Sydney is expecting it's second 'Southerly Buster' in a week, which will bring an end to the recent heat. Sydney-siders are enjoying another day of 30 degree plus temperatures, as northwest winds drag interior heat into eastern NSW. This heat is being forced in ahead of a cooler change. After calmer conditions in the morning, an abrupt and gusty wind change will hit later this afternoon from the south, which is the so-called 'Southerly Buster'. One may remember last Sunday when a similar change occurred. On that occasion, the change hit at 11:30am suddenly dropping temperatures from 31 degrees to 22 in just five minutes! Sydney typically experiences around 10 Southerly Busters per year, which are characterised by squally wind gusts above 55km/h and temperature drops of around 10 degrees in a matter of minutes. These changes are not typically associated with any rainfall. Today's Southerly Buster will be no exception to the text-book definition. As it arrives this afternoon, temperatures will take a sharp dive while southerly winds howl at up to 70km/h along the coast. While conditions will remain dry this evening, cool and wet weather is in store this weekend.