Dense Fog Advisories in Ohio
630 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
- 630
- Busiest year
- 202544 dense fog advisories
- Average year
- 29over 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.
- Williams County137
- Defiance County133
- Clark County131
- Fulton County131
- Champaign County129
- Clinton County127
- Darke County127
- Greene County127
- Henry County126
- Logan County126
- Miami County125
- Shelby County124
- Madison County123
- Montgomery County122
- Preble County122
- Warren County122
- Butler County121
- Paulding County121
- Fayette County119
- Union County119
- Delaware County116
- Hardin County114
- Auglaize County113
- Franklin County112
- Highland County112
- Putnam County111
- Mercer County110
- Licking County109
- Ross County107
- Van Wert County104
- Clermont County103
- Pickaway County103
- Brown County102
- Allen County100
- Hocking County98
- Adams County97
- Marion County97
- Pike County97
- Seneca County97
- Ashland County95
48 more counties
- Crawford County95
- Morrow County95
- Scioto County95
- Richland County94
- Wayne County94
- Fairfield County93
- Knox County93
- Wood County93
- Hamilton County92
- Hancock County92
- Sandusky County92
- Wyandot County91
- Holmes County89
- Ottawa County86
- Lucas County85
- Medina County85
- Huron County84
- Lorain County84
- Portage County82
- Stark County81
- Ashtabula County81
- Summit County79
- Trumbull County79
- Erie County76
- Mahoning County74
- Geauga County72
- Cuyahoga County67
- Jefferson County63
- Harrison County61
- Carroll County60
- Coshocton County60
- Guernsey County59
- Muskingum County59
- Tuscarawas County59
- Belmont County58
- Columbiana County56
- Lake County53
- Monroe County51
- Noble County48
- Gallia County13
- Lawrence County13
- Jackson County12
- Vinton County12
- Washington County12
- Athens County11
- Meigs County11
- Morgan County11
- Perry County11
The latest dense fog advisories
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 3:13 AM EDT | Dense Fog Advisory | ILN | Adams, Auglaize, Brown, Butler, Champaign, Clark and 26 more | 6 hr |
| Aug 21, 1:50 AM EDT | Dense Fog Advisory | PBZ | Belmont, Guernsey, Harrison, Jefferson, Monroe | 7 hr |
| Aug 15, 5:54 AM EDT | Dense Fog Advisory | CLE | Holmes, Knox, Marion, Morrow | 3 hr |
| Aug 15, 1:55 AM EDT | Dense Fog Advisory | PBZ | Belmont, Carroll, Coshocton, Guernsey, Harrison, Jefferson and 4 more | 8 hr |
| Aug 7, 5:06 AM EDT | Dense Fog Advisory | IWX | Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more | 4 hr |
| Aug 6, 5:57 AM EDT | Dense Fog Advisory | ILN | Adams, Brown, Clermont, Clinton, Fairfield, Fayette and 6 more | 3 hr |
| Jun 29, 6:00 AM EDT | Dense Fog Advisory | ILN | Adams, Brown, Highland, Hocking, Pike, Ross and 1 more | 3 hr |
| May 28, 2:56 AM EDT | Dense Fog Advisory | ILN | Adams, Brown, Butler, Clermont, Clinton, Fayette and 9 more | 6 hr |
| May 25, 6:30 AM EDT | Dense Fog Advisory | ILN | Auglaize, Hardin, Mercer | 2 hr |
| May 25, 2:15 AM EDT | Dense Fog Advisory | RLX | Athens, Jackson, Morgan, Perry, Vinton, Washington | 7 hr |
| May 25, 2:11 AM EDT | Dense Fog Advisory | PBZ | Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more | 7 hr |
| May 25, 1:30 AM EDT | Dense Fog Advisory | CLE | Ashland, Ashtabula, Crawford, Cuyahoga, Erie, Geauga and 22 more | 8 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.