characteristic of the pressure tendency
From Glossary of Meteorology
Shape of the curve recorded by a barograph during the 3-h period preceding an observation, represented on the synoptic chart by a symbol with a similar shape.
Shape of the curve recorded by a barograph during the 3-h period preceding an observation, represented on the synoptic chart by a symbol with a similar shape.
Any function of time f(t) is periodic with period t if f(t) = f(t + τ) for all times t, where τ is the smallest number for which this equality holds.