Alert archive / Pennsylvania / Franklin County

Weather alerts in Franklin County, Pennsylvania, 2021

135 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Franklin County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts
135
Warnings
30
Watches
27
Advisories
27
Busiest month
July37 alerts
Busiest day
July 17, 20218 alerts

Over time

By month

Warning verification

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

Franklin County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings171229%1377%21 min
Flash flood warnings2150%0

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings11373%1225%7 min
NWS State College, PA: severe thunderstorm warnings28921227%45887%23 min
NWS State College, PA: flash flood warnings312035%4689%118 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 2, 3:16 PM ESTWinter Weather AdvisoryCTP32 hr
Jan 20, 6:27 AM ESTSpecial Weather StatementCTP48 min
Jan 25, 3:29 AM ESTWinter Weather AdvisoryCTP43 hr
Jan 29, 8:54 PM ESTWinter Storm WatchCTP19 hr
Jan 30, 3:24 PM ESTWinter Storm WarningCTP13 hr
Jan 31, 4:52 AM ESTWinter Storm WarningCTP48 hr
Feb 6, 3:14 AM ESTWinter Weather AdvisoryCTP33 hr
Feb 10, 4:33 AM ESTWinter Weather AdvisoryCTP28 hr
Feb 13, 2:53 PM ESTWinter Weather AdvisoryCTP17 hr
Feb 14, 3:46 PM ESTWinter Storm WatchCTP13 hr
Feb 14, 3:46 PM ESTWinter Weather AdvisoryCTP38 hr
Feb 15, 2:44 PM ESTMesoscale DiscussionSPC6 hr
Feb 16, 3:35 PM ESTWinter Storm WatchCTP23 hr
Feb 17, 2:39 PM ESTWinter Storm WarningCTP22 hr
Feb 18, 12:25 PM ESTWinter Weather AdvisoryCTP22 hr
Feb 21, 2:29 PM ESTWinter Weather AdvisoryCTP23 hr
Feb 22, 7:48 AM ESTMesoscale DiscussionSPC4 hr
Mar 1, 2:33 AM ESTDense Fog AdvisoryCTP5 hr
Mar 1, 3:40 AM ESTWind AdvisoryCTP23 hr
Mar 13, 2:42 PM ESTFire Weather WatchCTP13 hr
Mar 14, 4:19 AM EDTRed Flag WarningCTP18 hr
Mar 25, 1:44 AM EDTDense Fog AdvisoryCTP7 hr
Mar 25, 11:51 AM EDTWind AdvisoryCTP30 hr
Mar 28, 3:52 PM EDTSpecial Weather StatementCTP38 min
Apr 11, 4:54 PM EDTMesoscale DiscussionSPC2 hr
Apr 11, 8:28 PM EDTSpecial Weather StatementCTP17 min
Apr 11, 8:47 PM EDTSpecial Weather StatementCTP13 min
Apr 21, 2:11 AM EDTFreeze WatchCTP5 hr
Apr 21, 7:07 AM EDTFreeze WarningCTP26 hr
Apr 22, 9:16 AM EDTFreeze WatchCTP4 hr
Apr 22, 1:06 PM EDTFreeze WarningCTP20 hr
Apr 29, 3:58 AM EDTHigh Wind WatchCTP16 hr
Apr 29, 8:21 PM EDTHigh Wind WarningCTP27 hr
Apr 29, 8:21 PM EDTWind AdvisoryCTP30 hr
May 26, 12:59 PM EDTSevere Thunderstorm WatchSPC7 hr
May 26, 2:07 PM EDTSpecial Weather StatementCTP23 min
May 26, 2:42 PM EDTSevere Thunderstorm WarningCTP50 min
Jun 3, 2:48 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 10, 11:47 AM EDTFlash Flood WatchCTP9 hr
Jun 10, 3:56 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 14, 2:06 PM EDTSevere Thunderstorm WatchSPC9 hr
Jun 21, 1:51 PM EDTMesoscale DiscussionSPC114 min
Jun 21, 2:20 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 21, 4:18 PM EDTSpecial Weather StatementCTP27 min
Jun 21, 4:31 PM EDTSevere Thunderstorm WarningCTP59 min
Jun 30, 4:41 PM EDTMesoscale DiscussionSPC2 hr
Jun 30, 4:51 PM EDTSevere Thunderstorm WatchSPC3 hr
Jun 30, 5:24 PM EDTSevere Thunderstorm WarningCTP48 min
Jul 1, 11:16 AM EDTSpecial Weather StatementCTP14 min
Jul 5, 2:13 PM EDTHeat AdvisoryCTP28 hr
Jul 6, 6:59 PM EDTHeat AdvisoryCTP24 hr
Jul 7, 5:50 PM EDTSevere Thunderstorm WarningCTP40 min
Jul 7, 6:37 PM EDTSevere Thunderstorm WarningCTP37 min
Jul 7, 8:49 PM EDTSpecial Weather StatementCTP26 min
Jul 8, 3:17 PM EDTSevere Thunderstorm WarningCTP73 min
Jul 8, 4:36 PM EDTSpecial Weather StatementCTP54 min
Jul 11, 2:05 PM EDTMesoscale DiscussionSPC55 min
Jul 11, 2:40 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 11, 6:57 PM EDTSevere Thunderstorm WarningCTP63 min
Jul 11, 7:58 PM EDTSevere Thunderstorm WarningCTP62 min
Jul 11, 8:58 PM EDTMesoscale DiscussionSPC62 min
Jul 11, 9:08 PM EDTSpecial Weather StatementCTP37 min
Jul 12, 1:32 PM EDTMesoscale DiscussionSPC88 min
Jul 12, 2:45 PM EDTSpecial Weather StatementCTP60 min
Jul 13, 1:37 PM EDTSevere Thunderstorm WatchSPC10 hr
Jul 13, 4:07 PM EDTMesoscale DiscussionSPC113 min
Jul 13, 8:08 PM EDTSpecial Weather StatementCTP37 min
Jul 17, 12:00 PM EDTMesoscale DiscussionSPC3 hr
Jul 17, 1:13 PM EDTSevere Thunderstorm WatchSPC10 hr
Jul 17, 4:38 PM EDTMesoscale DiscussionSPC97 min
Jul 17, 4:44 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 17, 5:08 PM EDTSpecial Weather StatementCTP37 min
Jul 17, 5:30 PM EDTSpecial Weather StatementCTP30 min
Jul 17, 5:42 PM EDTFlash Flood Warning Considerable damage threatCTP111 min
Jul 17, 6:09 PM EDTSevere Thunderstorm WarningCTP36 min
Jul 21, 11:00 AM EDTSpecial Weather StatementCTP45 min
Jul 21, 11:40 AM EDTSpecial Weather StatementCTP35 min
Jul 21, 11:56 AM EDTSevere Thunderstorm WatchSPC7 hr
Jul 21, 12:06 PM EDTSpecial Weather StatementCTP24 min
Jul 21, 1:16 PM EDTSpecial Weather StatementCTP29 min
Jul 21, 1:22 PM EDTSevere Thunderstorm WarningCTP38 min
Jul 28, 5:35 PM EDTSpecial Weather StatementCTP55 min
Jul 28, 6:22 PM EDTSpecial Weather StatementCTP38 min
Jul 29, 1:21 PM EDTMesoscale DiscussionSPC114 min
Jul 29, 2:23 PM EDTTornado WatchSPC8 hr
Aug 10, 12:55 PM EDTHeat AdvisoryCTP30 hr
Aug 10, 12:55 PM EDTHeat AdvisoryCTP54 hr
Aug 11, 3:38 AM EDTExcessive Heat WarningCTP39 hr
Aug 11, 2:03 PM EDTMesoscale DiscussionSPC87 min
Aug 11, 3:02 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 11, 4:08 PM EDTSpecial Weather StatementCTP37 min
Aug 12, 3:33 AM EDTHeat AdvisoryCTP39 hr
Aug 12, 1:11 PM EDTSevere Thunderstorm WatchSPC9 hr
Aug 13, 12:33 PM EDTMesoscale DiscussionSPC87 min
Aug 13, 1:11 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 13, 1:49 PM EDTSpecial Weather StatementCTP41 min
Aug 13, 2:12 PM EDTSevere Thunderstorm WarningCTP63 min
Aug 13, 3:12 PM EDTSevere Thunderstorm WarningCTP63 min
Aug 17, 2:13 PM EDTFlash Flood WatchCTP34 hr
Aug 17, 6:55 PM EDTSpecial Weather StatementCTP35 min
Aug 18, 10:58 AM EDTMesoscale DiscussionSPC92 min
Aug 18, 11:37 AM EDTTornado WatchSPC11 hr
Aug 18, 3:29 PM EDTMesoscale DiscussionSPC91 min
Aug 18, 4:05 PM EDTSevere Thunderstorm WarningCTP40 min
Aug 18, 4:39 PM EDTSevere Thunderstorm WarningCTP36 min
Aug 18, 4:57 PM EDTMesoscale DiscussionSPC93 min
Aug 18, 5:10 PM EDTSevere Thunderstorm WarningCTP35 min
Aug 18, 6:37 PM EDTAreal Flood AdvisoryCTP2 hr
Aug 23, 8:09 PM EDTSpecial Weather StatementCTP36 min
Aug 27, 1:41 PM EDTMesoscale DiscussionSPC3 hr
Aug 28, 1:05 PM EDTMesoscale DiscussionSPC115 min
Aug 28, 4:19 PM EDTSpecial Weather StatementCTP26 min
Aug 28, 4:49 PM EDTSpecial Weather StatementCTP26 min
Aug 30, 4:11 AM EDTFlash Flood WatchCTP67 hr
Sep 1, 9:45 AM EDTAreal Flood AdvisoryCTP2 hr
Sep 1, 12:04 PM EDTFlash Flood Warning Considerable damage threatCTP6 hr
Sep 1, 4:40 PM EDTAreal Flood WarningCTP6 hr
Sep 1, 5:41 PM EDTAreal Flood WarningCTP14 hr
Sep 8, 8:13 PM EDTSpecial Weather StatementCTP17 min
Sep 9, 5:00 PM EDTSpecial Weather StatementCTP30 min
Sep 15, 10:33 AM EDTMesoscale DiscussionSPC2 hr
Sep 15, 11:55 AM EDTSevere Thunderstorm WatchSPC8 hr
Sep 15, 4:43 PM EDTSevere Thunderstorm WarningCTP32 min
Sep 15, 5:19 PM EDTSpecial Weather StatementCTP26 min
Sep 15, 6:24 PM EDTSevere Thunderstorm WarningCTP27 min
Sep 22, 3:42 AM EDTFlash Flood WatchCTP33 hr
Sep 23, 2:15 AM EDTAreal Flood AdvisoryCTP2 hr
Sep 28, 6:14 AM EDTSpecial Weather StatementCTP46 min
Oct 14, 3:10 AM EDTDense Fog AdvisoryCTP6 hr
Nov 1, 4:23 AM EDTFreeze WatchCTP22 hr
Nov 2, 2:47 AM EDTFreeze WarningCTP30 hr
Nov 12, 3:17 AM ESTSpecial Weather StatementCTP43 min
Dec 2, 12:08 PM ESTWind AdvisoryCTP16 hr
Dec 10, 11:15 AM ESTWind AdvisoryCTP38 hr
Dec 30, 10:09 PM ESTDense Fog AdvisoryCTP12 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 archive20202022

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.