Heavy rain and large hail smashed Sydney this afternoon in a severe thunderstorm. A storm cell developed near Warragamba before crossing southwestern Sydney and racing towards the city and out to sea. The severe thunderstorm brought large hail the size of ten cent pieces as well as driving heavy rain to the city and many inner west suburbs. There were also reports of flash flooding. The brief thunderstorm brought 10mm in just 10 minutes to the city amongst the hail while near the germination of the storm Cantebury gained 5mm in ten minutes. At the time of the storm temperatures plunged with Olympic Park dropping nine degrees in ten minutes with winds gusting to 61km/h. Bankstown also dropped 7 degrees in 20 minutes as the storm hit. Another thunderstorm developed near Parramatta at around 2pm before heading east along the river, bringing heavy rain.