Very light flow remains overs the Central Sierra this evening with a very weak low pressure circulation located over West Central CA at 700MB. There were plenty of high clouds today. However, little in the way of air mass modification. Looking at the Tuesday 18Z  GFS 0.5 Degree Model Output, , there appears to be a slow increase in the 250 MB upper divergence over Mono County through the weekend. At the same time, the convective available potential energy “CAPE” increases, especially over the weekend.  Air mass modification should take place Friday and Saturday with areal coverage of thunderstorms on the increase, especially Saturday and Sunday… Through the process, temperatures will rise a few more degrees this week….into the upper 70s. Lows in the 40s.