Weather forecast for Perth effective as of 5:00 PM Saturday August 18

Weather forecast for Perth effective as of 5:00 PM Saturday August 18
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).

Warm air advection with a warm air mass over the region by Sunday resulting in the warmest day since May or June likely and also on Monday.

A West coast trough strengthens bear the west coast with an upper/middle level disturbance moving across the region on Monday.

The rest of Saturday August 18:

City:

Clear.

Chance of any rain:0%

Perth metropolitan area:

Clear.Light winds becoming easterly at 5-15 km/h later at night.

Sunday August 19:

City:

8-24 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds northeasterly at 10-25 km/h becoming light by afternoon.

Monday August 20:

City:

12-25 Degrees Celsius

Possible shower.

Chance of any rain:30%

Amount:0 to 2 mm.

Perth metropolitan area:

Partly cloudy.A slight(30%) chance of showers.The chance of a thunderstorm.Winds northeasterly at 15-25 km/h shifting westerly later during the day.

Tuesday August 21:

City:

12-18 Degrees Celsius

Showers.

Chance of any rain:70%

Amount:1 to 5 mm.

Perth metropolitan area:

Partly to mostly cloudy.A high(70%) chance of showers.Winds southwesterly at 20-35 km/h.

Wednesday August 22:

City:

7-17 Degrees Celsius

Possible shower.

Chance of any rain:30%

Amount:0 to 0.4 mm.

Perth metropolitan area:

Partly cloudy.A slight(30%) chance of showers.Winds south-southwesterly at 15-25 km/h.

Thursday August 23:

City:

6-19 Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.Light winds.

Friday August 24:

City:

7-21 Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.Winds northeasterly at 10-20 km/h becoming light from afternoon.

Saturday August 25:

City:

9-20 Degrees Celsius

Shower or two.

Chance of any rain:50%

Amount:0 to 5 mm.

Perth metropolitan area:

Partly cloudy.A medium(50%) chance of showers.Winds northwesterly at 15-25 km/h becoming southwesterly from afternoon.

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.