And too many Americans are being injured and killed fiddling with their windows when they should be in the basement. Most structures have enough venting to allow for sudden pressure drops. Opening the wrong window can increase the damage. Trying to outrun a tornado in your vehicle is one of the dumbest things you could possibly do. You are much safer riding out the storm at home, or at the office.
Cars offer no protection whatsoever.
They are most likely to occur during late summer, when upper-level steering winds are light. Do not attempt to cross a flowing stream where the water is about to your knees. Do not drive over a flooded road. You can be stranded or trapped by rapidly rising floodwaters. The depth of water is not obvious.