Jun 21, 2013 3:32 PM by CNN
CALGARY - Devastating flooding forces tens of thousands of people out of their homes in southwest Canada.
The emergency in Calgary comes a day after rain-swollen rivers burst from their banks in southern Alberta.
It's hard to believe but some of the downtown streets of Calgary, one of Canada's largest cities, had been turned into canals.
This YouTube video shows the roof from a house literally being washed away.
Roads closed, schools closed, the Calgary zoo closed as the city and about a dozen communities in southern Alberta declare a state of emergency.
The premier of Alberta says the prime minister has offered to help however he can.
She says people need to listen if asked to evacuate, but she commended everyone for coming together.
"As tragic as it is to see the streets of so many communities empty of people and full of water, and to think of the thousands of people who have been displaced, it's incredible how we come together in times like this."
Tens of thousands of people have been evacuated from their homes after days of rain have caused massive flooding.
And the mayor of Calgary warns the worst is still to come.
"The bow is certainly moving higher and faster than i have ever seen in my lifetime, and we anticipate that there is still maybe an increase in volume on the bow over the next couple of hours."
The flooding was caused by a slow-moving storm that dumped more than six inches of rain on the region from Wednesday to Thursday.
Forecasters say much as another inch of rain is possible northwest of Calgary today and yet another front is expected monday, bringing the threat of even more rain.