Weather forecast for Perth effective as of 12:00 AM Wednesday April 11

Weather forecast for Perth effective as of 12:00 AM Wednesday April 11:

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 4.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 5.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 6:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).

A cold air mass lied over the region on Tuesday resulting in what was the coldest day since December last year.

How cold it becomes overnight depends on cloud cover.With low cloud cover it could easily become very cold with light winds overnight but with high cloud cover radiational cooling will be suppressed.Prospects of cloud cover are mainly from the anvil of land breeze clouds offshore trapped under a subsidence inversion.

With moist air offshore and land breeze convergence showers possible especially over coastal areas early on Wednesday,

A cold front likely brushes the region on Thursday again bringing showers but still some uncertainty at this time.

Cold air mass over the region on Friday.

Conditions rapidly become sunny and warm from the weekend as a ridge of high pressure builds.

Wednesday April 11:

City:

10-23 Degrees Celsius

Possible early shower.

Chance of any rain:30%

Amount:0 to 0.2 mm.

Perth metropolitan area:

Partly cloudy.A medium(40%) chance of showers in the southwest and coastal areas in the early hours and morning,grading to a slight(20%) chance in the northeast.Light winds tending west-southwesterly at 10-20 km/h in the afternoon and evening.

Thursday April 12:

City:

12-23 Degrees Celsius

Showers.

Chance of any rain:70%

Amount:0.4 to 2 mm.

Perth metropolitan area:

Partly to mostly cloudy.A high(70%) chance of showers.Light winds becoming west-southwesterly at 10-20 km/h becoming south-southwesterly at 15-30 km/h from afternoon.

Friday April 13:

City:

13-24 Degrees Celsius

Clouds clearing.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

Partly to mostly cloudy becoming mostly sunny from afternoon.A medium(40%) chance of showers in the early hours and morning over coastal areas grading to a near zero chance inland.Light winds becoming south-southwesterly at 20-30 km/h becoming southeasterly at 10-20 km/h later at night.

Saturday April 14:

City:

11-25 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds east-southeasterly at 10-20 km/h tending southerly in the afternoon and evening.

Sunday April 15:

City:

12-26 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 in the afternoon and evening.

Monday April 16:

City:

15-30 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds easterly at 20-30 km/h becoming light from afternoon.

Tuesday April 17:

City:

17-32 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds east-northeasterly at 15-25 km/h becoming light from afternoon.

Forecast for today produced at 12:00 AM,forecast for the rest of the days produced at 7:00 PM Tuesday April 10.Weather icons courtesy of the US National Weather Service.