SRI (Surface Rainfall Intensity) An estimate of rain intensity associated with different echoes. HWind (Horizontal Wind) Shows wind flow at a specific altitude. PPI (Plan Position Indicator) Gives a representation of the cloud echoes in a horizontal plane. MAX (Maximum) Shows a 2-dimensional (2D) flow for the horizontal and vertical profile of the clouds. ` EHT (Echo Height Top) Gives a representation of the height to which the top of the clouds extend.