Answer: relative humidity or dewpoint is a better variable to examine and to determine if there is sufficient moisture for thunderstorms to form. It's a TRUE statement.
Step-by-step explanation:
There are three factors that must be present for a thunderstorm to occur. They are: MOISTURE, INSTABILITY, and LIFTING.
Low level moisture is assessed by examining boundary layer dewpoints. Severe thunderstorms are more likely when the surface dewpoint is 55 F or higher, all else being equal. Low dewpoint values inhibit sufficient latent heat release and significantly reduce the tornado threat.