Severe Storms – What to do? - Public Safety Canada

You can greatly lessen the impact of a severe storm by taking the time to prepare in advance. This involves three basic steps: find out about the risks and the type of storms in your region; make a family emergency plan, so that everyone knows what to do, and where to go in case of an emergency; get an emergency kit, so that you and your family can be self-sufficient for at least 72 hours during a severe storm. 

Your Emergency Preparedness Guide - Public Safety Canada

If an emergency happens in your community, it may take emergency workers some time to reach you. You should be prepared to take care of yourself and your family for a minimum of 72 hours.