Alert archive / Pennsylvania / Allegheny County

Weather alerts in Allegheny County, Pennsylvania, 2008

118 weather alerts in 2008, 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 2008. Tap one for its archive.

Alerts
118
Warnings
35
Watches
18
Advisories
41
Busiest month
June34 alerts
Busiest day
June 16, 20089 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 1 tornado warnings covering Allegheny County in 2008 had a tornado report inside them.

Allegheny County, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings211814%12100%18 min
Flash flood warnings5340%475%27 min

Each office's whole area, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Pittsburgh, PA: tornado warnings8275%540%11 min
NWS Pittsburgh, PA: severe thunderstorm warnings17910243%16983%23 min
NWS Pittsburgh, PA: flash flood warnings231057%1883%65 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
Dec 31, 9:44 PM ESTSnow and Blowing Snow AdvisoryPBZ29 hr
Jan 8, 2:47 PM ESTWind AdvisoryPBZ16 hr
Jan 29, 3:02 AM ESTWind AdvisoryPBZ12 hr
Jan 29, 2:47 PM ESTHigh Wind WarningPBZ18 hr
Jan 31, 3:21 PM ESTWinter Weather AdvisoryPBZ21 hr
Feb 1, 1:43 AM ESTMesoscale DiscussionSPC5 hr
Feb 1, 11:36 AM ESTAreal Flood AdvisoryPBZ4 hr
Feb 1, 9:53 PM ESTRiver Flood AdvisoryPBZ13 hr
Feb 4, 9:51 PM ESTRiver Flood AdvisoryPBZ55 hr
Feb 5, 3:24 AM ESTFlood WatchPBZ37 hr
Feb 5, 12:33 PM ESTRiver Flood WatchPBZ59 hr
Feb 5, 12:33 PM ESTRiver Flood WatchPBZ68 hr
Feb 6, 6:09 PM ESTMesoscale DiscussionSPC66 min
Feb 7, 4:41 AM ESTRiver Flood WarningPBZ18 hr
Feb 7, 4:41 AM ESTRiver Flood WarningPBZ10 hr
Feb 7, 10:39 PM ESTRiver Flood AdvisoryPBZ30 hr
Feb 9, 3:59 AM ESTWind AdvisoryPBZ40 hr
Feb 9, 3:35 PM ESTWind Chill AdvisoryPBZ41 hr
Feb 11, 2:12 PM ESTWinter Storm WarningPBZ37 hr
Feb 11, 2:12 PM ESTWinter Weather AdvisoryPBZ29 hr
Feb 12, 1:06 PM ESTMesoscale DiscussionSPC6 hr
Feb 12, 7:41 PM ESTMesoscale DiscussionSPC6 hr
Feb 21, 3:15 AM ESTWinter Weather AdvisoryPBZ40 hr
Feb 25, 2:37 PM ESTWinter Weather AdvisoryPBZ37 hr
Feb 29, 6:29 PM ESTHeavy Snow WarningPBZ4 hr
Mar 3, 3:34 AM ESTFlood WatchPBZ45 hr
Mar 3, 11:08 AM ESTRiver Flood WatchPBZ43 hr
Mar 3, 11:08 AM ESTRiver Flood WatchPBZ25 hr
Mar 3, 10:25 PM ESTRiver Flood WatchPBZ14 hr
Mar 4, 11:48 AM ESTAreal Flood AdvisoryPBZ3 hr
Mar 4, 8:24 PM ESTAreal Flood WarningPBZ6 hr
Mar 5, 9:36 PM ESTRiver Flood AdvisoryPBZ30 hr
Mar 7, 3:36 AM ESTWinter Weather AdvisoryPBZ50 hr
Mar 7, 11:22 AM ESTRiver Flood AdvisoryPBZ47 hr
Mar 8, 6:16 AM ESTMesoscale DiscussionSPC6 hr
Mar 18, 3:54 AM EDTFlood WatchPBZ42 hr
Mar 18, 2:31 PM EDTRiver Flood AdvisoryPBZ4 days
Mar 18, 10:11 PM EDTRiver Flood WatchPBZ14 hr
Mar 19, 11:42 AM EDTRiver Flood WatchPBZ11 hr
Apr 29, 3:05 AM EDTFrost AdvisoryPBZ24 hr
May 28, 5:21 PM EDTFrost AdvisoryPBZ13 hr
May 31, 4:10 AM EDTTornado WatchSPC6 hr
May 31, 7:27 AM EDTMesoscale DiscussionSPC2 hr
Jun 10, 1:25 PM EDTMesoscale DiscussionSPC95 min
Jun 13, 8:16 PM EDTMesoscale DiscussionSPC89 min
Jun 13, 9:07 PM EDTSevere Thunderstorm WarningPBZ53 min
Jun 15, 3:11 AM EDTDense Fog AdvisoryPBZ6 hr
Jun 15, 9:08 PM EDTMesoscale DiscussionSPC97 min
Jun 16, 11:28 AM EDTSevere Thunderstorm WatchSPC10 hr
Jun 16, 2:41 PM EDTMesoscale DiscussionSPC64 min
Jun 16, 3:27 PM EDTSevere Thunderstorm WarningPBZ48 min
Jun 16, 3:56 PM EDTSevere Thunderstorm WarningPBZ49 min
Jun 16, 4:22 PM EDTSevere Thunderstorm WarningPBZ23 min
Jun 16, 4:37 PM EDTAreal Flood AdvisoryPBZ3 hr
Jun 16, 5:08 PM EDTFlash Flood WarningPBZ3 hr
Jun 16, 7:04 PM EDTSevere Thunderstorm WarningPBZ41 min
Jun 22, 2:24 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 23, 2:55 PM EDTMesoscale DiscussionSPC95 min
Jun 26, 7:31 PM EDTSevere Thunderstorm WarningPBZ59 min
Jun 26, 8:22 PM EDTSevere Thunderstorm WarningPBZ53 min
Jun 28, 10:39 AM EDTMesoscale DiscussionSPC66 min
Jun 28, 12:59 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 28, 3:52 PM EDTMesoscale DiscussionSPC113 min
Jun 28, 5:52 PM EDTSevere Thunderstorm WarningPBZ53 min
Jun 28, 6:11 PM EDTSevere Thunderstorm WarningPBZ64 min
Jun 28, 6:47 PM EDTMesoscale DiscussionSPC58 min
Jun 28, 6:50 PM EDTSevere Thunderstorm WarningPBZ23 min
Jun 29, 10:46 AM EDTMesoscale DiscussionSPC119 min
Jun 29, 12:11 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 29, 4:14 PM EDTMesoscale DiscussionSPC91 min
Jun 29, 4:57 PM EDTSevere Thunderstorm WarningPBZ48 min
Jun 29, 5:16 PM EDTTornado WarningPBZ29 min
Jun 29, 5:37 PM EDTSevere Thunderstorm WarningPBZ53 min
Jun 29, 7:13 PM EDTMesoscale DiscussionSPC92 min
Jun 29, 7:23 PM EDTSevere Thunderstorm WarningPBZ41 min
Jun 29, 7:55 PM EDTSevere Thunderstorm WarningPBZ65 min
Jun 29, 8:15 PM EDTAreal Flood AdvisoryPBZ77 min
Jul 6, 4:36 PM EDTFlash Flood WarningPBZ49 min
Jul 8, 5:56 PM EDTMesoscale DiscussionSPC64 min
Jul 8, 6:04 PM EDTSevere Thunderstorm WatchSPC2 hr
Jul 8, 6:38 PM EDTSevere Thunderstorm WarningPBZ67 min
Jul 8, 8:19 PM EDTMesoscale DiscussionSPC56 min
Jul 20, 11:29 AM EDTMesoscale DiscussionSPC61 min
Jul 20, 12:35 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 20, 1:13 PM EDTSevere Thunderstorm WarningPBZ62 min
Jul 20, 1:56 PM EDTSevere Thunderstorm WarningPBZ64 min
Jul 20, 2:18 PM EDTSevere Thunderstorm WarningPBZ57 min
Jul 21, 10:28 AM EDTMesoscale DiscussionSPC62 min
Jul 21, 6:33 PM EDTMesoscale DiscussionSPC57 min
Jul 21, 8:12 PM EDTSevere Thunderstorm WarningPBZ63 min
Jul 21, 8:33 PM EDTSevere Thunderstorm WarningPBZ57 min
Jul 23, 1:13 PM EDTFlash Flood WarningPBZ3 hr
Aug 5, 7:32 AM EDTAreal Flood AdvisoryPBZ3 hr
Aug 5, 7:53 AM EDTFlash Flood WarningPBZ3 hr
Aug 14, 3:52 PM EDTSevere Thunderstorm WarningPBZ53 min
Aug 14, 4:27 PM EDTFlash Flood WarningPBZ3 hr
Sep 14, 3:46 PM EDTWind AdvisoryPBZ11 hr
Sep 14, 8:02 PM EDTHigh Wind WarningPBZ4 hr
Oct 18, 3:06 AM EDTFrost AdvisoryPBZ12 hr
Oct 18, 3:06 AM EDTFreeze WarningPBZ30 hr
Nov 20, 2:54 AM ESTWinter Weather AdvisoryPBZ39 hr
Nov 25, 3:01 AM ESTWinter Weather AdvisoryPBZ24 hr
Dec 10, 3:23 PM ESTWinter Weather AdvisoryPBZ36 hr
Dec 11, 12:04 AM ESTMesoscale DiscussionSPC3 hr
Dec 11, 1:52 PM ESTMesoscale DiscussionSPC3 hr
Dec 12, 8:09 AM ESTRiver Flood AdvisoryPBZ26 hr
Dec 15, 3:40 AM ESTWinter Storm WatchPBZ24 hr
Dec 16, 3:57 AM ESTWinter Weather AdvisoryPBZ26 hr
Dec 18, 11:39 AM ESTRiver Flood AdvisoryPBZ9 hr
Dec 18, 2:43 PM ESTWinter Weather AdvisoryPBZ20 hr
Dec 19, 9:15 PM ESTRiver Flood AdvisoryPBZ35 hr
Dec 20, 3:11 PM ESTWinter Weather AdvisoryPBZ18 hr
Dec 21, 2:32 PM ESTWind Chill AdvisoryPBZ21 hr
Dec 23, 4:21 AM ESTWinter Weather AdvisoryPBZ32 hr
Dec 23, 8:55 PM ESTRiver Flood AdvisoryPBZ61 hr
Dec 24, 6:40 PM ESTAreal Flood AdvisoryPBZ4 hr
Dec 27, 8:16 AM ESTRiver Flood AdvisoryPBZ13 hr
Dec 27, 8:07 PM ESTWind AdvisoryPBZ19 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 archive20072009

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.