Why is the ice so thin in such hot weather?

Only in summer will a strong updraft form, which is an indispensable meteorological condition for hail. Hail, as a kind of solid precipitation, is formed in strong convective weather. This kind of strong convective weather generally occurs in places with high temperature in the early stage. When cold air passes by in the later stage, cold air sinks and hot air rises, causing convection. In the process of convection, the volume and weight of hail "embryos" such as ice cores in the air have been increasing during many ups and downs. When the updraft can't support it any longer, it falls straight and falls to the ground. The high temperature in summer is easy to form strong convective weather, so hail usually appears in summer. The hail in our city was formed when a cold air vortex from the northeast passed through the local area. A few days ago, the temperature in our city has been very high, and strong cold air suddenly met at high altitude, forming a strong convective weather state, which caused the hail process. However, as a special weather phenomenon, severe convective weather is only a necessary condition for the formation of hail, but not a sufficient condition. Other "harsh" conditions, such as strong updraft of at least 15 m/s, are needed to support hail with a diameter of 1 cm; The water content of airflow should be greater than 10g/m3, so as to ensure that the diameter of hail embryo can be increased to above 1cm within 10min. Sufficient low temperature and suitable temperature configuration ensure the rapid growth of hail quality when it moves up and down. The formation of these situations is also related to the local topography. Generally speaking, hail is easy to form in mountainous areas.