Winds of 200-300 mph can occur with the most powerful tornadoes. Wrap yourself in overcoats or blankets to protect yourself from flying debris. Stay away from glass enclosed places or areas with wide-span roofs such as auditoriums and warehouses. Crouch down and cover your head. Stay away from exterior walls or glassy areas.
Most deaths occur in cars and mobile homes.
If you are in either of those locations, leave them and go to a substantial structure or designated tornado shelter. Avoid small rivers or streams, low spots, canyons, dry riverbeds, etc. Do not try to walk through flowing water that is more than ankle deep. Do not allow children to play around streams, drainage ditches or viaducts, storm drains, or other flooded areas. Even shallow water should be avoided.