To make a tank drop on snow impact fx:

First, creat a few textures as blow:

 
 

one of the materials :

emitters are composed of three major part:

emitter for the stretched speedy snow:

emitter for the misty snow:

What I learned: use Size by Velocity to stretch particle size

(Size By Velocity : This module sets the size of this emitter¡¯s particles based on their current speed, where speed is the magnitude of the particle¡¯s velocity vector.

    VelocityMultiplier: This is a vector distribution (should be a curve) specifying values to multiply by the particle¡¯s speed in order to scale it before using it to set the size.)

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