Alert archive / Pennsylvania / Sullivan County

Weather alerts in Sullivan County, Pennsylvania, 2009

126 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Sullivan County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
126
Warnings
18
Watches
19
Advisories
42
Busiest month
August23 alerts
Busiest day
May 16, 20096 alerts

Over time

By month

Warning verification

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

Sullivan County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings6433%2100%6 min
Flash flood warnings110%0

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, 10:11 PM ESTIce Storm WarningCTP39 hr
Jan 5, 10:11 PM ESTWinter Weather AdvisoryCTP72 hr
Jan 7, 12:10 AM ESTMesoscale DiscussionSPC4 hr
Jan 8, 3:30 PM ESTWinter Storm WatchCTP23 hr
Jan 9, 2:32 PM ESTWinter Storm WarningCTP30 hr
Jan 9, 2:32 PM ESTWinter Weather AdvisoryCTP37 hr
Jan 10, 12:56 PM ESTMesoscale DiscussionSPC4 hr
Jan 14, 4:25 AM ESTWinter Weather AdvisoryCTP38 hr
Jan 15, 3:30 AM ESTWind Chill WarningCTP32 hr
Jan 15, 3:30 AM ESTWind Chill AdvisoryCTP56 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
Jan 28, 7:53 AM ESTMesoscale DiscussionSPC5 hr
Feb 11, 3:09 PM ESTWind AdvisoryCTP32 hr
Feb 11, 8:00 PM ESTMesoscale DiscussionSPC60 min
Feb 11, 8:19 PM ESTSevere Thunderstorm WatchSPC3 hr
Feb 17, 2:45 PM ESTWinter Weather AdvisoryCTP34 hr
Feb 18, 12:38 PM ESTMesoscale DiscussionSPC3 hr
Mar 2, 2:38 PM ESTWind Chill AdvisoryCTP18 hr
Mar 8, 3:29 PM EDTWind AdvisoryCTP24 hr
Mar 10, 4:07 AM EDTFlood WatchCTP23 hr
Mar 10, 3:48 PM EDTWind AdvisoryCTP28 hr
Mar 23, 4:48 AM EDTRed Flag WarningCTP15 hr
Mar 25, 7:08 AM EDTRed Flag WarningCTP9 hr
Mar 27, 3:55 AM EDTDense Fog AdvisoryCTP6 hr
Apr 3, 3:04 AM EDTHigh Wind WatchCTP9 hr
Apr 3, 11:47 AM EDTWind AdvisoryCTP28 hr
Apr 21, 5:54 PM EDTSpecial Weather StatementCTP51 min
Apr 28, 10:43 AM EDTRed Flag WarningCTP9 hr
May 9, 3:38 AM EDTWind AdvisoryCTP23 hr
May 10, 2:37 AM EDTFrost AdvisoryCTP29 hr
May 11, 2:59 PM EDTFrost AdvisoryCTP18 hr
May 12, 3:55 AM EDTFrost AdvisoryCTP29 hr
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, 4:29 PM EDTSpecial Weather StatementCTP31 min
May 16, 6:22 PM EDTSpecial Weather StatementCTP23 min
May 16, 6:29 PM EDTMesoscale DiscussionSPC2 hr
May 16, 9:50 PM EDTFreeze WatchCTP6 hr
May 17, 3:20 AM EDTFreeze WarningCTP30 hr
May 18, 3:28 PM EDTFreeze WarningCTP17 hr
May 23, 12:49 PM EDTMesoscale DiscussionSPC56 min
May 30, 3:37 PM EDTFreeze WatchCTP14 hr
May 31, 5:50 AM EDTFrost AdvisoryCTP26 hr
Jun 9, 11:48 AM EDTMesoscale DiscussionSPC87 min
Jun 9, 1:31 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 9, 3:40 PM EDTMesoscale DiscussionSPC65 min
Jun 11, 4:04 AM EDTFlash Flood WatchCTP23 hr
Jun 26, 12:32 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 26, 2:40 PM EDTSevere Thunderstorm WarningCTP65 min
Jun 26, 3:40 PM EDTSpecial Weather StatementCTP35 min
Jun 26, 3:55 PM EDTSpecial Weather StatementCTP35 min
Jun 26, 6:29 PM EDTMesoscale DiscussionSPC61 min
Jun 30, 8:59 AM EDTSpecial Weather StatementCTP61 min
Jun 30, 6:05 PM EDTSpecial Weather StatementCTP25 min
Jul 3, 2:02 PM EDTSpecial Weather StatementCTP88 min
Jul 7, 12:04 PM EDTSpecial Weather StatementCTP56 min
Jul 7, 1:01 PM EDTSpecial Weather StatementCTP59 min
Jul 11, 10:31 AM EDTMesoscale DiscussionSPC59 min
Jul 11, 5:13 PM EDTSpecial Weather StatementCTP62 min
Jul 11, 7:06 PM EDTMesoscale DiscussionSPC114 min
Jul 21, 1:56 PM EDTMesoscale DiscussionSPC64 min
Jul 23, 8:19 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 24, 2:20 PM EDTMesoscale DiscussionSPC115 min
Jul 24, 5:21 PM EDTSpecial Weather StatementCTP54 min
Jul 24, 6:44 PM EDTSevere Thunderstorm WarningCTP61 min
Jul 25, 3:50 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 25, 7:43 PM EDTMesoscale DiscussionSPC62 min
Jul 26, 4:17 PM EDTSpecial Weather StatementCTP28 min
Jul 29, 5:05 PM EDTMesoscale DiscussionSPC55 min
Jul 31, 7:22 AM EDTAreal Flood AdvisoryCTP3 hr
Jul 31, 10:03 AM EDTFlash Flood WarningCTP6 hr
Aug 1, 4:05 AM EDTDense Fog AdvisoryCTP5 hr
Aug 2, 5:08 AM EDTFlash Flood WatchCTP10 hr
Aug 9, 2:45 PM EDTMesoscale DiscussionSPC60 min
Aug 9, 3:18 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 9, 3:47 PM EDTSevere Thunderstorm WarningCTP43 min
Aug 9, 4:05 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 9, 7:11 PM EDTMesoscale DiscussionSPC2 hr
Aug 9, 10:44 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 9, 10:47 PM EDTMesoscale DiscussionSPC118 min
Aug 10, 5:09 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 10, 8:15 PM EDTMesoscale DiscussionSPC2 hr
Aug 11, 5:05 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 11, 5:11 PM EDTSpecial Weather StatementCTP64 min
Aug 12, 6:19 PM EDTSpecial Weather StatementCTP26 min
Aug 14, 4:04 AM EDTDense Fog AdvisoryCTP6 hr
Aug 14, 2:37 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 18, 2:32 PM EDTMesoscale DiscussionSPC88 min
Aug 18, 5:25 PM EDTSevere Thunderstorm WarningCTP80 min
Aug 19, 1:21 PM EDTMesoscale DiscussionSPC84 min
Aug 19, 2:52 PM EDTSpecial Weather StatementCTP53 min
Aug 19, 3:19 PM EDTSevere Thunderstorm WarningCTP56 min
Aug 19, 3:47 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 21, 12:21 PM EDTAreal Flood AdvisoryCTP114 min
Sep 19, 3:19 PM EDTFrost AdvisoryCTP18 hr
Sep 23, 6:16 PM EDTMesoscale DiscussionSPC89 min
Sep 28, 11:05 AM EDTSpecial Weather StatementCTP40 min
Sep 30, 2:11 PM EDTFrost AdvisoryCTP14 hr
Oct 1, 3:05 PM EDTFrost AdvisoryCTP16 hr
Oct 6, 2:59 PM EDTWind AdvisoryCTP29 hr
Oct 7, 5:39 AM EDTSpecial Weather StatementCTP51 min
Oct 10, 3:49 AM EDTFrost AdvisoryCTP29 hr
Oct 10, 2:45 PM EDTFreeze WatchCTP24 hr
Oct 11, 2:51 PM EDTFreeze WarningCTP17 hr
Oct 14, 3:35 PM EDTWinter Storm WatchCTP13 hr
Oct 15, 4:26 AM EDTWinter Storm WarningCTP34 hr
Oct 15, 4:26 AM EDTWinter Weather AdvisoryCTP65 hr
Nov 26, 3:07 AM ESTDense Fog AdvisoryCTP6 hr
Dec 3, 4:48 AM ESTSevere Thunderstorm WarningCTP42 min
Dec 5, 4:27 AM ESTWinter Weather AdvisoryCTP14 hr
Dec 8, 6:12 AM ESTWinter Weather AdvisoryCTP26 hr
Dec 8, 11:32 PM ESTMesoscale DiscussionSPC6 hr
Dec 9, 3:38 AM ESTWind AdvisoryCTP26 hr
Dec 10, 9:49 PM ESTWind Chill AdvisoryCTP10 hr
Dec 12, 3:17 PM ESTFreezing Rain AdvisoryCTP25 hr
Dec 13, 5:16 AM ESTMesoscale DiscussionSPC4 hr
Dec 15, 7:59 PM ESTSpecial Weather StatementCTP91 min
Dec 17, 10:08 PM ESTWinter Storm WatchCTP17 hr
Dec 18, 2:38 PM ESTWinter Weather AdvisoryCTP32 hr
Dec 24, 2:05 PM ESTWinter Weather AdvisoryCTP29 hr
Dec 27, 3:58 PM ESTWinter Weather AdvisoryCTP14 hr
Dec 28, 2:33 PM ESTWind AdvisoryCTP28 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.