A Tornado Warning is issued when a tornado has been sighted or indicated by weather radar. Move to your predesignated place of safety. Stay informed of weather conditions by listening to NOAA Weather Radio or tuning to local radio and television stations for the latest tornado watches and warnings. Remember tornadoes occasionally develop in areas in which a Severe Thunderstorm Watch or Warning is in effect, so listen for that information as well. Environmental Clues Dark, often greenish appearing sky Wall cloud formations Large hail Loud roar, similar to the sound of a freight train Some tornadoes appear as a visible funnel extending partially to the ground or to the ground.
Some tornadoes are clearly visible while others are obscured by rain or nearby low hanging clouds.
Tornado Safety Develop a plan for your family for what action to take if a tornado occurs while at home, work, school or engaged in outdoor activity. Have frequent reviews or drills of your plan. Know the geography of the area you live in. If necessary, keep a highway map handy to follow storm movements as reported in weather bulletins. Monitor NOAA Weather Radio or local radio and TV stations during threatening weather.