7 day weather forecast

Effective as of 6:00 PM Sunday September 23

Explanatory notes:

A west coast trough lies inland,sea breeze advecting moist low level air inland.Radiational cooling of moist low level air overnight leads to the chance of areas of fog overnight and into early tomorrow.Similar conditions tomorrow night and early on Tuesday

Cooler air mass moves over the region from Tuesday,possible morning shower with the passage of a weak cold front.

Ridge of high pressure builds south thereafter,a west trough coast deepens down the west coast next weekend as an upper/middle level trough/disturbance arrives possibly bringing showers and thunderstorms and the formation of a low.

The rest of Sunday September 23:

Mostly clear.

Chance of any rain:0%

Perth metropolitan area:

Mostly clear.Patches of fog possible later tonight.Light winds.

Monday September 24:

11-22 Degrees Celsius

Possible early fog.Becoming sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Areas of fog possible early,becoming mostly sunny around noon,becoming sunny from afternoon.Patches of fog possible later at night.Light winds tending westerly at 5-15 km/h in the late morning,southwesterly at 10-20 km/h during the afternoon.

Tuesday September 25:

10-21 Degrees Celsius

Possible morning shower.

Chance of any rain:30%

Amount:0 to 0.4 mm.

Perth metropolitan area:

Areas of fog possible early.A slight(30%) chance of a morning shower.Mostly sunny thereafter.Light winds tending southwesterly at 15-25 km/h between late morning and evening becoming south-southeasterly at 5-15 km/h at night.

Wednesday September 26:

8-20 Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.Light winds tending southwesterly at 20-30 km/h during the afternoon becoming south-southeasterly at 10-20 km/h at night.

Thursday September 27:

8-22 Degrees Celsius

High clouds(mostly sunny).

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

High clouds(mostly sunny).Winds southeasterly at 15-25 km/h.

Friday September 28:

8-24 Degrees Celsius

High clouds(mostly sunny)

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

High clouds(mostly sunny).Winds easterly at 20-30 km/h.

Saturday September 29:

11-24 Degrees Celsius

Possible shower.

Chance of any rain:30%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly cloudy.A slight(30%) chance of showers.Winds east-northeasterly at 20-35 km/h.

Sunday September 30:

13-22 Degrees Celsius

Possible showers and thunderstorms.

Chance of any rain:50%

Amount:0 to 2 mm.

Perth metropolitan area:

Partly cloudy.A medium(50%) chance of showers and thunderstorms.Winds northeasterly at 10-20 km/h shifting southwesterly during the day.

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.