Weather forecast for Perth effective as of 5:00 PM Monday August 20

Weather forecast for Perth effective as of 5:00 PM Monday August 20
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).

With warm air mass over the region on Sunday,it was the warmest day of winter so far with a maximum temperature of 24.3 Degrees Celsius at the Perth Metro station.

Forecast updated based on latest cloud cover.

A west coast trough strengthened early today with a weak low approaching the southwest of the state today,ahead of an upper/middle level disturbance.Plenty of middle level clouds,virga today,the chance of elevated showers and thunderstorms.Possibly warmer than yesterday,depending on cloud cover.

Plenty of low clouds from evening with the marine layer onshore.

Cold air mass lies over the region on Tuesday

The rest of Monday August 20:

City:

Rain.

Chance of any rain:70%

Perth metropolitan area:

Mostly cloudy.A high(70%) chance of rain and showers.The chance of a thunderstom.Winds northwesterly at 10-20 km/h becoming westerly at night.

Tuesday August 21:

City:

12-19 Degrees Celsius

Showers.

Chance of any rain:95%

Amount:2 to 6 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(95%) chance of showers.Winds westerly at 10-20 km/h,becoming light before dawn becoming west-southwesterly at 15-25 km/h from late morning becoming southwesterly at 20-35 km/h from afternoon,becoming south-southwesterly at 15-25 km/h at night.

Wednesday August 22:

City:

7-17 Degrees Celsius

Partly to mostly cloudy.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

Partly to mostly cloudy.A slight(20%) chance of showers.Winds south-southwesterly at 15-25 km/h.

Thursday August 23:

City:

5-18 Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.Light winds.

Friday August 24:

City:

6-20 Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.Winds northeasterly at 10-20 km/h becoming light from afternoon.

Saturday August 25:

City:

7-20 Degrees Celsius

Possible PM shower.

Chance of any rain:30%

Amount:0 to 2 mm.

Perth metropolitan area:

Sunny morning.A slight(30%) chance of showers from afternoon.Light winds becoming westerly at 10-20 km/h later during the day.

Sunday August 26:

City:

8-17 Degrees Celsius

Showers.

Chance of any rain:70%

Amount:2 to 6 mm.

Perth metropolitan area:

Partly to mostly cloudy.A high(70%) chance of showers.Winds southerly at 15-30 km/h.

Monday August 27:

City:

6-17 Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.A slight(20%) chance of a shower.Winds south-southeasterly at 10-20 km/h.

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.