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:
“In a time of war the nation is always of one mind, eager to hear something good of themselves and ill of the enemy. At this time the task of news-writers is easy, they have nothing to do but to tell that a battle is expected, and afterwards that a battle has been fought, in which we and our friends, whether conquering or conquered, did all, and our enemies did nothing.”
—Samuel Johnson (1709–1784)
“It is useless to contend with the irresistible power of Time, which goes on continually creating by a process of constant destruction.”
—E.T.A.W. (Ernst Theodor Amadeus Wilhelm)