It's happened to all of us. A beautiful sunny day that turn into a torrential down pour or a nice warm one that turns into a snow storm and you're wondering how you could have left you winter coat at home.

Why is it the weatherman so far off some days? How is this possible?  Come on man, it's your gig, you look at this stuff every day? Can it be this hard?

According to BYU University,mistakes are made because the models they use can't accurately track highly influential elements called internal waves for predicting weather.   Internal waves are waves that propagate between layers of low-density and high-density air.

Seems their gig might not be as easy as we thought.