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.
For a constant temperature, the smaller the gap, the greater the amount of moisture, and consequently, higher relative humidity. In the lower atmosphere, more moisture (small difference between dew point and temperature) leads to lower cloud bases and elevated condensation levels (LCL), which is a key factor in shaping severe thunderstorms.