Forecast for Melbourne, issued 19th December, 5am.
Wednesday : Warm and becoming humid, isolated showers and thunderstorms developing in the late morning, tending to rain later. Light NE winds, freshening later.
Min 16 Max 31
Thursday : Early rain and isolated thunderstorms, easing to a few showers. Winds shifting cooler SW early morning.
Rainfall 8 – 15 mm
Min 13 Max 22
Friday : An early shower or two then fine, mostly cloudy with light to moderate SW winds tending SE later.
Min 12 Max 21
Saturday : Fine and mild to warm, partly cloudy, with light SE winds.
Min 15 Max 27
Sunday : Fine and sunny at first, very warm with cloud increasing later and rain developing overnight. Light to moderate N/NE winds ahead of a Sw change at night.
Min 16 Max 34
Monday : Cooler with rain periods and isolated thunderstorms. Light to moderate SE winds.
Min 17 Max 26
Tuesday : Cool and cloudy with a few showers, moderate to fresh Sw easing later and tending light Se.
Min 16 Max 22
Notes on the Weather : A very active low pressure trough dominates the country, tropical moisture is being advected South into the trough from NW WA, and a high pressure ridge is over SW WA. A cold front is laying across Victoria, with a low pressure trough through NSW.
A cold front is approaching Victoria and a band of rain and isolated thunderstorms will develop today from the west. Warm weather will contract Eastwards tomorrow afternoon as a cool change moves through, leaving cooler conditions with scattered showers for most of Southern Victoria on Thursday and into Friday.
By Saturday we will see a clearance to fine and warm weather, with warm to hot conditions developing over Victoria on Sunday. As the day goes on cloud will begin to increase from the west, and on Monday a band of rain and thunderstorms will develop and become widespread across the state. This will contract Eastwards on Xmas day with cooler conditions becoming established and scattered showers will persist in the south.
On Boxing Day the weather will be cool and fine, although there may be some lingering shower activity in the East with a potential blocking pattern possible.