Alert archive / Maryland / Dense Fog Advisories
Dense Fog Advisories in Maryland, 2021
19 dense fog advisories in 2021. 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 2021. Tap one for its archive.
- Dense Fog Advisories
- 19
- Busiest month
- October10 dense fog advisories
- Busiest day
- October 3, 20212 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 3, 11:49 PM EST | Dense Fog Advisory | LWX | Frederick, Washington | 6 hr |
| Jan 15, 10:46 PM EST | Dense Fog Advisory | LWX | Allegany | 9 hr |
| Jan 26, 8:18 PM EST | Dense Fog Advisory | LWX | Carroll, Frederick, Howard, Montgomery, Washington | 13 hr |
| Feb 28, 9:09 PM EST | Dense Fog Advisory | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 8 hr |
| Mar 24, 7:09 PM EDT | Dense Fog Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 14 hr |
| Mar 24, 9:09 PM EDT | Dense Fog Advisory | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 14 hr |
| May 17, 2:51 AM EDT | Dense Fog Advisory | LWX | Allegany, Frederick, Washington | 7 hr |
| Oct 3, 3:33 AM EDT | Dense Fog Advisory | PHI | Kent | 6 hr |
| Oct 3, 5:00 AM EDT | Dense Fog Advisory | LWX | Baltimore, Cecil, Harford, City of Baltimore | 6 hr |
| Oct 5, 12:37 AM EDT | Dense Fog Advisory | LWX | Allegany, Baltimore, Carroll, Frederick, Montgomery, Washington | 9 hr |
| Oct 6, 1:45 AM EDT | Dense Fog Advisory | LWX | Allegany | 9 hr |
| Oct 7, 12:33 AM EDT | Dense Fog Advisory | LWX | Allegany | 8 hr |
| Oct 8, 2:27 AM EDT | Dense Fog Advisory | LWX | Allegany | 7 hr |
| Oct 8, 9:01 AM EDT | Dense Fog Advisory | LWX | Allegany | 119 min |
| Oct 13, 3:53 AM EDT | Dense Fog Advisory | LWX | Frederick, Montgomery, Washington | 7 hr |
| Oct 14, 2:36 AM EDT | Dense Fog Advisory | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 7 hr |
| Oct 14, 3:16 AM EDT | Dense Fog Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 3 hr |
| Dec 30, 10:18 PM EST | Dense Fog Advisory | LWX | Allegany, Anne Arundel, Baltimore, Carroll, Cecil, Frederick and 4 more | 14 hr |
| Dec 30, 11:51 PM EST | Dense Fog Advisory | AKQ | Dorchester, Somerset, Wicomico, Worcester | 12 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Allegany County11
- Frederick County9
- Washington County9
- Carroll County6
- Montgomery County6
- Baltimore County6
- Howard County5
- Cecil County5
- Harford County5
- City of Baltimore5
- Anne Arundel County4
- Calvert County3
- Charles County3
- Prince George's County3
- Saint Mary's County3
- Kent County3
- Caroline County2
- Queen Anne's County2
- Talbot County2
- Dorchester County1
- Somerset County1
- Wicomico County1
- Worcester County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.