Alert archive / Pennsylvania / Columbia County

Weather alerts in Columbia County, Pennsylvania, 2020

101 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Columbia County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts
101
Warnings
19
Watches
16
Advisories
20
Busiest month
August16 alerts
Busiest day
June 3, 20206 alerts

Over time

By month

Warning verification

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

Columbia County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings8625%838%8 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 8, 5:52 AM ESTSnow Squall WarningCTP53 min
Jan 8, 6:44 AM ESTSnow Squall WarningCTP46 min
Jan 11, 4:07 AM ESTWind AdvisoryCTP30 hr
Jan 15, 2:23 PM ESTWind AdvisoryCTP29 hr
Jan 17, 3:01 PM ESTWinter Weather AdvisoryCTP30 hr
Feb 5, 3:41 AM ESTWinter Weather AdvisoryCTP30 hr
Feb 6, 1:27 PM ESTWinter Weather AdvisoryCTP25 hr
Feb 12, 4:11 AM ESTWinter Weather AdvisoryCTP30 hr
Feb 26, 3:40 AM ESTWind AdvisoryCTP40 hr
Feb 27, 11:26 PM ESTSpecial Weather StatementCTP2 hr
Mar 3, 6:50 PM ESTMesoscale DiscussionSPC2 hr
Mar 3, 10:52 PM ESTMesoscale DiscussionSPC113 min
Mar 20, 4:08 PM EDTSpecial Weather StatementCTP67 min
Mar 23, 2:50 PM EDTSpecial Weather StatementCTP85 min
Mar 30, 12:39 AM EDTDense Fog AdvisoryCTP7 hr
Apr 8, 12:45 AM EDTSpecial Weather StatementCTP30 min
Apr 8, 1:16 AM EDTSpecial Weather StatementCTP14 min
Apr 9, 10:34 AM EDTSpecial Weather StatementCTP41 min
Apr 9, 11:44 AM EDTSpecial Weather StatementCTP46 min
Apr 9, 12:25 PM EDTSpecial Weather StatementCTP35 min
Apr 12, 12:43 PM EDTWind AdvisoryCTP31 hr
Apr 13, 11:33 AM EDTTornado WatchSPC5 hr
Apr 13, 1:20 PM EDTMesoscale DiscussionSPC85 min
Apr 16, 2:55 PM EDTSpecial Weather StatementCTP110 min
Apr 21, 3:03 PM EDTSpecial Weather StatementCTP42 min
Apr 29, 3:33 AM EDTFlood WatchCTP50 hr
Apr 30, 1:22 PM EDTSpecial Weather StatementCTP113 min
Apr 30, 1:34 PM EDTAreal Flood AdvisoryCTP6 hr
Apr 30, 4:39 PM EDTAreal Flood WarningCTP6 hr
May 7, 1:44 PM EDTFreeze WarningCTP44 hr
May 9, 5:04 AM EDTFreeze WarningCTP27 hr
May 10, 1:35 PM EDTFreeze WatchCTP13 hr
May 11, 2:58 AM EDTFreeze WarningCTP30 hr
May 11, 3:09 PM EDTFreeze WatchCTP19 hr
May 12, 10:20 AM EDTFreeze WarningCTP22 hr
May 13, 2:02 PM EDTFrost AdvisoryCTP18 hr
May 20, 1:14 PM EDTFrost AdvisoryCTP18 hr
May 29, 12:27 PM EDTMesoscale DiscussionSPC63 min
May 29, 1:30 PM EDTSpecial Weather StatementCTP30 min
May 29, 1:39 PM EDTSevere Thunderstorm WarningCTP37 min
May 29, 2:25 PM EDTSevere Thunderstorm WatchSPC7 hr
May 29, 7:33 PM EDTSpecial Weather StatementCTP42 min
May 29, 8:01 PM EDTMesoscale DiscussionSPC119 min
May 29, 9:11 PM EDTSpecial Weather StatementCTP34 min
Jun 3, 8:32 AM EDTMesoscale DiscussionSPC118 min
Jun 3, 10:08 AM EDTSevere Thunderstorm WatchSPC4 hr
Jun 3, 10:17 AM EDTSpecial Weather StatementCTP43 min
Jun 3, 10:50 AM EDTSevere Thunderstorm WarningCTP40 min
Jun 3, 3:10 PM EDTMesoscale DiscussionSPC2 hr
Jun 3, 3:52 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 4, 2:29 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 4, 4:41 PM EDTMesoscale DiscussionSPC94 min
Jun 4, 6:44 PM EDTMesoscale DiscussionSPC91 min
Jun 4, 8:13 PM EDTSpecial Weather StatementCTP47 min
Jun 4, 8:40 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 10, 1:39 PM EDTMesoscale DiscussionSPC2 hr
Jun 27, 12:34 PM EDTMesoscale DiscussionSPC2 hr
Jun 28, 1:47 PM EDTSpecial Weather StatementCTP28 min
Jul 3, 4:45 PM EDTSpecial Weather StatementCTP45 min
Jul 3, 5:09 PM EDTSevere Thunderstorm WarningCTP18 min
Jul 8, 12:19 PM EDTFlash Flood WatchCTP9 hr
Jul 8, 4:58 PM EDTSpecial Weather StatementCTP47 min
Jul 8, 6:15 PM EDTSevere Thunderstorm WarningCTP60 min
Jul 11, 2:06 PM EDTMesoscale DiscussionSPC84 min
Jul 12, 7:06 PM EDTSevere Thunderstorm WarningCTP50 min
Jul 19, 5:52 PM EDTMesoscale DiscussionSPC83 min
Jul 22, 12:01 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 23, 12:05 PM EDTMesoscale DiscussionSPC115 min
Jul 23, 6:48 PM EDTMesoscale DiscussionSPC57 min
Jul 30, 1:20 PM EDTMesoscale DiscussionSPC115 min
Aug 2, 2:00 PM EDTMesoscale DiscussionSPC2 hr
Aug 7, 9:51 AM EDTSpecial Weather StatementCTP39 min
Aug 7, 10:06 AM EDTFlash Flood WatchCTP9 hr
Aug 7, 10:10 AM EDTSevere Thunderstorm WarningCTP65 min
Aug 7, 1:51 PM EDTAreal Flood AdvisoryCTP114 min
Aug 24, 12:44 PM EDTMesoscale DiscussionSPC2 hr
Aug 24, 3:18 PM EDTSpecial Weather StatementCTP27 min
Aug 24, 3:29 PM EDTSpecial Weather StatementCTP31 min
Aug 25, 1:21 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 27, 5:32 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 27, 7:29 PM EDTSevere Thunderstorm WarningCTP47 min
Aug 28, 1:37 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 28, 1:48 PM EDTSevere Thunderstorm WarningCTP42 min
Aug 29, 3:56 PM EDTMesoscale DiscussionSPC2 hr
Aug 29, 5:01 PM EDTSpecial Weather StatementCTP44 min
Aug 29, 5:33 PM EDTSpecial Weather StatementCTP57 min
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
Nov 1, 9:59 PM ESTWind AdvisoryCTP14 hr
Nov 14, 2:11 PM ESTWind AdvisoryCTP32 hr
Nov 15, 3:33 PM ESTMesoscale DiscussionSPC2 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, 6:48 PM ESTMesoscale DiscussionSPC5 hr
Dec 22, 3:09 PM ESTFlood WatchCTP69 hr
Dec 23, 1:28 PM ESTRiver Flood WarningCTP4 days
Dec 23, 1:28 PM ESTRiver Flood WarningCTP4 days
Dec 25, 3:58 AM ESTAreal Flood WarningCTP3 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.