Alert archive / Pennsylvania / Adams County

Weather alerts in Adams County, Pennsylvania, 2020

139 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts
139
Warnings
23
Watches
24
Advisories
35
Busiest month
August22 alerts
Busiest day
June 4, 20209 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 2020 had a tornado report inside them.

Adams County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings12120%1560%26 min
Flash flood warnings00

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings30100%0
NWS State College, PA: severe thunderstorm warnings16312821%42276%23 min
NWS State College, PA: flash flood warnings10640%2592%57 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 7, 2:01 AM ESTWinter Weather AdvisoryCTP17 hr
Jan 7, 12:29 PM ESTMesoscale DiscussionSPC2 hr
Jan 8, 6:40 AM ESTSpecial Weather StatementCTP65 min
Jan 8, 7:31 AM ESTSnow Squall WarningCTP44 min
Jan 8, 8:14 AM ESTSnow Squall WarningCTP46 min
Jan 8, 8:51 AM ESTSpecial Weather StatementCTP24 min
Jan 11, 4:07 AM ESTWind AdvisoryCTP30 hr
Jan 11, 11:51 PM ESTSpecial Weather StatementCTP54 min
Jan 12, 3:41 AM ESTSpecial Weather StatementCTP64 min
Jan 15, 2:23 PM ESTWind AdvisoryCTP29 hr
Jan 17, 3:01 PM ESTWinter Weather AdvisoryCTP30 hr
Jan 18, 11:53 AM ESTSpecial Weather StatementCTP82 min
Feb 1, 1:22 AM ESTDense Fog AdvisoryCTP7 hr
Feb 6, 10:49 PM ESTWind AdvisoryCTP18 hr
Feb 26, 3:40 AM ESTWind AdvisoryCTP40 hr
Mar 3, 4:27 PM ESTMesoscale DiscussionSPC2 hr
Mar 3, 10:52 PM ESTMesoscale DiscussionSPC113 min
Mar 3, 10:57 PM ESTSpecial Weather StatementCTP48 min
Apr 8, 8:43 PM EDTWind AdvisoryCTP21 hr
Apr 9, 11:28 AM EDTSpecial Weather StatementCTP47 min
Apr 10, 2:15 AM EDTFreeze WatchCTP11 hr
Apr 10, 2:15 AM EDTWind AdvisoryCTP17 hr
Apr 10, 1:21 PM EDTFreeze WarningCTP19 hr
Apr 12, 12:43 PM EDTWind AdvisoryCTP31 hr
Apr 13, 6:45 AM EDTSpecial Weather StatementCTP45 min
Apr 13, 10:34 AM EDTMesoscale DiscussionSPC86 min
Apr 13, 11:33 AM EDTTornado WatchSPC5 hr
Apr 13, 1:06 PM EDTSevere Thunderstorm WarningCTP53 min
Apr 13, 1:20 PM EDTMesoscale DiscussionSPC85 min
Apr 13, 1:37 PM EDTSevere Thunderstorm WarningCTP68 min
Apr 13, 2:09 PM EDTAreal Flood AdvisoryCTP3 hr
Apr 16, 4:56 AM EDTFreeze WatchCTP9 hr
Apr 16, 2:05 PM EDTFreeze WarningCTP19 hr
Apr 18, 3:34 AM EDTFrost AdvisoryCTP29 hr
Apr 21, 4:18 AM EDTFreeze WarningCTP29 hr
Apr 29, 3:33 AM EDTFlood WatchCTP50 hr
Apr 30, 10:59 AM EDTAreal Flood AdvisoryCTP6 hr
Apr 30, 2:12 PM EDTAreal Flood WarningCTP6 hr
Apr 30, 8:06 PM EDTAreal Flood AdvisoryCTP3 hr
May 7, 1:44 PM EDTFreeze WatchCTP13 hr
May 7, 1:44 PM EDTFreeze WarningCTP44 hr
May 9, 5:04 AM EDTFreeze WarningCTP27 hr
May 11, 2:58 AM EDTFrost AdvisoryCTP27 hr
May 12, 2:25 PM EDTFrost AdvisoryCTP18 hr
May 29, 12:27 PM EDTMesoscale DiscussionSPC63 min
May 29, 1:58 PM EDTSevere Thunderstorm WarningCTP47 min
May 29, 2:25 PM EDTSevere Thunderstorm WatchSPC7 hr
May 29, 2:35 PM EDTSevere Thunderstorm WarningCTP25 min
May 29, 3:11 PM EDTSpecial Weather StatementCTP34 min
May 29, 3:43 PM EDTSpecial Weather StatementCTP32 min
May 29, 8:01 PM EDTMesoscale DiscussionSPC119 min
Jun 3, 8:32 AM EDTMesoscale DiscussionSPC118 min
Jun 3, 10:08 AM EDTSevere Thunderstorm WatchSPC4 hr
Jun 3, 11:34 AM EDTMesoscale DiscussionSPC86 min
Jun 3, 3:10 PM EDTMesoscale DiscussionSPC2 hr
Jun 3, 3:52 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 4, 2:02 PM EDTMesoscale DiscussionSPC118 min
Jun 4, 2:29 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 4, 4:36 PM EDTSevere Thunderstorm WarningCTP54 min
Jun 4, 4:41 PM EDTMesoscale DiscussionSPC94 min
Jun 4, 5:27 PM EDTSpecial Weather StatementCTP33 min
Jun 4, 5:56 PM EDTSpecial Weather StatementCTP34 min
Jun 4, 6:31 PM EDTSevere Thunderstorm WarningCTP59 min
Jun 4, 6:41 PM EDTSpecial Weather StatementCTP34 min
Jun 4, 6:44 PM EDTMesoscale DiscussionSPC91 min
Jun 4, 8:54 PM EDTAreal Flood AdvisoryCTP111 min
Jun 5, 10:38 AM EDTFlash Flood WatchCTP10 hr
Jun 5, 5:39 PM EDTAreal Flood AdvisoryCTP111 min
Jun 22, 1:58 PM EDTMesoscale DiscussionSPC3 hr
Jun 25, 1:48 PM EDTMesoscale DiscussionSPC117 min
Jun 25, 3:41 PM EDTSpecial Weather StatementCTP34 min
Jul 6, 1:38 PM EDTSevere Thunderstorm WatchSPC9 hr
Jul 6, 4:33 PM EDTMesoscale DiscussionSPC117 min
Jul 6, 6:32 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 6, 8:02 PM EDTSpecial Weather StatementCTP28 min
Jul 6, 8:51 PM EDTSpecial Weather StatementCTP24 min
Jul 6, 8:56 PM EDTSevere Thunderstorm WarningCTP49 min
Jul 8, 7:39 PM EDTSpecial Weather StatementCTP36 min
Jul 18, 2:29 PM EDTHeat AdvisoryCTP54 hr
Jul 21, 2:01 PM EDTMesoscale DiscussionSPC59 min
Jul 21, 5:41 PM EDTSevere Thunderstorm WarningCTP34 min
Jul 21, 6:36 PM EDTAreal Flood AdvisoryCTP54 min
Jul 21, 7:28 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 22, 3:13 AM EDTHeat AdvisoryCTP17 hr
Jul 22, 10:48 AM EDTMesoscale DiscussionSPC117 min
Jul 22, 12:01 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 22, 1:38 PM EDTSevere Thunderstorm WarningCTP67 min
Jul 22, 2:56 PM EDTSpecial Weather StatementCTP34 min
Jul 22, 3:12 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 22, 3:28 PM EDTSpecial Weather StatementCTP32 min
Jul 24, 7:46 PM EDTSpecial Weather StatementCTP44 min
Jul 24, 9:50 PM EDTSpecial Weather StatementCTP25 min
Aug 1, 7:05 PM EDTMesoscale DiscussionSPC115 min
Aug 1, 11:14 PM EDTSpecial Weather StatementCTP31 min
Aug 2, 3:59 PM EDTFlash Flood WatchCTP47 hr
Aug 6, 1:59 PM EDTFlash Flood WatchCTP8 hr
Aug 6, 6:31 PM EDTAreal Flood AdvisoryCTP119 min
Aug 7, 10:06 AM EDTFlash Flood WatchCTP9 hr
Aug 7, 1:30 PM EDTMesoscale DiscussionSPC3 hr
Aug 7, 6:12 PM EDTSpecial Weather StatementCTP33 min
Aug 22, 5:04 PM EDTSpecial Weather StatementCTP41 min
Aug 23, 3:57 PM EDTMesoscale DiscussionSPC2 hr
Aug 24, 12:44 PM EDTMesoscale DiscussionSPC2 hr
Aug 25, 1:21 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 25, 3:10 PM EDTMesoscale DiscussionSPC95 min
Aug 27, 2:14 PM EDTMesoscale DiscussionSPC2 hr
Aug 27, 5:32 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 27, 6:35 PM EDTMesoscale DiscussionSPC115 min
Aug 28, 9:55 AM EDTMesoscale DiscussionSPC3 hr
Aug 28, 1:37 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 28, 2:16 PM EDTSevere Thunderstorm WarningCTP59 min
Aug 28, 2:22 PM EDTTornado WarningCTP38 min
Aug 28, 3:00 PM EDTSevere Thunderstorm WarningCTP60 min
Aug 29, 4:36 PM EDTSpecial Weather StatementCTP54 min
Sep 2, 3:37 PM EDTMesoscale DiscussionSPC53 min
Sep 2, 6:43 PM EDTSevere Thunderstorm WatchSPC5 hr
Sep 3, 3:06 PM EDTMesoscale DiscussionSPC114 min
Sep 3, 3:42 PM EDTTornado WatchSPC6 hr
Sep 3, 4:47 PM EDTSpecial Weather StatementCTP28 min
Sep 10, 1:38 PM EDTFlash Flood WatchCTP6 hr
Sep 10, 4:20 PM EDTAreal Flood AdvisoryCTP2 hr
Sep 19, 12:53 PM EDTFrost AdvisoryCTP20 hr
Sep 20, 11:59 AM EDTFrost AdvisoryCTP21 hr
Sep 21, 1:35 PM EDTFrost AdvisoryCTP19 hr
Oct 16, 2:44 PM EDTFrost AdvisoryCTP17 hr
Oct 17, 12:25 PM EDTFrost AdvisoryCTP21 hr
Oct 22, 3:58 AM EDTDense Fog AdvisoryCTP6 hr
Oct 29, 2:15 AM EDTFreeze WatchCTP12 hr
Oct 29, 2:04 PM EDTFreeze WarningCTP43 hr
Nov 1, 9:59 PM ESTWind AdvisoryCTP14 hr
Nov 14, 2:11 PM ESTWind AdvisoryCTP32 hr
Nov 15, 3:33 PM ESTMesoscale DiscussionSPC2 hr
Nov 15, 4:55 PM ESTSevere Thunderstorm WarningCTP80 min
Dec 13, 1:37 PM ESTWinter Weather AdvisoryCTP25 hr
Dec 14, 4:44 AM ESTWinter Storm WatchCTP34 hr
Dec 15, 4:30 AM ESTWinter Storm WarningCTP51 hr
Dec 16, 1:57 PM ESTMesoscale DiscussionSPC5 hr
Dec 16, 4:41 PM ESTSpecial Weather StatementCTP49 min
Dec 22, 3:09 PM ESTFlood WatchCTP69 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 archive20192021

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.