Weather forecast for Perth effective as of 6:00 PM Friday April 27

Weather forecast for Perth effective as of 6:00 PM Friday April 27:

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 06:00 UTC(2 PM local time today).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).

The west coast trough lied inland today resulting in a southeasterly pressure gradient which "bent" with solar heating during the day resulting in a sea breeze.Much weaker than the summer counterpart though with reduced water-land temperature gradient.

Moist low level air advects over the region from the southeast overnight.This results in the formation of low level clouds east and over the Darling Scarp,advecting westwards likely resulting in a spectacular 'waterfall" katabatic effect down the slope of the hills.

Warm air advection with a west coast trough deepening near the west coast again from Sunday.



The west coast trough moves inland on Monday with typical late autumn weather from Tuesday as a colder air mass moves over the region with some cold air advection.

The rest of Friday April 27:

City:

Clear.

Chance of any rain:0%

Perth metropolitan area:

Clear.Winds south-southwesterly at 15-25 km/h becoming south-southeasterly at 10-20 km/h at night.

Saturday April 28:

City:

14-28 Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.Winds easterly at 15-25 km/h becoming light from afternoon.

Sunday April 29:

City:

17-30 Degrees Celsius

High clouds(mostly sunny).

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

High clouds(mostly sunny).Winds northeasterly at 20-30 km/h becoming light from afternoon becoming east-northeasterly at 10-20 km/h at night.

Monday April 30:

City:

17-29 Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.Winds northeasterly at 20-30 km/h shifting west-northwesterly at 20-30 km/h later during the day becoming south-southwesterly later.

Tuesday May 1:

City:

13-21 Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:0  mm.

Perth metropolitan area:

Partly cloudy.A slight(20%) chance of showers.Winds south-southwesterly at 15-25 km/h.

Wednesday May 2:

City:

10-19 Degrees Celsius

Possible shower.

Chance of any rain:30%

Amount:0 to 0.4 mm.

Perth metropolitan area:

Partly cloudy.A slight(30%) chance of showers.Winds south-southwesterly at 15-30 km/h.

Thursday May 3:

City:

9-21 Degrees Celsius

Mostly sunny.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.Light winds.

Friday May 4:

City:

9-23 Degrees Celsius

Sunny.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Sunny.Wind seat-northeasterly at 10-20 km/h.

Forecast produced at 6:00 PM Thursday April 26.Weather icons courtesy of the US National Weather Service.