Alert archive / Pennsylvania / Adams County

Weather alerts in Adams County, Pennsylvania, 2018

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

Adams County and its neighbors

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

Alerts
161
Warnings
25
Watches
31
Advisories
60
Busiest month
July28 alerts
Busiest day
May 15, 20185 alerts

Over time

By month

Warning verification

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

Adams County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings8625%888%18 min
Flash flood warnings4250%10%

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 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 12, 6:28 PM ESTSevere Thunderstorm WarningCTP62 min
Jan 15, 2:22 PM ESTWinter Weather AdvisoryCTP41 hr
Jan 23, 6:34 AM ESTAreal Flood AdvisoryCTP3 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 7, 5:28 AM ESTMesoscale DiscussionSPC5 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, 1:51 PM ESTMesoscale DiscussionSPC4 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 6, 4:21 PM ESTWinter Weather AdvisoryCTP22 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 25, 12:11 PM EDTSpecial Weather StatementCTP64 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, 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, 4:03 PM EDTSpecial Weather StatementCTP27 min
May 2, 4:45 AM EDTRed Flag WarningCTP16 hr
May 10, 3:52 PM EDTSpecial Weather StatementCTP68 min
May 10, 4:12 PM EDTSevere Thunderstorm WarningCTP63 min
May 10, 5:11 PM EDTSevere Thunderstorm WarningCTP49 min
May 12, 2:47 PM EDTSevere Thunderstorm WatchSPC8 hr
May 12, 5:05 PM EDTMesoscale DiscussionSPC115 min
May 12, 6:27 PM EDTSpecial Weather StatementCTP48 min
May 12, 6:52 PM EDTSevere Thunderstorm WarningCTP53 min
May 14, 11:56 AM EDTMesoscale DiscussionSPC64 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, 4:31 PM EDTSevere Thunderstorm WarningCTP59 min
May 15, 5:07 PM EDTSevere Thunderstorm WarningCTP83 min
May 16, 1:26 PM EDTFlood WatchCTP72 hr
May 27, 1:14 PM EDTFlash Flood WatchCTP7 hr
May 27, 2:43 PM EDTSpecial Weather StatementCTP32 min
May 30, 4:37 AM EDTDense Fog AdvisoryCTP4 hr
Jun 1, 9:39 PM EDTAreal Flood AdvisoryCTP111 min
Jun 1, 10:40 PM EDTFlash Flood WatchCTP7 hr
Jun 2, 5:40 AM EDTFlash Flood WatchCTP22 hr
Jun 5, 3:05 PM EDTMesoscale DiscussionSPC2 hr
Jun 5, 6:52 PM EDTSpecial Weather StatementCTP23 min
Jun 17, 2:14 PM EDTHeat AdvisoryCTP30 hr
Jun 19, 3:34 AM EDTSpecial Weather StatementCTP26 min
Jun 24, 4:59 PM EDTSpecial Weather StatementCTP46 min
Jun 24, 5:21 PM EDTSevere Thunderstorm WarningCTP54 min
Jun 27, 7:37 PM EDTMesoscale DiscussionSPC3 hr
Jun 29, 2:28 PM EDTHeat AdvisoryCTP4 days
Jul 2, 1:03 PM EDTMesoscale DiscussionSPC72 min
Jul 2, 2:48 PM EDTExcessive Heat WarningCTP29 hr
Jul 4, 2:19 PM EDTHeat AdvisoryCTP4 hr
Jul 4, 4:05 PM EDTSpecial Weather StatementCTP25 min
Jul 4, 4:16 PM EDTAreal Flood AdvisoryCTP3 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 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, 11:00 AM EDTAreal Flood AdvisoryCTP3 hr
Jul 22, 11:43 AM EDTFlash Flood WatchCTP11 hr
Jul 23, 12:13 AM EDTAreal Flood AdvisoryCTP6 hr
Jul 23, 3:59 AM EDTFlash Flood WatchCTP4 days
Jul 23, 4:58 AM EDTAreal Flood AdvisoryCTP2 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, 9:06 AM EDTAreal Flood WarningCTP9 hr
Jul 24, 5:58 PM EDTAreal Flood WarningCTP48 hr
Jul 25, 3:48 PM EDTFlash Flood WarningCTP3 hr
Jul 25, 5:27 PM EDTFlash Flood WarningCTP4 hr
Jul 27, 9:36 AM EDTFlash Flood WatchCTP13 hr
Jul 27, 1:17 PM EDTSevere Thunderstorm WatchSPC9 hr
Jul 27, 4:50 PM EDTMesoscale DiscussionSPC55 min
Aug 1, 4:06 AM EDTFlash Flood WatchCTP3 days
Aug 1, 3:15 PM EDTMesoscale DiscussionSPC3 hr
Aug 3, 10:30 PM EDTAreal Flood AdvisoryCTP60 min
Aug 3, 11:28 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 5, 2:37 PM EDTHeat AdvisoryCTP28 hr
Aug 6, 4:49 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 8, 7:51 PM EDTSpecial Weather StatementCTP39 min
Aug 8, 8:01 PM EDTSevere Thunderstorm WarningCTP36 min
Aug 8, 8:39 PM EDTAreal Flood AdvisoryCTP2 hr
Aug 8, 9:27 PM EDTSpecial Weather StatementCTP33 min
Aug 11, 10:54 AM EDTFlash Flood WatchCTP8 hr
Aug 13, 1:46 AM EDTFlash Flood WatchCTP43 hr
Aug 21, 2:41 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 21, 4:56 PM EDTMesoscale DiscussionSPC2 hr
Aug 21, 6:41 PM EDTSpecial Weather StatementCTP34 min
Aug 21, 7:06 PM EDTMesoscale DiscussionSPC84 min
Aug 21, 7:24 PM EDTSpecial Weather StatementCTP36 min
Aug 21, 8:08 PM EDTSpecial Weather StatementCTP52 min
Aug 21, 8:29 PM EDTAreal Flood AdvisoryCTP61 min
Aug 27, 4:25 AM EDTHeat AdvisoryCTP64 hr
Aug 31, 4:09 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 31, 4:44 PM EDTFlash Flood WarningCTP3 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 7, 3:51 PM EDTSpecial Weather StatementCTP39 min
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 16, 7:11 AM EDTDense Fog AdvisoryCTP3 hr
Sep 17, 4:51 AM EDTFlash Flood WatchCTP31 hr
Sep 17, 9:38 PM EDTSpecial Weather StatementCTP67 min
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
Sep 28, 12:19 AM EDTAreal Flood AdvisoryCTP3 hr
Oct 2, 2:55 PM EDTTornado WatchSPC8 hr
Oct 8, 3:30 AM EDTDense Fog AdvisoryCTP7 hr
Oct 17, 2:28 PM EDTFreeze WatchCTP13 hr
Oct 18, 3:14 AM EDTFrost AdvisoryCTP30 hr
Nov 2, 6:19 AM EDTSpecial Weather StatementCTP26 min
Nov 2, 6:51 AM EDTSpecial Weather StatementCTP24 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, 3:18 AM ESTMesoscale DiscussionSPC6 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 27, 3:14 PM ESTWind AdvisoryCTP25 hr
Dec 2, 7:37 PM ESTDense Fog AdvisoryCTP8 hr
Dec 19, 3:49 AM ESTFlood WatchCTP69 hr
Dec 21, 3:24 PM ESTSpecial Weather StatementCTP36 min
Dec 21, 4:16 PM ESTMesoscale DiscussionSPC59 min
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.