The 500mb forecast for October shows a depression of height lines on the West Coast which has been outlined in blue. This depression is characteristic of a storm track pushing through the West Coast and through the Southwest. This track is traditional for what can become severe weather outbreaks in the Southern Plains. The area outlined in red is for where this pattern could produce an active weather pattern going into fall.
This pattern could be temporary, as the CFS does not predict this depression on the West Coast going into the rest of fall and early winter months. However, I find this to be an interesting development, as this would essentially break down the ridge that has been spreading record-breaking heat across much of the nation.