On weather maps, triangles typically indicate which feature?

• A. High pressure
• B. Low pressure
• C. Warm fronts
• D. Cold fronts

Answer: (D)

Triangles on weather maps indicate a cold front—the boundary where cooler air is advancing into warmer air. On maps this front is drawn as a blue line with triangles pointing in the direction the front is moving. That symbol helps you quickly grasp where cooler air is sweeping in and what kind of weather to expect along that line, such as a temperature drop, gusty winds, and often rain or thunderstorms as the front passes. By contrast, warm fronts are shown with red lines and semicircles, while high and low pressure are marked with H and L, respectively.