Growing up we had a tile front porch, it was glazed tiles, and was
beyond hazardous in wet weather, snow and ice made it all the worse. My
Dad finally covered it wit outdoor carpet even though by then everyone
had been trained to immediately get a death grip on the porch rail and
slowly skid themselves to the door or steps depending on direction of
travel. I bring this up, mainly to bring up safety concern with
traction if snow blows into the screen porch. Granted glazed is the
worst case scenario, but any given tile is slipperier than any given
carpet.