Fog is a visible aerosol consisting of tiny water droplets or ice crystals held in the air near the Earth 's surface. [1][2] Fog can be considered a type of low-lying cloud usually resembling stratus and is …

Fog is a cloud of small water droplets near ground level. It is formed by the condensation of water vapor on tiny particles that are always present in natural air; this occurs when the air becomes saturated …

Steam fog forms when cold air moves over warm water. When the cool air mixes with the warm moist air over the water, the moist air cools until its humidity reaches 100% and fog forms.

Jan 28, 2026 · Freezing fog advisory explained as US dealt yet another extreme winter weather warning The weather event can create hazardous road conditions

Monitor fog conditions live with precise, regular updates and comprehensive forecasts to ensure safer travel and planning.

Oct 19, 2024 · Learn about fog in meteorology. Discover the definition, how and why fog forms, the different types, and how it differs from other phenomena.

Sep 30, 2025 · While ground fog is caused by cool, moist air rising from the ground, advection fog forms when warm, damp air flows over cold ground. You can distinguish between ground fog and advection …

Aug 28, 2025 · Fog is a common atmospheric phenomenon, often described as a cloud that forms at ground level. It appears as a dense, opaque layer that can significantly obscure vision.

Feb 10, 2025 · It's the latest in a widespread claim across the U.S. that the dense fog blanketed large areas of the country in the last two months, nicknamed Fogvid-24, was making people sick.

2 hours ago · Tule fog is choking California’s Central Valley. Here's how it forms and why it's forming less often despite heavy fog this season.