WIDESPREAD showers and some thunderstorms and snow will affect a broad area of NSW during the next few days.
A large pool of cold air approaching Australia from the south will interact with warmer, moisture-laden air from the north to produce several days of dynamic weather across south-eastern Australia from Friday.
In NSW, showers and some thunderstorms will develop across most inland districts and some coastal areas each day between Friday and Sunday.
During this period, falls from this system will be heaviest along the western slopes and about the northern coast and ranges.
However, accumulated three-days totals will vary quite a bit from place to place. Some areas are expected to see 10 to 20 millimetres, particularly under thunderstorms, and others are likely to miss out altogether.
The cold air mass will also allow some of this week's rain to fall as snow, helping top up the natural snow base in the alps.
Snow should start falling near the alpine peaks on Friday and could drop to 1100 to 1200 metres from late Saturday into Sunday.
All up, this system could drop around five to 15 centimetres of snow in the alps.
Looking ahead, the upper-level pool of cold air will move over the Tasman Sea early next week.
As the cold air interacts with relatively warm water in the western Tasman Sea, a low pressure system could rapidly deepen near the NSW coast on Monday and Tuesday.
As of Wednesday, there was still a high degree of model uncertainty regarding the development of this low, making it difficult to predict its impacts.
While there is still a wide range of possible outcomes, this system has the potential to cause intense and dangerous weather in parts of eastern NSW at the beginning of next week.
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