Also learn how to create sandbags and utilize them effectively. You could save your house. At the first indication there may be flooding, you should try to fill your car's gas tank in case an evacuation is ordered. If one is, gas stations will likely be very busy. If told to evacuate, do so as quickly as possible.
Time is of essence.
Things to Know About Flash Floods Flash floods can only take several minutes or hours to develop. If you live or are in an area you suspect to be a likely target for a flash flood and it is raining hard, be prepared to evacuate. Flash floods are typically the result of the hillside runoff of heavy rain. This situation can be enhanced if the hillsides have been stripped of trees, brush and other watershed by fires or other factors. The force of a flash flood is unlike anything you've ever seen.