How does doppler radar work?

Here is a current loop of radar as of 12:40 pm. The line of severe storms continues to track northeast through northwest Colorado and portions of central Colorado. Expect 60 to 70 mph wind gusts, torrential rain and frequent lightning along this line. Some hail is still possible as well but nothing as large as what we saw earlier today. Southwest Colorado is still seeing some strong storms with small hail and gusty winds 40 to 50 mph in addition to heavy rain. Flooding is also occuring in east-c