Temporal Threshold Measure: "The Temporal Threshold Measure is an accepted standard of “Predictive Service” used to examine trends in the predictive service. The lead time required to achieve the Temporal Threshold Measure decreases with an increase in short range skill or improving service.”

Notes to definition:

• Using the Threshold Lead Time concept, one can compare Predictive Services against an accepted standard and examine changes from this standard.
• Information is revealed in the trends.  Since the absolute values of these quantities is always in question, it is more appropriate to examine the trends or deviations in the absolute values.