Alert archive / Pennsylvania / York County

Weather alerts in York County, Pennsylvania, 2018

217 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

York County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts
217
Warnings
57
Watches
34
Advisories
79
Busiest month
July41 alerts
Busiest day
July 25, 201810 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 1 tornado warnings covering York County in 2018 had a tornado report inside them.

York County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings110%0
Severe thunderstorm warnings10820%2080%24 min
Flash flood warnings161131%18100%72 min

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings22577%1050%7 min
NWS State College, PA: severe thunderstorm warnings1228134%24480%30 min
NWS State College, PA: flash flood warnings573637%8988%96 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, 2:36 PM ESTWinter Weather AdvisoryCTP64 hr
Jan 4, 3:46 AM ESTWind Chill AdvisoryCTP3 days
Jan 7, 2:38 PM ESTWinter Weather AdvisoryCTP40 hr
Jan 12, 4:46 AM ESTWinter Weather AdvisoryCTP29 hr
Jan 14, 7:48 AM ESTFlood WatchCTP23 hr
Jan 15, 2:22 PM ESTWinter Weather AdvisoryCTP41 hr
Jan 18, 12:18 PM ESTFlood WatchCTP11 days
Jan 23, 6:34 AM ESTAreal Flood AdvisoryCTP3 hr
Jan 26, 11:55 AM ESTAreal Flood AdvisoryCTP6 hr
Jan 26, 5:45 PM ESTAreal Flood AdvisoryCTP48 hr
Feb 3, 2:44 PM ESTWinter Weather AdvisoryCTP42 hr
Feb 4, 6:32 PM ESTMesoscale DiscussionSPC4 hr
Feb 6, 3:57 AM ESTWinter Weather AdvisoryCTP38 hr
Feb 11, 12:01 AM ESTDense Fog AdvisoryCTP10 hr
Feb 11, 10:14 AM ESTFlood WatchCTP4 hr
Feb 11, 6:40 PM ESTDense Fog AdvisoryCTP5 hr
Feb 15, 9:26 PM ESTAreal Flood AdvisoryCTP3 hr
Feb 16, 7:14 PM ESTWinter Weather AdvisoryCTP33 hr
Feb 17, 4:32 PM ESTSpecial Weather StatementCTP58 min
Feb 17, 5:40 PM ESTSpecial Weather StatementCTP50 min
Feb 22, 11:29 AM ESTFlood WatchCTP68 hr
Feb 24, 4:12 AM ESTDense Fog AdvisoryCTP6 hr
Mar 1, 3:26 AM ESTHigh Wind WatchCTP13 hr
Mar 1, 4:03 PM ESTHigh Wind WarningCTP30 hr
Mar 1, 4:03 PM ESTWind AdvisoryCTP33 hr
Mar 5, 2:17 PM ESTWinter Storm WatchCTP22 hr
Mar 6, 11:59 AM ESTWinter Storm WarningCTP27 hr
Mar 19, 3:32 PM EDTWinter Storm WatchCTP13 hr
Mar 20, 4:36 AM EDTWinter Storm WarningCTP39 hr
Mar 20, 12:19 PM EDTMesoscale DiscussionSPC4 hr
Mar 25, 11:35 AM EDTSpecial Weather StatementCTP70 min
Mar 29, 2:28 AM EDTDense Fog AdvisoryCTP8 hr
Apr 1, 4:17 AM EDTWinter Weather AdvisoryCTP29 hr
Apr 2, 3:47 AM EDTMesoscale DiscussionSPC6 hr
Apr 3, 3:25 PM EDTWind AdvisoryCTP12 hr
Apr 4, 3:36 AM EDTHigh Wind WarningCTP16 hr
Apr 16, 1:44 AM EDTFlash Flood WatchCTP10 hr
Apr 16, 4:27 AM EDTSpecial Weather StatementCTP33 min
Apr 16, 6:48 AM EDTAreal Flood AdvisoryCTP4 hr
Apr 17, 1:07 PM EDTFreeze WarningCTP19 hr
Apr 19, 2:22 PM EDTFreeze WarningCTP18 hr
Apr 20, 4:27 AM EDTFreeze WatchCTP10 hr
Apr 20, 2:38 PM EDTFreeze WarningCTP17 hr
Apr 27, 11:38 PM EDTSpecial Weather StatementCTP52 min
Apr 28, 5:18 AM EDTDense Fog AdvisoryCTP4 hr
Apr 28, 9:03 AM EDTDense Fog AdvisoryCTP117 min
Apr 28, 3:11 PM EDTMesoscale DiscussionSPC2 hr
Apr 28, 4:03 PM EDTSpecial Weather StatementCTP27 min
May 2, 4:45 AM EDTRed Flag WarningCTP16 hr
May 10, 4:23 PM EDTMesoscale DiscussionSPC97 min
May 10, 5:11 PM EDTSevere Thunderstorm WarningCTP49 min
May 10, 5:45 PM EDTSevere Thunderstorm WarningCTP45 min
May 12, 3:59 PM EDTMesoscale DiscussionSPC3 hr
May 12, 4:58 PM EDTTornado WatchSPC5 hr
May 12, 6:01 PM EDTSpecial Weather StatementCTP44 min
May 12, 6:08 PM EDTSevere Thunderstorm WarningCTP52 min
May 12, 6:52 PM EDTSevere Thunderstorm WarningCTP53 min
May 12, 7:16 PM EDTMesoscale DiscussionSPC59 min
May 12, 7:48 PM EDTSpecial Weather StatementCTP42 min
May 13, 10:56 AM EDTSpecial Weather StatementCTP64 min
May 13, 8:38 PM EDTSpecial Weather StatementCTP37 min
May 14, 12:29 PM EDTSevere Thunderstorm WatchSPC9 hr
May 14, 3:26 PM EDTMesoscale DiscussionSPC2 hr
May 15, 3:47 AM EDTFlash Flood WatchCTP15 hr
May 15, 12:26 PM EDTSevere Thunderstorm WatchSPC7 hr
May 15, 3:33 PM EDTMesoscale DiscussionSPC117 min
May 15, 3:45 PM EDTSevere Thunderstorm WarningCTP60 min
May 15, 4:14 PM EDTTornado WarningCTP31 min
May 15, 4:31 PM EDTSevere Thunderstorm WarningCTP59 min
May 15, 4:41 PM EDTSevere Thunderstorm WarningCTP53 min
May 15, 5:07 PM EDTSevere Thunderstorm WarningCTP83 min
May 15, 6:02 PM EDTAreal Flood AdvisoryCTP118 min
May 16, 1:26 PM EDTFlood WatchCTP72 hr
May 27, 1:14 PM EDTFlash Flood WatchCTP7 hr
May 27, 2:52 PM EDTSpecial Weather StatementCTP23 min
May 27, 3:19 PM EDTSpecial Weather StatementCTP41 min
May 30, 4:37 AM EDTDense Fog AdvisoryCTP4 hr
Jun 1, 10:40 PM EDTFlash Flood WatchCTP7 hr
Jun 1, 11:53 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 2, 12:47 AM EDTFlash Flood WarningCTP3 hr
Jun 2, 5:40 AM EDTFlash Flood WatchCTP22 hr
Jun 2, 5:38 PM EDTAreal Flood AdvisoryCTP112 min
Jun 2, 6:07 PM EDTSpecial Weather StatementCTP38 min
Jun 2, 7:10 PM EDTAreal Flood AdvisoryCTP4 hr
Jun 2, 7:12 PM EDTSpecial Weather StatementCTP33 min
Jun 2, 7:39 PM EDTFlash Flood WarningCTP6 hr
Jun 2, 10:51 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 5, 3:05 PM EDTMesoscale DiscussionSPC2 hr
Jun 17, 2:14 PM EDTHeat AdvisoryCTP30 hr
Jun 24, 5:24 PM EDTSpecial Weather StatementCTP21 min
Jun 24, 6:00 PM EDTSpecial Weather StatementCTP60 min
Jun 24, 6:10 PM EDTSevere Thunderstorm WarningCTP49 min
Jun 24, 6:16 PM EDTMesoscale DiscussionSPC119 min
Jun 27, 7:37 PM EDTMesoscale DiscussionSPC3 hr
Jun 29, 2:28 PM EDTHeat AdvisoryCTP4 days
Jul 2, 2:48 PM EDTExcessive Heat WarningCTP29 hr
Jul 3, 9:05 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 4, 2:19 PM EDTHeat AdvisoryCTP4 hr
Jul 4, 4:40 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 4, 7:50 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 5, 4:17 AM EDTFlash Flood WatchCTP30 hr
Jul 5, 1:46 PM EDTAreal Flood AdvisoryCTP119 min
Jul 17, 1:19 PM EDTAreal Flood AdvisoryCTP116 min
Jul 21, 4:40 AM EDTFlash Flood WatchCTP23 hr
Jul 22, 2:01 AM EDTAreal Flood AdvisoryCTP4 hr
Jul 22, 5:57 AM EDTAreal Flood AdvisoryCTP5 hr
Jul 22, 11:43 AM EDTFlash Flood WatchCTP11 hr
Jul 22, 7:49 PM EDTAreal Flood AdvisoryCTP96 min
Jul 23, 12:13 AM EDTAreal Flood AdvisoryCTP6 hr
Jul 23, 3:59 AM EDTFlash Flood WatchCTP4 days
Jul 23, 8:06 AM EDTAreal Flood WarningCTP6 hr
Jul 23, 1:47 PM EDTAreal Flood WarningCTP9 hr
Jul 23, 2:40 PM EDTMesoscale DiscussionSPC3 hr
Jul 23, 8:57 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 23, 10:04 PM EDTFlash Flood WarningCTP5 hr
Jul 24, 2:56 AM EDTAreal Flood WarningCTP6 hr
Jul 24, 3:43 AM EDTAreal Flood AdvisoryCTP4 hr
Jul 24, 9:06 AM EDTAreal Flood WarningCTP9 hr
Jul 24, 10:54 AM EDTFlash Flood WarningCTP3 hr
Jul 24, 12:02 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 24, 5:58 PM EDTAreal Flood WarningCTP48 hr
Jul 24, 9:58 PM EDTSpecial Weather StatementCTP62 min
Jul 24, 10:19 PM EDTSevere Thunderstorm WarningCTP56 min
Jul 24, 10:20 PM EDTFlash Flood WarningCTP3 hr
Jul 24, 11:36 PM EDTRiver Flood WarningCTP59 hr
Jul 25, 12:52 AM EDTFlash Flood WarningCTP4 hr
Jul 25, 10:20 AM EDTRiver Flood WarningCTP72 hr
Jul 25, 10:20 AM EDTRiver Flood WarningCTP48 hr
Jul 25, 5:27 PM EDTFlash Flood WarningCTP4 hr
Jul 25, 6:04 PM EDTSpecial Weather StatementCTP56 min
Jul 25, 6:29 PM EDTFlash Flood WarningCTP6 hr
Jul 27, 9:36 AM EDTFlash Flood WatchCTP13 hr
Jul 27, 12:59 PM EDTMesoscale DiscussionSPC91 min
Jul 27, 1:17 PM EDTSevere Thunderstorm WatchSPC9 hr
Jul 27, 4:50 PM EDTMesoscale DiscussionSPC55 min
Jul 27, 6:23 PM EDTAreal Flood AdvisoryCTP112 min
Aug 1, 4:06 AM EDTFlash Flood WatchCTP3 days
Aug 1, 3:15 PM EDTMesoscale DiscussionSPC3 hr
Aug 2, 11:46 AM EDTMesoscale DiscussionSPC119 min
Aug 2, 4:44 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 3, 7:03 PM EDTAreal Flood AdvisoryCTP117 min
Aug 3, 8:08 PM EDTFlash Flood WarningCTP3 hr
Aug 3, 10:30 PM EDTAreal Flood AdvisoryCTP60 min
Aug 3, 10:57 PM EDTFlash Flood WarningCTP3 hr
Aug 3, 11:28 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 4, 1:36 AM EDTRiver Flood WarningCTP27 hr
Aug 4, 1:56 AM EDTFlash Flood WarningCTP5 hr
Aug 4, 6:44 AM EDTAreal Flood WarningCTP9 hr
Aug 5, 2:37 PM EDTHeat AdvisoryCTP28 hr
Aug 11, 10:54 AM EDTFlash Flood WatchCTP8 hr
Aug 13, 1:46 AM EDTFlash Flood WatchCTP43 hr
Aug 13, 2:24 AM EDTAreal Flood AdvisoryCTP4 hr
Aug 13, 6:38 AM EDTAreal Flood AdvisoryCTP3 hr
Aug 17, 5:06 PM EDTSpecial Weather StatementCTP24 min
Aug 17, 5:37 PM EDTSpecial Weather StatementCTP23 min
Aug 17, 5:49 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 18, 12:52 AM EDTAreal Flood AdvisoryCTP3 hr
Aug 21, 2:41 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 21, 4:56 PM EDTMesoscale DiscussionSPC2 hr
Aug 21, 7:06 PM EDTMesoscale DiscussionSPC84 min
Aug 21, 8:08 PM EDTSpecial Weather StatementCTP52 min
Aug 21, 8:29 PM EDTAreal Flood AdvisoryCTP61 min
Aug 21, 9:30 PM EDTAreal Flood AdvisoryCTP60 min
Aug 21, 10:26 PM EDTFlash Flood WarningCTP3 hr
Aug 22, 8:50 AM EDTRiver Flood WarningCTP10 hr
Aug 27, 4:25 AM EDTHeat AdvisoryCTP64 hr
Aug 31, 2:19 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 31, 2:55 PM EDTFlash Flood WarningCTP3 hr
Aug 31, 3:35 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 31, 4:38 PM EDTFlash Flood WarningCTP3 hr
Aug 31, 5:08 PM EDTFlash Flood WarningCTP3 hr
Aug 31, 7:35 PM EDTAreal Flood WarningCTP3 hr
Aug 31, 7:54 PM EDTAreal Flood WarningCTP3 hr
Aug 31, 10:59 PM EDTAreal Flood WarningCTP6 hr
Sep 1, 4:51 AM EDTRiver Flood WarningCTP5 hr
Sep 5, 3:31 AM EDTHeat AdvisoryCTP14 hr
Sep 6, 2:24 AM EDTHeat AdvisoryCTP16 hr
Sep 6, 4:37 PM EDTSpecial Weather StatementCTP53 min
Sep 6, 4:45 PM EDTAreal Flood AdvisoryCTP2 hr
Sep 7, 8:49 PM EDTAreal Flood AdvisoryCTP56 min
Sep 8, 3:12 AM EDTAreal Flood AdvisoryCTP3 hr
Sep 8, 3:33 AM EDTFlood WatchCTP64 hr
Sep 8, 6:00 AM EDTAreal Flood AdvisoryCTP3 hr
Sep 9, 3:52 AM EDTAreal Flood AdvisoryCTP3 hr
Sep 9, 9:27 AM EDTAreal Flood AdvisoryCTP63 min
Sep 9, 10:28 AM EDTAreal Flood WarningCTP24 hr
Sep 9, 11:21 AM EDTRiver Flood WarningCTP3 days
Sep 10, 2:41 AM EDTAreal Flood WarningCTP9 hr
Sep 16, 7:11 AM EDTDense Fog AdvisoryCTP3 hr
Sep 17, 4:51 AM EDTFlash Flood WatchCTP31 hr
Sep 17, 6:58 PM EDTSpecial Weather StatementCTP62 min
Sep 18, 12:48 AM EDTSpecial Weather StatementCTP57 min
Sep 18, 2:20 AM EDTFlash Flood WarningCTP3 hr
Sep 26, 3:40 PM EDTMesoscale DiscussionSPC3 hr
Sep 26, 5:02 PM EDTSevere Thunderstorm WatchSPC4 hr
Sep 27, 4:54 AM EDTFlood WatchCTP23 hr
Oct 2, 2:55 PM EDTTornado WatchSPC8 hr
Oct 11, 3:07 PM EDTSpecial Weather StatementCTP53 min
Oct 17, 2:28 PM EDTFreeze WatchCTP13 hr
Oct 18, 3:14 AM EDTFrost AdvisoryCTP30 hr
Oct 21, 4:20 AM EDTFrost AdvisoryCTP29 hr
Oct 24, 2:33 PM EDTFrost AdvisoryCTP18 hr
Nov 2, 8:35 PM EDTSpecial Weather StatementCTP40 min
Nov 2, 8:40 PM EDTAreal Flood AdvisoryCTP3 hr
Nov 2, 11:39 PM EDTAreal Flood AdvisoryCTP3 hr
Nov 14, 3:40 PM ESTWinter Storm WarningCTP38 hr
Nov 14, 3:40 PM ESTWinter Weather AdvisoryCTP38 hr
Nov 15, 9:56 AM ESTMesoscale DiscussionSPC6 hr
Nov 23, 11:02 AM ESTWinter Weather AdvisoryCTP27 hr
Nov 24, 6:08 PM ESTAreal Flood AdvisoryCTP3 hr
Nov 24, 11:12 PM ESTRiver Flood WarningCTP4 hr
Nov 25, 9:30 AM ESTRiver Flood WarningCTP3 hr
Nov 27, 3:14 PM ESTWind AdvisoryCTP25 hr
Dec 2, 7:37 PM ESTDense Fog AdvisoryCTP8 hr
Dec 14, 7:44 AM ESTDense Fog AdvisoryCTP3 hr
Dec 19, 3:49 AM ESTFlood WatchCTP69 hr
Dec 28, 8:36 PM ESTDense Fog 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 archive20172019

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.