👉 Grad fumes, also known as gradient clouds or atmospheric gradients, are layers of air formed when a temperature inversion occurs, typically over bodies of water or large land masses. In these conditions, warm air near the surface heats the ground and rises, while cooler air from above remains stable and doesn't mix with the rising warm air. This creates a sharp boundary where temperature changes rapidly with height, often leading to the formation of fog or low-level clouds. These fumes can extend several kilometers into the atmosphere, affecting visibility and sometimes causing localized weather phenomena like temperature inversions and reduced air quality.