Murph!?!?!
I realize the bugs are not flying about up there in the snow, but its the ones from last summer/fall. See now that you have new filters. Another source for air filter material that can be cut to size are the open cell foam Shop Vac pre-filters.
But, hey; do take care with those darned snow snakes! Might need a flask of brandy handy just in case of a bite. ;-)
prs