But tornadoes can occur anywhere at any time. Mainly they appear from March through June and most frequently from North Central Texas to Kansas. A tornado is defined as a violently rotating column of air extending from a thunderstorm to the ground. The most violent tornadoes are capable of tremendous destruction with wind speeds of 250 mph or more and can last more than an hour. About 69 percent of tornadoes are weak tornadoes with wind speeds of less than 110 mph and last anywhere from one to 10 minutes.
Some tornadoes appear as a visible funnel extending only partially to the ground.
Others are clearly visible while some are obscured by rain or nearby low-hanging clouds. Occasionally, tornadoes develop so rapidly that advance warning is impossible. But in most cases, tornado warnings are issued and should be followed. For more information about tornadoes or assistance in developing a family or company disaster plan, call the City of Fort Worth Emergency Management Office at 871-6170. Last week's CityPage listed the city's boards and commissions to which citizens are appointed by City Council.