Alert archive / Pennsylvania / Franklin County

Weather alerts in Franklin County, Pennsylvania, 2009

142 weather alerts in 2009, 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 2009. Tap one for its archive.

Alerts
142
Warnings
22
Watches
19
Advisories
42
Busiest month
June32 alerts
Busiest day
June 9, 20099 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, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings15847%1060%39 min
Flash flood warnings220%3100%36 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings13377%580%22 min
NWS State College, PA: severe thunderstorm warnings1668648%18280%26 min
NWS State College, PA: flash flood warnings382339%4393%64 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 5, 3:10 AM ESTWinter Storm WatchCTP19 hr
Jan 5, 10:11 PM ESTIce Storm WarningCTP39 hr
Jan 6, 5:17 PM ESTMesoscale DiscussionSPC4 hr
Jan 8, 3:30 PM ESTWinter Storm WatchCTP23 hr
Jan 9, 2:32 PM ESTWinter Weather AdvisoryCTP37 hr
Jan 26, 3:30 AM ESTWinter Storm WatchCTP32 hr
Jan 27, 11:40 AM ESTWinter Storm WarningCTP31 hr
Jan 28, 12:31 AM ESTMesoscale DiscussionSPC5 hr
Feb 10, 3:31 PM ESTHigh Wind WatchCTP24 hr
Feb 11, 3:09 PM ESTHigh Wind WarningCTP28 hr
Feb 11, 3:09 PM ESTWind AdvisoryCTP32 hr
Feb 11, 5:32 PM ESTMesoscale DiscussionSPC88 min
Feb 11, 8:00 PM ESTMesoscale DiscussionSPC60 min
Feb 11, 8:19 PM ESTSevere Thunderstorm WatchSPC3 hr
Feb 11, 8:41 PM ESTSevere Thunderstorm WarningCTP64 min
Feb 17, 2:45 PM ESTWinter Weather AdvisoryCTP34 hr
Mar 8, 3:29 PM EDTWind AdvisoryCTP24 hr
Mar 10, 3:48 PM EDTWind AdvisoryCTP28 hr
Mar 27, 3:55 AM EDTDense Fog AdvisoryCTP6 hr
Mar 29, 1:49 PM EDTMesoscale DiscussionSPC116 min
Apr 3, 3:04 AM EDTHigh Wind WatchCTP9 hr
Apr 3, 9:31 AM EDTSpecial Weather StatementCTP74 min
Apr 3, 11:47 AM EDTWind AdvisoryCTP28 hr
Apr 16, 3:06 PM EDTFrost AdvisoryCTP18 hr
Apr 21, 2:12 PM EDTMesoscale DiscussionSPC2 hr
Apr 23, 2:57 AM EDTFrost AdvisoryCTP29 hr
Apr 28, 10:43 AM EDTRed Flag WarningCTP9 hr
May 4, 1:57 PM EDTAreal Flood AdvisoryCTP4 hr
May 5, 3:11 PM EDTFlood WatchCTP36 hr
May 14, 5:18 PM EDTSpecial Weather StatementCTP27 min
May 15, 2:39 AM EDTDense Fog AdvisoryCTP5 hr
May 16, 12:05 PM EDTMesoscale DiscussionSPC55 min
May 16, 1:00 PM EDTSevere Thunderstorm WatchSPC7 hr
May 16, 3:55 PM EDTMesoscale DiscussionSPC65 min
May 16, 6:29 PM EDTMesoscale DiscussionSPC2 hr
May 16, 6:31 PM EDTSpecial Weather StatementCTP29 min
May 16, 6:57 PM EDTSpecial Weather StatementCTP33 min
May 17, 3:20 AM EDTFrost AdvisoryCTP30 hr
May 18, 3:28 PM EDTFrost AdvisoryCTP17 hr
May 23, 12:49 PM EDTMesoscale DiscussionSPC56 min
May 24, 7:11 PM EDTMesoscale DiscussionSPC64 min
May 28, 8:02 PM EDTAreal Flood AdvisoryCTP3 hr
May 28, 10:39 PM EDTAreal Flood AdvisoryCTP3 hr
May 29, 11:57 AM EDTSpecial Weather StatementCTP48 min
May 29, 12:20 PM EDTMesoscale DiscussionSPC55 min
May 29, 1:14 PM EDTSpecial Weather StatementCTP91 min
May 29, 2:13 PM EDTSevere Thunderstorm WarningCTP62 min
Jun 2, 11:26 PM EDTSpecial Weather StatementCTP49 min
Jun 2, 11:40 PM EDTSevere Thunderstorm WarningCTP65 min
Jun 3, 12:26 AM EDTSevere Thunderstorm WarningCTP79 min
Jun 9, 12:01 PM EDTSpecial Weather StatementCTP119 min
Jun 9, 1:31 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 9, 2:00 PM EDTSevere Thunderstorm WarningCTP60 min
Jun 9, 2:41 PM EDTSevere Thunderstorm WarningCTP64 min
Jun 9, 3:12 PM EDTSevere Thunderstorm WarningCTP33 min
Jun 9, 3:20 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 9, 3:40 PM EDTMesoscale DiscussionSPC65 min
Jun 9, 3:44 PM EDTSevere Thunderstorm WarningCTP49 min
Jun 9, 3:55 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 10, 1:57 PM EDTMesoscale DiscussionSPC93 min
Jun 10, 8:06 PM EDTSpecial Weather StatementCTP54 min
Jun 10, 9:06 PM EDTAreal Flood AdvisoryCTP114 min
Jun 10, 9:08 PM EDTSpecial Weather StatementCTP22 min
Jun 10, 9:23 PM EDTFlash Flood WarningCTP3 hr
Jun 11, 4:04 AM EDTFlash Flood WatchCTP23 hr
Jun 11, 11:51 AM EDTMesoscale DiscussionSPC84 min
Jun 11, 8:22 PM EDTSpecial Weather StatementCTP53 min
Jun 13, 5:50 PM EDTSpecial Weather StatementCTP55 min
Jun 13, 6:06 PM EDTSevere Thunderstorm WarningCTP54 min
Jun 20, 7:15 AM EDTAreal Flood AdvisoryCTP3 hr
Jun 26, 2:19 PM EDTMesoscale DiscussionSPC56 min
Jun 26, 2:42 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 26, 3:11 PM EDTSpecial Weather StatementCTP34 min
Jun 26, 4:19 PM EDTSpecial Weather StatementCTP26 min
Jun 26, 7:02 PM EDTSpecial Weather StatementCTP43 min
Jun 26, 7:33 PM EDTMesoscale DiscussionSPC57 min
Jun 26, 9:11 PM EDTMesoscale DiscussionSPC64 min
Jun 30, 12:36 PM EDTSpecial Weather StatementCTP39 min
Jun 30, 12:51 PM EDTSevere Thunderstorm WarningCTP54 min
Jul 11, 2:48 PM EDTSpecial Weather StatementCTP57 min
Jul 11, 3:01 PM EDTSevere Thunderstorm WarningCTP59 min
Jul 11, 3:38 PM EDTAreal Flood AdvisoryCTP112 min
Jul 11, 7:13 PM EDTSpecial Weather StatementCTP62 min
Jul 21, 1:56 PM EDTMesoscale DiscussionSPC64 min
Jul 22, 7:17 PM EDTAreal Flood AdvisoryCTP110 min
Jul 23, 3:21 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 23, 4:57 PM EDTFlash Flood WarningCTP3 hr
Jul 24, 2:29 PM EDTSpecial Weather StatementCTP61 min
Jul 24, 3:20 PM EDTSpecial Weather StatementCTP40 min
Jul 24, 3:34 PM EDTMesoscale DiscussionSPC86 min
Jul 24, 3:58 PM EDTSpecial Weather StatementCTP47 min
Jul 24, 4:20 PM EDTSevere Thunderstorm WarningCTP55 min
Jul 24, 4:56 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 25, 3:05 PM EDTMesoscale DiscussionSPC55 min
Jul 25, 3:50 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 26, 3:40 AM EDTFlash Flood WatchCTP16 hr
Jul 26, 3:51 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 29, 4:37 PM EDTSpecial Weather StatementCTP68 min
Jul 29, 4:52 PM EDTSevere Thunderstorm WarningCTP53 min
Jul 29, 5:01 PM EDTSpecial Weather StatementCTP14 min
Jul 29, 5:28 PM EDTSpecial Weather StatementCTP17 min
Jul 29, 5:38 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 29, 5:46 PM EDTSevere Thunderstorm WarningCTP59 min
Aug 1, 4:05 AM EDTDense Fog AdvisoryCTP5 hr
Aug 2, 12:36 AM EDTAreal Flood AdvisoryCTP3 hr
Aug 2, 5:08 AM EDTFlash Flood WatchCTP10 hr
Aug 2, 6:38 PM EDTSpecial Weather StatementCTP52 min
Aug 2, 7:22 PM EDTSpecial Weather StatementCTP68 min
Aug 2, 8:11 PM EDTAreal Flood AdvisoryCTP94 min
Aug 9, 2:45 PM EDTMesoscale DiscussionSPC60 min
Aug 9, 3:09 PM EDTHeat AdvisoryCTP28 hr
Aug 9, 3:18 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 10, 5:09 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 10, 8:15 PM EDTMesoscale DiscussionSPC2 hr
Aug 12, 12:36 PM EDTMesoscale DiscussionSPC84 min
Aug 14, 4:04 AM EDTDense Fog AdvisoryCTP6 hr
Aug 15, 6:30 AM EDTDense Fog AdvisoryCTP4 hr
Aug 18, 3:09 PM EDTSpecial Weather StatementCTP36 min
Aug 19, 1:21 PM EDTMesoscale DiscussionSPC84 min
Aug 20, 5:17 PM EDTSpecial Weather StatementCTP58 min
Aug 21, 10:16 AM EDTSpecial Weather StatementCTP119 min
Oct 6, 2:59 PM EDTWind AdvisoryCTP29 hr
Oct 7, 12:16 PM EDTHigh Wind WarningCTP5 hr
Oct 13, 3:28 AM EDTFrost AdvisoryCTP30 hr
Oct 24, 5:25 AM EDTMesoscale DiscussionSPC95 min
Nov 26, 3:07 AM ESTDense Fog AdvisoryCTP6 hr
Dec 5, 4:27 AM ESTWinter Weather AdvisoryCTP14 hr
Dec 7, 2:41 PM ESTWinter Storm WatchCTP21 hr
Dec 8, 6:12 AM ESTWinter Weather AdvisoryCTP26 hr
Dec 9, 3:38 AM ESTWind AdvisoryCTP26 hr
Dec 12, 3:17 PM ESTFreezing Rain AdvisoryCTP25 hr
Dec 17, 10:08 PM ESTWinter Storm WatchCTP17 hr
Dec 18, 2:38 PM ESTWinter Storm WarningCTP32 hr
Dec 19, 12:34 AM ESTMesoscale DiscussionSPC5 hr
Dec 19, 6:57 AM ESTMesoscale DiscussionSPC6 hr
Dec 19, 12:27 PM ESTMesoscale DiscussionSPC6 hr
Dec 24, 2:05 PM ESTWinter Weather AdvisoryCTP29 hr
Dec 26, 8:56 AM ESTAreal Flood AdvisoryCTP6 hr
Dec 26, 10:58 PM ESTSpecial Weather StatementCTP4 hr
Dec 28, 2:33 PM ESTWind AdvisoryCTP28 hr
Dec 30, 2:45 PM ESTWinter Weather AdvisoryCTP19 hr
Dec 31, 6:40 PM ESTWinter Weather 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 archive20082010

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.