How does sirimiri arise?

2003/03/01 Elhuyar Zientzia Iturria: Elhuyar aldizkaria

• Klima

Rain theories do not serve to explain the sirimiri and New York scientists have created one.

According to the theory accepted by experts, raindrops occur in two phases. In the nucleation phase they acquire a minimum size to be able to grow in the form of drops. When they have this size, they begin to fall through the cloud and, under the influence of strong wind currents, collide, unite and rise. They reach a minimum size of 20 minutes and reach the size of sirimiri drops in an hour.

However, in the clouds emitting the sirimiri the process occurs in a quarter of an hour, in much warmer clouds. How to demonize? Meteorologists believe that in the quieter air whirlpools the drops condense and join faster, but they do not know to what extent this effect is so great.

New York scientists have not clarified this, but have proposed another theory. According to them, the drops of sirimiri are also formed in two phases, that is, first the nucleation occurs and then one that follows the same pattern of the nucleation. After this second phase, scientists have seen the drops come together and grow very quickly. Drops of sirimiri, therefore, should at first exceed two size limits, but then grow very quickly.