Looks like it here! Check the video and see how showers seem to be hooked up over the Downs and depositing rain or snow; fewer showers are making it through to the Weald. This looks like a rainshadow effect usually associated with bigger mountains like the Pennines, the Welsh hills and further afield the Rockies or the Himalayas. The rainfall shown caused serious flooding in Chichester with some roads 2 feet deep in flood water. At the same time it was snowing in London!