February 21, 2019 5:00 pm Weather Quiz: EF Scale Based on What? NBC 5 Chief Meteorologist Rick Mitchell asks, the EF tornado scale is based on what? Wake Up to Something Good 3:00 NBC 5 Forecast: A slim evening storm chance, then increasing heat 0:39 Weather Quiz: Wind shear 2:28 NBC 5 Forecast: A slim evening storm chance, then increasing heat 2:25 NBC 5 Forecast: A few spotty showers or thunderstorms could develop today, some severe 2:29 NBC 5 Forecast: A few spotty showers or thunderstorms could develop today, some severe