MOUNT VERNON, Wash. — Days of torrential rain in Washington state has caused historic floods that have stranded families on rooftops, washed over bridges and ripped at least two homes from their foundations, and experts warned that even more flooding expected Friday could be catastrophic.

What You Need To Know

Days of torrential rain in Washington state has caused historic floods, stranding families on rooftops and washing over bridges

Experts warn that more flooding expected Friday could be catastrophic

Washington is under a state of emergency, with evacuation orders for tens of thousands –– with floods impacting a large parts of the state, closing roads and causing landslides

In the north near the U.S.-Canada border, the cities of Sumas, Nooksack and Everson have been evacuated

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