Alert archive / Pennsylvania / Lancaster County

Weather alerts in Lancaster County, Pennsylvania, 2023

163 weather alerts in 2023, 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 2023. Tap one for its archive.

Alerts
163
Warnings
40
Watches
27
Advisories
23
Busiest month
July51 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.

0 of 2 tornado warnings covering Lancaster County in 2023 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.

Lancaster County, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings20100%10%
Severe thunderstorm warnings302130%2997%17 min
Flash flood warnings00

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 24, 4:16 AM ESTWinter Weather AdvisoryCTP42 hr
Feb 21, 3:22 AM ESTWind AdvisoryCTP16 hr
Feb 21, 2:22 PM ESTMesoscale DiscussionSPC53 min
Mar 3, 12:41 PM ESTWind AdvisoryCTP26 hr
Mar 13, 2:35 PM EDTWind AdvisoryCTP33 hr
Mar 23, 8:59 PM EDTSpecial Weather StatementCTP16 min
Mar 23, 9:17 PM EDTSpecial Weather StatementCTP13 min
Mar 31, 3:22 PM EDTHigh Wind WarningCTP30 hr
Mar 31, 3:22 PM EDTWind AdvisoryCTP35 hr
Apr 1, 2:27 PM EDTSevere Thunderstorm WatchSPC5 hr
Apr 1, 4:50 PM EDTSevere Thunderstorm WarningCTP40 min
Apr 1, 5:16 PM EDTSevere Thunderstorm WarningCTP74 min
Apr 2, 11:00 AM EDTFrost AdvisoryCTP22 hr
Apr 7, 8:03 PM EDTFreeze WatchCTP7 hr
Apr 8, 3:07 AM EDTFreeze WarningCTP30 hr
Apr 8, 11:50 AM EDTFreeze WatchCTP22 hr
Apr 9, 9:28 AM EDTFreeze WarningCTP24 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, 2:38 PM EDTSevere Thunderstorm WarningCTP37 min
Apr 22, 2:47 PM EDTMesoscale DiscussionSPC118 min
Apr 22, 3:04 PM EDTSevere Thunderstorm WatchSPC5 hr
Apr 22, 3:16 PM EDTSevere Thunderstorm WarningCTP44 min
Apr 22, 3:58 PM EDTSevere Thunderstorm WarningCTP28 min
Apr 23, 12:52 PM EDTFrost AdvisoryCTP19 hr
Apr 24, 2:09 PM EDTFrost AdvisoryCTP19 hr
Apr 26, 3:46 PM EDTSpecial Weather StatementCTP44 min
Apr 30, 8:31 AM EDTFlood WatchCTP11 hr
Apr 30, 8:52 PM EDTAreal Flood AdvisoryCTP2 hr
May 17, 11:05 AM EDTFrost AdvisoryCTP21 hr
Jun 2, 3:02 PM EDTSpecial Weather StatementCTP28 min
Jun 5, 3:30 PM EDTFire Weather WatchCTP17 hr
Jun 6, 8:26 AM EDTRed Flag WarningCTP12 hr
Jun 6, 6:01 PM EDTSpecial Weather StatementCTP29 min
Jun 6, 6:54 PM EDTSpecial Weather StatementCTP51 min
Jun 9, 7:16 PM EDTSpecial Weather StatementCTP44 min
Jun 14, 1:14 PM EDTSpecial Weather StatementCTP31 min
Jun 14, 1:56 PM EDTSevere Thunderstorm WarningCTP16 min
Jun 14, 1:58 PM EDTSevere Thunderstorm WarningCTP17 min
Jun 16, 10:21 AM EDTSpecial Weather StatementCTP39 min
Jun 16, 10:33 AM EDTSevere Thunderstorm WarningCTP42 min
Jun 16, 10:50 AM EDTTornado WarningCTP25 min
Jun 25, 2:55 PM EDTSpecial Weather StatementCTP35 min
Jun 25, 3:29 PM EDTSpecial Weather StatementCTP31 min
Jun 25, 3:54 PM EDTSpecial Weather StatementCTP36 min
Jun 26, 3:49 AM EDTFlood WatchCTP19 hr
Jun 26, 12:36 PM EDTMesoscale DiscussionSPC2 hr
Jun 26, 1:11 PM EDTSevere Thunderstorm WatchSPC11 hr
Jun 26, 8:03 PM EDTMesoscale DiscussionSPC87 min
Jun 26, 8:20 PM EDTSevere Thunderstorm WarningCTP40 min
Jun 27, 12:33 PM EDTSpecial Weather StatementCTP42 min
Jun 27, 1:05 PM EDTSevere Thunderstorm WarningCTP70 min
Jun 27, 3:15 PM EDTSevere Thunderstorm WarningCTP45 min
Jun 27, 3:59 PM EDTSpecial Weather StatementCTP46 min
Jul 2, 3:24 PM EDTMesoscale DiscussionSPC96 min
Jul 2, 4:31 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 2, 6:22 PM EDTSpecial Weather StatementCTP38 min
Jul 2, 7:02 PM EDTSpecial Weather StatementCTP13 min
Jul 2, 7:04 PM EDTTornado WarningCTP16 min
Jul 3, 2:55 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 3, 4:49 PM EDTMesoscale DiscussionSPC116 min
Jul 3, 6:15 PM EDTSpecial Weather StatementCTP30 min
Jul 3, 6:46 PM EDTSpecial Weather StatementCTP29 min
Jul 7, 12:34 PM EDTSpecial Weather StatementCTP26 min
Jul 7, 1:06 PM EDTSpecial Weather StatementCTP24 min
Jul 7, 1:37 PM EDTSpecial Weather StatementCTP23 min
Jul 8, 3:12 PM EDTFlood WatchCTP26 hr
Jul 8, 7:16 PM EDTSpecial Weather StatementCTP29 min
Jul 9, 10:28 AM EDTMesoscale DiscussionSPC92 min
Jul 9, 11:06 AM EDTSevere Thunderstorm WatchSPC9 hr
Jul 9, 1:20 PM EDTMesoscale DiscussionSPC85 min
Jul 9, 2:10 PM EDTAreal Flood AdvisoryCTP111 min
Jul 9, 3:09 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 9, 3:10 PM EDTSevere Thunderstorm WarningCTP20 min
Jul 9, 3:16 PM EDTSpecial Weather StatementCTP29 min
Jul 9, 3:29 PM EDTSevere Thunderstorm WarningCTP31 min
Jul 13, 2:36 PM EDTMesoscale DiscussionSPC2 hr
Jul 13, 7:48 PM EDTSevere Thunderstorm WarningCTP42 min
Jul 14, 2:02 PM EDTMesoscale DiscussionSPC2 hr
Jul 14, 4:25 PM EDTSpecial Weather StatementCTP50 min
Jul 14, 6:16 PM EDTSevere Thunderstorm WarningCTP44 min
Jul 15, 3:50 PM EDTMesoscale DiscussionSPC2 hr
Jul 15, 6:44 PM EDTFlood WatchCTP23 hr
Jul 19, 4:48 PM EDTMesoscale DiscussionSPC87 min
Jul 19, 5:22 PM EDTSpecial Weather StatementCTP38 min
Jul 20, 1:46 PM EDTSpecial Weather StatementCTP14 min
Jul 20, 10:28 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 21, 1:48 AM EDTSevere Thunderstorm WarningCTP72 min
Jul 24, 5:38 AM EDTSpecial Weather StatementCTP67 min
Jul 25, 10:58 AM EDTMesoscale DiscussionSPC2 hr
Jul 25, 12:13 PM EDTSevere Thunderstorm WatchSPC10 hr
Jul 25, 2:41 PM EDTSpecial Weather StatementCTP49 min
Jul 25, 3:08 PM EDTSevere Thunderstorm WarningCTP38 min
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, 4:37 PM EDTSpecial Weather StatementCTP53 min
Jul 27, 4:46 PM EDTMesoscale DiscussionSPC89 min
Jul 27, 5:15 PM EDTSevere Thunderstorm WarningCTP60 min
Jul 28, 6:45 PM EDTSpecial Weather StatementCTP60 min
Jul 28, 7:34 PM EDTSpecial Weather StatementCTP26 min
Jul 28, 7:46 PM EDTSevere Thunderstorm WarningCTP14 min
Jul 29, 1:56 PM EDTMesoscale DiscussionSPC64 min
Jul 29, 2:48 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 29, 4:45 PM EDTMesoscale DiscussionSPC2 hr
Aug 4, 12:10 PM EDTSevere Thunderstorm WatchSPC10 hr
Aug 4, 6:13 PM EDTMesoscale DiscussionSPC2 hr
Aug 7, 8:18 AM EDTMesoscale DiscussionSPC117 min
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 7, 5:30 PM EDTSevere Thunderstorm Warning Considerable damage threatCTP45 min
Aug 7, 6:15 PM EDTSpecial Weather StatementCTP30 min
Aug 12, 3:05 PM EDTSpecial Weather StatementCTP40 min
Aug 12, 5:38 PM EDTMesoscale DiscussionSPC2 hr
Aug 12, 11:49 PM EDTSpecial Weather StatementCTP56 min
Aug 12, 11:59 PM EDTSevere Thunderstorm WarningCTP46 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, 3:06 PM EDTMesoscale DiscussionSPC84 min
Sep 7, 3:42 PM EDTSevere Thunderstorm WarningCTP48 min
Sep 7, 4:22 PM EDTSevere Thunderstorm WarningCTP53 min
Sep 7, 4:48 PM EDTMesoscale DiscussionSPC87 min
Sep 7, 5:11 PM EDTSevere Thunderstorm WarningCTP34 min
Sep 7, 6:13 PM EDTMesoscale DiscussionSPC92 min
Sep 7, 6:44 PM EDTSevere Thunderstorm WarningCTP73 min
Sep 7, 7:51 PM EDTMesoscale DiscussionSPC84 min
Sep 7, 8:08 PM EDTSpecial Weather StatementCTP52 min
Sep 8, 2:46 PM EDTMesoscale DiscussionSPC119 min
Sep 8, 3:11 PM EDTSevere Thunderstorm WatchSPC8 hr
Sep 8, 6:04 PM EDTSpecial Weather StatementCTP26 min
Sep 8, 6:09 PM EDTSevere Thunderstorm WarningCTP35 min
Sep 8, 6:34 PM EDTMesoscale DiscussionSPC86 min
Sep 8, 6:36 PM EDTSpecial Weather StatementCTP24 min
Sep 8, 8:02 PM EDTSevere Thunderstorm WarningCTP43 min
Sep 8, 8:43 PM EDTSevere Thunderstorm WarningCTP47 min
Sep 8, 8:51 PM EDTSevere Thunderstorm WarningCTP24 min
Sep 8, 9:15 PM EDTSevere Thunderstorm WarningCTP45 min
Sep 8, 9:22 PM EDTSpecial Weather StatementCTP23 min
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, 7:24 PM EDTSpecial Weather StatementCTP36 min
Sep 9, 8:08 PM EDTMesoscale DiscussionSPC2 hr
Sep 11, 3:47 PM EDTSpecial Weather StatementCTP28 min
Sep 12, 3:19 PM EDTFlood WatchCTP12 hr
Oct 3, 3:46 AM EDTDense Fog AdvisoryCTP6 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 8, 2:50 PM ESTFlood WatchCTP58 hr
Dec 16, 1:39 PM ESTFlood WatchCTP46 hr
Dec 18, 12:37 AM ESTAreal Flood AdvisoryCTP6 hr
Dec 18, 2:21 AM ESTAreal Flood WarningCTP14 hr
Dec 18, 11:53 AM ESTRiver Flood WarningCTP14 hr
Dec 26, 3:41 AM ESTDense Fog AdvisoryCTP8 hr
Dec 27, 9:31 PM ESTAreal Flood AdvisoryCTP3 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.