dense fog advisory
Definition
A type of weather alert issued by national meteorological services, such as the National Weather Service in the US, warning of fog so thick it reduces visibility to one-quarter mile or less, urging caution for drivers, pilots, and pedestrians.
An official notice for impending or existing dense fog conditions that could lead to hazardous travel, often lasting several hours into the morning.
Examples
The dense fog advisory turned my commute into a real-life game of bumper cars, where everyone guessed the lane lines.
Under the dense fog advisory, my GPS confidently directed me into what felt like Narnia, minus the talking animals.
Thanks to the dense fog advisory, I arrived at work looking like a drowned pirate who'd lost his ship in a soup bowl.
The dense fog advisory had joggers debating whether 'runner's high' included accidentally high-fiving lampposts.