by Stephanie Gardiner You know it's storm season when weather reports compare hail to golf balls. As storms hit Sydney's upper north shore in February, there were reports of golf ball-sized hailstones falling at Pymble Golf Club, of all places, according to the Bureau of Meteorology's severe storm archive . A Sydney storm, seen from Narrabeen in 2015. Photo: Nick Moir Pymble and other suburbs across north Sydney make a regular appearance on the bureau's comprehensive severe storm database, which dates back to the 18th century. Suburbs in the north and north-west of the city topped NRMA Insurance's list of Sydney areas worst affected by storms, based on its 2016-17 claim data. Rain and rainbow at Clovelly Beach in March. Photo: Janie Barrett Kellyville was top of the list, followed by St Ives, Rouse Hill, Wahroonga, Turramurra, Beaumont Hills, Castle Hill, Pymble, Glenhaven, and Hornsby. Humidity and moisture from the coast also contribute, he said. The NSW areas