Hail events represent an important natural disaster associated with great economic losses especially in agriculture. Anti-hail rockets program is based on dispersing pyrotechnical mixtures of silver-iodide (clouds seeding). The mixture act as condensation nuclei, creating a large number of small hail particles which melt and fall in form of drops. Nevertheless, it is extremely difficult to validate the effect of the seeding, due to superposition of strong natural atmospheric variations.
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