Discussion
Consider the following statements about dry microbursts.
1. They form where precipitation evaporates in a deep dry layer.
2. Little or no rain reaches the ground beneath them.
3. They require heavy surface rainfall to develop.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 describe the dry microburst: precipitation falls into a deep, dry sub-cloud layer, evaporates, and the evaporative cooling makes the air negatively buoyant so that it accelerates downward and spreads violently at the surface. Statement 3 inverts the requirement - the rain must *not* reach the ground, since it is the evaporation that drives the downdraught. Virga beneath a high cloud base is the visible signature.
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