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Weather forecast for Perth effective as of 5:00 PM Saturday March 17:

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 2.Key features identified on True Colour RGB satellite image at around 07:00 UTC(3 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).

A weak cold front brushed over the region this morning having brought some light showers and drizzle and a colder air mass behind,as a result today was a relatively cool day.


High pressure ridge rapidly builds to the south leading to clearing conditions in the next few hours with subsidence.


A west coast trough forms near the west coast from tomorrow leading to  warm air advection.Some uncertainty on how hot it will be mid week with variation between models and ensemble members but it could be very hot.High level clouds also likely with tropical moisture from a tropical weather system in the Southern Indian Ocean streams aloft in a subtropical jet stream.

The west coast trough likely moves inland back by next Thursday.

Plenty of uncertainty on the precise synoptic conditions late during the week as it depends on the movement of Tropical Cyclone Marcus but an easterly pressure gradient is likely.

Saturday March 17:

City:

Becoming clear.

Chance of any rain:0%

Perth metropolitan area:

Mostly clear becoming clear by night.Winds south-southwesterly at 20-35 km/h becoming south-southeasterly at 15-25 km/h at night.

Sunday March 18:

City:

12-27 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds east-southeasterly at 5-15 km/h becoming south-southwesterly at 15-30 km/h in the afternoon and evening over western suburbs becoming south-southeasterly at 5-15 km/h at night.

Monday March 19:

City:

16-32 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds east-southeasterly at 10-20 km/h tending south-southwesterly at 10-25 km/h in the afternoon and evening over western suburbs.

Tuesday March 20:

City:

20-34 Degrees Celsius

High clouds(partly cloudy).

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

High clouds(partly cloudy).Winds easterly at 20-35 km/h easing to east-northeasterly 15-25 km/h during the afternoon increasing to easterly at 20-30 km/h later at night.

Wednesday March 21:

City:

23-36 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 in the early hours and morning.Winds east-northeasterly at 20-35 km/h easing to easterly at 15-25 km/h from afternoon.

Thursday March 22:

City:

20-28 Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.Light winds becoming southwesterly at 15-25 km/h during the day becoming south-southwesterly at 10-20 km/h at night.

Friday March 23:

City:

16-27 Degrees Celsius

Mostly sunny.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny,high clouds.Winds south-southeasterly at 15-25 km/h tending south-southwesterly at 20-30 km/h during the afternoon and evening.

Saturday March 24:

City:

15-28 Degrees Celsius

Mostly sunny.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny,high clouds.Winds east-southeasterly at 15-30 km/h.

Forecast produced at 5:00 PM Saturday March 17.Weather icons courtesy of the US National Weather Service.