Stock image by yevgeniysh/Getty Images A family didn’t quite know what was coming when they spotted what appeared to be a tsunami wave in the sky moving ominously toward them. AccuWeather shared the video on social media, calling it a “dramatic shelf cloud formation.” NOAA says a shelf cloud is often associated with squall lines, which may contain severe winds and brief “spin-up” tornadoes. Shelf clouds appear low in the sky and shaped like a w…
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