storm

In the game "Civilisation VI rising tide", there is a "gradient dust storm". Context suggests that gradient refers to how severe it is. But I thought gradient could only mean the slope or rate of change of something?

Civilization VI: The Gathering Storm as Kupe of Māori! Don´t forget to sub, it´s free you now! Subscribe: https://www.youtube.com/c/Tvattbjorn79?sub_confirmation=1