A time constant is the amount of time it takes for a meteorological sensor to respond to a rapid change in a measurand until it is measuring values within the accuracy tolerance usually expected of the sensor.
This most often applies to measurements of temperature, dewpoint temperature, humidity and air pressure. Radiosondes are especially affected due to their rapid increase in altitude.
Famous quotes containing the words time and/or constant:
“Who in the same given time can produce more than others has vigor; who can produce more and better, has talents; who can produce what none else can, has genius.”
—Johann Kaspar Lavater (1741–1801)
“Friendship is never established as an understood relation.... It is a miracle which requires constant proofs. It is an exercise of the purest imagination and the rarest faith.”
—Henry David Thoreau (1817–1862)