Alert archive / Pennsylvania / Union County

Weather alerts in Union County, Pennsylvania, 2026

119 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Union County and its neighbors

Each county as a circle sized by its count in 2026. Tap one for its archive.

Alerts
119
Warnings
34
Watches
27
Advisories
25
Busiest month
July22 alerts
Busiest day
September 3, 202613 alerts

Over time

By month

Warning verification

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

Union County, 2026

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings17170%2100%20 min
Flash flood warnings330%6100%87 min

Each office's whole area, 2026

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings461274%2075%11 min
NWS State College, PA: severe thunderstorm warnings35225827%75386%23 min
NWS State College, PA: flash flood warnings945937%19393%70 min

An office's figures cover every county it serves, including across state lines.

The year is still running; reports filed late and damage surveys can still change these figures.

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
Dec 31, 11:26 PM ESTMesoscale DiscussionSPC4 hr
Jan 1, 1:12 AM ESTSnow Squall WarningCTP63 min
Jan 1, 1:52 AM ESTSnow Squall WarningCTP68 min
Jan 2, 9:36 AM ESTSpecial Weather StatementCTP39 min
Jan 19, 11:50 AM ESTMesoscale DiscussionSPC4 hr
Jan 19, 3:19 PM ESTSnow Squall WarningCTP26 min
Jan 21, 6:12 PM ESTSpecial Weather StatementCTP33 min
Jan 22, 2:06 AM ESTWinter Storm WatchCTP32 hr
Jan 22, 12:09 PM ESTCold Weather AdvisoryCTP46 hr
Jan 23, 10:20 AM ESTWinter Storm WarningCTP64 hr
Jan 25, 6:01 AM ESTMesoscale DiscussionSPC6 hr
Jan 25, 11:55 AM ESTMesoscale DiscussionSPC4 hr
Jan 26, 2:14 AM ESTCold Weather AdvisoryCTP35 hr
Jan 27, 1:16 AM ESTCold Weather AdvisoryCTP33 hr
Jan 28, 1:20 AM ESTCold Weather AdvisoryCTP35 hr
Jan 29, 1:12 AM ESTCold Weather AdvisoryCTP33 hr
Jan 30, 1:08 AM ESTCold Weather AdvisoryCTP34 hr
Jan 31, 1:32 AM ESTCold Weather AdvisoryCTP32 hr
Feb 5, 2:02 AM ESTExtreme Cold WatchCTP24 hr
Feb 6, 2:03 AM ESTCold Weather AdvisoryCTP12 hr
Feb 6, 2:03 AM ESTExtreme Cold WarningCTP56 hr
Feb 6, 2:03 AM ESTWind AdvisoryCTP44 hr
Feb 8, 1:12 PM ESTCold Weather AdvisoryCTP20 hr
Feb 18, 8:02 PM ESTDense Fog AdvisoryCTP15 hr
Feb 21, 1:43 PM ESTWinter Storm WatchCTP9 hr
Feb 21, 1:43 PM ESTWinter Storm WarningCTP67 hr
Feb 21, 11:09 PM ESTWinter Weather AdvisoryCTP35 hr
Mar 2, 2:01 AM ESTWinter Weather AdvisoryCTP38 hr
Mar 3, 5:58 AM ESTMesoscale DiscussionSPC5 hr
Mar 4, 8:37 PM ESTDense Fog AdvisoryCTP10 hr
Mar 11, 1:45 PM EDTTornado WatchSPC6 hr
Mar 12, 3:00 AM EDTWind AdvisoryCTP59 hr
Mar 16, 3:28 AM EDTWind AdvisoryCTP20 hr
Mar 16, 10:57 AM EDTMesoscale DiscussionSPC93 min
Mar 16, 11:30 AM EDTTornado WatchSPC6 hr
Mar 21, 3:30 AM EDTDense Fog AdvisoryCTP5 hr
Mar 22, 3:02 PM EDTMesoscale DiscussionSPC88 min
Mar 22, 3:44 PM EDTSevere Thunderstorm WatchSPC8 hr
Mar 22, 4:39 PM EDTSevere Thunderstorm WarningCTP36 min
Mar 22, 8:13 PM EDTSevere Thunderstorm WarningCTP32 min
Mar 31, 6:26 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 7, 1:47 AM EDTFreeze WatchCTP32 hr
Apr 7, 1:47 AM EDTFreeze WarningCTP31 hr
Apr 8, 9:25 AM EDTFreeze WarningCTP24 hr
Apr 11, 1:20 PM EDTFrost AdvisoryCTP19 hr
Apr 18, 12:33 PM EDTFreeze WatchCTP37 hr
Apr 20, 1:14 AM EDTFreeze WarningCTP32 hr
May 1, 12:56 PM EDTFrost AdvisoryCTP20 hr
May 2, 12:14 PM EDTFrost AdvisoryCTP21 hr
May 11, 12:37 PM EDTFrost AdvisoryCTP19 hr
May 13, 5:54 PM EDTMesoscale DiscussionSPC2 hr
May 26, 3:27 AM EDTDense Fog AdvisoryCTP5 hr
Jun 6, 1:03 PM EDTMesoscale DiscussionSPC87 min
Jun 6, 1:42 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 6, 3:52 PM EDTSevere Thunderstorm WarningCTP38 min
Jun 6, 3:57 PM EDTMesoscale DiscussionSPC2 hr
Jun 6, 4:28 PM EDTSevere Thunderstorm WarningCTP62 min
Jun 11, 3:02 PM EDTMesoscale DiscussionSPC118 min
Jun 11, 4:12 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 11, 6:15 PM EDTSevere Thunderstorm WarningCTP60 min
Jun 11, 7:06 PM EDTSevere Thunderstorm WarningCTP39 min
Jun 14, 5:41 PM EDTTornado WatchSPC4 hr
Jun 14, 8:08 PM EDTSevere Thunderstorm WarningCTP52 min
Jun 14, 8:46 PM EDTSpecial Weather StatementCTP29 min
Jun 14, 8:56 PM EDTSevere Thunderstorm Warning Considerable damage threatCTP64 min
Jun 18, 10:01 AM EDTSpecial Weather StatementCTP14 min
Jun 29, 2:22 AM EDTExtreme Heat WatchCTP24 hr
Jun 30, 2:43 AM EDTHeat AdvisoryCTP5 days
Jun 30, 2:43 AM EDTExtreme Heat WarningCTP5 days
Jul 3, 3:25 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 3, 4:34 PM EDTMesoscale DiscussionSPC116 min
Jul 3, 4:57 PM EDTSevere Thunderstorm WarningCTP48 min
Jul 3, 5:24 PM EDTSevere Thunderstorm Warning Considerable damage threatCTP51 min
Jul 3, 10:42 PM EDTSevere Thunderstorm WarningCTP63 min
Jul 3, 11:28 PM EDTSpecial Weather StatementCTP47 min
Jul 4, 3:05 PM EDTMesoscale DiscussionSPC2 hr
Jul 4, 3:28 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 4, 6:47 PM EDTMesoscale DiscussionSPC118 min
Jul 4, 7:37 PM EDTSevere Thunderstorm WarningCTP38 min
Jul 4, 8:11 PM EDTSevere Thunderstorm Warning Considerable damage threatCTP34 min
Jul 5, 3:17 AM EDTFlood WatchCTP52 hr
Jul 13, 2:04 AM EDTHeat AdvisoryCTP66 hr
Jul 15, 3:55 PM EDTMesoscale DiscussionSPC65 min
Jul 18, 9:21 AM EDTFlood WatchCTP13 hr
Jul 18, 1:02 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 18, 5:00 PM EDTSevere Thunderstorm WarningCTP45 min
Jul 18, 5:50 PM EDTSpecial Weather StatementCTP55 min
Jul 18, 7:25 PM EDTSpecial Weather StatementCTP20 min
Jul 28, 3:22 AM EDTSpecial Weather StatementCTP53 min
Jul 28, 12:08 PM EDTMesoscale DiscussionSPC2 hr
Jul 28, 12:51 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 2, 2:17 AM EDTFlood WatchCTP24 hr
Aug 2, 5:33 PM EDTFlash Flood WarningCTP3 hr
Aug 2, 8:25 PM EDTRiver Flood WarningCTP3 hr
Aug 6, 1:39 PM EDTMesoscale DiscussionSPC2 hr
Aug 10, 12:24 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 10, 1:38 PM EDTMesoscale DiscussionSPC2 hr
Aug 11, 2:40 PM EDTMesoscale DiscussionSPC2 hr
Aug 20, 8:25 AM EDTFlood WatchCTP10 hr
Aug 21, 12:33 AM EDTDense Fog AdvisoryCTP9 hr
Aug 27, 3:17 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 27, 7:26 PM EDTMesoscale DiscussionSPC94 min
Sep 1, 3:13 PM EDTMesoscale DiscussionSPC2 hr
Sep 1, 4:32 PM EDTSevere Thunderstorm WatchSPC7 hr
Sep 2, 9:23 AM EDTSevere Thunderstorm WatchSPC4 hr
Sep 2, 10:39 AM EDTSpecial Weather StatementCTP51 min
Sep 2, 8:48 PM EDTMesoscale DiscussionSPC87 min
Sep 2, 9:50 PM EDTSevere Thunderstorm WarningCTP40 min
Sep 2, 10:12 PM EDTFlash Flood WarningCTP3 hr
Sep 2, 10:51 PM EDTSevere Thunderstorm WarningCTP39 min
Sep 2, 11:26 PM EDTFlash Flood WarningCTP4 hr
Sep 2, 11:26 PM EDTSevere Thunderstorm WarningCTP49 min
Sep 3, 1:14 AM EDTAreal Flood WarningCTP6 hr
Sep 3, 1:26 AM EDTRiver Flood WarningCTP15 hr
Sep 3, 2:07 AM EDTMesoscale DiscussionSPC113 min
Sep 3, 2:42 AM EDTFlood WatchCTP20 hr
Sep 3, 3:23 AM EDTAreal Flood WarningCTP3 hr
Sep 3, 4:16 PM EDTMesoscale DiscussionSPC119 min
Sep 3, 4:33 PM EDTSevere Thunderstorm WatchSPC6 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 archive2025

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.