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根据安阳市１９６３～１９９１年降雹资料，从天气图上分析研究降雹前的主要大气环流形势及其特点，并根据冰雹形成的条件寻找预报指标。
According to the data of hail reduction from 1963 to 1991 in Anyang City, the main atmospheric circulation before hailfall and its characteristics are analyzed from the weather charts, and the forecast indicators are found according to the hail formation conditions.