Monsoonal moisture is persisting in Colorado, with showers, weak storms and flash flood risk forecast for the Western Slope through Saturday. Drier and warmer conditions are expected to return by Sunday. Most areas west of the Continental Divide are expected to receive 0.25-0.5 inches of rain from Wednesday, Sept. 16, through Friday, with more than 1 inch possible in isolated areas, according to a Wednesday report from OpenSnow. Zach Hiris, a N…