Define the conditions under which cyclones would die out soon after they form
What will be the ideal response?
ANSWER: If the upper-level low is directly above the surface low, only at the surface (because of friction) do the winds blow inward toward the low’s center. As these winds converge (flow together), the air piles up. This piling up of air, called convergence, causes air density to increase directly above the surface low. This increase in mass causes surface pressures to rise; gradually, the low fills and the surface low dissipates. The same reasoning can be applied to surface anticyclones. Winds blow outward, away from the center of a surface high. If a closed high or ridge lies directly over the surface anticyclone, divergence (the spreading out of air) at the surface will remove air from the column directly above the high. The decrease in mass causes the surface pressure to fall and the surface high-pressure area to weaken. Consequently, it appears that, if upper-level pressure systems were always located directly above those at the surface, cyclones and anticyclones would die out soon after they form (if they could form at all).?
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