国际降水物理学会荣誉主席T·贝吉龙曾提出:下大雪或大雨的云都是双层的。黑龙江省597农场气象站站长蔡尔诚在实践中发现:“双层云”恰好是位于“降水云区”的前方,虽然其自身不降水,但却能促使其后部的降水云加强的一种“征兆云”。从而他提出了“中国暴雨云型”预报方法,引起我国气象部门的 T · Berghillon, honorary chairman of the International Society for Precipitation Physics, proposed that clouds under heavy snowfall or heavy rainfall are double-decker. Cai Ercheng, director of 597 Farm Meteorological Station in Heilongjiang Province, found in practice: “double-layer cloud” is just in front of “precipitation cloud area”, although it does not have its own precipitation, but it can promote the rear of a cloud of precipitation enhancement “Sign cloud.” Thus he put forward a “China storm cloud type” forecast method, causing meteorological department