Alert archive / Pennsylvania / Lancaster County

Weather alerts in Lancaster County, Pennsylvania, 2024

178 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Lancaster County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts
178
Warnings
33
Watches
25
Advisories
46
Busiest month
August48 alerts
Busiest day
August 3, 202412 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 Lancaster County in 2024 had a tornado report inside them.

Lancaster County, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings211910%4088%19 min
Flash flood warnings220%3100%24 min

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings160100%40%
NWS State College, PA: severe thunderstorm warnings18812534%42274%20 min
NWS State College, PA: flash flood warnings332330%6578%59 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 5, 12:23 PM ESTWinter Weather AdvisoryCTP34 hr
Jan 6, 11:47 AM ESTMesoscale DiscussionSPC5 hr
Jan 6, 4:27 PM ESTMesoscale DiscussionSPC5 hr
Jan 8, 2:14 AM ESTFlood WatchCTP49 hr
Jan 8, 4:08 AM ESTWind AdvisoryCTP62 hr
Jan 9, 6:00 PM ESTAreal Flood AdvisoryCTP3 hr
Jan 9, 9:27 PM ESTAreal Flood WarningCTP7 hr
Jan 10, 7:49 AM ESTRiver Flood WarningCTP9 hr
Jan 12, 4:14 AM ESTWind AdvisoryCTP41 hr
Jan 14, 2:34 AM ESTWind AdvisoryCTP14 hr
Jan 14, 9:58 AM ESTSpecial Weather StatementCTP92 min
Jan 15, 4:01 AM ESTWinter Weather AdvisoryCTP34 hr
Jan 15, 10:59 PM ESTWinter Storm WarningCTP13 hr
Jan 18, 4:25 AM ESTWinter Weather AdvisoryCTP66 hr
Jan 24, 1:31 PM ESTSpecial Weather StatementCTP89 min
Jan 24, 5:45 PM ESTDense Fog AdvisoryCTP16 hr
Jan 25, 10:43 AM ESTDense Fog AdvisoryCTP22 hr
Feb 10, 2:46 PM ESTWinter Storm WatchCTP48 hr
Feb 12, 2:15 PM ESTWinter Weather AdvisoryCTP21 hr
Feb 15, 6:30 PM ESTWinter Storm WatchCTP19 hr
Feb 16, 1:39 PM ESTWinter Storm WarningCTP17 hr
Feb 16, 10:33 PM ESTMesoscale DiscussionSPC4 hr
Feb 27, 2:47 PM ESTWind AdvisoryCTP37 hr
Mar 9, 3:20 AM ESTWind AdvisoryCTP62 hr
Mar 22, 1:02 PM EDTFlood WatchCTP25 hr
Apr 1, 2:08 PM EDTFlood WatchCTP60 hr
Apr 3, 2:09 PM EDTAreal Flood WarningCTP6 hr
Apr 4, 5:59 PM EDTSpecial Weather StatementCTP31 min
Apr 4, 6:00 PM EDTSpecial Weather StatementCTP30 min
Apr 12, 10:25 AM EDTWind AdvisoryCTP32 hr
Apr 15, 3:58 PM EDTSpecial Weather StatementCTP32 min
Apr 15, 4:08 PM EDTSevere Thunderstorm WarningCTP37 min
Apr 21, 11:54 AM EDTFrost AdvisoryCTP20 hr
Apr 22, 9:45 AM EDTFrost AdvisoryCTP22 hr
Apr 25, 1:32 PM EDTFrost AdvisoryCTP18 hr
May 6, 3:00 AM EDTDense Fog AdvisoryCTP7 hr
May 7, 6:25 AM EDTDense Fog AdvisoryCTP3 hr
May 8, 5:46 AM EDTSpecial Weather StatementCTP44 min
May 22, 3:00 PM EDTSevere Thunderstorm WatchSPC5 hr
May 23, 9:13 PM EDTSpecial Weather StatementCTP17 min
May 23, 9:28 PM EDTSpecial Weather StatementCTP17 min
May 23, 9:43 PM EDTSpecial Weather StatementCTP17 min
May 27, 11:53 AM EDTMesoscale DiscussionSPC2 hr
May 27, 1:42 PM EDTSevere Thunderstorm WatchSPC7 hr
May 27, 4:40 PM EDTMesoscale DiscussionSPC95 min
May 27, 7:35 PM EDTSpecial Weather StatementCTP55 min
May 27, 7:40 PM EDTMesoscale DiscussionSPC2 hr
May 27, 8:24 PM EDTTornado WarningCTP36 min
May 29, 5:20 PM EDTSpecial Weather StatementCTP25 min
May 29, 5:23 PM EDTSevere Thunderstorm WarningCTP37 min
Jun 5, 10:12 PM EDTAreal Flood AdvisoryCTP78 min
Jun 6, 12:58 PM EDTMesoscale DiscussionSPC92 min
Jun 14, 2:34 PM EDTMesoscale DiscussionSPC116 min
Jun 14, 4:41 PM EDTSpecial Weather StatementCTP34 min
Jun 16, 3:20 PM EDTHeat AdvisoryCTP7 days
Jun 23, 3:23 PM EDTMesoscale DiscussionSPC2 hr
Jun 23, 4:18 PM EDTSpecial Weather StatementCTP27 min
Jun 23, 4:33 PM EDTSevere Thunderstorm WatchSPC5 hr
Jun 26, 4:02 PM EDTMesoscale DiscussionSPC118 min
Jun 26, 5:21 PM EDTSpecial Weather StatementCTP39 min
Jun 26, 5:31 PM EDTSevere Thunderstorm WarningCTP44 min
Jun 29, 1:11 PM EDTTornado WatchSPC7 hr
Jun 29, 4:09 PM EDTMesoscale DiscussionSPC96 min
Jun 29, 6:38 PM EDTMesoscale DiscussionSPC97 min
Jun 30, 9:55 AM EDTMesoscale DiscussionSPC2 hr
Jun 30, 11:09 AM EDTSevere Thunderstorm WatchSPC10 hr
Jun 30, 2:47 PM EDTSevere Thunderstorm WarningCTP43 min
Jun 30, 3:22 PM EDTSevere Thunderstorm WarningCTP38 min
Jun 30, 4:12 PM EDTSpecial Weather StatementCTP63 min
Jun 30, 4:31 PM EDTSevere Thunderstorm WarningCTP44 min
Jun 30, 5:41 PM EDTMesoscale DiscussionSPC94 min
Jun 30, 6:43 PM EDTSpecial Weather StatementCTP32 min
Jul 5, 2:48 AM EDTHeat AdvisoryCTP41 hr
Jul 7, 2:40 PM EDTHeat AdvisoryCTP3 days
Jul 9, 3:37 PM EDTSpecial Weather StatementCTP38 min
Jul 10, 1:37 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 13, 2:42 AM EDTExcessive Heat WatchCTP35 hr
Jul 13, 2:42 AM EDTHeat AdvisoryCTP4 days
Jul 14, 12:56 PM EDTMesoscale DiscussionSPC3 hr
Jul 14, 1:54 PM EDTExcessive Heat WarningCTP54 hr
Jul 15, 10:56 AM EDTHeat AdvisoryCTP57 hr
Jul 15, 3:41 PM EDTMesoscale DiscussionSPC2 hr
Jul 15, 4:48 PM EDTSevere Thunderstorm WarningCTP27 min
Jul 15, 5:15 PM EDTSpecial Weather StatementCTP45 min
Jul 16, 2:35 PM EDTMesoscale DiscussionSPC115 min
Jul 16, 3:36 PM EDTSevere Thunderstorm WatchSPC9 hr
Jul 16, 4:09 PM EDTSevere Thunderstorm WarningCTP36 min
Jul 16, 4:43 PM EDTSevere Thunderstorm WarningCTP47 min
Jul 16, 6:20 PM EDTMesoscale DiscussionSPC115 min
Jul 16, 6:33 PM EDTSpecial Weather StatementCTP42 min
Jul 16, 6:41 PM EDTSpecial Weather StatementCTP34 min
Jul 16, 6:48 PM EDTSevere Thunderstorm WarningCTP42 min
Jul 16, 7:28 PM EDTSevere Thunderstorm WarningCTP77 min
Jul 16, 8:19 PM EDTMesoscale DiscussionSPC116 min
Jul 16, 8:44 PM EDTSevere Thunderstorm WarningCTP46 min
Jul 16, 9:57 PM EDTSpecial Weather StatementCTP33 min
Jul 17, 12:27 PM EDTMesoscale DiscussionSPC2 hr
Jul 17, 12:58 PM EDTSevere Thunderstorm WatchSPC10 hr
Jul 17, 1:48 PM EDTSpecial Weather StatementCTP27 min
Jul 17, 2:11 PM EDTSevere Thunderstorm WarningCTP34 min
Jul 17, 3:50 PM EDTMesoscale DiscussionSPC115 min
Jul 17, 6:18 PM EDTSevere Thunderstorm WarningCTP42 min
Jul 17, 7:11 PM EDTMesoscale DiscussionSPC2 hr
Jul 21, 10:38 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 22, 2:17 AM EDTAreal Flood AdvisoryCTP2 hr
Jul 24, 3:23 PM EDTSpecial Weather StatementCTP37 min
Jul 30, 12:39 PM EDTMesoscale DiscussionSPC2 hr
Jul 31, 4:17 AM EDTHeat AdvisoryCTP64 hr
Aug 1, 1:57 PM EDTSpecial Weather StatementCTP63 min
Aug 1, 2:53 PM EDTMesoscale DiscussionSPC2 hr
Aug 2, 3:32 PM EDTSpecial Weather StatementCTP28 min
Aug 2, 3:58 PM EDTSpecial Weather StatementCTP17 min
Aug 3, 12:14 PM EDTFlood WatchCTP9 hr
Aug 3, 12:56 PM EDTMesoscale DiscussionSPC94 min
Aug 3, 1:20 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 3, 2:53 PM EDTMesoscale DiscussionSPC67 min
Aug 3, 3:08 PM EDTSpecial Weather StatementCTP37 min
Aug 3, 3:40 PM EDTSpecial Weather StatementCTP50 min
Aug 3, 3:53 PM EDTSevere Thunderstorm WarningCTP37 min
Aug 3, 4:30 PM EDTSpecial Weather StatementCTP30 min
Aug 3, 4:45 PM EDTSpecial Weather StatementCTP30 min
Aug 3, 5:01 PM EDTSevere Thunderstorm WarningCTP44 min
Aug 3, 5:26 PM EDTAreal Flood AdvisoryCTP2 hr
Aug 3, 5:43 PM EDTSpecial Weather StatementCTP32 min
Aug 6, 11:42 AM EDTSevere Thunderstorm WatchSPC7 hr
Aug 6, 2:10 PM EDTMesoscale DiscussionSPC95 min
Aug 6, 2:35 PM EDTSpecial Weather StatementCTP25 min
Aug 6, 2:54 PM EDTFlood WatchCTP13 hr
Aug 6, 3:16 PM EDTAreal Flood AdvisoryCTP119 min
Aug 6, 3:28 PM EDTSpecial Weather StatementCTP32 min
Aug 6, 3:52 PM EDTSevere Thunderstorm WarningCTP38 min
Aug 6, 4:07 PM EDTFlash Flood WarningCTP2 hr
Aug 6, 4:29 PM EDTMesoscale DiscussionSPC61 min
Aug 6, 6:31 PM EDTMesoscale DiscussionSPC89 min
Aug 6, 7:32 PM EDTAreal Flood AdvisoryCTP118 min
Aug 7, 3:24 PM EDTFlood WatchCTP48 hr
Aug 8, 11:04 PM EDTMesoscale DiscussionSPC116 min
Aug 9, 4:38 AM EDTMesoscale DiscussionSPC3 hr
Aug 9, 6:17 AM EDTTornado WatchSPC8 hr
Aug 9, 10:26 AM EDTMesoscale DiscussionSPC94 min
Aug 17, 4:59 AM EDTFlood WatchCTP42 hr
Aug 18, 1:09 PM EDTMesoscale DiscussionSPC96 min
Aug 18, 2:02 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 18, 4:30 PM EDTMesoscale DiscussionSPC90 min
Aug 18, 5:27 PM EDTSpecial Weather StatementCTP33 min
Aug 18, 6:13 PM EDTSpecial Weather StatementCTP32 min
Aug 18, 7:12 PM EDTSpecial Weather StatementCTP33 min
Aug 18, 7:24 PM EDTSpecial Weather StatementCTP21 min
Aug 18, 7:32 PM EDTSevere Thunderstorm WarningCTP58 min
Aug 18, 7:54 PM EDTAreal Flood AdvisoryCTP96 min
Aug 18, 8:18 PM EDTAreal Flood AdvisoryCTP87 min
Aug 18, 8:28 PM EDTSpecial Weather StatementCTP32 min
Aug 18, 8:34 PM EDTSevere Thunderstorm WarningCTP39 min
Aug 18, 8:35 PM EDTFlash Flood WarningCTP2 hr
Aug 27, 4:05 AM EDTHeat AdvisoryCTP40 hr
Aug 29, 5:40 PM EDTMesoscale DiscussionSPC95 min
Sep 21, 10:53 PM EDTSevere Thunderstorm WarningCTP52 min
Sep 21, 11:40 PM EDTSevere Thunderstorm WarningCTP50 min
Sep 22, 12:39 AM EDTAreal Flood AdvisoryCTP81 min
Oct 14, 2:34 PM EDTFrost AdvisoryCTP18 hr
Oct 15, 12:36 PM EDTFrost AdvisoryCTP20 hr
Oct 16, 1:44 PM EDTFrost AdvisoryCTP19 hr
Oct 18, 3:03 PM EDTFrost AdvisoryCTP17 hr
Oct 19, 2:08 PM EDTFrost AdvisoryCTP19 hr
Oct 24, 2:24 PM EDTFrost AdvisoryCTP19 hr
Oct 26, 3:21 AM EDTFreeze WatchCTP24 hr
Oct 26, 10:52 AM EDTFrost AdvisoryCTP22 hr
Oct 27, 2:56 AM EDTFreeze WarningCTP30 hr
Nov 1, 4:09 AM EDTFire Weather WatchCTP6 hr
Nov 1, 9:53 AM EDTRed Flag WarningCTP9 hr
Nov 7, 1:57 PM ESTRed Flag WarningCTP28 hr
Nov 14, 3:16 PM ESTFire Weather WatchCTP43 hr
Nov 20, 11:28 AM ESTWind AdvisoryCTP14 hr
Dec 3, 2:37 PM ESTWind AdvisoryCTP52 hr
Dec 5, 3:55 AM ESTSpecial Weather StatementCTP65 min
Dec 9, 9:44 PM ESTDense Fog AdvisoryCTP11 hr
Dec 23, 4:28 PM ESTWinter Weather AdvisoryCTP27 hr
Dec 28, 5:40 PM ESTDense Fog AdvisoryCTP15 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 archive20232025

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.