Look for darkening skies, flashes of light, or increasing wind. Listen for the sound of thunder. Go to safe shelter immediately. Keep car windows closed and avoid convertibles. Avoid using the telephone or any electrical appliances.
Power surges from lightning can overload the compressor, resulting in a costly repair job.
If windows break due to objects blown by the wind, the shades will prevent glass form shattering into your home. Make sure the place you choose is not subject to flooding. Squat low to the ground. Place your hands on your knees with your head between them. Make yourself the smallest target possible.