Weather forecast for Perth effective as of 4:00 PM Saturday July 21

Weather forecast for Perth effective as of 4:00 PM Saturday July 21
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).

Post cold frontal showers for the rest of today.A cold front will brush the region tomorrow with strong pressure gradient thereafter to lead to strong gusty winds,gusts in excess of 90 km/h possible near the coast and in the southwest.With deep cold air mass over the region from afternoon,can't rule out the possibility of thunderstorms and/or small hail,most likely in the south.

With the subtropical high pressure ridge lying to the north continued showery weather on Monday and Tuesday,another cold frontal passage likely on Wednesday.

The rest of Saturday July 20:

City:

Showers.

Chance of any rain:80%

Perth metropolitan area:

Partly to mostly cloudy.A high(80%) chance of showers.Winds west-northwesterly at 20-30 km/h.

Sunday July 21:

City:

13-18 Degrees Celsius

Windy with showers.Possible thunderstorm.

Chance of any rain:100%

Amount:4 to 12 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(100%) chance of showers.The chance of thunderstorms and/or small hail in the afternoon and evening most likely in the south.Winds westerly at 20-35 km/h increasing to 35-55 km/h from afternoon.Gusty winds likely from afternoon,gusts possibly exceeding 90 km/h near the coast and in the far southwest,80 km/h elsewhere.

Monday July 22:

City:

11-19 Degrees Celsius

Showers.

Chance of any rain:90%

Amount:0.4 to 3 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(90%) chance of showers.Winds westerly at 20-35 km/h easing to 10-20 km/h at night.

Tuesday July 23:

City:

10-19 Degrees Celsius

Showers.

Chance of any rain:80%

Amount:0.4 to 3 mm.

Perth metropolitan area:

Partly cloudy.A high(80%) chance of showers.Light winds becoming northwesterly at 10-20 km/h during the day becoming north-northwesterly at night.

Wednesday July 24:

City:

11-18 Degrees Celsius

Showers.

Chance of any rain:100%

Amount:10 to 20 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(100%) chance of showers.The chance of a thunderstorm.Winds northwesterly at 25-40 km/h shifting southwesterly later easing to 15-25 km/h at night.Gusty winds possible.

Thursday July 25:

City:

8-17 Degrees Celsius

Mostly cloudy.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

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

Friday July 26:

City:

8-19 Degrees Celsius

Possible shower or two.

Chance of any rain:40%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly to mostly cloudy.A medium(40%) chance of showers.Winds westerly at 15-25 km/h.

Saturday July 27:

City:

8-19 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.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.