Weather forecast for Perth effective as of 12:00 AM Sunday July 15

Weather forecast for Perth effective as of 12:00 AM Sunday July 15
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).

Cold frontal passage occurred yesterday evening bringing showers and also thunderstorms with instability.Gusty winds occurred ahead of the thunderstorms with a peak wind gusts of 104 km/h recorded at Melville Waters at 5:52 PM.

Thereafter at night deep cold and unstable airmass lead to further showers and isolated thunderstorms.

Plenty of showers on Sunday and Monday with a cold and unstable west-southwesterly air stream.

Whether Tuesday,Wednesday and Thursday are also showery depends on whether the high pressure ridge lies to the north or over the region.

Another cold frontal passage is likely late on Friday/early on Saturday.

Sunday July 15:

City:

7-18 Degrees Celsius

Showers.

Chance of any rain:90%

Amount:1 to 3 mm.

Perth metropolitan area:

Mostly cloudy.A very high(90%) chance of showers.Winds west-southwesterly at 15-25 km/h.

Monday July 16:

City:

11-19 Degrees Celsius

Showers.

Chance of any rain:95%

Amount:2 to 4 mm.

Perth metropolitan area:

Mostly cloudy.A very high(95%) chance of showers.Winds west-southwesterly at 20-30 km/h becoming light at night.

Tuesday July 17:

City:

6-18 Degrees Celsius

Possible shower.

Chance of any rain:30%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly to mostly cloudy.A slight(30%) chance of showers.Light winds becoming west-northwesterly at 15-25 km/h from late morning becoming westerly at 10-20 km/h at night.

Wednesday July 18:

City:

9-19 Degrees Celsius

Showers.

Chance of any rain:80%

Amount:0.4 to 2 mm.

Perth metropolitan area:

Partly to mostly cloudy.A high(80%) chance of showers.Winds west-southwesterly at 10-20 km/h.

Thursday July 19:

City:

6-19 Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

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

Friday July 19:

City:

7-21 Degrees Celsius

PM showers.

Chance of any rain:70%

Amount:1 to 6 mm.

Perth metropolitan area:

Mostly sunny morning.A high(70%) chance of showers from afternoon.The chance of a thunderstorm at night.Winds northwesterly at 20-30 km/h becoming westerly at night.

Saturday July 20:

City:

12-18 Degrees Celsius

Showers.

Chance of any rain:90%

Amount:4 to 10 mm.

Perth metropolitan area:

Mostly sunny morning.A very high(90%) chance of showers from afternoon.The chance of a thunderstorm in the morning.Winds west-northwesterly at 15-25 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.