For a constant temperature, the smaller the difference, the more moisture there is, and the higher the relative humidity. In the lower troposphere, more moisture (small dew point depression) results in lower cloud bases and lifted condensation levels (LCL). LCL height is an important factor modulating severe thunderstorms.
At a constant temperature, the narrower the gap between temperatures, the greater the amount of moisture present, leading to higher relative humidity. In the lower atmosphere, more moisture (small difference between dew point and temperature) results in lower cloud bases and increased condensation levels (LCL), which is an essential factor in determining the severity of thunderstorms.