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WEATHER UPDATE: We had some reports into our Severe Weather Center of "frost quakes" this week. A frost quake -- or a cryoseism -- is when frozen soil saturated with water or ice cracks. WATCH below as Vicki Graf explains more about what happens. The North Carolina mountains may see more cold weather overnight. Tune in to Eyewitness News to see the forecast for your area. http://www.wsoctv.com/s/weather/ | WSOC-TV

WEATHER UPDATE: Meteorologist Vicki Graf breaks down the frigid weather we can expect this weekend. She forecasts that the wind will get up to 40 mph in Charlotte and up to 70 mph in the mountains. Sarah Rosario reports that Channel 9 has crews in the mountains tracking the wintry conditions. For weather forecasts whenever you want them, download Severe Weather Center 9's weather app. http://on.wsoctv.com/1ErtUzv | WSOC-TV