Alert archive / Pennsylvania / Adams County

Weather alerts in Adams County, Pennsylvania, 2017

134 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts
134
Warnings
15
Watches
21
Advisories
37
Busiest month
August30 alerts
Busiest day
August 5, 20177 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 Adams County in 2017 had a tornado report inside them.

Adams County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings11736%1080%36 min
Flash flood warnings110%0

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings16475%1040%19 min
NWS State College, PA: severe thunderstorm warnings19012136%34288%32 min
NWS State College, PA: flash flood warnings201525%4584%81 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, 3:06 PM ESTFreezing Rain AdvisoryCTP22 hr
Jan 4, 3:52 PM ESTWinter Weather AdvisoryCTP35 hr
Jan 9, 2:41 PM ESTWinter Weather AdvisoryCTP37 hr
Jan 13, 3:49 AM ESTWinter Weather AdvisoryCTP44 hr
Jan 17, 8:08 PM ESTDense Fog AdvisoryCTP8 hr
Jan 20, 3:43 AM ESTFreezing Rain AdvisoryCTP5 hr
Jan 20, 11:05 PM ESTDense Fog AdvisoryCTP14 hr
Jan 21, 4:52 PM ESTDense Fog AdvisoryCTP20 hr
Jan 22, 1:51 PM ESTWind AdvisoryCTP26 hr
Jan 26, 10:49 AM ESTWind AdvisoryCTP10 hr
Jan 30, 9:54 AM ESTSpecial Weather StatementCTP51 min
Jan 30, 11:44 AM ESTSpecial Weather StatementCTP76 min
Jan 31, 5:06 AM ESTSpecial Weather StatementCTP54 min
Jan 31, 5:53 AM ESTSpecial Weather StatementCTP52 min
Feb 7, 4:02 PM ESTWinter Storm WatchCTP12 hr
Feb 8, 4:13 AM ESTWinter Storm WarningCTP30 hr
Feb 12, 4:22 AM ESTWind AdvisoryCTP37 hr
Feb 25, 1:30 PM ESTSevere Thunderstorm WatchSPC6 hr
Feb 25, 2:13 PM ESTSpecial Weather StatementCTP32 min
Feb 25, 2:37 PM ESTSevere Thunderstorm WarningCTP68 min
Mar 1, 9:44 AM ESTMesoscale DiscussionSPC91 min
Mar 1, 10:38 AM ESTSevere Thunderstorm WatchSPC4 hr
Mar 1, 12:25 PM ESTMesoscale DiscussionSPC65 min
Mar 1, 12:58 PM ESTSpecial Weather StatementCTP47 min
Mar 1, 1:35 PM ESTSevere Thunderstorm WarningCTP70 min
Mar 1, 3:43 PM ESTWind AdvisoryCTP17 hr
Mar 3, 2:25 PM ESTSpecial Weather StatementCTP65 min
Mar 3, 2:54 PM ESTSpecial Weather StatementCTP66 min
Mar 10, 1:38 PM ESTSpecial Weather StatementCTP52 min
Mar 10, 3:02 PM ESTSpecial Weather StatementCTP28 min
Mar 11, 8:54 PM ESTWinter Storm WatchCTP18 hr
Mar 12, 3:24 PM EDTWinter Storm WarningCTP48 hr
Mar 13, 10:01 PM EDTMesoscale DiscussionSPC4 hr
Mar 14, 3:22 AM EDTMesoscale DiscussionSPC5 hr
Mar 14, 9:04 AM EDTMesoscale DiscussionSPC4 hr
Mar 14, 2:56 PM EDTWinter Weather AdvisoryCTP41 hr
Mar 17, 3:40 PM EDTWinter Weather AdvisoryCTP19 hr
Apr 6, 1:21 PM EDTSpecial Weather StatementCTP54 min
Apr 6, 1:24 PM EDTAreal Flood AdvisoryCTP3 hr
Apr 20, 6:33 PM EDTSpecial Weather StatementCTP27 min
Apr 20, 7:22 PM EDTSpecial Weather StatementCTP38 min
Apr 29, 2:20 AM EDTSpecial Weather StatementCTP70 min
Apr 29, 2:48 AM EDTSpecial Weather StatementCTP72 min
Apr 30, 3:25 PM EDTMesoscale DiscussionSPC95 min
May 1, 5:54 PM EDTSevere Thunderstorm WatchSPC5 hr
May 5, 9:36 AM EDTSpecial Weather StatementCTP39 min
May 5, 10:45 AM EDTAreal Flood AdvisoryCTP3 hr
May 8, 2:31 PM EDTFrost AdvisoryCTP16 hr
May 28, 6:49 AM EDTDense Fog AdvisoryCTP2 hr
May 30, 12:39 PM EDTSevere Thunderstorm WatchSPC6 hr
May 30, 4:03 PM EDTMesoscale DiscussionSPC117 min
Jun 19, 5:18 AM EDTFlash Flood WatchCTP11 hr
Jun 19, 10:45 AM EDTMesoscale DiscussionSPC3 hr
Jun 19, 11:13 AM EDTSevere Thunderstorm WatchSPC9 hr
Jun 19, 12:26 PM EDTSpecial Weather StatementCTP49 min
Jun 19, 12:40 PM EDTSevere Thunderstorm WarningCTP65 min
Jun 21, 2:38 PM EDTMesoscale DiscussionSPC3 hr
Jun 21, 4:42 PM EDTSpecial Weather StatementCTP33 min
Jun 23, 2:20 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 23, 4:53 PM EDTMesoscale DiscussionSPC2 hr
Jun 23, 6:43 PM EDTSpecial Weather StatementCTP47 min
Jun 23, 8:25 PM EDTMesoscale DiscussionSPC65 min
Jun 24, 1:11 AM EDTSpecial Weather StatementCTP64 min
Jul 1, 12:54 PM EDTMesoscale DiscussionSPC66 min
Jul 1, 1:34 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 1, 2:12 PM EDTSpecial Weather StatementCTP33 min
Jul 1, 4:10 PM EDTMesoscale DiscussionSPC2 hr
Jul 4, 3:27 PM EDTSpecial Weather StatementCTP33 min
Jul 6, 1:15 PM EDTFlash Flood WatchCTP13 hr
Jul 13, 2:57 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 14, 1:09 PM EDTMesoscale DiscussionSPC2 hr
Jul 14, 1:40 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 14, 4:23 PM EDTMesoscale DiscussionSPC67 min
Jul 17, 1:15 PM EDTSevere Thunderstorm WarningCTP45 min
Jul 17, 2:02 PM EDTSpecial Weather StatementCTP28 min
Jul 17, 2:47 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 17, 4:22 PM EDTSpecial Weather StatementCTP53 min
Jul 18, 1:18 PM EDTSpecial Weather StatementCTP42 min
Jul 18, 9:05 PM EDTSpecial Weather StatementCTP55 min
Jul 18, 10:43 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 20, 11:34 AM EDTHeat AdvisoryCTP8 hr
Jul 23, 2:27 PM EDTFlash Flood WatchCTP18 hr
Jul 23, 3:44 PM EDTMesoscale DiscussionSPC3 hr
Jul 23, 4:55 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 24, 2:17 PM EDTMesoscale DiscussionSPC118 min
Jul 27, 1:46 PM EDTFlash Flood WatchCTP41 hr
Jul 28, 12:15 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 28, 3:07 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 28, 8:25 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 28, 11:33 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 2, 12:01 PM EDTSpecial Weather StatementCTP29 min
Aug 2, 1:22 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 2, 1:30 PM EDTMesoscale DiscussionSPC2 hr
Aug 3, 3:01 PM EDTSpecial Weather StatementCTP29 min
Aug 3, 6:28 PM EDTMesoscale DiscussionSPC62 min
Aug 4, 1:03 PM EDTSpecial Weather StatementCTP42 min
Aug 4, 1:25 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 4, 7:41 PM EDTMesoscale DiscussionSPC2 hr
Aug 4, 8:55 PM EDTSevere Thunderstorm WarningCTP50 min
Aug 4, 9:30 PM EDTSevere Thunderstorm WarningCTP60 min
Aug 4, 9:53 PM EDTSevere Thunderstorm WarningCTP52 min
Aug 4, 10:12 PM EDTFlash Flood WarningCTP3 hr
Aug 4, 10:33 PM EDTSevere Thunderstorm WarningCTP87 min
Aug 4, 10:50 PM EDTSevere Thunderstorm WarningCTP85 min
Aug 4, 10:52 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 11, 3:48 PM EDTMesoscale DiscussionSPC87 min
Aug 12, 1:41 PM EDTMesoscale DiscussionSPC2 hr
Aug 12, 2:44 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 12, 5:17 PM EDTMesoscale DiscussionSPC88 min
Aug 15, 9:51 PM EDTDense Fog AdvisoryCTP11 hr
Aug 18, 1:54 PM EDTMesoscale DiscussionSPC2 hr
Aug 18, 2:27 PM EDTSevere Thunderstorm WatchSPC9 hr
Aug 19, 2:45 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 19, 7:58 PM EDTSpecial Weather StatementCTP62 min
Aug 19, 8:16 PM EDTMesoscale DiscussionSPC59 min
Aug 21, 2:53 PM EDTMesoscale DiscussionSPC2 hr
Aug 22, 3:08 PM EDTMesoscale DiscussionSPC67 min
Aug 22, 4:19 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 22, 7:07 PM EDTMesoscale DiscussionSPC113 min
Aug 22, 8:20 PM EDTSpecial Weather StatementCTP55 min
Sep 5, 2:31 PM EDTMesoscale DiscussionSPC59 min
Sep 5, 3:02 PM EDTSevere Thunderstorm WarningCTP58 min
Sep 5, 3:26 PM EDTSevere Thunderstorm WatchSPC5 hr
Sep 5, 3:51 PM EDTSevere Thunderstorm WarningCTP84 min
Sep 5, 4:07 PM EDTTornado WarningCTP38 min
Sep 16, 6:50 AM EDTDense Fog AdvisoryCTP3 hr
Oct 16, 12:24 PM EDTFrost AdvisoryCTP21 hr
Oct 23, 6:03 PM EDTWind AdvisoryCTP14 hr
Oct 26, 4:09 AM EDTFrost AdvisoryCTP28 hr
Oct 29, 4:16 AM EDTWind AdvisoryCTP32 hr
Nov 9, 8:05 AM ESTSpecial Weather StatementCTP55 min
Nov 18, 4:05 AM ESTWind AdvisoryCTP32 hr
Dec 24, 11:12 AM ESTWind AdvisoryCTP29 hr
Dec 29, 2:59 PM ESTWinter Weather AdvisoryCTP30 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 archive20162018

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.