Alert archive / Pennsylvania / Mifflin County

Weather alerts in Mifflin County, Pennsylvania, 2020

107 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Mifflin County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts
107
Warnings
18
Watches
13
Advisories
21
Busiest month
June20 alerts
Busiest day
June 3, 20208 alerts

Over time

By month

Warning verification

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

0 of 1 tornado warnings covering Mifflin County in 2020 had a tornado report inside them.

Mifflin County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings11109%786%15 min
Flash flood warnings00

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS State College, PA: tornado warnings30100%0
NWS State College, PA: severe thunderstorm warnings16312821%42276%23 min
NWS State College, PA: flash flood warnings10640%2592%57 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 8, 5:50 AM ESTSpecial Weather StatementCTP55 min
Jan 8, 6:53 AM ESTSpecial Weather StatementCTP67 min
Jan 8, 8:27 AM ESTSnow Squall WarningCTP48 min
Jan 8, 9:55 AM ESTSnow Squall WarningCTP35 min
Jan 8, 11:38 AM ESTSpecial Weather StatementCTP22 min
Jan 8, 12:00 PM ESTSpecial Weather StatementCTP45 min
Jan 11, 4:07 AM ESTHigh Wind WatchCTP10 hr
Jan 11, 4:07 AM ESTWind AdvisoryCTP30 hr
Jan 15, 2:23 PM ESTWind AdvisoryCTP29 hr
Jan 16, 4:30 PM ESTSpecial Weather StatementCTP45 min
Jan 16, 9:35 PM ESTSpecial Weather StatementCTP55 min
Jan 16, 10:35 PM ESTSpecial Weather StatementCTP55 min
Jan 17, 3:01 PM ESTWinter Weather AdvisoryCTP30 hr
Jan 18, 11:53 AM ESTSpecial Weather StatementCTP82 min
Feb 5, 3:41 AM ESTWinter Weather AdvisoryCTP30 hr
Feb 26, 3:40 AM ESTWind AdvisoryCTP40 hr
Feb 26, 2:49 PM ESTMesoscale DiscussionSPC116 min
Feb 27, 4:36 PM ESTSpecial Weather StatementCTP54 min
Feb 27, 5:29 PM ESTSpecial Weather StatementCTP2 hr
Feb 27, 10:07 PM ESTSpecial Weather StatementCTP68 min
Feb 27, 11:26 PM ESTSpecial Weather StatementCTP2 hr
Feb 29, 11:08 AM ESTSpecial Weather StatementCTP67 min
Mar 3, 4:27 PM ESTMesoscale DiscussionSPC2 hr
Mar 3, 6:47 PM ESTSpecial Weather StatementCTP43 min
Mar 3, 9:42 PM ESTSpecial Weather StatementCTP33 min
Mar 3, 10:14 PM ESTSpecial Weather StatementCTP46 min
Mar 20, 3:49 PM EDTSpecial Weather StatementCTP41 min
Mar 23, 1:33 PM EDTSpecial Weather StatementCTP72 min
Mar 23, 2:50 PM EDTSpecial Weather StatementCTP85 min
Mar 28, 9:36 AM EDTSpecial Weather StatementCTP24 min
Mar 30, 12:39 AM EDTDense Fog AdvisoryCTP7 hr
Apr 7, 10:54 PM EDTMesoscale DiscussionSPC2 hr
Apr 9, 9:57 AM EDTSpecial Weather StatementCTP48 min
Apr 9, 11:09 AM EDTSpecial Weather StatementCTP36 min
Apr 12, 12:43 PM EDTWind AdvisoryCTP31 hr
Apr 13, 10:34 AM EDTMesoscale DiscussionSPC86 min
Apr 13, 11:33 AM EDTTornado WatchSPC5 hr
Apr 13, 1:20 PM EDTMesoscale DiscussionSPC85 min
Apr 13, 1:25 PM EDTSevere Thunderstorm WarningCTP50 min
Apr 13, 2:04 PM EDTSevere Thunderstorm WarningCTP41 min
Apr 21, 4:18 AM EDTFreeze WarningCTP29 hr
Apr 29, 3:33 AM EDTFlood WatchCTP50 hr
Apr 30, 10:59 AM EDTAreal Flood AdvisoryCTP6 hr
May 7, 1:44 PM EDTFreeze WarningCTP44 hr
May 9, 5:04 AM EDTFreeze WarningCTP27 hr
May 11, 2:58 AM EDTFrost AdvisoryCTP27 hr
May 12, 2:25 PM EDTFrost AdvisoryCTP18 hr
May 28, 9:02 PM EDTAreal Flood AdvisoryCTP3 hr
May 29, 7:32 PM EDTSpecial Weather StatementCTP28 min
May 29, 8:01 PM EDTMesoscale DiscussionSPC119 min
Jun 3, 8:32 AM EDTMesoscale DiscussionSPC118 min
Jun 3, 10:08 AM EDTSevere Thunderstorm WatchSPC4 hr
Jun 3, 10:17 AM EDTSpecial Weather StatementCTP43 min
Jun 3, 10:36 AM EDTSevere Thunderstorm WarningCTP54 min
Jun 3, 3:10 PM EDTMesoscale DiscussionSPC2 hr
Jun 3, 3:52 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 3, 4:49 PM EDTSevere Thunderstorm WarningCTP41 min
Jun 3, 6:21 PM EDTSpecial Weather StatementCTP54 min
Jun 4, 2:29 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 4, 4:06 PM EDTSpecial Weather StatementCTP24 min
Jun 4, 4:41 PM EDTMesoscale DiscussionSPC94 min
Jun 4, 6:25 PM EDTSpecial Weather StatementCTP65 min
Jun 4, 6:44 PM EDTMesoscale DiscussionSPC91 min
Jun 4, 6:55 PM EDTSevere Thunderstorm WarningCTP50 min
Jun 4, 8:08 PM EDTSpecial Weather StatementCTP37 min
Jun 10, 1:39 PM EDTMesoscale DiscussionSPC2 hr
Jun 10, 4:01 PM EDTSpecial Weather StatementCTP29 min
Jun 22, 1:58 PM EDTMesoscale DiscussionSPC3 hr
Jun 22, 4:36 PM EDTSevere Thunderstorm WarningCTP54 min
Jun 22, 5:02 PM EDTSevere Thunderstorm WarningCTP43 min
Jul 19, 6:46 PM EDTSpecial Weather StatementCTP44 min
Jul 19, 7:20 PM EDTSevere Thunderstorm WarningCTP27 min
Jul 22, 10:48 AM EDTMesoscale DiscussionSPC117 min
Jul 22, 12:01 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 24, 6:16 PM EDTSpecial Weather StatementCTP44 min
Jul 25, 12:24 AM EDTAreal Flood AdvisoryCTP2 hr
Aug 7, 10:06 AM EDTFlash Flood WatchCTP9 hr
Aug 7, 11:04 AM EDTAreal Flood AdvisoryCTP2 hr
Aug 7, 11:22 AM EDTSpecial Weather StatementCTP53 min
Aug 7, 11:37 AM EDTSevere Thunderstorm WarningCTP53 min
Aug 23, 6:00 PM EDTAreal Flood AdvisoryCTP2 hr
Aug 24, 12:44 PM EDTMesoscale DiscussionSPC2 hr
Aug 24, 10:46 PM EDTSpecial Weather StatementCTP29 min
Aug 25, 1:21 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 27, 4:34 PM EDTMesoscale DiscussionSPC86 min
Aug 27, 5:32 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 27, 6:35 PM EDTMesoscale DiscussionSPC115 min
Aug 27, 6:40 PM EDTSpecial Weather StatementCTP35 min
Aug 27, 6:59 PM EDTSpecial Weather StatementCTP31 min
Aug 28, 9:55 AM EDTMesoscale DiscussionSPC3 hr
Aug 28, 1:09 PM EDTSevere Thunderstorm WarningCTP51 min
Aug 28, 1:15 PM EDTTornado WarningCTP30 min
Aug 28, 1:35 PM EDTSevere Thunderstorm WarningCTP55 min
Aug 28, 1:37 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 29, 4:50 PM EDTSpecial Weather StatementCTP55 min
Sep 19, 12:53 PM EDTFrost AdvisoryCTP20 hr
Sep 20, 11:59 AM EDTFrost AdvisoryCTP21 hr
Sep 21, 1:35 PM EDTFrost AdvisoryCTP19 hr
Oct 16, 2:44 PM EDTFrost AdvisoryCTP17 hr
Oct 21, 4:01 AM EDTDense Fog AdvisoryCTP5 hr
Nov 1, 9:59 PM ESTWind AdvisoryCTP14 hr
Nov 14, 2:11 PM ESTWind AdvisoryCTP32 hr
Dec 14, 4:44 AM ESTWinter Storm WatchCTP34 hr
Dec 15, 4:30 AM ESTWinter Storm WarningCTP51 hr
Dec 16, 1:57 PM ESTMesoscale DiscussionSPC5 hr
Dec 16, 5:42 PM ESTSpecial Weather StatementCTP33 min
Dec 22, 3:09 PM ESTFlood WatchCTP69 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 archive20192021

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.