big snows fell on Beijing语法对吗

1. 大雨大雪都是用 heavy
2. snow 不可数，所以不能加S

可以改为
It snowed heavily in Beijing
Heavy snow covered Beijing.

我的建议是改成：
Heavy snow hits Beijing.
(hit更形象一些）

big 换成 heavy

there was a heavy snow in bj

heavy snow blanketed beijing
heavy snow hit beijing

对的