Like a snowfall, it will also relate to a spiritual truth. Just as that snow covered everything in sight, His grace covers our sins. But grace doesn't just cover it, it erases sin. God always makes the first move in this thing called salvation.
Although we sinned as hard as those Israelites, He is still willing to cleanse us as white as snow. Though are sins are like scarlet, they shall be as white as snow (Isa. 1:18). When He made this promise, His children had a painful problem with sin. He compared them to a physical body plagued with unhealed wounds and sores.
No matter how bad they sinned, God was willing to extend His grace to them. Today, we have the same assurance. Sin may stain our lives, but when we repent and confess it, we have the forgiveness of sins, according to the riches of God's grace (Eph. 1:7). The weight of sin is balanced only by the blood of Christ, with His unending love and amazing grace.