雪が降っています！
Yuki ga futte imasu!
Snow is falling!
Simple
大雪が降っていて、外が真っ白です。
Ōyuki ga futte ite, soto ga masshiro desu
Heavy snow is falling, outside is pure white.
真っ白 = completely white, natural
ぼたん雪がしんしんと降り積もって、世界が真綿に包まれたみたいですね。
Botan yuki ga shinshinto furitsumotte, sekai ga mawata ni tsutsumareta mitai desu ne
Peony snow quietly accumulates, it feels like the world is wrapped in cotton.
ぼたん雪 = peony snow = large soft snowflakes; しんしん = quietly/steadily; 真綿 = cotton - deeply poetic Japanese
More Japanese Weather Phrases