Consider the following statements regarding 'fronts': 1. The movement of a front causes a slow change in weather in the area over which it moves. 2. Cold fronts are associated with thunderstorms. 3. Warm front is the boundary between an advancing mass of warm air where it is overriding and rising above a mass of colder air. Which of the statements given above is/are correct?

The movement of a front causes a sudden/rapid change in weather (not slow) — including changes in temperature, pressure, wind direction, and precipitation — so Statement 1 is incorrect. Cold fronts, where cold air pushes under warm air, force the warm air rapidly upward causing strong convection and are typically associated with thunderstorms, so Statement 2 is correct. A warm front is indeed the boundary along which a warm air mass advances and overrides (rises above) a retreating mass of colder air, so Statement 3 is correct. Hence statements 2 and 3 are correct.