The cooler and denser air wedges under the less-dense warmer air, lifting it.
The air with greater density moves under the less dense warmer air, lifting it, which can cause a line of showers and thunderstorms, or a squall line to form when there is sufficient moisture.
The air with greater density moves under the less dense warmer air, lifting it, which can cause a line of showers and thunderstorms, or a squall line to form when there is sufficient moisture.
Use simpler wording: The cooler and denser air wedges under the less-dense warmer air, lifting it. Output: