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You can watch Storm Cell (2008) for free on Fawesome.

A brother and sister are torn apart when their parents die tragically in a tornado. While he moves to Seattle to be away from the memory, she devotes her life to studying storms and weather patterns. When she discovers the threat of a powerful series of tornadoes are heading for Seattle, she must convince her brother and the entire city that she is not crazy; and they are in grave danger

Can a sibling connection survive when a freak weather pattern threatens to level an entire city? This low-budget disaster flick prioritizes frantic pacing and swirling debris over cinematic polish.