Issued Sunday, September 3rd 2017. A surface trough / cold front moving through on Sunday is expected to give NSW its best snowfall for 2017 as it makes room for a vigorous Antarctic blast. Above image – Temperatures at 1500M ASL, with the area most favourable for snow in NSW circled in red via BSCH
On Sunday morning, a trough / cold front combination is situated over Southern Inland NSW stretching into North-Western NSW / South-Western QLD. This system has already produced strong winds over Western NSW and this is likely to continue for all areas, along with constant damaging gusts of 90-130km/h over the Alps over the next 4 days. The trough is also expected to generate some thunderstorms for Northern NSW. Behind the front however, a vigorous pool of Antarctic air is expected to be dragged up, covering the region and mixing with good moisture content to produce very heavy snowfall and blizzards.
The cold air is expected to arrive late on Sunday lasting until sometime on Wednesday (most likely during the afternoon / evening), with the coldest air arriving later on Monday and lasting until Tuesday evening. During the peak of the event, snow is likely to fall to as low as 500m in Southern NSW and 900m across the Central Tablelands / Blue Mountains. Falls of more than 100cm are likely over the NSW Snowy Mountains, with totals of as much as 140cm possible. The majority of this will fall over Monday and Tuesday where 48hr totals of 70-100cm are expected!
For those wondering if it will snow in Canberra.. its possible. Elevated parts of the ACT should see snow, but Canberra itself may come under the influence of a rain shadow caused by the Brindabella Ranges. A rain shadow is when the Ranges block the moisture, causing an area of dryness on the opposite side of the Range (in this case over Canberra). So while temperatures may be ideal, and elevation is spot on, a lack of moisture may occur and thats why its only “possible” and not likely.