Definitions for "DEWPOINT"
of a gas is the temperature at which the vapor in a space (at a given pressure) will start to condense (form dew). Dewpoint of a gas mixture is the temperature at which the highest boiling point constituent will start to condense.
Temperature at which a vapor begins to deposit as a liquid; applies especially to water in the atmosphere
A calculated temperature at which water vapor will condense.
Keywords:  thunderstorm, dry
Dry Thunderstorm