The Diagnosis of Conditional Symmetric Instability of the ″95.1″ Snowstorm Process

With the criteria of linear and nonlinear symmetric instability theory,the mechanism of the heavy snowstorm of January 17—18 1995(″95.1″)occurred in the northeast region of the Qinghai-Xizang Plateau was diagnosed by using the output data of a MM5 mesoscale numerical model with which the developing structure and the evolution of the ″95.1″ snowstorn were fairly well simulated.The results suggested that the positive σ² is corresponding to the development and movement of the snowstorm and the limited comparison lends some support to the hypothesis that non linear CSI can be a dominant formative mechanism of the ″95.1″ snowstorm,though more sophisticated studies are required.

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