In lieu of official lightning watches and warnings, you can keep your own vigilant watch on the sky. Lightning can cause power surges. Unplug all appliances, including air conditioner, before the storm hits. Listen for storm updates on a battery-powered radio. Avoid using the phone.
Telephone lines can conduct electricity.
Metal pipes also conduct electricity. Stay away from faucets, sinks and bathtubs. Close the blinds and shades of your windows, then keep away from them. Keep pets on a leash or in a carrier. Obey advisories promptly.