I wouldn't be too concerned about the weather. I would be much more concerned about some muppet driving onto the rwy in his/her car.
In all seriousness, the pilot would have fully briefed on rwy data,made a VFR approach and made provisions for the taxyways and entrances to the rwy to be blocked off - but there again that doesn't mean that some daft sod will not trundle over the grass !!
