Telephone lines and metal pipes conduct electricity. Unplug appliances not necessary for obtaining weather information. Avoid using the telephone or electrical appliances. Do not take a bath or shower. Turn off air conditioners.
Power surges from lightning can overload the compressors.
Get to higher ground if flash flooding is possible. Once flooding begins, abandon cars and climb to higher ground. Do not attempt to drive to safety. Most flash flood deaths occur in automobiles. Make sure the place you pick is not subject to flooding.