Giant Hailstones hit Sydney 18th February 2017
A ferocious storm known as a supercell hit northwest and northern Sydney with hailstones up to 8cm smashed vehicles and skylights. The stormdeveloped explosively near Bilpin and split with the eastern storm rapidly intensifying and moving east across the northern part of the city.
Large hailstones 4cm in diameter were first report from Londonderry and also Penrith and Richmond reported larger hailstones. The stormintensified and reports came in from Rouse Hill and Box Hill of significant hailstones to the size of 5cm in diameter as the stormrapidly moved east.