Making snowflakes that can be seen through a window

Hi Folks:

I am working on a picture where there is a raging snowstorm outside the window. I’ve made the snowflakes, as well as the particle emitter, but when I freeze the storm and render the picture, the snowflakes arent really visible outside the windows. Is there an additional trick that I am missing, or what should I do?

THanks
TIM

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