You might say that Philadelphia is a ways off from Grantham, but in the United States, it has the highest risk of flooding that could go over 12 feet. According to the Philadelphia Office Of Emergency Management, during the disaster always carry a portable radio that consumes very low battery, go to higher ground to use the radio and check for updates, never try to swim to safety and never cross waters more than knee deep.

As much as possible, halt your vehicle during floods and abandon them in stalled areas to avoid being rushed by massive floods.