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You’ve probably seen plenty — squall lines are long lines of severe weather that most often precede cold fronts.
A squall line can approach from the horizon with a line of low-hanging, dark clouds.
Check out this video of a powerful squall line:
I'm a weather geek from Florida who's been studying meteorology and watching weather patterns for years! I enjoy sharing little-known facts and fun stuff about the weather. I especially like sharing interesting details about weather events and conditions that can affect you… and how to prepare for Mother Nature's ever-changing weather patterns.