Alert archive / Pennsylvania / Blair County

Weather alerts in Blair County, Pennsylvania, 2011

196 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Blair County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts
196
Warnings
48
Watches
32
Advisories
45
Busiest month
April41 alerts
Busiest day
April 26, 20119 alerts

Over time

By month

Warning verification

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

Blair County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings261638%888%24 min
Flash flood warnings7614%4100%105 min

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings40783%2335%22 min
NWS State College, PA: severe thunderstorm warnings24312748%33283%28 min
NWS State College, PA: flash flood warnings794642%11476%101 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, 7:26 AM ESTSpecial Weather StatementCTP64 min
Jan 7, 2:33 PM ESTWinter Weather AdvisoryCTP37 hr
Jan 10, 3:14 PM ESTWinter Weather AdvisoryCTP3 days
Jan 15, 10:50 PM ESTSpecial Weather StatementCTP85 min
Jan 17, 6:03 AM ESTWinter Weather AdvisoryCTP33 hr
Jan 18, 8:34 PM ESTWinter Weather AdvisoryCTP11 hr
Jan 20, 4:13 AM ESTWinter Weather AdvisoryCTP40 hr
Jan 25, 2:24 PM ESTWinter Weather AdvisoryCTP33 hr
Jan 26, 7:30 AM ESTMesoscale DiscussionSPC5 hr
Jan 26, 4:55 PM ESTSpecial Weather StatementCTP80 min
Jan 30, 12:16 AM ESTSpecial Weather StatementCTP119 min
Jan 30, 7:18 PM ESTWinter Storm WatchCTP20 hr
Jan 31, 3:07 PM ESTWinter Storm WarningCTP40 hr
Feb 1, 2:42 AM ESTMesoscale DiscussionSPC4 hr
Feb 1, 8:39 PM ESTMesoscale DiscussionSPC6 hr
Feb 2, 3:43 AM ESTWind AdvisoryCTP18 hr
Feb 4, 2:47 PM ESTWinter Weather AdvisoryCTP32 hr
Feb 8, 4:24 AM ESTWind AdvisoryCTP15 hr
Feb 13, 3:14 PM ESTWind AdvisoryCTP30 hr
Feb 18, 11:00 AM ESTHigh Wind WatchCTP10 hr
Feb 18, 9:18 PM ESTHigh Wind WarningCTP24 hr
Feb 20, 4:29 AM ESTWinter Weather AdvisoryCTP30 hr
Feb 20, 7:46 PM ESTMesoscale DiscussionSPC4 hr
Feb 21, 5:06 AM ESTWinter Storm WatchCTP8 hr
Feb 21, 1:22 PM ESTWinter Storm WarningCTP17 hr
Feb 21, 5:58 PM ESTMesoscale DiscussionSPC4 hr
Feb 24, 3:00 AM ESTFlood WatchCTP30 hr
Feb 24, 10:06 PM ESTWind AdvisoryCTP20 hr
Feb 27, 1:59 PM ESTFlood WatchCTP22 hr
Feb 28, 6:26 AM ESTSpecial Weather StatementCTP19 min
Feb 28, 8:04 AM ESTAreal Flood AdvisoryCTP6 hr
Mar 4, 3:33 AM ESTFlood WatchCTP3 days
Mar 5, 10:50 PM ESTWinter Weather AdvisoryCTP32 hr
Mar 6, 2:50 PM ESTAreal Flood AdvisoryCTP4 hr
Mar 6, 3:06 PM ESTAreal Flood AdvisoryCTP4 hr
Mar 6, 8:00 PM ESTAreal Flood AdvisoryCTP6 hr
Mar 8, 4:25 AM ESTFlood WatchCTP66 hr
Mar 8, 2:18 PM ESTWinter Weather AdvisoryCTP38 hr
Mar 10, 4:45 AM ESTRiver Flood WarningCTP38 hr
Mar 10, 4:31 PM ESTAreal Flood WarningCTP10 hr
Mar 10, 4:46 PM ESTSpecial Weather StatementCTP44 min
Mar 10, 5:20 PM ESTSpecial Weather StatementCTP25 min
Mar 11, 12:22 AM ESTRiver Flood WarningCTP10 hr
Mar 11, 2:26 AM ESTAreal Flood WarningCTP8 hr
Mar 21, 4:27 AM EDTSpecial Weather StatementCTP63 min
Mar 23, 3:54 PM EDTMesoscale DiscussionSPC96 min
Mar 23, 4:13 PM EDTSevere Thunderstorm WatchSPC5 hr
Mar 23, 5:01 PM EDTSpecial Weather StatementCTP29 min
Mar 23, 6:04 PM EDTSevere Thunderstorm WarningCTP26 min
Mar 23, 6:31 PM EDTAreal Flood AdvisoryCTP3 hr
Apr 4, 6:55 PM EDTSevere Thunderstorm WarningCTP35 min
Apr 11, 2:11 PM EDTSpecial Weather StatementCTP34 min
Apr 12, 10:16 PM EDTAreal Flood AdvisoryCTP3 hr
Apr 13, 11:48 AM EDTAreal Flood AdvisoryCTP4 hr
Apr 15, 12:54 PM EDTFlash Flood WatchCTP33 hr
Apr 15, 1:56 PM EDTWind AdvisoryCTP32 hr
Apr 16, 2:52 PM EDTAreal Flood AdvisoryCTP3 hr
Apr 16, 4:41 PM EDTTornado WatchSPC6 hr
Apr 16, 9:40 PM EDTWind AdvisoryCTP22 hr
Apr 16, 10:02 PM EDTRiver Flood WarningCTP12 hr
Apr 16, 10:02 PM EDTRiver Flood WarningCTP3 hr
Apr 17, 11:29 PM EDTSpecial Weather StatementCTP3 hr
Apr 19, 8:39 PM EDTSpecial Weather StatementCTP66 min
Apr 19, 9:05 PM EDTSevere Thunderstorm WarningCTP40 min
Apr 20, 3:45 PM EDTMesoscale DiscussionSPC30 min
Apr 20, 4:03 PM EDTSevere Thunderstorm WatchSPC4 hr
Apr 22, 2:51 PM EDTFlash Flood WatchCTP30 hr
Apr 25, 1:52 PM EDTMesoscale DiscussionSPC83 min
Apr 25, 2:47 PM EDTSevere Thunderstorm WatchSPC7 hr
Apr 25, 6:00 PM EDTMesoscale DiscussionSPC60 min
Apr 26, 1:18 PM EDTMesoscale DiscussionSPC57 min
Apr 26, 1:49 PM EDTSevere Thunderstorm WatchSPC7 hr
Apr 26, 3:21 PM EDTSevere Thunderstorm WarningCTP54 min
Apr 26, 4:10 PM EDTSevere Thunderstorm WarningCTP65 min
Apr 26, 4:12 PM EDTMesoscale DiscussionSPC63 min
Apr 26, 5:03 PM EDTSevere Thunderstorm WarningCTP57 min
Apr 26, 6:21 PM EDTSpecial Weather StatementCTP39 min
Apr 26, 6:51 PM EDTMesoscale DiscussionSPC54 min
Apr 26, 6:58 PM EDTSevere Thunderstorm WarningCTP62 min
Apr 26, 8:27 PM EDTSpecial Weather StatementCTP48 min
Apr 27, 11:16 AM EDTFlash Flood WatchCTP23 hr
Apr 27, 1:24 PM EDTMesoscale DiscussionSPC96 min
Apr 27, 3:10 PM EDTTornado WatchSPC7 hr
Apr 27, 5:43 PM EDTSevere Thunderstorm WarningCTP62 min
Apr 27, 6:45 PM EDTSevere Thunderstorm WarningCTP60 min
Apr 27, 6:50 PM EDTMesoscale DiscussionSPC55 min
Apr 27, 10:45 PM EDTMesoscale DiscussionSPC60 min
Apr 27, 11:50 PM EDTSevere Thunderstorm WatchSPC7 hr
Apr 28, 1:21 AM EDTSevere Thunderstorm WarningCTP39 min
Apr 28, 1:44 AM EDTFlash Flood WarningCTP4 hr
Apr 28, 2:20 AM EDTMesoscale DiscussionSPC55 min
May 3, 3:54 AM EDTFlash Flood WatchCTP22 hr
May 3, 4:42 PM EDTFlash Flood WarningCTP3 hr
May 17, 6:50 PM EDTSevere Thunderstorm WarningCTP40 min
May 17, 7:23 PM EDTSpecial Weather StatementCTP37 min
May 17, 7:47 PM EDTAreal Flood AdvisoryCTP88 min
May 18, 11:55 AM EDTMesoscale DiscussionSPC65 min
May 18, 12:55 PM EDTSevere Thunderstorm WatchSPC8 hr
May 18, 3:08 PM EDTMesoscale DiscussionSPC67 min
May 23, 10:33 AM EDTMesoscale DiscussionSPC87 min
May 23, 10:48 AM EDTSevere Thunderstorm WatchSPC9 hr
May 23, 2:33 PM EDTMesoscale DiscussionSPC87 min
May 23, 3:22 PM EDTSpecial Weather StatementCTP23 min
May 24, 1:13 AM EDTSpecial Weather StatementCTP92 min
May 24, 10:49 PM EDTAreal Flood AdvisoryCTP116 min
May 25, 12:45 AM EDTAreal Flood AdvisoryCTP2 hr
May 26, 2:53 PM EDTTornado WatchSPC7 hr
May 26, 5:35 PM EDTSevere Thunderstorm WarningCTP55 min
May 26, 5:49 PM EDTMesoscale DiscussionSPC56 min
May 26, 6:28 PM EDTSevere Thunderstorm WarningCTP62 min
May 26, 10:59 PM EDTAreal Flood AdvisoryCTP3 hr
May 27, 12:57 PM EDTSevere Thunderstorm WatchSPC9 hr
May 27, 3:51 PM EDTSevere Thunderstorm WarningCTP54 min
May 27, 4:46 PM EDTSevere Thunderstorm WarningCTP59 min
May 27, 5:07 PM EDTFlash Flood WarningCTP3 hr
Jun 1, 10:02 AM EDTSevere Thunderstorm WatchSPC7 hr
Jun 1, 1:18 PM EDTSpecial Weather StatementCTP57 min
Jun 4, 2:49 PM EDTSpecial Weather StatementCTP26 min
Jun 9, 10:36 AM EDTMesoscale DiscussionSPC84 min
Jun 9, 11:33 AM EDTMesoscale DiscussionSPC57 min
Jun 9, 12:53 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 9, 2:55 PM EDTSevere Thunderstorm WarningCTP2 hr
Jun 9, 4:12 PM EDTSpecial Weather StatementCTP33 min
Jun 9, 6:17 PM EDTMesoscale DiscussionSPC58 min
Jun 10, 3:35 PM EDTSevere Thunderstorm WarningCTP55 min
Jun 10, 4:23 PM EDTSevere Thunderstorm WarningCTP82 min
Jun 10, 5:28 PM EDTMesoscale DiscussionSPC92 min
Jun 11, 3:51 PM EDTSpecial Weather StatementCTP54 min
Jun 16, 6:01 PM EDTMesoscale DiscussionSPC89 min
Jun 16, 7:32 PM EDTSpecial Weather StatementCTP73 min
Jun 20, 11:43 PM EDTSpecial Weather StatementCTP62 min
Jun 23, 3:27 PM EDTMesoscale DiscussionSPC2 hr
Jun 28, 1:19 PM EDTMesoscale DiscussionSPC86 min
Jul 7, 3:12 PM EDTSpecial Weather StatementCTP33 min
Jul 8, 11:44 AM EDTMesoscale DiscussionSPC61 min
Jul 11, 5:47 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 11, 5:52 PM EDTSevere Thunderstorm WarningCTP53 min
Jul 11, 5:54 PM EDTMesoscale DiscussionSPC96 min
Jul 11, 6:48 PM EDTSevere Thunderstorm WarningCTP57 min
Jul 20, 1:43 PM EDTHeat AdvisoryCTP30 hr
Jul 20, 1:43 PM EDTHeat AdvisoryCTP54 hr
Jul 22, 4:08 AM EDTHeat AdvisoryCTP40 hr
Jul 22, 5:37 PM EDTSevere Thunderstorm WatchSPC4 hr
Jul 22, 8:13 PM EDTMesoscale DiscussionSPC62 min
Jul 25, 4:16 PM EDTSpecial Weather StatementCTP44 min
Jul 25, 5:42 PM EDTMesoscale DiscussionSPC63 min
Jul 29, 2:06 PM EDTMesoscale DiscussionSPC84 min
Jul 29, 2:40 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 29, 3:52 PM EDTSpecial Weather StatementCTP23 min
Jul 29, 4:04 PM EDTSevere Thunderstorm WarningCTP56 min
Jul 29, 4:40 PM EDTMesoscale DiscussionSPC95 min
Aug 7, 3:53 PM EDTMesoscale DiscussionSPC67 min
Aug 13, 2:07 PM EDTMesoscale DiscussionSPC113 min
Aug 14, 6:04 PM EDTSpecial Weather StatementCTP26 min
Aug 19, 12:15 PM EDTSpecial Weather StatementCTP45 min
Aug 19, 12:17 PM EDTSevere Thunderstorm WarningCTP58 min
Aug 19, 12:43 PM EDTMesoscale DiscussionSPC62 min
Aug 19, 12:53 PM EDTSevere Thunderstorm WarningCTP52 min
Aug 19, 1:12 PM EDTAreal Flood AdvisoryCTP3 hr
Aug 19, 1:54 PM EDTSevere Thunderstorm WarningCTP66 min
Aug 20, 4:15 AM EDTDense Fog AdvisoryCTP7 hr
Aug 21, 12:52 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 25, 2:31 AM EDTMesoscale DiscussionSPC119 min
Aug 25, 5:55 AM EDTSpecial Weather StatementCTP35 min
Sep 4, 1:33 PM EDTMesoscale DiscussionSPC87 min
Sep 4, 5:23 PM EDTAreal Flood AdvisoryCTP3 hr
Sep 4, 5:55 PM EDTSpecial Weather StatementCTP65 min
Sep 5, 9:07 PM EDTFlood WatchCTP71 hr
Sep 6, 12:00 PM EDTRiver Flood WarningCTP42 hr
Sep 6, 12:00 PM EDTRiver Flood WarningCTP32 hr
Sep 6, 12:06 PM EDTAreal Flood WarningCTP34 hr
Sep 7, 2:53 AM EDTAreal Flood AdvisoryCTP6 hr
Sep 8, 7:59 PM EDTFlash Flood WatchCTP8 hr
Sep 9, 5:30 PM EDTFlash Flood WarningCTP3 hr
Sep 9, 6:07 PM EDTFlash Flood WarningCTP3 hr
Sep 9, 6:54 PM EDTFlash Flood WarningCTP3 hr
Sep 9, 8:19 PM EDTFlash Flood WarningCTP3 hr
Sep 9, 10:41 PM EDTRiver Flood WarningCTP15 hr
Sep 9, 10:41 PM EDTRiver Flood WarningCTP6 hr
Sep 12, 12:29 AM EDTDense Fog AdvisoryCTP10 hr
Sep 23, 1:15 AM EDTDense Fog AdvisoryCTP9 hr
Sep 23, 9:32 PM EDTDense Fog AdvisoryCTP6 hr
Sep 27, 4:37 AM EDTSevere Thunderstorm WarningCTP53 min
Sep 27, 5:32 AM EDTSpecial Weather StatementCTP43 min
Sep 27, 6:09 AM EDTSpecial Weather StatementCTP36 min
Sep 27, 6:21 AM EDTSevere Thunderstorm WarningCTP28 min
Sep 27, 9:05 AM EDTAreal Flood AdvisoryCTP115 min
Sep 27, 9:12 AM EDTFlash Flood WatchCTP40 hr
Sep 28, 4:38 PM EDTAreal Flood AdvisoryCTP3 hr
Oct 6, 1:09 PM EDTFrost AdvisoryCTP19 hr
Oct 22, 5:22 AM EDTFrost AdvisoryCTP28 hr
Oct 28, 2:12 AM EDTWinter Storm WatchCTP11 hr
Oct 28, 1:08 PM EDTWinter Storm WarningCTP33 hr
Nov 23, 12:04 AM ESTAreal Flood AdvisoryCTP6 hr
Nov 23, 6:03 AM ESTAreal Flood AdvisoryCTP117 min
Dec 7, 4:51 AM ESTWinter Weather AdvisoryCTP20 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 archive20102012

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.