It's not necessarily just the rapid cooling... but the rapid uneven cooling. As you cool a metal rapidly from the outside, the expansion / contraction can occur quicker then the induction of heat, causing internal stress. Enough stress from the metal expanding on one side and not on the other and the metal will bend / crack. If the snow is cold enough and the receiver is hot enough, it will probably do a number on your receiver.
-davey
-davey
