Unplug appliances not necessary to obtain weather information. Avoid using telephones or any electrical appliance. Use phones ONLY in an emergency. Do not take a bath or shower. Turn off air conditioner.
Power surges from lightning can overload the compressors.
Get to higher ground if flash floods are possible. Once flooding begins, abandon cars and climb to higher ground. Do not attempt to drive to safety. Note Most flash flood deaths occur in automobiles. Make sure the place you pick is not subject to flooding.