From the FedEx service delay web site:
"The wildfires are causing hazardous conditions in California, Oregon, and Washington. Our top priority is the safety and well-being of our team members, as well as providing the highest level of service to our customers. Although contingency plans are in place, some service delays and disruptions can be anticipated for inbound and outbound shipments in the areas of California, Oregon, and Washington. FedEx is committed to providing service to the best of our ability in areas that can be safely accessed."
and
"Remnants of Sally continues to cause hazardous conditions across portions of AL, FL, GA, LA, and MS. Our top priority is the safety and well-being of our team members, as well as providing the highest level of service to our customers. Although contingency plans are in place, some service delays and disruptions can be anticipated for inbound and outbound shipments across portions of AL, FL, GA, LA, and MS. FedEx is committed to providing service to the best of our ability in areas that can be safely accessed."
I'm sure it's the same with the others.