On summer's opening day, up to 20 inches of snow buried the high terrain of the Colorado Rockies, boosting the state's snowpack to extraordinary levels for the time of year. The solstice flakes marked a continuation of a snowy stretch that began in January and February and lingered through spring. Even before the solstice snow, The Denver Post wrote, the state's snowpack was "in virtually every numerical sense . . . off the charts." At the time, the snowpack was 751 percent above normal. Due to the new snow Friday into the weekend, the Natural Resources Conservation Service reported that...