It could be a scene from a disaster movie, as a family on a motorcycle flees from the oncoming deluge. It’s a phenomenon known as a tidal bore, where a wave travels up a river or other narrow waterway and explodes over the banks. This occurs every autumn at the Qiantang River in Hanzhou, China:
Tidal bores in this area can reach up to 30 feet in height and move as fast as 25 miles per hour. In the scene above, captured by photographer Xu Kangping, surprised onlookers rush to escape the downpour of muddy river water.
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