Forecast for Melbourne, issued 15th December, 5am.
Saturday : Areas of rain and isolated thunderstorms, local heavy falls possible later about the ranges. Humid with light winds tending Sw later and freshening. Rainfall 15 – 20 mm
Min 20 Max 27
Sunday : Rain areas, mainly about the ranges, easing to a few showers. Cooler with SW winds becoming fresh during the day. Rainfall 5 – 10 mm.
Min 13 Max 22
Monday : Cool and partly cloudy with a few showers especially in the SE. Fresh Sw winds tending S/SE and easing.
Min 13 Max 20
Tuesday : Fine, mild and partly cloudy, light winds and afternoon seabreezes.
Min 14 Max 24
Wednesday : Warm and humid, showers and thunderstorms developing, light NE winds and afternoon seabreezes..
Min 16 Max 28
Thursday : Cooler with a few showers, moderate SW winds easing later.
Min 13 Max 23
Friday : An early shower or two then fine, mostly cloudy with light to moderate SW winds tending SE later.
Min 14 Max 23
Early look for Xmas : Warm, we should see fine weather possibly on Xmas Eve, then showers and thunderstorms for both Xmas day and Boxing Day.
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, an very strong upper level low is over SW WA, near Perth. Another trough is producing showers and thunderstorms across Victoria, on Friday it will be humid, and showers and thunderstorms will tend to rain in the afternoon from the west, but mainly on the ranges.
On Friday Rain and thunderstorms will develop from the west later and reach Central Victoria in the afternoon, where it will become slow moving and persist for the better part of the weekend. A low pressure system will develop in the low pressure trough on Saturday, and widespread heavy rain with locally heavy falls will develop across much of central and Eastern Vic. On Sunday the Low will move to Gippsland and cooler showery weather will follow, with strong to gale force winds easing.
Early next week we will see clearance as a high pressure ridge moves through and we see a brief return to fine weather, before another low pressure trough arrives on Wednesday and showers and thunderstorms develop from the west.