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Fox News correspondent Mike Tobin reports that severe weather disrupts travel plans ahead of the holidays on'Special Report.' FedEx and UPS announced mail delivery could be interrupted by the massive winter storm moving across the U.S. after key distribution hubs were blasted by the severe weather conditions. On Friday, FedEx posted a statement to its website warning those who used its Express service that the guaranteed delivery date of Dec. 26 may not be met after the Memphis and Indianapolis hubs experienced "substantial" weather disruptions. The shipping company said actions have been taken to lessen any impact on delivery, but the safety of its team members is the "number one priority." "We recognize the importance of deliveries this holiday weekend and are committed to providing service to the best of our ability by implementing contingency measures where it is safe and possible to do so," the statement read.

We all know severe weather impacts demand for quick service retail chains. Those working in the industry know it impacts for longer than simply the day or two of the event itself. But building a model to accurately identify these demand impact patterns was impossible for QSR chains given the limited frequency and distribution of severe weather event data. Here's how my team tackled it and successfully pinpointed the multi-day impact of 73 different kinds of severe weather events. You need information -- you need numbers. So my team needed to find a way to turn the costly chaos of severe weather impact into accurate impact figures as soon as a watch or warning was issued.