The main hazards that thunderstorms produce are dangerous hail, tornadoes, and lightning. Thunderstorms are very unpredictable and can pop up at any time here in Southwest Florida. Also, remember that tornadoes can form in areas of severe development. Stay indoors unless it is absolutely necessary. Don't use the telephone.
Lightning can travel through telephone lines.
Unplug all major appliances from the wall. If there is a power outage, turn off all electrical switches and appliances before power comes back on. This will prevent damage to appliances if there is a power surge. Be alert for high winds, lightning, and possible tornadoes. Monitor your portable radio.