Weather forecast for Perth effective as of 5:00 PM Thursday August 30

Weather forecast for Perth effective as of 5:00 PM Thursday August 30
Explanatory notes:
Scroll down below this section for forecast. 

Figure 1.Surface synoptic chart at 12 UTC(8 PM local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM)

Figure 3.Key features identified on True Colour RGB satellite image at around 06:00 UTC(2 PM local time yesterday).Satellite image courtesy of the Japanese Meteorological Agency(JMA).

Figure 4.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image at 12 UTC(8 PM 
local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).

Figure 4:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).

Deep,cold and unstable air mass lied over the regionyesterday with a weak low within the vicinity of the area in the early hours,strong southwesterly pressure gradient in the late afternoon and evening.Showers and strong wing contracted to coastal areas at night with a more southerly steering flow.

Today,slight chance of showers near the coast early,mostly sunny with shallow convective clouds increasing during the afternoon,cold air mass lies over the region with a south-southwesterly pressure gradient.

"Anticyclone gloom" affects the region on Friday with moist low level air trapped under a subsidence inversion.

The next cold front likely moves across the region next Tuesday with a cold air mass over the region thereafter.

The rest of Thursday August 30:

City:

Partly to mostly cloudy

Chance of any rain:0%

Perth metropolitan area:

Partly to mostly cloudy.Winds south-southwesterly at 15-30 km/h becoming light at night.

Friday August 31:

City:

7-17 Degrees Celsius

Possible drizzle.

Chance of any rain:30%

Amount:0 to 0.2 mm.

Perth metropolitan area:

Cloudy.A slight(30%) chance of light showers and/or drizzle.Light winds.

Saturday September 1:

City:

8-19 Degrees Celsius

Partly to mostly cloudy.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Partly to mostly cloudy.A slight(20%) chance of a shower over the hills in the afternoon,a near zero chance elsewhere.Light winds.

Sunday September 2:

City:

7-21 Degrees Celsius

Partly cloudy.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.Light winds.

Monday September 3:

City:

5-19 Degrees Celsius

Possible PM shower.

Chance of any rain:30%

Amount:0 to 0.4 mm.

Perth metropolitan area:

Mostly sunny morning.A slight(30%) chance of a shower from afternoon.Light winds tending westerly at 15-30 km/h from late morning until evening.

Tuesday September 4:

City:

9-18 Degrees Celsius

Showers.

Chance of any rain:90%

Amount:2 to 8 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(90%) chance of showers.Winds west-southwesterly at 20-30 km/h.

Wednesday September 5:

City:

8-15 Degrees Celsius

Shower or two.

Chance of any rain:60%

Amount:0 to 2 mm.

Perth metropolitan area:

Partly to mostly cloudy.A medium(60%) chance of showers.Winds south-southwesterly at 20-30 km/h.

Thursday September 6:

City:

5-16 Degrees Celsius

Mostly cloudy.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

Mostly cloudy.A slight(20%) chance of a shower.Light winds.

Forecast for today produced at 12:00 AM,forecast for the rest of the days produced at 4:20 PM Wednesday July 11.Weather icons courtesy of the US National Weather Service.