Colorado’s Western Slope is headed into another weekend of weak thunderstorms and warmer-than-normal temperatures as monsoonal moisture continues to flow in from the south. In the days leading up to Friday, however, the mountains can expect a short-lived break from a rainy September. The Western Slope is forecast to see sunny and warm conditions on Wednesday, Sept. 9, and Thursday, with highs in the 80s for lower-elevation towns like Glenwood Sp…