“Both FedEx and UPS employ teams of meteorologists….forecasting as much as 10 to 15 days in advance. Combining weather information with seasonal demand and packages in the system allows them to reroute and plan for contingencies. Large companies like Amazon also feed in their demand profiles, helping to improve the result further.” Attributed Article
“A snowstorm in Dallas might see packages rerouted to Memphis or Denver. Delivery schedules and route maps are altered for drivers when circumstances demand. All these measures are tweaks and significant adjustments designed to keep the flow smooth and precise.” Attributed Article
“If a snowstorm hits Denver, it can delay thousands of packages that travel through the city before reaching their final destinations on the other side of the country…. engineers in Portland, Oregon, could see that a number of Massachusetts-bound packages were heading for trouble, and divert some of them through the Chicago hub, sending the rest through the one in Meadowlands, New Jersey, to avoid swamping Chicago. Both of those facilities would be able to sort the packages and send them on for local distribution in time to fulfill contracts.”