Which symbol represents a warm front in weather maps?

The symbol that represents a warm front on weather maps is a series of red semi-circles. A warm front occurs when warm air moves into an area occupied by cooler air. This transition from cool to warm air leads to specific weather patterns, often resulting in gradual temperature increases and the potential for overcast conditions and precipitation. The use of red semi-circles on weather maps visually indicates the movement of warm air mass, making it easy for meteorologists and the public to identify and understand weather patterns.

The other options do not correctly represent the delineation of warm fronts in meteorological contexts. Red circles, for instance, may imply different meteorological phenomena or could be used for other designations on maps unrelated to warm fronts. Blue triangles typically signify cold fronts, indicating the movement of cold air into a warmer area, which is the opposite of a warm front. Green squares are not standard symbols in weather mapping and generally do not represent any front. Thus, the use of red semi-circles is specifically important for identifying warm fronts on weather maps.