Alert archive / Pennsylvania / Lancaster County

Weather alerts in Lancaster County, Pennsylvania, 2022

166 weather alerts in 2022, 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 2022. Tap one for its archive.

Alerts
166
Warnings
29
Watches
21
Advisories
37
Busiest month
July37 alerts
Busiest day
July 2, 20229 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 reports fell inside a warning.

Lancaster County, 2022

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings010%
Severe thunderstorm warnings201620%2789%23 min
Flash flood warnings00

Each office's whole area, 2022

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings40100%40%
NWS State College, PA: severe thunderstorm warnings15210829%27886%21 min
NWS State College, PA: flash flood warnings3167%3100%28 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 1, 3:33 AM ESTDense Fog AdvisoryCTP7 hr
Jan 5, 2:07 PM ESTWinter Weather AdvisoryCTP59 hr
Jan 6, 9:49 PM ESTWinter Storm WarningCTP8 hr
Jan 8, 3:22 AM ESTWinter Weather AdvisoryCTP34 hr
Jan 15, 2:58 PM ESTWinter Weather AdvisoryCTP43 hr
Jan 16, 8:32 PM ESTWind AdvisoryCTP22 hr
Jan 19, 3:16 PM ESTWinter Weather AdvisoryCTP20 hr
Jan 28, 8:34 AM ESTWinter Weather AdvisoryCTP24 hr
Feb 2, 10:45 PM ESTWinter Weather AdvisoryCTP40 hr
Feb 3, 10:35 AM ESTSpecial Weather StatementCTP85 min
Feb 3, 3:26 PM ESTSpecial Weather StatementCTP2 hr
Feb 4, 12:39 AM ESTAreal Flood AdvisoryCTP8 hr
Feb 7, 8:41 PM ESTSpecial Weather StatementCTP4 hr
Feb 12, 11:52 AM ESTWinter Weather AdvisoryCTP22 hr
Feb 17, 3:41 AM ESTWind AdvisoryCTP29 hr
Feb 18, 3:51 AM ESTSpecial Weather StatementCTP54 min
Feb 18, 4:44 AM ESTSpecial Weather StatementCTP46 min
Feb 18, 2:47 PM ESTWind AdvisoryCTP28 hr
Feb 19, 12:43 PM ESTSpecial Weather StatementCTP92 min
Feb 19, 12:58 PM ESTMesoscale DiscussionSPC4 hr
Feb 24, 4:11 AM ESTWinter Weather AdvisoryCTP30 hr
Feb 24, 9:13 PM ESTMesoscale DiscussionSPC5 hr
Mar 7, 4:15 AM ESTWind AdvisoryCTP21 hr
Mar 7, 4:54 PM ESTSevere Thunderstorm WatchSPC4 hr
Mar 7, 7:33 PM ESTSevere Thunderstorm WarningCTP57 min
Mar 7, 7:42 PM ESTMesoscale DiscussionSPC93 min
Mar 11, 4:26 AM ESTWinter Storm WatchCTP7 hr
Mar 11, 4:26 AM ESTWinter Storm WarningCTP37 hr
Mar 12, 1:00 PM ESTSpecial Weather StatementCTP75 min
Mar 12, 5:03 PM ESTWinter Weather AdvisoryCTP8 hr
Mar 18, 12:29 AM EDTDense Fog AdvisoryCTP11 hr
Mar 19, 2:33 PM EDTMesoscale DiscussionSPC3 hr
Mar 19, 7:03 PM EDTSpecial Weather StatementCTP27 min
Mar 19, 7:29 PM EDTSpecial Weather StatementCTP31 min
Mar 28, 12:13 PM EDTSnow Squall WarningCTP77 min
Mar 28, 1:44 PM EDTSnow Squall WarningCTP91 min
Mar 29, 1:38 PM EDTWinter Weather AdvisoryCTP24 hr
Mar 31, 2:01 PM EDTSevere Thunderstorm WatchSPC8 hr
Mar 31, 3:40 PM EDTMesoscale DiscussionSPC2 hr
Mar 31, 6:33 PM EDTSevere Thunderstorm WarningCTP57 min
Mar 31, 7:13 PM EDTMesoscale DiscussionSPC92 min
Mar 31, 7:20 PM EDTSevere Thunderstorm WarningCTP40 min
Mar 31, 7:52 PM EDTSevere Thunderstorm WarningCTP38 min
Mar 31, 8:23 PM EDTSpecial Weather StatementCTP52 min
Mar 31, 8:35 PM EDTSevere Thunderstorm WarningCTP25 min
Mar 31, 9:43 PM EDTMesoscale DiscussionSPC92 min
Mar 31, 10:48 PM EDTSpecial Weather StatementCTP27 min
Mar 31, 11:31 PM EDTSpecial Weather StatementCTP29 min
Apr 9, 9:45 PM EDTFrost AdvisoryCTP35 hr
Apr 14, 2:19 PM EDTMesoscale DiscussionSPC116 min
Apr 16, 3:26 PM EDTFreeze WatchCTP20 hr
Apr 16, 6:01 PM EDTSpecial Weather StatementCTP44 min
Apr 17, 11:47 AM EDTFreeze WarningCTP19 hr
Apr 19, 3:59 AM EDTFreeze WatchCTP10 hr
Apr 27, 11:35 AM EDTFreeze WarningCTP20 hr
Apr 27, 2:26 PM EDTFreeze WatchCTP24 hr
Apr 27, 2:54 PM EDTFire Weather WatchCTP36 hr
Apr 28, 1:58 PM EDTFreeze WarningCTP18 hr
Apr 29, 3:16 AM EDTRed Flag WarningCTP19 hr
May 15, 3:05 PM EDTMesoscale DiscussionSPC85 min
May 16, 9:55 AM EDTSevere Thunderstorm WatchSPC4 hr
May 16, 4:58 PM EDTSpecial Weather StatementCTP32 min
May 20, 10:39 AM EDTMesoscale DiscussionSPC96 min
May 20, 11:35 AM EDTTornado WatchSPC7 hr
May 20, 11:53 AM EDTSpecial Weather StatementCTP37 min
May 20, 12:45 PM EDTSpecial Weather StatementCTP45 min
May 20, 1:14 PM EDTSevere Thunderstorm WarningCTP61 min
May 20, 1:49 PM EDTMesoscale DiscussionSPC86 min
May 20, 1:58 PM EDTSevere Thunderstorm WarningCTP47 min
May 20, 2:33 PM EDTSevere Thunderstorm Warning Considerable damage threatCTP42 min
May 21, 4:00 AM EDTDense Fog AdvisoryCTP4 hr
May 22, 12:20 PM EDTMesoscale DiscussionSPC2 hr
May 22, 1:53 PM EDTSevere Thunderstorm WatchSPC7 hr
May 22, 4:02 PM EDTSevere Thunderstorm WarningCTP43 min
May 22, 4:15 PM EDTMesoscale DiscussionSPC90 min
May 22, 4:20 PM EDTSpecial Weather StatementCTP25 min
May 22, 4:28 PM EDTSevere Thunderstorm WarningCTP32 min
May 22, 5:01 PM EDTSevere Thunderstorm WarningCTP29 min
May 27, 3:48 AM EDTFlood WatchCTP11 hr
May 27, 11:55 AM EDTMesoscale DiscussionSPC95 min
May 27, 12:57 PM EDTSevere Thunderstorm WatchSPC5 hr
May 27, 1:29 PM EDTSpecial Weather StatementCTP46 min
May 27, 1:45 PM EDTSpecial Weather StatementCTP30 min
May 27, 2:02 PM EDTSevere Thunderstorm WarningCTP43 min
Jun 2, 1:04 PM EDTMesoscale DiscussionSPC116 min
Jun 2, 1:53 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 9, 1:39 AM EDTMesoscale DiscussionSPC3 hr
Jun 14, 5:47 AM EDTSpecial Weather StatementCTP43 min
Jun 16, 5:16 AM EDTSpecial Weather StatementCTP44 min
Jun 16, 8:30 AM EDTSpecial Weather StatementCTP30 min
Jun 16, 9:01 AM EDTSpecial Weather StatementCTP14 min
Jun 16, 9:04 AM EDTSevere Thunderstorm WarningCTP26 min
Jun 16, 2:43 PM EDTTornado WatchSPC8 hr
Jun 16, 9:59 PM EDTSevere Thunderstorm WarningCTP46 min
Jul 1, 11:59 AM EDTMesoscale DiscussionSPC3 hr
Jul 1, 1:36 PM EDTSpecial Weather StatementCTP24 min
Jul 1, 2:07 PM EDTSevere Thunderstorm WarningCTP23 min
Jul 1, 2:52 PM EDTSpecial Weather StatementCTP23 min
Jul 1, 2:57 PM EDTSevere Thunderstorm WarningCTP48 min
Jul 1, 3:14 PM EDTSpecial Weather StatementCTP31 min
Jul 1, 3:38 PM EDTMesoscale DiscussionSPC2 hr
Jul 2, 1:16 PM EDTMesoscale DiscussionSPC119 min
Jul 2, 2:58 PM EDTSpecial Weather StatementCTP32 min
Jul 2, 3:02 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 2, 3:07 PM EDTSevere Thunderstorm WarningCTP38 min
Jul 2, 3:42 PM EDTSevere Thunderstorm WarningCTP48 min
Jul 2, 4:47 PM EDTMesoscale DiscussionSPC118 min
Jul 2, 5:04 PM EDTSpecial Weather StatementCTP26 min
Jul 2, 5:35 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 2, 6:09 PM EDTSevere Thunderstorm WarningCTP63 min
Jul 2, 9:47 PM EDTSpecial Weather StatementCTP28 min
Jul 5, 4:05 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 9, 4:17 AM EDTAreal Flood AdvisoryCTP109 min
Jul 12, 11:40 AM EDTMesoscale DiscussionSPC2 hr
Jul 12, 1:26 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 12, 4:02 PM EDTMesoscale DiscussionSPC88 min
Jul 12, 4:33 PM EDTSpecial Weather StatementCTP42 min
Jul 16, 2:48 PM EDTSpecial Weather StatementCTP42 min
Jul 18, 12:18 PM EDTMesoscale DiscussionSPC117 min
Jul 18, 1:47 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 18, 2:09 PM EDTSpecial Weather StatementCTP36 min
Jul 18, 4:32 PM EDTMesoscale DiscussionSPC88 min
Jul 18, 5:11 PM EDTSpecial Weather StatementCTP19 min
Jul 18, 5:33 PM EDTSpecial Weather StatementCTP42 min
Jul 18, 6:38 PM EDTMesoscale DiscussionSPC97 min
Jul 20, 3:19 PM EDTHeat AdvisoryCTP26 hr
Jul 23, 2:01 PM EDTHeat AdvisoryCTP29 hr
Jul 25, 1:46 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 28, 2:56 PM EDTSpecial Weather StatementCTP49 min
Jul 28, 3:32 PM EDTMesoscale DiscussionSPC118 min
Jul 28, 7:16 PM EDTSpecial Weather StatementCTP14 min
Aug 3, 12:37 PM EDTHeat AdvisoryCTP29 hr
Aug 4, 6:11 PM EDTSpecial Weather StatementCTP34 min
Aug 4, 6:16 PM EDTSevere Thunderstorm WarningCTP44 min
Aug 4, 6:30 PM EDTAreal Flood AdvisoryCTP2 hr
Aug 5, 9:03 PM EDTSpecial Weather StatementCTP27 min
Aug 8, 1:42 AM EDTHeat AdvisoryCTP42 hr
Aug 9, 12:43 PM EDTMesoscale DiscussionSPC2 hr
Aug 9, 3:25 PM EDTSpecial Weather StatementCTP50 min
Aug 11, 1:43 AM EDTAreal Flood AdvisoryCTP2 hr
Aug 17, 2:08 PM EDTSpecial Weather StatementCTP37 min
Aug 17, 2:48 PM EDTSpecial Weather StatementCTP27 min
Aug 22, 3:49 PM EDTSpecial Weather StatementCTP41 min
Aug 22, 4:10 PM EDTMesoscale DiscussionSPC3 hr
Aug 22, 4:35 PM EDTSpecial Weather StatementCTP40 min
Aug 22, 5:17 PM EDTAreal Flood AdvisoryCTP112 min
Aug 30, 1:01 PM EDTMesoscale DiscussionSPC119 min
Aug 30, 4:47 PM EDTSpecial Weather StatementCTP58 min
Aug 30, 5:50 PM EDTMesoscale DiscussionSPC115 min
Sep 5, 3:41 AM EDTFlood WatchCTP32 hr
Sep 12, 3:02 AM EDTFlood WatchCTP19 hr
Sep 12, 4:21 PM EDTAreal Flood AdvisoryCTP2 hr
Sep 12, 5:46 PM EDTMesoscale DiscussionSPC119 min
Sep 25, 11:37 AM EDTSevere Thunderstorm WatchSPC6 hr
Oct 8, 11:40 AM EDTFrost AdvisoryCTP20 hr
Oct 18, 1:21 PM EDTFrost AdvisoryCTP20 hr
Oct 19, 2:27 PM EDTFreeze WarningCTP19 hr
Oct 20, 2:40 PM EDTFrost AdvisoryCTP17 hr
Nov 30, 2:22 PM ESTSpecial Weather StatementCTP83 min
Dec 3, 4:14 PM ESTSpecial Weather StatementCTP31 min
Dec 3, 4:51 PM ESTSpecial Weather StatementCTP39 min
Dec 7, 8:23 AM ESTDense Fog AdvisoryCTP3 hr
Dec 14, 4:17 AM ESTWinter Weather AdvisoryCTP56 hr
Dec 15, 3:27 AM ESTMesoscale DiscussionSPC5 hr
Dec 22, 1:03 PM ESTWind Chill AdvisoryCTP60 hr
Dec 23, 4:12 AM ESTWinter Weather 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 archive20212023

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.