A lot of pretty fluffy things over the metro, convective, fairly low clouds. A few have grown to thunderstorm up over the foothills, but they lose strength as they come down across the metro. Essentially, as the airmass moves lower, out of the mountains, pressure increases, letting it re-absorb some of the moisture and starving the thunderstorms as they move out onto the plains. Below is a loop of front range radar from about 2:45-3:45, you can see them calm down like your coach on his second beer.