Entering within 'a sand wall,' the amount of sand flying around increases suddenly, and (when it is daytime), the surrounding area becomes darker while becoming more yellowish and reddish and the wind becomes stronger as well.
「砂の壁」の中に入ると、急激に周りを飛ぶ砂の量が増え、（昼間であれば）次第に周囲が黄み・赤みを増しながら暗くなり、風も強まってくる。