Alert archive / Ohio / Dense Fog Advisories

Dense Fog Advisories in Ohio, 2025

44 dense fog advisories in 2025. 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 in 2025. Tap one for its archive.

Dense Fog Advisories: 44
Busiest month: September13 dense fog advisories
Busiest day: September 26, 20254 dense fog advisories

Over time

By month

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.

Issued	Product	Office	Counties	Lasted
Jan 31, 2:20 AM EST	Dense Fog Advisory	IWX	Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more	8 hr
Jan 31, 3:09 AM EST	Dense Fog Advisory	ILN	Butler, Darke, Mercer, Preble	5 hr
Feb 2, 8:14 PM EST	Dense Fog Advisory	IWX	Defiance, Fulton, Henry, Paulding, Williams	10 hr
Feb 6, 4:33 AM EST	Dense Fog Advisory	IWX	Allen, Paulding, Putnam, Van Wert	4 hr
Feb 12, 1:46 PM EST	Dense Fog Advisory	ILN	Auglaize, Brown, Butler, Champaign, Clark, Clermont and 17 more	10 hr
Feb 12, 1:50 PM EST	Dense Fog Advisory	CLE	Crawford, Knox, Marion, Morrow, Richland, Wyandot	10 hr
Feb 26, 11:39 PM EST	Dense Fog Advisory	IWX	Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more	6 hr
Feb 26, 11:42 PM EST	Dense Fog Advisory	CLE	Crawford, Erie, Hancock, Huron, Lucas, Ottawa and 4 more	6 hr
Mar 26, 7:12 AM EDT	Dense Fog Advisory	ILN	Adams, Brown, Butler, Clermont, Clinton, Hamilton and 4 more	4 hr
May 5, 12:09 AM EDT	Dense Fog Advisory	CLE	Ashland, Crawford, Cuyahoga, Erie, Geauga, Holmes and 15 more	10 hr
May 5, 2:09 AM EDT	Dense Fog Advisory	ILN	Delaware, Fairfield, Franklin, Hocking, Licking, Pickaway and 3 more	6 hr
May 5, 4:22 AM EDT	Dense Fog Advisory	PBZ	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more	5 hr
May 29, 3:54 AM EDT	Dense Fog Advisory	RLX	Athens, Gallia, Jackson, Lawrence, Meigs, Morgan and 3 more	6 hr
May 29, 4:08 AM EDT	Dense Fog Advisory	PBZ	Belmont, Carroll, Coshocton, Guernsey, Harrison, Jefferson and 4 more	5 hr
Jun 7, 3:25 AM EDT	Dense Fog Advisory	IWX	Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more	6 hr
Jun 29, 3:55 AM EDT	Dense Fog Advisory	CLE	Ashland, Holmes, Knox, Mahoning, Morrow, Richland and 2 more	5 hr
Jul 2, 5:25 AM EDT	Dense Fog Advisory	PBZ	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 3 more	4 hr
Jul 19, 7:26 AM EDT	Dense Fog Advisory	ILN	Butler, Champaign, Clark, Clinton, Darke, Delaware and 9 more	3 hr
Sep 7, 3:04 AM EDT	Dense Fog Advisory	RLX	Gallia, Jackson, Lawrence, Vinton	6 hr
Sep 7, 3:06 AM EDT	Dense Fog Advisory	ILN	Adams, Hocking, Pike, Ross, Scioto	6 hr
Sep 17, 3:28 AM EDT	Dense Fog Advisory	IWX	Allen, Defiance, Henry, Paulding, Putnam, Van Wert	7 hr
Sep 17, 3:39 AM EDT	Dense Fog Advisory	CLE	Erie, Hancock, Sandusky, Seneca, Wood	5 hr
Sep 22, 11:40 PM EDT	Dense Fog Advisory	IWX	Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more	10 hr
Sep 22, 11:43 PM EDT	Dense Fog Advisory	ILN	Auglaize, Butler, Champaign, Darke, Hamilton, Hardin and 6 more	10 hr
Sep 22, 11:44 PM EDT	Dense Fog Advisory	CLE	Crawford, Hancock, Lucas, Marion, Ottawa, Sandusky and 3 more	8 hr
Sep 25, 11:40 PM EDT	Dense Fog Advisory	ILN	Adams, Auglaize, Brown, Butler, Champaign, Clark and 26 more	10 hr
Sep 26, 1:44 AM EDT	Dense Fog Advisory	PBZ	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more	8 hr
Sep 26, 1:51 AM EDT	Dense Fog Advisory	IWX	Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more	8 hr
Sep 26, 3:18 AM EDT	Dense Fog Advisory	CLE	Ashtabula, Geauga, Hancock, Holmes, Knox, Mahoning and 4 more	7 hr
Sep 28, 4:01 AM EDT	Dense Fog Advisory	PBZ	Belmont, Jefferson, Monroe	20 min
Sep 28, 4:21 AM EDT	Dense Fog Advisory	PBZ	Belmont, Jefferson, Monroe	5 hr
Oct 13, 5:06 AM EDT	Dense Fog Advisory	IWX	Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more	6 hr
Nov 3, 12:52 AM EST	Dense Fog Advisory	ILN	Adams, Brown, Clermont, Highland, Pike, Ross and 1 more	8 hr
Nov 7, 10:36 PM EST	Dense Fog Advisory	ILN	Adams, Brown, Clermont, Clinton, Delaware, Fairfield and 13 more	11 hr
Nov 8, 1:22 AM EST	Dense Fog Advisory	RLX	Athens, Gallia, Jackson, Lawrence, Meigs, Morgan and 3 more	9 hr
Nov 8, 5:47 AM EST	Dense Fog Advisory	PBZ	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more	4 hr
Nov 19, 11:55 PM EST	Dense Fog Advisory	PBZ	Belmont, Guernsey, Harrison, Jefferson, Monroe, Muskingum and 1 more	10 hr
Nov 21, 12:42 AM EST	Dense Fog Advisory	ILN	Butler, Champaign, Clark, Darke, Greene, Logan and 5 more	9 hr
Nov 23, 8:08 PM EST	Dense Fog Advisory	ILN	Adams, Scioto	14 hr
Nov 24, 3:46 AM EST	Dense Fog Advisory	RLX	Gallia, Lawrence	6 hr
Dec 24, 2:01 AM EST	Dense Fog Advisory	ILN	Auglaize, Butler, Champaign, Clark, Clermont, Darke and 9 more	7 hr
Dec 25, 4:30 AM EST	Dense Fog Advisory	ILN	Auglaize, Butler, Champaign, Clark, Clinton, Darke and 12 more	5 hr
Dec 26, 7:33 AM EST	Dense Fog Advisory	ILN	Butler, Champaign, Clark, Clinton, Darke, Delaware and 12 more	5 hr
Dec 27, 11:49 PM EST	Dense Fog Advisory	IWX	Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more	5 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

47 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2024 2026

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.