The Fujita-Pearson Scale is used to measure the intensity of a Tornado based on the amount of destruction the winds may cause dependant on their speed. Also known as the F Scale, the scale goes from F0 (weak winds, minimal damage) to F5 (violent winds, major damage).
Dew Point (or DewPoint Temperature) measures the amount of moisture in the atmosphere, typically represented as a temperature. The higher the dew point, the more moisture in the air. When dew point and temperature at equal, the atmosphere is saturated.