The cut-off low is rapidly giving way to a strong high pressure ridge building into the Southern California area. My earlier estimates of upper 80s will be blown completely out of the water. Air rotating around that high will funnel air from the hot Arizona desert directly into the region.
It now appears that instead of a gradual warming trend, and sharp rise in temperatures is expected into the early part of next week, and a good old fashioned heat wave is in the cards through the middle of the week. Forecast temperatures are trending towards the century mark here in Studio City, and as hot as 106 towards the warmer parts of the San Fernando Valley, such as Chatsworth and Woodland Hills.
The hot streak looks like it'll break on Thursday as onshore flow returns, and we'll return rapidly to seasonal normals.
The Miriam Wild Card is still in play as the leftovers from the former hurricane stream into the southwest United States. It will definitely make the air humid and sticky, and when you get tropical moisture and heat in the mix, there is always a chance for an isolated thunderstorm. Very low chance, say about 10%, but worth mentioning.
It'll dry out in a big way starting later in the day on Saturday, to the point that National Weather service forecasters are warning of increased fire danger. No red flag warning just yet, but we are getting into that time of year.