The end of the month period is quickly approaching, and it will feature the most significant pattern change we have seen since the spring and an MJO helping to aide in the change, as it continue to progress through phases 5-7.
The -NAO/pseudo West Coast rex block pattern/+PNA that has been in place for this middle 1/3rd of October will be breaking down, being replaced by significant and deep Western/Central US troughing for a good portion of the final 1/3rd of October, with increasing GOA/Aleutian troughing (+EPO/WPO) as well. This will all lead to the increasingly advertised bout of Indian Summer conditions, from late this week through very early next week. In addition to the period of mild temps, there could very well be some level of severe weather threat with the significant ejecting through the Central US on Sun/Mon (Pending instability/moisture return issues in the wake of the current trough). Beyond this things will be in flux a bit, with a secondary trough sliding into the west and then likely ejecting east through the Canadian Prairies and the Central US...But small differences could determine whether there's a second bout of Indian Summer conditions or more seasonal fall like conditions, with another associated storm system as well.