A blanket and a helmet to offer some protection. Often there isn't much time to gather things.
It is recommended to seek shelter in the basement during a tornado. If you are specifically referring to taking cover in the basement during a tornado, it can be simply called a tornado shelter.
The preferred course of action, in the case of a tornado, is to get into your basement or storm cellar. You are much safer underground.
The Basement
Yes. A concrete basement is one of the safest places to be during a tornado.
You cannot "defeat" a tornado of any kind. All you can do is take cover to ensure your safety. The best place to be is in a basement or cellar.
The safest place to be during a tornado is in a basement or cellar.
There may be a tornado tonight so we should take shelter in our basement.
If there is a tornado you should take your family and pets into the basement (if you have one) or a room with no windows, preferably on the first floor, not a second or third level of a home.
The best place to take cover in a tornado is a basement tor cellar. If you do not have one get to an interior room or hallway on the lowest floor of you house, preferably a bathroom.
in the basement
Take cover immediately in your basement or in an interior room or closet on the lowest floor.
The safest place to be if there is a tornado is in a basement or storm cellar. If you can't get to a basement get to a room in the center part of the building away from windows.