Tau-value
From Glossary of Meteorology
tau-value
The time rate of changes of D-values at a fixed point defined by relation, where Δt is the change in time and ΔtD is the change in D-value during this time interval.
Tau-values are expressed in terms of feet per hour. Tau-value lines are drawn on 4D charts and compose the time dimension of these charts.
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