Can you explain what the dewpoint is and how it is relevant in the forecasts?
The dew point is the temperature at which water vapour condenses into liquid water. If the liquid water condenses onto objects (grass, autos, windows, an airplane wing) at a temperature above freezing, it is called dew. If it condenses onto objects at a temperature at or below freezing, it is called frost. It is important to know the dew point because it is the temperature at which clouds form. When air rises from the ground, it cools until it reaches the dew point and then a cloud forms in the atmosphere.
