One of the strategies for planting seeds is to distribute them on top of the snow. This strategy provides natural stratification, and brings the seed into contact with the soil, as the snow melts. Prairie Moon provided two comparison photos to demonstrate the amount of settling that had taken place in just an hour. (Key photo shows initial sowing view – cropped to reduce the number of bytes) – and the following photo shows how much settling has taken place after just an hour.
If you sow your seeds on top of the snow just before another snowfall, the second snow will cover the seeds, and keep them invisible to creatures that might want to eat them.
Thanks to Prairie Moon for the photos.