It's a known fact that tornadoes sound like trains...

We pulled into Pawnee State Park in Lincoln, NE around 9:30 pm and still had to "set up camp". As soon as the camper was set up, the rains came...We went to sleep and I woke up about 1:30 am to booming thunder, flashing lighting, and hurricane force winds! The canvas on the camper was sucked upward by the wind, then pushed in by the wind...the top rocked side to side and the sound of a freight train was looming in the distance...I KNEW we were about to be blown away by a tornado and woke Patrick in a panic - He kindly rolled over and said "It's fine, go to sleep!" I kept "guard" for the rest of the night until about 6 am when the winds subsided...Oh sweet daylight!