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:
“Child of the pure unclouded brow
And dreaming eyes of wonder!
Though time be fleet, and I and thou
Are half a life asunder,
Thy loving smile will surely hail
The love-gift of a fairy-tale.”
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)
“A constant smirk upon the face, and a whiffling activity of the body, are strong indications of futility.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)