Alert archive / Pennsylvania / Somerset County

Weather alerts in Somerset County, Pennsylvania, 2017

124 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Somerset County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
124
Warnings
12
Watches
15
Advisories
52
Busiest month
March20 alerts
Busiest day
March 1, 20177 alerts

Over time

By month

Warning verification

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

Somerset County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings7614%1090%25 min
Flash flood warnings2150%367%79 min

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings16475%1040%19 min
NWS State College, PA: severe thunderstorm warnings19012136%34288%32 min
NWS State College, PA: flash flood warnings201525%4584%81 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 1, 3:06 PM ESTFreezing Rain AdvisoryCTP22 hr
Jan 4, 3:52 PM ESTWinter Weather AdvisoryCTP35 hr
Jan 7, 3:37 AM ESTWind Chill AdvisoryCTP31 hr
Jan 9, 2:41 PM ESTWinter Weather AdvisoryCTP37 hr
Jan 13, 3:49 AM ESTWinter Weather AdvisoryCTP44 hr
Jan 20, 3:43 AM ESTFreezing Rain AdvisoryCTP5 hr
Jan 23, 4:11 AM ESTWinter Weather AdvisoryCTP30 hr
Jan 24, 10:53 PM ESTFreezing Rain AdvisoryCTP5 hr
Jan 26, 3:54 AM ESTWinter Weather AdvisoryCTP50 hr
Jan 29, 7:26 AM ESTSpecial Weather StatementCTP64 min
Jan 30, 11:35 AM ESTSpecial Weather StatementCTP25 min
Jan 30, 12:10 PM ESTSpecial Weather StatementCTP80 min
Jan 30, 1:58 PM ESTWinter Weather AdvisoryCTP34 hr
Feb 7, 4:02 PM ESTWinter Storm WatchCTP12 hr
Feb 8, 4:13 AM ESTWinter Storm WarningCTP30 hr
Feb 8, 4:13 AM ESTWinter Weather AdvisoryCTP30 hr
Feb 8, 9:40 PM ESTMesoscale DiscussionSPC4 hr
Feb 12, 4:00 AM ESTWinter Weather AdvisoryCTP33 hr
Feb 12, 4:22 AM ESTWind AdvisoryCTP37 hr
Feb 12, 8:11 PM ESTSevere Thunderstorm WarningCTP64 min
Feb 15, 12:04 PM ESTWinter Weather AdvisoryCTP22 hr
Mar 1, 5:18 AM ESTSpecial Weather StatementCTP27 min
Mar 1, 6:21 AM ESTSpecial Weather StatementCTP24 min
Mar 1, 7:00 AM ESTAreal Flood AdvisoryCTP3 hr
Mar 1, 9:44 AM ESTMesoscale DiscussionSPC91 min
Mar 1, 10:38 AM ESTSevere Thunderstorm WatchSPC4 hr
Mar 1, 10:58 AM ESTSpecial Weather StatementCTP77 min
Mar 1, 3:43 PM ESTWind AdvisoryCTP17 hr
Mar 3, 1:58 PM ESTSpecial Weather StatementCTP62 min
Mar 3, 2:25 PM ESTSpecial Weather StatementCTP65 min
Mar 3, 2:54 PM ESTSpecial Weather StatementCTP66 min
Mar 7, 1:22 PM ESTWind AdvisoryCTP36 hr
Mar 9, 1:05 AM ESTWind AdvisoryCTP6 hr
Mar 9, 3:58 AM ESTWinter Weather AdvisoryCTP29 hr
Mar 10, 7:23 AM ESTSpecial Weather StatementCTP52 min
Mar 10, 8:20 AM ESTSpecial Weather StatementCTP55 min
Mar 10, 3:14 PM ESTSpecial Weather StatementCTP61 min
Mar 11, 8:54 PM ESTWinter Storm WatchCTP18 hr
Mar 12, 3:24 PM EDTWinter Storm WarningCTP48 hr
Mar 14, 2:56 PM EDTWinter Weather AdvisoryCTP41 hr
Mar 17, 3:40 PM EDTWinter Weather AdvisoryCTP19 hr
Apr 6, 3:34 AM EDTWinter Weather AdvisoryCTP34 hr
Apr 16, 2:15 PM EDTMesoscale DiscussionSPC3 hr
Apr 16, 7:33 PM EDTSpecial Weather StatementCTP27 min
Apr 20, 2:40 PM EDTMesoscale DiscussionSPC65 min
Apr 20, 3:23 PM EDTSpecial Weather StatementCTP52 min
May 1, 2:12 PM EDTTornado WatchSPC8 hr
May 1, 5:01 PM EDTSevere Thunderstorm WarningCTP29 min
May 1, 5:35 PM EDTSevere Thunderstorm WarningCTP25 min
May 1, 5:50 PM EDTAreal Flood AdvisoryCTP3 hr
May 2, 4:35 AM EDTWind AdvisoryCTP14 hr
May 5, 10:45 AM EDTAreal Flood AdvisoryCTP3 hr
May 19, 4:06 PM EDTSpecial Weather StatementCTP24 min
May 19, 4:56 PM EDTSpecial Weather StatementCTP34 min
May 28, 6:49 AM EDTDense Fog AdvisoryCTP2 hr
May 28, 11:19 AM EDTFlash Flood WatchCTP11 hr
May 28, 4:31 PM EDTAreal Flood AdvisoryCTP3 hr
May 28, 5:06 PM EDTFlash Flood WarningCTP3 hr
May 28, 7:56 PM EDTAreal Flood WarningCTP3 hr
May 30, 12:03 PM EDTMesoscale DiscussionSPC2 hr
May 30, 12:39 PM EDTSevere Thunderstorm WatchSPC6 hr
May 30, 1:22 PM EDTSevere Thunderstorm WarningCTP53 min
Jun 15, 11:50 AM EDTFlash Flood WatchCTP14 hr
Jun 15, 6:38 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 15, 6:48 PM EDTFlash Flood WarningCTP3 hr
Jun 15, 10:12 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 16, 1:12 AM EDTAreal Flood AdvisoryCTP2 hr
Jun 16, 4:31 PM EDTAreal Flood AdvisoryCTP3 hr
Jun 18, 3:31 PM EDTMesoscale DiscussionSPC2 hr
Jun 21, 2:38 PM EDTMesoscale DiscussionSPC3 hr
Jun 21, 3:20 PM EDTSpecial Weather StatementCTP25 min
Jun 23, 2:16 PM EDTFlash Flood WatchCTP13 hr
Jun 23, 2:20 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 23, 4:27 PM EDTSpecial Weather StatementCTP48 min
Jun 23, 4:53 PM EDTMesoscale DiscussionSPC2 hr
Jun 23, 7:50 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 6, 1:15 PM EDTFlash Flood WatchCTP13 hr
Jul 6, 6:42 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 7, 4:00 PM EDTSpecial Weather StatementCTP45 min
Jul 14, 12:21 AM EDTSpecial Weather StatementCTP39 min
Jul 14, 5:41 AM EDTSpecial Weather StatementCTP49 min
Jul 14, 6:19 AM EDTAreal Flood AdvisoryCTP3 hr
Jul 14, 1:40 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 14, 4:23 PM EDTMesoscale DiscussionSPC67 min
Jul 22, 8:34 AM EDTMesoscale DiscussionSPC86 min
Jul 22, 8:54 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 23, 10:36 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 24, 2:17 PM EDTMesoscale DiscussionSPC118 min
Jul 27, 1:46 PM EDTFlash Flood WatchCTP41 hr
Jul 28, 4:22 PM EDTAreal Flood AdvisoryCTP113 min
Jul 28, 6:00 PM EDTSpecial Weather StatementCTP60 min
Jul 28, 8:25 PM EDTAreal Flood AdvisoryCTP3 hr
Jul 29, 5:06 AM EDTAreal Flood AdvisoryCTP3 hr
Aug 4, 1:25 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 4, 4:04 PM EDTSevere Thunderstorm WarningCTP56 min
Aug 4, 7:41 PM EDTMesoscale DiscussionSPC2 hr
Aug 7, 8:43 AM EDTAreal Flood AdvisoryCTP4 hr
Aug 12, 1:41 PM EDTMesoscale DiscussionSPC2 hr
Aug 19, 2:13 PM EDTMesoscale DiscussionSPC3 hr
Aug 19, 2:45 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 19, 4:43 PM EDTMesoscale DiscussionSPC2 hr
Aug 19, 5:17 PM EDTSpecial Weather StatementCTP58 min
Aug 19, 5:39 PM EDTSevere Thunderstorm WarningCTP81 min
Aug 22, 12:39 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 22, 2:44 PM EDTMesoscale DiscussionSPC91 min
Aug 22, 4:39 PM EDTMesoscale DiscussionSPC66 min
Aug 22, 5:03 PM EDTSpecial Weather StatementCTP27 min
Aug 22, 5:15 PM EDTSevere Thunderstorm WarningCTP54 min
Sep 15, 2:27 AM EDTDense Fog AdvisoryCTP7 hr
Sep 16, 6:50 AM EDTDense Fog AdvisoryCTP3 hr
Sep 30, 3:56 AM EDTFrost AdvisoryCTP29 hr
Oct 15, 8:10 PM EDTSpecial Weather StatementCTP50 min
Oct 29, 4:16 AM EDTWind AdvisoryCTP32 hr
Nov 7, 12:33 PM ESTSpecial Weather StatementCTP57 min
Nov 18, 4:05 AM ESTWind AdvisoryCTP32 hr
Dec 11, 4:25 AM ESTWinter Weather AdvisoryCTP57 hr
Dec 13, 4:05 AM ESTWinter Weather AdvisoryCTP28 hr
Dec 15, 8:12 PM ESTSpecial Weather StatementCTP33 min
Dec 24, 3:22 AM ESTWinter Weather AdvisoryCTP37 hr
Dec 24, 11:12 AM ESTWind AdvisoryCTP29 hr
Dec 27, 2:19 PM ESTWind Chill AdvisoryCTP21 hr
Dec 29, 2:59 PM ESTWinter Weather AdvisoryCTP30 hr
Dec 30, 4:31 AM ESTWind Chill AdvisoryCTP4 days
Dec 30, 5:50 PM ESTSpecial Weather StatementCTP55 min

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 archive20162018

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.