Massachusetts February 18, 2020 12:11 pm What Is Thundersnow? Thundersnow is a rare sight to see during a storm, but it is quite breathtaking. So how does this phenomenon happen? US & World Videos 2:53 Weather forecast: Morning rain 3:17 Temps continue to stay chilly in our region Tuesday 2:44 Weather forecast: Scattered morning rain 3:26 More April showers on the way to Boston as May arrives 3:21 Weather forecast: Partly cloudy, with calm conditions