The storm overnight picked up speed and intensity, and a decision was made that in order to return to Washington to monitor and oversee the efforts to prepare for the storm and respond to it, that we needed to leave earlier than planned.
The president has pulled out of a Monday event in Ohio - considered a key swing state - in order to return to Washington to monitor the storm - although he is still set to attend a rally with former President Bill Clinton in Florida earlier in the day.
Part of a stress test is to understand how both parts work together and to also monitor the performance and make sure you are getting at least a fair return for the risk you are taking.