Your questions sounds similar to a passage in the Bible:

Dreams occur throughout the Bible, and in most cases, they appear because God used them to talk to specific people about specific plans. He spoke through a dream to Abimelech about Abraham's wife. He showed Jacob a stairway to heaven. He showed Joseph how he would rescue his family in a dream. God spoke to Gideon through someone else's dream. The list goes on and on in both the Old and New Testaments.

But does God speak to us through our dreams today? We dream every night, so researchers tell us. Most of our dreams are forgotten before we wake up. Some of our dreams are because of what we saw on television or read in the newspapers. Some are because of what was on our minds throughout the day. Still others may be because of what we ate that day.

So how do we draw the line between the ramblings of our unconscious minds and the instructions of God himself? In the Bible, if a dream was not specific, God also provided an interpreter to point the dreamer to God's intentions.

If you are wondering about the tornado in your dream, ask God to reveal to you the meaning. If he does not, or if you are unsure, don't let it bother you. It was probably just a dream.