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Air is now more moist and condensation can form at higher levels .
This is the downdraft. Forced lift caused by a front, a mountain range, or along the leading edge of a sea breeze. That is when the air is most unstable. Explain why airmass thunderstorms tend to dissipate much sooner than severe thunderstorms. Because of their more upright posture, the precipitation prevents further updrafts to rise from the surface.