan 30, 7:05 AM ESTSpecial Weather StatementPBZ55 min
Jan 30, 8:22 AM ESTSpecial Weather StatementPBZ53 min
Jan 30, 9:27 AM ESTSpecial Weather StatementPBZ63 min
Jan 30, 10:40 AM ESTSpecial Weather StatementPBZ65 min
Jan 30, 11:57 AM ESTSpecial Weather StatementPBZ63 min
Feb 2, 12:01 PM ESTSpecial Weather StatementPBZ74 min
Feb 4, 10:16 PM ESTSpecial Weather StatementPBZ119 min
Feb 6, 2:56 AM ESTWinter Weather AdvisoryPBZ34 hr
Feb 6, 3:25 PM ESTWinter Storm WarningPBZ24 hr
Feb 7, 5:28 AM ESTMesoscale DiscussionSPC5 hr
Feb 12, 2:16 AM ESTSpecial Weather StatementPBZ59 min
Feb 12, 3:15 AM ESTSpecial Weather StatementPBZ75 min
Feb 12, 4:28 AM ESTSpecial Weather StatementPBZ77 min
Feb 14, 11:45 AM ESTRiver Flood WatchPBZ45 hr
Feb 14, 11:45 AM ESTRiver Flood WatchPBZ45 hr
Feb 14, 11:45 AM ESTRiver Flood WatchPBZ41 hr
Feb 14, 3:23 PM ESTFlood WatchPBZ51 hr
Feb 15, 11:46 AM ESTRiver Flood WatchPBZ21 hr
Feb 15, 5:33 PM ESTAreal Flood WarningPBZ39 hr
Feb 15, 7:19 PM ESTAreal Flood WarningPBZ15 hr
Feb 15, 9:33 PM ESTRiver Flood WarningPBZ53 hr
Feb 16, 7:51 AM ESTRiver Flood WarningPBZ46 hr
Feb 16, 7:51 AM ESTRiver Flood WarningPBZ35 hr
Feb 16, 7:51 AM ESTRiver Flood WarningPBZ26 hr
Feb 16, 10:12 AM ESTAreal Flood WarningPBZ22 hr
Feb 16, 10:50 AM ESTRiver Flood WarningPBZ36 hr
Feb 18, 3:21 AM ESTRiver Flood AdvisoryPBZ12 days
Feb 22, 3:15 AM ESTFlood WatchPBZ3 days
Feb 22, 7:29 AM ESTAreal Flood WarningPBZ9 hr
Feb 22, 11:50 AM ESTRiver Flood WatchPBZ71 hr
Feb 22, 11:50 AM ESTRiver Flood WatchPBZ47 hr
Feb 22, 11:50 AM ESTRiver Flood WatchPBZ71 hr
Feb 22, 11:50 AM ESTRiver Flood WatchPBZ47 hr
Feb 25, 1:08 AM ESTAreal Flood AdvisoryPBZ3 hr
Mar 1, 10:10 AM ESTHigh Wind WatchPBZ5 hr
Mar 1, 10:10 AM ESTHigh Wind WarningPBZ28 hr
Mar 2, 3:25 PM ESTRiver Flood AdvisoryPBZ43 hr
Mar 7, 6:45 AM ESTSpecial Weather StatementPBZ2 hr
Mar 8, 6:35 PM ESTSpecial Weather StatementPBZ55 min
Mar 13, 11:26 AM EDTSpecial Weather StatementPBZ64 min
Mar 13, 12:54 PM EDTSpecial Weather StatementPBZ66 min
Mar 16, 4:21 AM EDTSpecial Weather StatementPBZ54 min
Mar 16, 5:42 AM EDTSpecial Weather StatementPBZ33 min
Mar 19, 3:19 PM EDTWinter Weather AdvisoryPBZ53 hr
Mar 20, 12:06 PM EDTWinter Weather AdvisoryPBZ32 hr
Mar 28, 11:36 PM EDTDense Fog AdvisoryPBZ7 hr
Mar 29, 11:25 AM EDTRiver Flood AdvisoryPBZ68 hr
Mar 31, 1:58 PM EDTRiver Flood AdvisoryPBZ36 hr
Apr 1, 1:32 PM EDTWinter Weather AdvisoryPBZ17 hr
Apr 2, 8:40 PM EDTRiver Flood AdvisoryPBZ4 days
Apr 3, 7:10 AM EDTFlash Flood WatchPBZ19 hr
Apr 3, 1:58 PM EDTWind AdvisoryPBZ30 hr
Apr 3, 6:38 PM EDTMesoscale DiscussionSPC2 hr
Apr 3, 7:57 PM EDTSevere Thunderstorm WarningPBZ48 min
Apr 3, 8:09 PM EDTSevere Thunderstorm WarningPBZ26 min
Apr 3, 8:20 PM EDTAreal Flood AdvisoryPBZ11 hr
Apr 3, 8:29 PM EDTSpecial Weather StatementPBZ46 min
Apr 3, 8:33 PM EDTSevere Thunderstorm WarningPBZ27 min
Apr 12, 7:49 PM EDTFire Weather WatchPBZ14 hr
Apr 13, 9:30 AM EDTRed Flag WarningPBZ11 hr
Apr 13, 10:53 AM EDTRiver Flood WatchPBZ24 hr
Apr 13, 10:53 AM EDTRiver Flood WatchPBZ47 hr
Apr 13, 10:53 AM EDTRiver Flood WatchPBZ47 hr
Apr 14, 2:41 PM EDTFlash Flood WatchPBZ37 hr
Apr 15, 9:36 PM EDTRiver Flood AdvisoryPBZ5 days
Apr 15, 10:10 PM EDTAreal Flood WarningPBZ18 hr
Apr 16, 10:52 AM EDTRiver Flood WarningPBZ35 hr
May 3, 3:13 PM EDTSpecial Weather StatementPBZ32 min
May 4, 2:44 PM EDTSevere Thunderstorm WatchSPC6 hr
May 4, 4:20 PM EDTMesoscale DiscussionSPC55 min
May 4, 5:21 PM EDTSevere Thunderstorm WarningPBZ24 min
May 4, 5:51 PM EDTSevere Thunderstorm WarningPBZ54 min
May 10, 4:37 AM EDTSpecial Weather StatementPBZ23 min
May 10, 1:45 PM EDTSpecial Weather StatementPBZ45 min
May 12, 1:51 PM EDTMesoscale DiscussionSPC2 hr
May 12, 2:47 PM EDTSevere Thunderstorm WatchSPC8 hr
May 12, 3:07 PM EDTSpecial Weather StatementPBZ38 min
May 12, 3:29 PM EDTSevere Thunderstorm WarningPBZ46 min
May 12, 3:54 PM EDTSevere Thunderstorm WarningPBZ51 min
May 12, 5:05 PM EDTMesoscale DiscussionSPC115 min
May 12, 5:30 PM EDTSevere Thunderstorm WarningPBZ45 min
May 13, 8:04 AM EDTSevere Thunderstorm WarningPBZ41 min
May 14, 11:56 AM EDTMesoscale DiscussionSPC64 min
May 14, 12:29 PM EDTSevere Thunderstorm WatchSPC9 hr
May 15, 2:42 AM EDTFlash Flood WatchPBZ20 hr
May 15, 12:26 PM EDTSevere Thunderstorm WatchSPC7 hr
May 16, 7:01 PM EDTAreal Flood AdvisoryPBZ3 hr
May 16, 7:14 PM EDTFlash Flood WarningPBZ3 hr
May 16, 8:23 PM EDTAreal Flood AdvisoryPBZ112 min
May 19, 4:50 PM EDTSpecial Weather StatementPBZ25 min
May 19, 5:12 PM EDTSpecial Weather StatementPBZ33 min
May 19, 5:35 PM EDTSevere Thunderstorm WarningPBZ40 min
May 22, 1:42 PM EDTSevere Thunderstorm WatchSPC7 hr
May 22, 3:48 PM EDTMesoscale DiscussionSPC117 min
May 22, 6:36 PM EDTMesoscale DiscussionSPC114 min
May 22, 6:46 PM EDTSevere Thunderstorm WarningPBZ44 min
May 22, 7:26 PM EDTSevere Thunderstorm WarningPBZ36 min
May 31, 9:04 PM EDTSpecial Weather StatementPBZ26 min
Jun 3, 7:04 PM EDTSpecial Weather StatementPBZ41 min
Jun 5, 2:50 PM EDTSevere Thunderstorm WarningPBZ25 min
Jun 5, 3:03 PM EDTSevere Thunderstorm WarningPBZ27 min
Jun 5, 3:05 PM EDTMesoscale DiscussionSPC2 hr
Jun 5, 5:36 PM EDTSpecial Weather StatementPBZ24 min
Jun 8, 7:56 PM EDTAreal Flood WarningPBZ2 hr
Jun 9, 2:36 PM EDTFlash Flood WatchPBZ9 hr
Jun 10, 6:00 PM EDTFlash Flood WarningPBZ5 hr
Jun 10, 6:41 PM EDTFlash Flood WarningPBZ3 hr
Jun 13, 6:10 PM EDTMesoscale DiscussionSPC95 min
Jun 13, 6:33 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 13, 6:48 PM EDTSevere Thunderstorm WarningPBZ42 min
Jun 13, 7:00 PM EDTSevere Thunderstorm WarningPBZ45 min
Jun 13, 7:45 PM EDTAreal Flood WarningPBZ105 min
Jun 13, 8:20 PM EDTFlash Flood WarningPBZ79 min
Jun 13, 8:43 PM EDTMesoscale DiscussionSPC62 min
Jun 20, 10:53 AM EDTFlash Flood WatchPBZ11 hr
Jun 20, 4:17 PM EDTFlash Flood WarningPBZ88 min
Jun 20, 7:52 PM EDTFlash Flood WarningPBZ6 hr
Jun 20, 9:07 PM EDTFlash Flood WarningPBZ3 hr
Jul 2, 5:41 PM EDTSevere Thunderstorm WarningPBZ49 min
Jul 2, 6:33 PM EDTSevere Thunderstorm WarningPBZ19 min
Jul 2, 6:47 PM EDTFlash Flood WarningPBZ118 min
Jul 2, 6:51 PM EDTFlash Flood WarningPBZ114 min
Jul 2, 7:08 PM EDTSpecial Weather StatementPBZ37 min
Jul 2, 7:10 PM EDTSpecial Weather StatementPBZ35 min
Jul 3, 2:09 PM EDTHeat AdvisoryPBZ29 hr
Jul 4, 7:42 PM EDTSevere Thunderstorm WarningPBZ48 min
Jul 4, 7:49 PM EDTFlash Flood WarningPBZ3 hr
Jul 4, 8:31 PM EDTSpecial Weather StatementPBZ44 min
Jul 4, 8:37 PM EDTFlash Flood WarningPBZ113 min
Jul 4, 10:43 PM EDTAreal Flood AdvisoryPBZ4 hr
Jul 5, 4:10 AM EDTFlash Flood WatchPBZ19 hr
Jul 5, 5:40 AM EDTAreal Flood AdvisoryPBZ94 min
Jul 5, 7:07 AM EDTFlash Flood WarningPBZ3 hr
Jul 15, 5:02 PM EDTAreal Flood AdvisoryPBZ3 hr
Jul 15, 5:13 PM EDTSevere Thunderstorm WarningPBZ47 min
Jul 15, 5:23 PM EDTAreal Flood AdvisoryPBZ3 hr
Jul 15, 6:17 PM EDTSevere Thunderstorm WarningPBZ43 min
Jul 15, 6:53 PM EDTAreal Flood AdvisoryPBZ108 min
Jul 25, 1:28 AM EDTAreal Flood AdvisoryPBZ63 min
Aug 4, 6:55 AM EDTDense Fog AdvisoryPBZ2 hr
Aug 5, 12:49 PM EDTSevere Thunderstorm WarningPBZ12 min
Aug 5, 2:18 PM EDTFlash Flood WarningPBZ117 min
Aug 5, 2:45 PM EDTSevere Thunderstorm WarningPBZ45 min
Aug 5, 3:13 PM EDTFlash Flood WarningPBZ99 min
Aug 5, 3:32 PM EDTAreal Flood AdvisoryPBZ118 min
Aug 5, 4:03 PM EDTSevere Thunderstorm WarningPBZ27 min
Aug 5, 4:33 PM EDTFlash Flood WarningPBZ88 min
Aug 10, 2:04 PM EDTFlash Flood WarningPBZ5 hr
Aug 10, 3:20 PM EDTFlash Flood WarningPBZ3 hr
Aug 10, 4:55 PM EDTFlash Flood WarningPBZ77 min
Aug 13, 12:51 PM EDTSpecial Weather StatementPBZ24 min
Aug 13, 1:08 PM EDTSevere Thunderstorm WarningPBZ22 min
Aug 13, 1:13 PM EDTFlash Flood WarningPBZ2 hr
Aug 13, 1:30 PM EDTSevere Thunderstorm WarningPBZ30 min
Aug 13, 1:40 PM EDTSevere Thunderstorm WarningPBZ13 min
Aug 13, 1:48 PM EDTSevere Thunderstorm WarningPBZ27 min
Aug 13, 1:57 PM EDTMesoscale DiscussionSPC3 hr
Aug 16, 2:53 PM EDTSpecial Weather StatementPBZ37 min
Aug 16, 3:20 PM EDTSpecial Weather StatementPBZ25 min
Aug 16, 3:39 PM EDTSpecial Weather StatementPBZ36 min
Aug 21, 2:16 PM EDTMesoscale DiscussionSPC119 min
Aug 29, 6:52 PM EDTSevere Thunderstorm WarningPBZ53 min
Sep 6, 12:04 PM EDTSpecial Weather StatementPBZ26 min
Sep 8, 3:34 AM EDTFlood WatchPBZ49 hr
Sep 8, 5:37 AM EDTAreal Flood AdvisoryPBZ3 hr
Sep 8, 11:25 AM EDTRiver Flood WatchPBZ36 hr
Sep 8, 11:25 AM EDTRiver Flood WatchPBZ36 hr
Sep 8, 11:25 AM EDTRiver Flood WatchPBZ36 hr
Sep 8, 11:25 AM EDTRiver Flood WatchPBZ36 hr
Sep 8, 11:25 AM EDTRiver Flood WatchPBZ36 hr
Sep 9, 10:40 AM EDTAreal Flood WarningPBZ5 hr
Sep 9, 11:58 AM EDTAreal Flood WarningPBZ3 hr
Sep 9, 3:00 PM EDTAreal Flood WarningPBZ18 hr
Sep 9, 5:12 PM EDTRiver Flood WarningPBZ46 hr
Sep 9, 5:12 PM EDTRiver Flood WarningPBZ50 hr
Sep 9, 5:12 PM EDTRiver Flood WarningPBZ46 hr
Sep 9, 5:12 PM EDTRiver Flood WarningPBZ44 hr
Sep 9, 10:55 PM EDTRiver Flood WarningPBZ39 hr
Sep 10, 11:02 AM EDTAreal Flood WarningPBZ6 hr
Sep 10, 3:43 PM EDTRiver Flood WarningPBZ25 hr
Sep 10, 4:57 PM EDTAreal Flood WarningPBZ18 hr
Sep 11, 11:17 AM EDTRiver Flood AdvisoryPBZ28 hr
Sep 21, 4:32 PM EDTSevere Thunderstorm WatchSPC4 hr
Sep 21, 7:04 PM EDTMesoscale DiscussionSPC116 min
Sep 21, 7:09 PM EDTSevere Thunderstorm WarningPBZ51 min
Sep 21, 7:44 PM EDTSpecial Weather StatementPBZ31 min
Sep 21, 7:58 PM EDTSevere Thunderstorm WarningPBZ47 min
Sep 21, 9:07 PM EDTAreal Flood AdvisoryPBZ3 hr
Sep 25, 11:06 AM EDTRiver Flood AdvisoryPBZ3 days
Sep 27, 10:27 PM EDTRiver Flood AdvisoryPBZ44 hr
Oct 2, 2:26 PM EDTMesoscale DiscussionSPC2 hr
Oct 2, 2:45 PM EDTSevere Thunderstorm WarningPBZ45 min
Oct 2, 2:55 PM EDTTornado WatchSPC8 hr
Oct 2, 3:28 PM EDTSpecial Weather StatementPBZ32 min
Oct 2, 4:25 PM EDTSpecial Weather StatementPBZ35 min
Oct 2, 4:43 PM EDTMesoscale DiscussionSPC2 hr
Oct 2, 4:47 PM EDTSevere Thunderstorm WarningPBZ43 min
Oct 2, 7:24 PM EDTMesoscale DiscussionSPC81 min
Oct 2, 9:25 PM EDTAreal Flood AdvisoryPBZ2 hr
Oct 4, 4:34 PM EDTSpecial Weather StatementPBZ56 min
Oct 4, 5:11 PM EDTFlash Flood WarningPBZ94 min
Oct 4, 6:42 PM EDTAreal Flood WarningPBZ2 hr
Oct 17, 2:12 PM EDTFrost AdvisoryPBZ19 hr
Oct 18, 2:16 PM EDTFrost AdvisoryPBZ19 hr
Nov 1, 11:38 AM EDTRiver Flood AdvisoryPBZ10 hr
Nov 14, 2:47 PM ESTWinter Weather AdvisoryPBZ34 hr
Nov 15, 3:18 AM ESTMesoscale DiscussionSPC6 hr
Nov 29, 6:17 PM ESTWinter Weather AdvisoryPBZ8 hr
Dec 1, 11:31 PM ESTSpecial Weather StatementPBZ29 min
Dec 20, 11:05 AM ESTRiver Flood AdvisoryPBZ3 days

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20172019

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.