Alert archive / Pennsylvania / Allegheny County

Weather alerts in Allegheny County, Pennsylvania, 2012

220 weather alerts in 2012, 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 2012. Tap one for its archive.

Alerts
220
Warnings
68
Watches
27
Advisories
31
Busiest month
July79 alerts
Busiest day
July 26, 201216 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 2 tornado reports fell inside a warning.

Allegheny County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings020%
Severe thunderstorm warnings44409%7373%23 min
Flash flood warnings330%2095%56 min

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Pittsburgh, PA: tornado warnings8275%1164%18 min
NWS Pittsburgh, PA: severe thunderstorm warnings20916521%50280%26 min
NWS Pittsburgh, PA: flash flood warnings131023%4680%50 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 1, 3:11 PM ESTWinter Weather AdvisoryPBZ51 hr
Jan 12, 1:24 PM ESTWinter Weather AdvisoryPBZ28 hr
Jan 14, 5:21 PM ESTSpecial Weather StatementPBZ54 min
Jan 14, 6:30 PM ESTSpecial Weather StatementPBZ60 min
Jan 17, 4:00 AM ESTWind AdvisoryPBZ24 hr
Jan 17, 6:16 PM ESTSpecial Weather StatementPBZ59 min
Jan 20, 2:08 AM ESTWinter Storm WarningPBZ34 hr
Jan 21, 12:59 AM ESTMesoscale DiscussionSPC4 hr
Jan 23, 3:26 PM ESTMesoscale DiscussionSPC94 min
Jan 23, 4:12 PM ESTSpecial Weather StatementPBZ33 min
Jan 25, 3:33 PM ESTWinter Weather AdvisoryPBZ18 hr
Jan 26, 10:00 AM ESTFlood WatchPBZ18 hr
Jan 26, 11:05 AM ESTRiver Flood AdvisoryPBZ71 hr
Jan 29, 3:48 AM ESTWind AdvisoryPBZ16 hr
Feb 10, 12:25 PM ESTWinter Weather AdvisoryPBZ48 hr
Feb 23, 8:36 PM ESTWind AdvisoryPBZ24 hr
Feb 24, 1:50 PM ESTWinter Weather AdvisoryPBZ28 hr
Feb 24, 10:17 PM ESTSpecial Weather StatementPBZ58 min
Feb 25, 7:06 PM ESTSpecial Weather StatementPBZ54 min
Feb 29, 4:16 PM ESTRiver Flood AdvisoryPBZ49 hr
Mar 1, 7:29 AM ESTRiver Flood WarningPBZ15 hr
Mar 2, 5:59 PM ESTWind AdvisoryPBZ19 hr
Mar 4, 4:46 PM ESTSpecial Weather StatementPBZ74 min
Mar 4, 6:00 PM ESTSpecial Weather StatementPBZ90 min
Mar 4, 7:29 PM ESTSpecial Weather StatementPBZ31 min
Mar 4, 7:59 PM ESTSpecial Weather StatementPBZ46 min
Mar 4, 9:52 PM ESTSpecial Weather StatementPBZ83 min
Mar 5, 5:47 AM ESTSpecial Weather StatementPBZ118 min
Mar 5, 7:34 AM ESTSpecial Weather StatementPBZ56 min
Mar 5, 8:37 AM ESTSpecial Weather StatementPBZ53 min
Mar 5, 9:49 AM ESTSpecial Weather StatementPBZ56 min
Mar 15, 10:24 PM EDTSpecial Weather StatementPBZ66 min
Mar 15, 11:28 PM EDTSpecial Weather StatementPBZ62 min
Mar 16, 12:30 AM EDTSpecial Weather StatementPBZ60 min
Mar 25, 4:05 AM EDTFreeze WatchPBZ24 hr
Mar 26, 3:39 AM EDTFreeze WarningPBZ30 hr
Mar 28, 9:38 AM EDTSevere Thunderstorm WarningPBZ37 min
Mar 28, 9:49 AM EDTSevere Thunderstorm WarningPBZ41 min
Mar 28, 10:15 AM EDTSevere Thunderstorm WarningPBZ45 min
Mar 28, 10:23 AM EDTMesoscale DiscussionSPC2 hr
Mar 28, 11:23 AM EDTSevere Thunderstorm WarningPBZ52 min
Mar 29, 3:55 AM EDTFreeze WarningPBZ30 hr
Apr 4, 2:09 PM EDTFreeze WatchPBZ25 hr
Apr 4, 2:09 PM EDTFreeze WatchPBZ46 hr
Apr 4, 2:09 PM EDTFreeze WarningPBZ18 hr
Apr 5, 3:25 PM EDTFreeze WarningPBZ18 hr
Apr 6, 11:50 AM EDTFreeze WarningPBZ21 hr
Apr 9, 6:11 PM EDTSpecial Weather StatementPBZ34 min
Apr 9, 6:45 PM EDTSpecial Weather StatementPBZ30 min
Apr 10, 3:46 AM EDTFreeze WatchPBZ12 hr
Apr 10, 3:35 PM EDTFreeze WatchPBZ24 hr
Apr 10, 3:35 PM EDTFreeze WarningPBZ17 hr
Apr 11, 3:39 PM EDTFreeze WatchPBZ23 hr
Apr 11, 3:39 PM EDTFreeze WarningPBZ17 hr
Apr 12, 2:31 PM EDTFreeze WarningPBZ18 hr
Apr 16, 4:06 AM EDTWind AdvisoryPBZ16 hr
Apr 16, 4:31 PM EDTSpecial Weather StatementPBZ29 min
Apr 21, 2:55 PM EDTWinter Storm WatchPBZ24 hr
Apr 22, 2:27 PM EDTWinter Weather AdvisoryPBZ21 hr
Apr 27, 3:25 PM EDTFreeze WarningPBZ16 hr
May 2, 4:56 PM EDTMesoscale DiscussionSPC2 hr
May 7, 1:40 PM EDTMesoscale DiscussionSPC2 hr
May 7, 5:49 PM EDTSpecial Weather StatementPBZ56 min
May 7, 10:11 PM EDTSpecial Weather StatementPBZ34 min
May 8, 7:22 AM EDTFlood WatchPBZ5 hr
May 15, 3:34 AM EDTDense Fog AdvisoryPBZ6 hr
May 21, 6:19 PM EDTSpecial Weather StatementPBZ56 min
May 22, 3:37 PM EDTSpecial Weather StatementPBZ38 min
May 27, 1:33 PM EDTSevere Thunderstorm WatchSPC5 hr
May 27, 1:41 PM EDTMesoscale DiscussionSPC64 min
May 27, 2:14 PM EDTSevere Thunderstorm WarningPBZ46 min
May 27, 4:12 PM EDTMesoscale DiscussionSPC63 min
May 27, 5:01 PM EDTSevere Thunderstorm WarningPBZ59 min
May 27, 5:12 PM EDTSevere Thunderstorm WarningPBZ63 min
May 29, 9:48 AM EDTMesoscale DiscussionSPC87 min
May 29, 10:27 AM EDTSevere Thunderstorm WatchSPC5 hr
May 29, 12:38 PM EDTSpecial Weather StatementPBZ67 min
May 29, 1:14 PM EDTSevere Thunderstorm WarningPBZ46 min
May 29, 1:25 PM EDTMesoscale DiscussionSPC65 min
May 29, 1:27 PM EDTSevere Thunderstorm WarningPBZ33 min
May 29, 6:40 PM EDTSpecial Weather StatementPBZ50 min
Jun 3, 4:44 PM EDTSpecial Weather StatementPBZ46 min
Jun 3, 5:10 PM EDTSpecial Weather StatementPBZ35 min
Jun 3, 5:51 PM EDTSpecial Weather StatementPBZ24 min
Jun 12, 4:37 PM EDTSpecial Weather StatementPBZ38 min
Jun 12, 5:14 PM EDTSpecial Weather StatementPBZ46 min
Jun 28, 3:05 PM EDTHeat AdvisoryPBZ28 hr
Jun 29, 6:34 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 29, 7:15 PM EDTSevere Thunderstorm WarningPBZ60 min
Jun 29, 7:57 PM EDTSpecial Weather StatementPBZ48 min
Jun 29, 8:15 PM EDTSevere Thunderstorm WarningPBZ60 min
Jul 1, 7:22 PM EDTMesoscale DiscussionSPC83 min
Jul 3, 10:20 AM EDTMesoscale DiscussionSPC85 min
Jul 3, 2:33 PM EDTSpecial Weather StatementPBZ57 min
Jul 3, 3:14 PM EDTSevere Thunderstorm WarningPBZ43 min
Jul 4, 12:17 AM EDTSpecial Weather StatementPBZ43 min
Jul 4, 12:18 AM EDTSevere Thunderstorm WarningPBZ57 min
Jul 4, 1:24 AM EDTSpecial Weather StatementPBZ51 min
Jul 4, 2:03 AM EDTSpecial Weather StatementPBZ42 min
Jul 4, 12:07 PM EDTHeat AdvisoryPBZ31 hr
Jul 4, 4:04 PM EDTMesoscale DiscussionSPC56 min
Jul 4, 5:12 PM EDTSevere Thunderstorm WarningPBZ33 min
Jul 4, 5:52 PM EDTSevere Thunderstorm WarningPBZ53 min
Jul 4, 6:44 PM EDTSevere Thunderstorm WarningPBZ28 min
Jul 4, 10:19 PM EDTSevere Thunderstorm WatchSPC4 hr
Jul 4, 11:08 PM EDTSevere Thunderstorm WarningPBZ52 min
Jul 4, 11:44 PM EDTSevere Thunderstorm WarningPBZ46 min
Jul 5, 8:24 AM EDTSpecial Weather StatementPBZ51 min
Jul 5, 3:40 PM EDTHeat AdvisoryPBZ28 hr
Jul 5, 3:40 PM EDTHeat AdvisoryPBZ52 hr
Jul 6, 4:20 AM EDTExcessive Heat WarningPBZ40 hr
Jul 7, 2:16 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 7, 3:53 PM EDTSevere Thunderstorm WarningPBZ52 min
Jul 7, 3:57 PM EDTMesoscale DiscussionSPC2 hr
Jul 7, 5:27 PM EDTSevere Thunderstorm WarningPBZ48 min
Jul 7, 6:59 PM EDTSevere Thunderstorm WatchSPC3 hr
Jul 7, 7:30 PM EDTSevere Thunderstorm WarningPBZ45 min
Jul 7, 8:10 PM EDTSpecial Weather StatementPBZ35 min
Jul 14, 11:13 PM EDTSpecial Weather StatementPBZ47 min
Jul 16, 11:37 PM EDTHeat AdvisoryPBZ20 hr
Jul 18, 12:54 PM EDTMesoscale DiscussionSPC2 hr
Jul 18, 1:00 PM EDTSevere Thunderstorm WarningPBZ60 min
Jul 18, 1:16 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 18, 1:42 PM EDTSpecial Weather StatementPBZ63 min
Jul 18, 1:54 PM EDTSevere Thunderstorm WarningPBZ66 min
Jul 18, 2:02 PM EDTSevere Thunderstorm WarningPBZ58 min
Jul 18, 2:21 PM EDTAreal Flood AdvisoryPBZ3 hr
Jul 18, 2:24 PM EDTSevere Thunderstorm WarningPBZ66 min
Jul 19, 2:39 PM EDTSpecial Weather StatementPBZ66 min
Jul 19, 3:19 PM EDTSevere Thunderstorm WarningPBZ56 min
Jul 19, 3:42 PM EDTAreal Flood AdvisoryPBZ2 hr
Jul 20, 5:21 AM EDTSpecial Weather StatementPBZ54 min
Jul 20, 6:02 AM EDTAreal Flood AdvisoryPBZ3 hr
Jul 20, 1:31 PM EDTAreal Flood AdvisoryPBZ3 hr
Jul 20, 1:57 PM EDTFlash Flood WatchPBZ5 hr
Jul 20, 2:02 PM EDTFlash Flood WarningPBZ5 hr
Jul 24, 7:27 AM EDTSevere Thunderstorm WarningPBZ33 min
Jul 24, 7:35 AM EDTSpecial Weather StatementPBZ25 min
Jul 24, 8:02 AM EDTSevere Thunderstorm WarningPBZ43 min
Jul 24, 8:05 AM EDTSevere Thunderstorm WarningPBZ40 min
Jul 24, 11:48 AM EDTMesoscale DiscussionSPC87 min
Jul 24, 12:31 PM EDTSpecial Weather StatementPBZ29 min
Jul 24, 1:11 PM EDTSpecial Weather StatementPBZ49 min
Jul 25, 12:48 PM EDTHeat AdvisoryPBZ29 hr
Jul 26, 3:31 AM EDTSpecial Weather StatementPBZ59 min
Jul 26, 4:31 AM EDTMesoscale DiscussionSPC89 min
Jul 26, 12:26 PM EDTMesoscale DiscussionSPC2 hr
Jul 26, 1:16 PM EDTSevere Thunderstorm WatchSPC9 hr
Jul 26, 3:09 PM EDTSevere Thunderstorm WarningPBZ66 min
Jul 26, 3:16 PM EDTFlash Flood WatchPBZ6 hr
Jul 26, 3:37 PM EDTSevere Thunderstorm WarningPBZ38 min
Jul 26, 3:37 PM EDTMesoscale DiscussionSPC113 min
Jul 26, 4:02 PM EDTSevere Thunderstorm WarningPBZ58 min
Jul 26, 4:05 PM EDTSevere Thunderstorm WarningPBZ40 min
Jul 26, 4:16 PM EDTSevere Thunderstorm WarningPBZ59 min
Jul 26, 4:19 PM EDTSevere Thunderstorm WarningPBZ41 min
Jul 26, 4:54 PM EDTSevere Thunderstorm WarningPBZ66 min
Jul 26, 6:01 PM EDTSevere Thunderstorm WarningPBZ74 min
Jul 26, 6:06 PM EDTMesoscale DiscussionSPC84 min
Jul 26, 6:49 PM EDTSevere Thunderstorm WarningPBZ56 min
Jul 27, 3:21 PM EDTFlash Flood WatchPBZ13 hr
Jul 27, 8:31 PM EDTAreal Flood WarningPBZ6 hr
Jul 28, 2:57 AM EDTSpecial Weather StatementPBZ48 min
Jul 28, 3:11 PM EDTSpecial Weather StatementPBZ49 min
Jul 28, 4:02 PM EDTSpecial Weather StatementPBZ28 min
Jul 28, 4:10 PM EDTAreal Flood WarningPBZ3 hr
Jul 30, 9:39 PM EDTSpecial Weather StatementPBZ36 min
Jul 30, 9:55 PM EDTSevere Thunderstorm WarningPBZ20 min
Jul 31, 2:30 PM EDTSpecial Weather StatementPBZ30 min
Jul 31, 3:09 PM EDTSevere Thunderstorm WarningPBZ51 min
Aug 5, 5:14 PM EDTSpecial Weather StatementPBZ61 min
Aug 5, 5:52 PM EDTAreal Flood AdvisoryPBZ3 hr
Aug 8, 7:14 PM EDTSevere Thunderstorm WarningPBZ30 min
Aug 9, 4:18 PM EDTMesoscale DiscussionSPC57 min
Aug 9, 4:41 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 9, 8:51 PM EDTSevere Thunderstorm WarningPBZ24 min
Aug 9, 9:18 PM EDTSpecial Weather StatementPBZ27 min
Aug 10, 12:49 PM EDTMesoscale DiscussionSPC86 min
Aug 14, 6:40 PM EDTSpecial Weather StatementPBZ50 min
Sep 1, 2:35 PM EDTSpecial Weather StatementPBZ40 min
Sep 1, 3:00 PM EDTSpecial Weather StatementPBZ30 min
Sep 1, 3:46 PM EDTSpecial Weather StatementPBZ44 min
Sep 1, 4:32 PM EDTFlash Flood WarningPBZ2 hr
Sep 3, 11:25 PM EDTSpecial Weather StatementPBZ65 min
Sep 4, 7:04 PM EDTSpecial Weather StatementPBZ41 min
Sep 7, 6:38 PM EDTMesoscale DiscussionSPC97 min
Sep 8, 4:47 AM EDTSpecial Weather StatementPBZ58 min
Sep 8, 5:00 AM EDTMesoscale DiscussionSPC60 min
Sep 8, 5:48 AM EDTSpecial Weather StatementPBZ57 min
Sep 8, 10:06 AM EDTSpecial Weather StatementPBZ54 min
Sep 22, 12:27 AM EDTSpecial Weather StatementPBZ33 min
Sep 22, 6:31 PM EDTMesoscale DiscussionSPC119 min
Sep 22, 7:02 PM EDTSevere Thunderstorm WarningPBZ43 min
Sep 22, 7:28 PM EDTSevere Thunderstorm WarningPBZ32 min
Sep 23, 3:04 AM EDTFrost AdvisoryPBZ30 hr
Sep 27, 4:54 PM EDTSpecial Weather StatementPBZ36 min
Sep 27, 5:08 PM EDTSpecial Weather StatementPBZ52 min
Sep 27, 5:11 PM EDTSpecial Weather StatementPBZ49 min
Sep 27, 5:17 PM EDTAreal Flood AdvisoryPBZ2 hr
Sep 27, 5:43 PM EDTFlash Flood WarningPBZ85 min
Oct 6, 2:50 PM EDTFreeze WatchPBZ13 hr
Oct 7, 4:16 AM EDTFreeze WarningPBZ29 hr
Oct 8, 11:57 AM EDTFreeze WarningPBZ21 hr
Oct 27, 3:42 PM EDTFlood WatchPBZ58 hr
Oct 27, 3:47 PM EDTHigh Wind WatchPBZ25 hr
Oct 28, 4:21 PM EDTHigh Wind WarningPBZ37 hr
Oct 29, 11:23 AM EDTRiver Flood AdvisoryPBZ47 hr
Oct 29, 11:32 AM EDTRiver Flood WatchPBZ11 hr
Oct 29, 11:32 AM EDTRiver Flood WatchPBZ11 hr
Oct 29, 6:00 PM EDTAreal Flood WarningPBZ18 hr
Oct 29, 10:14 PM EDTRiver Flood WarningPBZ18 hr
Oct 29, 10:14 PM EDTRiver Flood WarningPBZ12 hr
Nov 24, 6:54 AM ESTSpecial Weather StatementPBZ2 hr
Nov 24, 7:00 AM ESTSpecial Weather StatementPBZ2 hr
Dec 20, 1:35 PM ESTWinter Weather AdvisoryPBZ44 hr
Dec 21, 10:29 AM ESTRiver Flood AdvisoryPBZ24 hr
Dec 24, 4:25 PM ESTWinter Storm WatchPBZ23 hr
Dec 25, 4:30 AM ESTWinter Storm WarningPBZ43 hr
Dec 26, 11:40 AM ESTMesoscale DiscussionSPC6 hr
Dec 28, 3:54 AM ESTWinter Weather AdvisoryPBZ57 hr

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 archive20112013

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.