149. You are operating on the Red River Waterway and two different air masses of differing characteristics are converging at your location. What weather phenomenon is in your vicinity?

A front is defined as the boundary between air masses with differing characteristics. The question describes this scenario, making 'A front' the correct answer. Convergence zones describe air flow, while thunderstorms and low-pressure areas are associated phenomena but not defining features of differing air masses meeting.