Alert archive / Pennsylvania / Jefferson County

Weather alerts in Jefferson County, Pennsylvania, 2008

96 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Jefferson County and its neighbors

Each county as a circle sized by its count in 2008. Tap one for its archive.

Alerts
96
Warnings
26
Watches
14
Advisories
30
Busiest month
June26 alerts
Busiest day
June 16, 200810 alerts

Over time

By month

Warning verification

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

Jefferson County, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings16756%475%21 min
Flash flood warnings10100%0

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 9, 3:50 AM ESTMesoscale DiscussionSPC115 min
Jan 29, 3:02 AM ESTWind AdvisoryPBZ12 hr
Jan 29, 2:47 PM ESTHigh Wind WarningPBZ18 hr
Jan 31, 3:21 PM ESTWinter Storm WarningPBZ26 hr
Feb 1, 7:36 AM ESTMesoscale DiscussionSPC5 hr
Feb 3, 10:47 PM ESTWinter Weather AdvisoryPBZ5 hr
Feb 5, 3:24 AM ESTFlood WatchPBZ37 hr
Feb 5, 12:33 PM ESTRiver Flood WatchPBZ23 hr
Feb 9, 3:59 AM ESTWind AdvisoryPBZ40 hr
Feb 9, 3:35 PM ESTWind Chill AdvisoryPBZ41 hr
Feb 11, 4:07 AM ESTWinter Storm WatchPBZ10 hr
Feb 11, 8:59 AM ESTWind Chill AdvisoryPBZ3 hr
Feb 11, 2:12 PM ESTWinter Storm WarningPBZ37 hr
Feb 12, 1:06 PM ESTMesoscale DiscussionSPC6 hr
Feb 12, 7:41 PM ESTMesoscale DiscussionSPC6 hr
Feb 17, 8:18 AM ESTFreezing Rain AdvisoryPBZ3 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, 3:57 PM ESTFreezing Rain AdvisoryPBZ27 hr
Mar 7, 3:36 AM ESTWinter Storm WarningPBZ39 hr
Mar 8, 6:16 AM ESTMesoscale DiscussionSPC6 hr
Mar 18, 3:54 AM EDTFlood WatchPBZ42 hr
Mar 18, 10:11 PM EDTRiver Flood WatchPBZ35 hr
Mar 21, 3:13 AM EDTSnow AdvisoryPBZ30 hr
Apr 11, 9:23 PM EDTSevere Thunderstorm WarningPBZ35 min
Apr 26, 2:16 PM EDTMesoscale DiscussionSPC59 min
May 28, 5:21 PM EDTFrost AdvisoryPBZ13 hr
May 31, 4:54 PM EDTSevere Thunderstorm WarningPBZ51 min
May 31, 5:34 PM EDTMesoscale DiscussionSPC26 min
Jun 5, 2:34 PM EDTMesoscale DiscussionSPC86 min
Jun 10, 1:25 PM EDTMesoscale DiscussionSPC95 min
Jun 16, 10:19 AM EDTMesoscale DiscussionSPC2 hr
Jun 16, 11:28 AM EDTSevere Thunderstorm WatchSPC10 hr
Jun 16, 1:32 PM EDTSevere Thunderstorm WarningPBZ43 min
Jun 16, 1:43 PM EDTSevere Thunderstorm WarningPBZ62 min
Jun 16, 2:14 PM EDTSevere Thunderstorm WarningPBZ31 min
Jun 16, 2:41 PM EDTSevere Thunderstorm WarningPBZ49 min
Jun 16, 2:41 PM EDTMesoscale DiscussionSPC64 min
Jun 16, 3:29 PM EDTSevere Thunderstorm WarningPBZ31 min
Jun 16, 5:53 PM EDTMesoscale DiscussionSPC67 min
Jun 16, 5:57 PM EDTSevere Thunderstorm WarningPBZ33 min
Jun 22, 2:24 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 23, 2:55 PM EDTMesoscale DiscussionSPC95 min
Jun 26, 7:12 PM EDTSevere Thunderstorm WarningPBZ63 min
Jun 28, 6:06 PM EDTMesoscale DiscussionSPC84 min
Jun 28, 6:31 PM EDTSevere Thunderstorm WatchSPC5 hr
Jun 29, 10:46 AM EDTMesoscale DiscussionSPC119 min
Jun 29, 12:11 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 29, 2:33 PM EDTSevere Thunderstorm WarningPBZ57 min
Jun 29, 2:45 PM EDTSevere Thunderstorm WarningPBZ60 min
Jun 29, 3:01 PM EDTSevere Thunderstorm WarningPBZ59 min
Jun 29, 4:14 PM EDTMesoscale DiscussionSPC91 min
Jun 29, 7:13 PM EDTMesoscale DiscussionSPC92 min
Jun 30, 5:47 PM EDTAreal Flood AdvisoryPBZ3 hr
Jun 30, 6:21 PM EDTFlash Flood WarningPBZ2 hr
Jul 7, 7:16 PM EDTAreal Flood WarningPBZ3 hr
Jul 8, 5:56 PM EDTMesoscale DiscussionSPC64 min
Jul 20, 11:29 AM EDTMesoscale DiscussionSPC61 min
Jul 20, 12:35 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 20, 3:04 PM EDTSevere Thunderstorm WarningPBZ56 min
Jul 22, 7:05 PM EDTSevere Thunderstorm WarningPBZ26 min
Jul 23, 1:28 PM EDTMesoscale DiscussionSPC62 min
Jul 23, 2:00 PM EDTSevere Thunderstorm WarningPBZ60 min
Jul 24, 1:56 PM EDTMesoscale DiscussionSPC2 hr
Jul 26, 4:53 PM EDTMesoscale DiscussionSPC97 min
Aug 7, 2:22 PM EDTSevere Thunderstorm WarningPBZ68 min
Sep 14, 3:46 PM EDTWind AdvisoryPBZ11 hr
Sep 14, 8:02 PM EDTHigh Wind WarningPBZ4 hr
Oct 6, 7:25 AM EDTFrost AdvisoryPBZ26 hr
Oct 17, 3:15 AM EDTFreeze WatchPBZ24 hr
Oct 18, 3:06 AM EDTFreeze WarningPBZ30 hr
Nov 20, 2:54 AM ESTWinter Weather AdvisoryPBZ39 hr
Nov 24, 4:39 PM ESTFreezing Rain AdvisoryPBZ7 hr
Nov 25, 3:01 AM ESTWinter Weather AdvisoryPBZ24 hr
Nov 29, 2:51 PM ESTWinter Weather AdvisoryPBZ34 hr
Dec 6, 3:30 PM ESTWinter Weather AdvisoryPBZ26 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 15, 3:40 AM ESTWinter Storm WatchPBZ24 hr
Dec 16, 3:57 AM ESTWinter Weather AdvisoryPBZ26 hr
Dec 18, 3:08 AM ESTWinter Storm WatchPBZ12 hr
Dec 18, 2:43 PM ESTWinter Storm WarningPBZ24 hr
Dec 19, 7:22 AM ESTMesoscale DiscussionSPC5 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 24, 12:50 AM ESTMesoscale DiscussionSPC6 hr
Dec 24, 6:40 PM ESTAreal Flood AdvisoryPBZ4 hr
Dec 27, 8:07 PM ESTWind AdvisoryPBZ19 hr
Dec 29, 7:49 PM ESTWind AdvisoryPBZ7 hr
Dec 30, 3:14 PM ESTWinter Weather AdvisoryPBZ24 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.