The bottom line is - should the outside air temperature decrease to equal the "dew point" temperature, dew will form on grass or leaves.

Should the dew point temperature be the same as the outdoor air temperature, the air is 100% saturated with moisture. Theoretically the air can't hold any more moisture.
Should more moisture moves in or the out door temperature decreases then either clouds or fog will form - moisture droplets become visible.
From there, should even more moisture advect in or the air temperature falls (cools even more) visible tinny moisture droplets will increase in size and eventually become so heavy, they will fall to the ground as rain.

The bottom line is - should the outside air temperature decrease to equal the "dew point" temperature, dew will form on grass or leaves.

Should the dew point temperature be the same as the outdoor air temperature, the air is 100% saturated with moisture. Theoretically the air can't hold any more moisture.
Should more moisture moves in or the out door temperature decreases then either clouds or fog will form - moisture droplets become visible.
From there, should even more moisture advect in or the air temperature falls (cools even more) visible tinny moisture droplets will increase in size and eventually become so heavy, they will fall to the ground as rain.

Please: Ask your weather person. He / She will tell you that "we need Precipitable Water"!

Could you add 1000-500MB thickness to the list of available parameters. With winter approaching it's good to forecast the movement of the 540 line. Also, thickness lines are helpful in locating a front.
Thank you.