A vector normal to isolines (also called level surfaces) pointing toward higher values. Denoted mathematically as D F, where F is the field for which the local gradient vector is being calculated. For example, pressure, geopotential height, and temperature gradients are important in meteorology.
GRADIENT
Meaning of GRADIENT in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012