7 day weather forecast

Effective as of 4:00 PM Thursday October 18

Explanatory notes:



A cold frontal passage early on Thursday brought showers,deep cold air mass thereafter,broight showers,isolated thunderstorms.Showers ease overnight as subsidence inversion height lowers,mainly dry but mostly cloudy by tomorrow afternoon.

Showers more likely again on Saturday in moist northwesterly flow.

Another cold frontal passage on Sunday.

The rest of Thursday October 18:

Showers easing.Possible thunderstorm clearing.

Chance of any rain:95%

Perth metropolitan area:

Partly to mostly cloudy.A very high(95%) chance of showers.The chance of a thunderstorm and/or small hail clearing by evening.Winds southwesterly at 25-40 km/h

Friday October 19:

10-19 Degrees Celsius

Shower or two clearing.

Chance of any rain:50%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly to mostly cloudy.A medium(50%) chance of showers easing to a slight(20%) chance from late morning.Light winds tending southwesterly at 10-20 km/h between late morning and evening.

Saturday October 20:

11-21 Degrees Celsius

Showers.

Chance of any rain:60%

Amount:0 to 1 mm.

Perth metropolitan area:

Mostly cloudy.A medium(60%) chance of  showers.Light winds becoming northwesterly at 20-30 km/h from morning becoming westerly at 15-25 km/h from evening.

Sunday October 21:

14-20 Degrees Celsius

Showers.

Chance of any rain:95%

Amount:1 to 4 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(95%) chance of showers.Winds westerly at 20-35 km/h becoming southwesterly from around the middle of the day.

Monday October 22:

12-20 Degrees Celsius

Possible shower.

Chance of any rain:30%

Amount:0 to 0.4 mm.

Perth metropolitan area:

Partly to mostly cloudy.A slight(30%) chance of a shower.Winds southwesterly at 15-25 km/h becoming light at night.

Tuesday October 23:

8-22 Degrees Celsius

Mostly sunny.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.A slight(20%) chance of a shower.Light winds tending west-southwesterly at 10-25 km/h during the day.

Wednesday October 24:

12-20 Degrees Celsius

Possible showers.

Chance of any rain:50%

Amount:0 to 3 mm.

Perth metropolitan area:

Partly cloudy.A medium(50%) chance of showers.Winds west-southwesterly at 15-30 km/h.

Thursday October 25:

11-21 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 a shower.Winds west-southwesterly at 20-30 km/h.

Charts:

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 3.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).

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.