For Luke to see this much snow or even have this much cold he was just trying to not freeze. Luke wanted to be an warm Jedi. He keep having nightmares about what he seemed as the future. He keep having the same dream. He was seeing his Father and Ben fight on an lava planet. At the end of this fight. Luke saw as his father limbs cut off. Then Ben saying in an haertbroken voice " Anakin you where like an brother to me." As his father light saber was grabbed by Obie-won But the next part was something he'd never forget. He saw as Darth Vader was walking closer and closer to him. But instead of the an lightsaber being used he only felt an black glove caresses his cheek with tender loving care. He saw as the mask of Darth Vader disappeared an set of eyes look at him. The young jedi said "Father"
Now Luke was doing his daily check for Imperial probes. He was not even thinking about the task at hand. He could only think of his vision lately. He told Han, Leia, Wedge, Chewie and R2. When he told R2 the little astromec only bumped against him to say "it ok". Luke did not notice his two legged tawn tawn being knocked unconscious by some strange creature. Luke cryed out Father help me i do not care if you are Darth Vader or not please help me."
Now Darth Vader muffled his Son's cry through the force so his master would never find Luke. He was coming. He did not need his people to Find the Rebal's he knew they where. He told the Admiral " Go to Hoth now" The Sith was only an few minutes away from Hoth he needed to get to his son. For he knew Luke needed to be saved. He would have his son. Some Pryor visions dissuaded him from teaching or even training Luke in the dark side.