螺旋度——预报强风暴的风场参数

介绍了螺旋度概念,指出螺旋度作为描述环境风场是否有利于强对流风暴生成的一个物理参数,在业务预报中具有实用价值。并用实例讨论了将其用于强对流预报时应注意的问题。

Helicity,a Parameter for Forecasting Severe Convective Storms

The concept of helicity,defined as the inner product between streamwise vorticity and storm relative winds,has been reviewed. Six cases of severe convective storms over Beijing area are presented to acquaint the forecaster with a range of expected values. The results indicate that helicity may serve as a forecast parameter for severe convective storms.