Alert archive / Pennsylvania / Perry County

Weather alerts in Perry County, Pennsylvania, 2023

118 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Perry County and its neighbors

Each county as a circle sized by its count in 2023. Tap one for its archive.

Alerts
118
Warnings
28
Watches
18
Advisories
25
Busiest month
July41 alerts
Busiest day
September 7, 202310 alerts

Over time

By month

Warning verification

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

1 of 2 tornado warnings covering Perry County in 2023 had a tornado report inside them.

Perry County, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%0
Severe thunderstorm warnings191332%1275%20 min
Flash flood warnings110%0

Each office's whole area, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings18572%1540%3 min
NWS State College, PA: severe thunderstorm warnings18613627%38183%19 min
NWS State College, PA: flash flood warnings8363%863%42 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, 11:19 PM ESTDense Fog AdvisoryCTP12 hr
Jan 21, 2:13 PM ESTWinter Weather AdvisoryCTP43 hr
Jan 24, 4:16 AM ESTWinter Weather AdvisoryCTP42 hr
Jan 27, 8:45 AM ESTSpecial Weather StatementCTP60 min
Feb 21, 3:22 AM ESTWind AdvisoryCTP16 hr
Mar 3, 12:41 PM ESTWind AdvisoryCTP26 hr
Mar 7, 6:58 AM ESTSpecial Weather StatementCTP62 min
Mar 29, 8:36 PM EDTSpecial Weather StatementCTP54 min
Mar 31, 3:22 PM EDTHigh Wind WarningCTP30 hr
Mar 31, 3:22 PM EDTWind AdvisoryCTP35 hr
Apr 1, 2:02 PM EDTMesoscale DiscussionSPC118 min
Apr 1, 2:27 PM EDTSevere Thunderstorm WatchSPC5 hr
Apr 11, 3:49 PM EDTFire Weather WatchCTP17 hr
Apr 12, 8:54 AM EDTRed Flag WarningCTP11 hr
Apr 16, 7:41 AM EDTDense Fog AdvisoryCTP2 hr
Apr 22, 2:47 PM EDTMesoscale DiscussionSPC118 min
Apr 23, 12:52 PM EDTFrost AdvisoryCTP19 hr
Apr 24, 2:09 PM EDTFreeze WarningCTP19 hr
Apr 30, 8:31 AM EDTFlood WatchCTP11 hr
May 14, 4:27 AM EDTDense Fog AdvisoryCTP5 hr
May 17, 11:05 AM EDTFrost AdvisoryCTP21 hr
Jun 3, 1:27 PM EDTMesoscale DiscussionSPC2 hr
Jun 3, 3:29 PM EDTSevere Thunderstorm WarningCTP46 min
Jun 3, 3:58 PM EDTSevere Thunderstorm WarningCTP47 min
Jun 3, 4:36 PM EDTSevere Thunderstorm WarningCTP39 min
Jun 3, 5:23 PM EDTSevere Thunderstorm WarningCTP37 min
Jun 3, 5:58 PM EDTSevere Thunderstorm WarningCTP28 min
Jun 5, 3:30 PM EDTFire Weather WatchCTP17 hr
Jun 6, 8:26 AM EDTRed Flag WarningCTP12 hr
Jun 6, 1:02 PM EDTSpecial Weather StatementCTP43 min
Jun 6, 1:10 PM EDTMesoscale DiscussionSPC2 hr
Jun 6, 3:56 PM EDTSpecial Weather StatementCTP49 min
Jun 6, 3:57 PM EDTSpecial Weather StatementCTP48 min
Jun 26, 12:36 PM EDTMesoscale DiscussionSPC2 hr
Jun 26, 1:11 PM EDTSevere Thunderstorm WatchSPC11 hr
Jun 26, 4:30 PM EDTMesoscale DiscussionSPC90 min
Jun 26, 8:03 PM EDTMesoscale DiscussionSPC87 min
Jul 1, 1:54 PM EDTMesoscale DiscussionSPC2 hr
Jul 2, 3:05 PM EDTSpecial Weather StatementCTP25 min
Jul 2, 3:12 PM EDTTornado WarningCTP33 min
Jul 2, 3:24 PM EDTMesoscale DiscussionSPC96 min
Jul 2, 3:43 PM EDTTornado WarningCTP32 min
Jul 3, 2:55 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 7, 5:19 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 8, 3:12 PM EDTFlood WatchCTP26 hr
Jul 9, 9:53 AM EDTSpecial Weather StatementCTP52 min
Jul 9, 10:03 AM EDTSevere Thunderstorm WarningCTP57 min
Jul 9, 10:28 AM EDTMesoscale DiscussionSPC92 min
Jul 9, 10:39 AM EDTSevere Thunderstorm WarningCTP51 min
Jul 9, 11:06 AM EDTSevere Thunderstorm WatchSPC9 hr
Jul 9, 11:08 AM EDTAreal Flood AdvisoryCTP3 hr
Jul 9, 11:36 AM EDTFlash Flood WarningCTP4 hr
Jul 9, 1:20 PM EDTMesoscale DiscussionSPC85 min
Jul 9, 3:27 PM EDTAreal Flood WarningCTP3 hr
Jul 13, 2:36 PM EDTMesoscale DiscussionSPC2 hr
Jul 14, 2:02 PM EDTMesoscale DiscussionSPC2 hr
Jul 15, 6:44 PM EDTFlood WatchCTP23 hr
Jul 17, 6:10 PM EDTSpecial Weather StatementCTP50 min
Jul 17, 6:44 PM EDTSpecial Weather StatementCTP46 min
Jul 17, 7:19 PM EDTSevere Thunderstorm WarningCTP41 min
Jul 17, 8:27 PM EDTSpecial Weather StatementCTP33 min
Jul 17, 8:39 PM EDTAreal Flood AdvisoryCTP81 min
Jul 19, 4:48 PM EDTMesoscale DiscussionSPC87 min
Jul 20, 6:19 PM EDTSevere Thunderstorm WatchSPC9 hr
Jul 20, 11:46 PM EDTSevere Thunderstorm WarningCTP74 min
Jul 21, 12:28 AM EDTSpecial Weather StatementCTP77 min
Jul 21, 12:39 AM EDTSevere Thunderstorm WarningCTP51 min
Jul 21, 1:05 AM EDTSevere Thunderstorm WarningCTP40 min
Jul 21, 1:17 AM EDTAreal Flood AdvisoryCTP118 min
Jul 24, 2:23 PM EDTSpecial Weather StatementCTP37 min
Jul 24, 2:59 PM EDTSpecial Weather StatementCTP31 min
Jul 24, 3:40 PM EDTSpecial Weather StatementCTP35 min
Jul 25, 10:58 AM EDTMesoscale DiscussionSPC2 hr
Jul 26, 5:36 AM EDTHeat AdvisoryCTP62 hr
Jul 27, 11:40 AM EDTMesoscale DiscussionSPC2 hr
Jul 27, 3:18 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 27, 4:46 PM EDTMesoscale DiscussionSPC89 min
Jul 28, 4:26 PM EDTSevere Thunderstorm WarningCTP34 min
Aug 4, 11:21 AM EDTMesoscale DiscussionSPC114 min
Aug 4, 12:10 PM EDTSevere Thunderstorm WatchSPC10 hr
Aug 4, 4:19 PM EDTSpecial Weather StatementCTP41 min
Aug 4, 6:13 PM EDTMesoscale DiscussionSPC2 hr
Aug 4, 6:27 PM EDTSevere Thunderstorm WarningCTP48 min
Aug 5, 5:57 AM EDTDense Fog AdvisoryCTP3 hr
Aug 7, 12:14 PM EDTMesoscale DiscussionSPC2 hr
Aug 7, 1:20 PM EDTTornado WatchSPC11 hr
Aug 7, 3:17 PM EDTMesoscale DiscussionSPC88 min
Aug 7, 4:40 PM EDTMesoscale DiscussionSPC95 min
Aug 12, 10:34 PM EDTAreal Flood AdvisoryCTP116 min
Aug 14, 11:59 PM EDTSpecial Weather StatementCTP61 min
Aug 17, 11:04 PM EDTMesoscale DiscussionSPC3 hr
Sep 5, 3:00 PM EDTHeat AdvisoryCTP28 hr
Sep 7, 11:58 AM EDTMesoscale DiscussionSPC3 hr
Sep 7, 1:14 PM EDTSevere Thunderstorm WatchSPC8 hr
Sep 7, 1:18 PM EDTSpecial Weather StatementCTP42 min
Sep 7, 1:21 PM EDTSevere Thunderstorm WarningCTP39 min
Sep 7, 1:48 PM EDTSevere Thunderstorm WarningCTP42 min
Sep 7, 2:15 PM EDTSevere Thunderstorm WarningCTP45 min
Sep 7, 2:32 PM EDTSevere Thunderstorm WarningCTP58 min
Sep 7, 2:55 PM EDTSevere Thunderstorm WarningCTP35 min
Sep 7, 2:59 PM EDTSevere Thunderstorm WarningCTP46 min
Sep 7, 3:06 PM EDTMesoscale DiscussionSPC84 min
Sep 8, 2:46 PM EDTMesoscale DiscussionSPC119 min
Sep 8, 3:11 PM EDTSevere Thunderstorm WatchSPC8 hr
Sep 9, 2:08 PM EDTMesoscale DiscussionSPC3 hr
Sep 9, 4:23 PM EDTSevere Thunderstorm WatchSPC5 hr
Sep 9, 6:06 PM EDTMesoscale DiscussionSPC114 min
Sep 9, 8:08 PM EDTMesoscale DiscussionSPC2 hr
Oct 1, 2:31 AM EDTDense Fog AdvisoryCTP7 hr
Oct 3, 3:46 AM EDTDense Fog AdvisoryCTP6 hr
Oct 4, 2:53 AM EDTDense Fog AdvisoryCTP7 hr
Oct 23, 1:30 PM EDTFrost AdvisoryCTP20 hr
Oct 30, 3:02 AM EDTFrost AdvisoryCTP30 hr
Oct 31, 3:36 AM EDTFreeze WatchCTP23 hr
Nov 1, 2:18 AM EDTFreeze WarningCTP32 hr
Dec 2, 8:05 AM ESTDense Fog AdvisoryCTP115 min
Dec 16, 1:39 PM ESTFlood WatchCTP46 hr
Dec 18, 12:37 AM ESTAreal Flood AdvisoryCTP6 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 archive20222024

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.