16 :1 The Pharisees also with the Sadducees came, and tempting desired him that he would shew them a sign from heaven.
2 He answered and said unto them, When it is evening, ye say, It will be fair weather: for the sky is red.
3 And in the morning, It will be foul weather to day: for the sky is red and lowering. O ye hypocrites, ye can discern the face of the sky; but can ye not discern the signs of the times?
4 A wicked and adulterous generation seeketh after a sign; and there shall no sign be given unto it, but the sign of the prophet Jonas. And he left them, and departed.
11 And the Pharisees came forth, and began to question with him, seeking of him a sign from heaven, tempting him.
12 And he sighed deeply in his spirit, and saith, Why doth this generation seek after a sign? verily I say unto you, There shall no sign be given unto this generation.
So we can see that the signs believers will be given isnt the sign as to say "words in the sky" but rather prophecies coming to life in the world for instance the Gospel of Luke 12:5353 The father shall be divided against the son, and the son against the father; the mother against the daughter, and the daughter against the mother; the mother in law against her daughter in law, and the daughter in law against her mother in law. We can see this "sign" coming to life seeing all the dysfunctional families that exist today, this is a sign that the word is true not signs written in the sky or given to us in dreams.
So basically never ask the Lord for signs.