Weather forecast for Perth effective as of 5:00 PM Monday August 13

Weather forecast for Perth effective as of 5:00 PM Monday August 13
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).

A cold front and associated rain band moves across the region late tonight/early on Tuesday,with a southwesterly air stream thereafter leading to partly to mostly conditions with showers,especially from afternoon .

With somewhat westerly air stream showers continue until Friday.

Some uncertainty on the precise synoptic conditions from late next weekend with large variation between models and model ensembles.

The rest of Monday August 13:

City:

Possible night shower or two.

Chance of any rain:40%

Perth metropolitan area:

Sunny becoming partly cloudy later at night.A high(70%) chance of showers at night in the southwest,grading to a slight(20%) chance in the northeast.Winds north-northwesterly at 25-40 km/h.

Tuesday August 14:

City:

12-18 Degrees Celsius

Rain then shower or two.

Chance of any rain:100%

Amount:5 to 15 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(100%) chance of rain in the early hours easing to a medium(50%) chance of showers by early morning,most likely from afternoon.Winds west-southwesterly at 10-25 km/h becoming southwesterly at 15-25 km/h from morning becoming light at night.

Wednesday August 15:

City:

8-17 Degrees Celsius

Shower or two.

Chance of any rain:50%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly cloudy.A medium(50%) chance of showers.Light winds.

Thursday August 16:

City:

8-18 Degrees Celsius

Shower or two.

Chance of any rain:50%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly cloudy.A medium(50%) chance of showers.Light winds tending westerly at 15-25 km/h during the day.

Friday August 17:

City:

10-19 Degrees Celsius

Shower or two.

Chance of any rain:50%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly to mostly cloudy.A medium(50%) chance of showers.Light winds.

Saturday August 18:

City:

7-20 Degrees Celsius

Mostly sunny.

Chance of any rain:10%

Amount:0  mm.

Perth metropolitan area:

Mostly sunny.Light winds.

Sunday August 19:

City:

9-22 Degrees Celsius

Mostly sunny.

Chance of any rain:20%

Amount:0  mm.

Perth metropolitan area:

Mostly sunny.A slight(20%) chance of a shower.Winds north-northeasterly at 15-25 km/h.

Monday August 20:

City:

9-19 Degrees Celsius

Possible showers.

Chance of any rain:40%

Amount:0 to 3 mm.

Perth metropolitan area:

Partly cloudy.A medium(40%) chance of showers.Winds west-southwesterly 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.