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:
“Dear, why should you command me to my rest,
When now the night doth summon all to sleep?
Methinks this time becometh lovers best;
Night was ordained together friends to keep.
How happy are all other living things,
Which though the day disjoin by several flight,
The quiet evening yet together brings,
And each returns unto his love at night.”
—Michael Drayton (1563–1631)
“Sigh no more Ladies, sigh no more
Men were deceivers ever,
One foote in Sea, and one on shore,
To one thing constant never,”
—William Shakespeare (1564–1616)