Dense Fog Advisory

A dense fog advisory is issued by your local national weather service office when widespread dense fog develops. Latest global fog forecast and detection system. Updates every 5 minutes showing where and when fog is expected

While fog is distinctly different from severe weather events like thunderstorms, its monitoring is vital due to the potential risks it poses. Poor visibility due to fog can lead to hazardous driving and flying. What is a dense fog advisory?

A dense fog advisory is issued by weather authorities when widespread fog is expected to reduce visibility to a quarter-mile or less over a significant area. A dense fog advisory is an alert issued when fog will limit visibility to a quarter mile or less for two or more hours. Sep 10, 2025low-visibility events such as dense fog can reduce sightlines to near zero and have been linked to multi-vehicle crashes.

The nws publishes dense fog advisories to warn of significantly. Feb 26, 2025a dense fog advisory is issued by your local nws office when widespread dense fog develops. A dense fog advisory is issued when widespread fog is expected to reduce visibilities to 1/4 mile or less over a large area for an extended period of time (2 or more hours).

Nov 27, 2024thick fog warnings are in place across 10 u.s.