They knew that to create damage of the magnitude they were observing, that the wind inside the tornado would have to be a certain speed, based on wind tunnel research. But, tornadoes have occurred in every month of the year in Oklahoma. But, tornadoes can occur at any hour of the day. A killer tornado roars through Morris at about midnight. Make a mental checklist to remember to watch for cool, gusty winds, rain, and possibly hail.
Tornadoes normally move in the same general direction and speed as the parent thunderstorm.
And, mostly, that movement is from southwest to northeast or from west to east. Most tornadoes that develop in early to mid-spring are larger and tend to have higher wind speeds, move faster, and stay on the ground longer. The tornadoes that form in late May and June tend to be smaller, move slower, and have a shorter life-span. It can be only a few seconds or minutes for a small or weak tornado. First, let's start with your home.