Is tornado severe weather patterns is caused by a long period of dry weather?

Severe weather is any dangerous meteorological phenomenon with the potential to cause damage, serious social disruption, or loss of human life.[1][2][3] Types of severe weather phenomena vary, depending on the latitude, altitude, topography, and atmospheric conditions. High winds, hail, excessive precipitation, and wildfires are forms and effects of severe weather, as are thunderstorms, downbursts, tornadoes, waterspouts, tropical cyclones, and extratropical cyclones. Regional and seasonal severe weather phenomena include blizzards (snowstorms), ice storms, and duststorms.