7 day weather forecast

Effective as of 1:00 PM Thursday October 4

Explanatory notes:

Thunderstorms formed inland with solar heating in an unstable atmosphere with cold air aloft aloft.

The weak low formed ahead of the upper/middle level trough/disturbance passes just to the southwest on Friday bringing some showers.

Thursday October 4:

Possible shower

Chance of any rain:30%

Perth metropolitan area:

Partly to mostly cloudy.A slight(30%) chance of showers.The chance of a thunderstorm over the the hills.Winds northwesterly at 20-30 km/h in the afternoon becoming light at night.

Friday October 5:

13-22 Degrees Celsius

Showers clearing.

Chance of any rain:80%

Amount:1 to 3 mm.

Perth metropolitan area:

A high(80%) chance of showers clearing to partly cloudy conditions by late afternoon.The chance of a thunderstorm in the early hours.Winds north to northwesterly at 10-20 km/h becoming west-southwesterly from afternoon light from evening.

Saturday October 6:

12-22 Degrees Celsius

Clouds decreasing.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Mostly cloudy becoming mostly sunny by late afternoon.Light winds becoming southwesterly at 20-30 km/h during the afternoon becoming southeasterly at 5-15 km/h at night.

Sunday October 7:

12-24 Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.Winds easterly at 15-25 km/h becoming south-southwesterly at 20-30 km/h from afternoon becoming southeasterly at 5-15 km/h at night.

Monday October 8:

12-24 Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.A slight(30%) chance of a shower or thunderstorm over the hills in the afternoon,grading to a near zero chance near the coast.Winds easterly at 20-30 km/h tending south-southwesterly at 15-25 km/h during the afternoon.

Tuesday October 9:

12-25 Degrees Celsius

Possible shower or thunderstorm.

Chance of any rain:30%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly cloudy.A slight(30%) chance of a shower or thunderstorm.Winds easterly at 20-30 km/h tending 10-20 km/h during the afternoon.

Wednesday October 10:

13-25 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 easterly at 10-25 km/h.

Thursday October 11:

13-25 Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.A slight(20%) chance of a shower or thunderstorm.Winds easterly at 10-20 km/h becoming light from afternoon.

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.