The Red Cross has set up a special online form to make donations simpler.
You can also make a $5 donation by texting REDCROSS to 30333.
Others are providing help through a Facebook page, offering places for people and pets to sleep and parking for cars and recreational vehicles.
The Red Cross also called attention to a new app that was launched this week to help Canadians prepare for emergencies.
The app, called Be Ready, uses weather feeds to alert users about potential floods, forest fires and tornadoes.
The free app is compatible on iPhone, iPad, and Android devices.