On a few of my lawns I have seen a white mold. It seems more hairy than powdery mildew could it be gray snow mold? A month ago we had record lows for here (Washington State) 18-20 degrees at night and then 50's in the day time. Now we have been having upper 40's at night and upper 50's to low 60's in the day. My guess from pictures is snow mold but can this be, I thought that mostly came after snow has been on the lawn for a length of time and melted. Could a week of tempertures in the teens a night cause this?