By using the radiosonde data and the satellite retrieval and observation,the phenomenon that the homogeneous freezing latent heat warms the air in severe storms is revealed.It was found that the temperature can increase by as much as 50 ℃ within that layer in the severe convective storm because of homogeneous freezing.It is mainly because the updrafts are so strong that the cloud drops have no enough time to grow larger and the conversion of cloud drops to hydrometeors and the glaciation of the cloud are delayed to higher heights.Heterogeneous ice nucleation does not have time to deplete much of the cloud water before reaching the homogeneous glaciation level.Thus most cloud drops are carried to the height of homogenous freezing and are instantly frozen into ice crystals,which releases the latent and warm the ambient air.The phenomenon is also verified by the NOAA satellite observation that small ice particles formed by homogenous freezing on the cloud top and overshooting top.The warm effect of homogeneous freezing could be detected by the sounding when it is close to the storm and the tropopause is close to the height of homogeneous freezing.