You could almost forget everything in the snow. The radiation, for example.
Yes, the second sentence is actually a sentence fragment. No, I don’t think it needs to be “corrected.” Standardized grammar and punctuation exist for the sake of clarity, and if the meaning isn’t lost or impeded by the use of an incomplete sentence, or if it is actually enhanced by that, keep the incomplete sentence.
On the other hand, you really do need the comma after radiation.