Alert archive / Pennsylvania / Blair County

Weather alerts in Blair County, Pennsylvania, 2018

136 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts
136
Warnings
27
Watches
17
Advisories
37
Busiest month
May27 alerts
Busiest day
May 12, 20189 alerts

Over time

By month

Warning verification

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

1 of 1 tornado warnings covering Blair County in 2018 had a tornado report inside them.

Blair County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings110%0
Severe thunderstorm warnings10910%450%50 min
Flash flood warnings2150%1100%40 min

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings22577%1050%7 min
NWS State College, PA: severe thunderstorm warnings1228134%24480%30 min
NWS State College, PA: flash flood warnings573637%8988%96 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 4, 3:46 AM ESTWind Chill AdvisoryCTP3 days
Jan 12, 4:46 AM ESTWinter Weather AdvisoryCTP29 hr
Jan 12, 5:34 PM ESTSpecial Weather StatementCTP26 min
Jan 12, 6:05 PM ESTSevere Thunderstorm WarningCTP55 min
Jan 12, 7:04 PM ESTMesoscale DiscussionSPC6 hr
Jan 15, 2:22 PM ESTWinter Weather AdvisoryCTP41 hr
Feb 3, 2:44 PM ESTWinter Weather AdvisoryCTP42 hr
Feb 5, 2:40 PM ESTWinter Storm WatchCTP24 hr
Feb 6, 3:57 AM ESTWinter Weather AdvisoryCTP38 hr
Feb 7, 5:28 AM ESTMesoscale DiscussionSPC5 hr
Feb 7, 11:25 AM ESTMesoscale DiscussionSPC6 hr
Feb 11, 12:01 AM ESTDense Fog AdvisoryCTP10 hr
Feb 15, 7:32 PM ESTAreal Flood AdvisoryCTP3 hr
Feb 15, 10:30 PM ESTAreal Flood AdvisoryCTP3 hr
Feb 16, 1:41 AM ESTAreal Flood AdvisoryCTP5 hr
Feb 16, 4:27 AM ESTRiver Flood WarningCTP22 hr
Feb 16, 6:49 AM ESTAreal Flood AdvisoryCTP3 hr
Feb 16, 8:15 AM ESTAreal Flood AdvisoryCTP3 hr
Feb 16, 1:22 PM ESTRiver Flood WarningCTP12 hr
Feb 16, 7:14 PM ESTWinter Weather AdvisoryCTP33 hr
Feb 22, 11:29 AM ESTFlood WatchCTP68 hr
Feb 25, 4:28 AM ESTAreal Flood AdvisoryCTP5 hr
Mar 1, 4:03 PM ESTHigh Wind WarningCTP30 hr
Mar 15, 12:26 PM EDTSpecial Weather StatementCTP49 min
Mar 20, 4:36 AM EDTWinter Storm WarningCTP39 hr
Mar 27, 5:00 AM EDTWinter Weather AdvisoryCTP12 hr
Mar 29, 2:28 AM EDTDense Fog AdvisoryCTP8 hr
Apr 1, 4:17 AM EDTWinter Weather AdvisoryCTP29 hr
Apr 3, 3:25 PM EDTWind AdvisoryCTP12 hr
Apr 3, 6:38 PM EDTMesoscale DiscussionSPC2 hr
Apr 3, 9:10 PM EDTSpecial Weather StatementCTP65 min
Apr 4, 3:36 AM EDTHigh Wind WarningCTP16 hr
Apr 16, 1:45 PM EDTSpecial Weather StatementCTP45 min
Apr 17, 6:02 PM EDTSpecial Weather StatementCTP58 min
Apr 27, 8:11 PM EDTSpecial Weather StatementCTP64 min
May 2, 4:45 AM EDTRed Flag WarningCTP16 hr
May 3, 5:28 PM EDTSpecial Weather StatementCTP32 min
May 4, 6:55 PM EDTSpecial Weather StatementCTP80 min
May 4, 8:23 PM EDTMesoscale DiscussionSPC67 min
May 7, 1:15 AM EDTDense Fog AdvisoryCTP8 hr
May 10, 2:24 PM EDTSpecial Weather StatementCTP81 min
May 10, 3:13 PM EDTSpecial Weather StatementCTP62 min
May 12, 2:47 PM EDTSevere Thunderstorm WatchSPC8 hr
May 12, 3:17 PM EDTSpecial Weather StatementCTP43 min
May 12, 3:23 PM EDTSevere Thunderstorm WarningCTP67 min
May 12, 4:19 PM EDTSevere Thunderstorm WarningCTP56 min
May 12, 4:58 PM EDTSpecial Weather StatementCTP32 min
May 12, 5:05 PM EDTMesoscale DiscussionSPC115 min
May 12, 5:48 PM EDTAreal Flood AdvisoryCTP3 hr
May 12, 6:12 PM EDTSpecial Weather StatementCTP48 min
May 12, 6:33 PM EDTSpecial Weather StatementCTP27 min
May 14, 11:56 AM EDTMesoscale DiscussionSPC64 min
May 14, 12:29 PM EDTSevere Thunderstorm WatchSPC9 hr
May 14, 3:26 PM EDTMesoscale DiscussionSPC2 hr
May 15, 11:43 AM EDTMesoscale DiscussionSPC3 hr
May 15, 12:26 PM EDTSevere Thunderstorm WatchSPC7 hr
May 15, 1:59 PM EDTSpecial Weather StatementCTP46 min
May 15, 2:11 PM EDTSevere Thunderstorm WarningCTP49 min
May 15, 2:14 PM EDTMesoscale DiscussionSPC2 hr
May 15, 2:34 PM EDTSevere Thunderstorm WarningCTP56 min
May 28, 5:59 PM EDTSpecial Weather StatementCTP31 min
May 28, 6:29 PM EDTSpecial Weather StatementCTP31 min
Jun 5, 3:05 PM EDTMesoscale DiscussionSPC2 hr
Jun 13, 6:10 PM EDTMesoscale DiscussionSPC95 min
Jun 13, 6:33 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 13, 8:07 PM EDTSpecial Weather StatementCTP23 min
Jun 13, 8:21 PM EDTSevere Thunderstorm WarningCTP39 min
Jun 13, 8:28 PM EDTTornado WarningCTP32 min
Jun 13, 8:43 PM EDTMesoscale DiscussionSPC62 min
Jun 27, 7:37 PM EDTMesoscale DiscussionSPC3 hr
Jun 27, 9:33 PM EDTSpecial Weather StatementCTP42 min
Jun 27, 9:57 PM EDTSpecial Weather StatementCTP48 min
Jun 29, 2:28 PM EDTHeat AdvisoryCTP4 days
Jul 2, 1:03 PM EDTMesoscale DiscussionSPC72 min
Jul 2, 1:39 PM EDTSpecial Weather StatementCTP81 min
Jul 2, 2:48 PM EDTSevere Thunderstorm WarningCTP57 min
Jul 2, 3:13 PM EDTAreal Flood AdvisoryCTP2 hr
Jul 2, 3:29 PM EDTFlash Flood WarningCTP2 hr
Jul 2, 3:35 PM EDTSevere Thunderstorm WarningCTP40 min
Jul 2, 4:05 PM EDTSevere Thunderstorm WarningCTP40 min
Jul 4, 9:54 AM EDTFlash Flood WatchCTP10 hr
Jul 5, 4:17 AM EDTFlash Flood WatchCTP30 hr
Jul 5, 1:37 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 23, 3:59 AM EDTFlash Flood WatchCTP4 days
Jul 30, 4:10 PM EDTAreal Flood AdvisoryCTP110 min
Aug 1, 4:06 AM EDTFlash Flood WatchCTP3 days
Aug 3, 8:11 AM EDTAreal Flood AdvisoryCTP3 hr
Aug 3, 9:05 AM EDTFlash Flood WarningCTP3 hr
Aug 3, 6:51 PM EDTRiver Flood WarningCTP9 hr
Aug 4, 2:59 AM EDTDense Fog AdvisoryCTP6 hr
Aug 13, 1:46 AM EDTFlash Flood WatchCTP43 hr
Aug 14, 4:20 AM EDTAreal Flood AdvisoryCTP115 min
Aug 21, 2:16 PM EDTMesoscale DiscussionSPC119 min
Aug 21, 2:41 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 21, 4:56 PM EDTMesoscale DiscussionSPC2 hr
Aug 31, 6:29 AM EDTAreal Flood AdvisoryCTP3 hr
Aug 31, 8:59 PM EDTAreal Flood AdvisoryCTP2 hr
Sep 6, 1:20 PM EDTMesoscale DiscussionSPC2 hr
Sep 7, 2:45 PM EDTSpecial Weather StatementCTP30 min
Sep 7, 3:14 PM EDTSpecial Weather StatementCTP31 min
Sep 7, 3:44 PM EDTSpecial Weather StatementCTP46 min
Sep 8, 3:33 AM EDTFlood WatchCTP64 hr
Sep 9, 7:37 AM EDTAreal Flood AdvisoryCTP3 hr
Sep 9, 9:24 AM EDTRiver Flood WarningCTP57 hr
Sep 9, 10:28 AM EDTAreal Flood WarningCTP24 hr
Sep 9, 3:51 PM EDTRiver Flood WarningCTP48 hr
Sep 10, 2:41 AM EDTAreal Flood WarningCTP9 hr
Sep 10, 10:19 AM EDTAreal Flood WarningCTP9 hr
Sep 17, 4:51 AM EDTFlash Flood WatchCTP31 hr
Sep 21, 7:04 PM EDTMesoscale DiscussionSPC116 min
Sep 21, 9:14 PM EDTSpecial Weather StatementCTP46 min
Oct 2, 2:26 PM EDTMesoscale DiscussionSPC2 hr
Oct 2, 2:55 PM EDTTornado WatchSPC8 hr
Oct 2, 4:43 PM EDTMesoscale DiscussionSPC2 hr
Oct 2, 7:24 PM EDTMesoscale DiscussionSPC81 min
Oct 2, 9:01 PM EDTSevere Thunderstorm WarningCTP44 min
Oct 8, 3:30 AM EDTDense Fog AdvisoryCTP7 hr
Oct 11, 10:12 AM EDTAreal Flood AdvisoryCTP3 hr
Oct 13, 1:13 PM EDTFrost AdvisoryCTP19 hr
Oct 17, 2:28 PM EDTFreeze WatchCTP13 hr
Oct 18, 3:14 AM EDTFrost AdvisoryCTP30 hr
Oct 21, 1:13 AM EDTSpecial Weather StatementCTP62 min
Nov 2, 3:12 AM EDTSpecial Weather StatementCTP33 min
Nov 2, 3:46 AM EDTSpecial Weather StatementCTP29 min
Nov 2, 4:16 AM EDTSpecial Weather StatementCTP29 min
Nov 10, 2:15 AM ESTWind AdvisoryCTP13 hr
Nov 10, 8:33 AM ESTSnow Squall WarningCTP42 min
Nov 10, 11:02 AM ESTSpecial Weather StatementCTP28 min
Nov 14, 4:31 AM ESTWinter Storm WatchCTP11 hr
Nov 14, 3:40 PM ESTWinter Storm WarningCTP38 hr
Nov 15, 9:56 AM ESTMesoscale DiscussionSPC6 hr
Nov 15, 4:39 PM ESTMesoscale DiscussionSPC6 hr
Nov 23, 11:02 AM ESTWinter Weather AdvisoryCTP27 hr
Nov 24, 10:08 AM ESTMesoscale DiscussionSPC5 hr
Nov 29, 1:26 PM ESTWinter Weather AdvisoryCTP24 hr
Dec 2, 7:37 PM ESTDense Fog AdvisoryCTP8 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 archive20172019

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.