Dense Fog Advisories in Pennsylvania
594 dense fog advisories since 1986. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of dense fog advisories reaches back to 2005.
Dense Fog Advisories by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Dense Fog Advisories
- 594
- Busiest year
- 202656 dense fog advisories
- Average year
- 27over 22 years on file
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lancaster County129
- Schuylkill County128
- Centre County125
- Clinton County123
- York County123
- Delaware County123
- Lebanon County121
- Lycoming County121
- Philadelphia County121
- Union County119
- Mifflin County118
- Snyder County118
- Juniata County116
- Northumberland County114
- Dauphin County113
- Perry County113
- Bucks County113
- Huntingdon County111
- Montour County111
- Cumberland County110
- Chester County110
- Montgomery County109
- Adams County107
- Clearfield County106
- Columbia County106
- Blair County103
- Franklin County100
- Bedford County98
- Berks County97
- Northampton County97
- Fulton County96
- Lehigh County96
- Cameron County94
- Elk County92
- Sullivan County92
- Potter County90
- McKean County89
- Tioga County88
- Carbon County86
- Monroe County85
27 more counties
- Erie County81
- Warren County76
- Crawford County73
- Cambria County70
- Butler County69
- Beaver County66
- Somerset County65
- Clarion County65
- Lawrence County63
- Venango County63
- Jefferson County62
- Mercer County62
- Forest County60
- Armstrong County59
- Washington County57
- Allegheny County56
- Greene County49
- Wayne County40
- Westmoreland County40
- Luzerne County36
- Pike County36
- Fayette County36
- Lackawanna County35
- Wyoming County30
- Bradford County29
- Susquehanna County29
- Indiana County22
The latest dense fog advisories
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 30, 5:14 AM EDT | Dense Fog Advisory | CTP | Cameron, Clearfield, Elk, McKean, Potter, Warren | 5 hr |
| Aug 21, 1:50 AM EDT | Dense Fog Advisory | PBZ | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 6 more | 7 hr |
| Aug 21, 1:04 AM EDT | Dense Fog Advisory | BGM | Bradford, Lackawanna, Luzerne, Susquehanna, Wayne, Wyoming | 9 hr |
| Aug 21, 12:33 AM EDT | Dense Fog Advisory | CTP | Bedford, Blair, Cambria, Cameron, Centre, Clearfield and 19 more | 9 hr |
| Aug 18, 4:52 AM EDT | Dense Fog Advisory | CTP | Elk, McKean, Warren | 4 hr |
| Aug 15, 1:55 AM EDT | Dense Fog Advisory | PBZ | Allegheny, Beaver, Fayette, Greene, Indiana, Washington and 1 more | 8 hr |
| Aug 15, 1:49 AM EDT | Dense Fog Advisory | CTP | Bedford, Blair, Cambria, Fulton, Huntingdon, Somerset | 7 hr |
| Jul 9, 4:00 AM EDT | Dense Fog Advisory | CTP | Cameron, Centre, Clearfield, Clinton, Elk, McKean and 2 more | 5 hr |
| Jul 5, 3:17 AM EDT | Dense Fog Advisory | CTP | Bedford, Blair, Cambria, Cameron, Centre, Clearfield and 12 more | 6 hr |
| Jul 5, 2:44 AM EDT | Dense Fog Advisory | PBZ | Clarion, Forest, Jefferson, Venango | 6 hr |
| Jun 21, 4:03 AM EDT | Dense Fog Advisory | PBZ | Armstrong, Butler, Clarion, Forest, Indiana, Jefferson and 1 more | 4 hr |
| Jun 21, 3:53 AM EDT | Dense Fog Advisory | CTP | Blair, Cambria, Cameron, Centre, Clearfield, Clinton and 6 more | 4 hr |
Nearby
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.