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