Weather forecast for Perth effective as of 2:00 AM Sunday May 6

Weather forecast for Perth effective as of 2:00 AM Sunday May 6
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 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).

It was extremely dry on Saturday with dry air aloft having mixed down.Dew point at Perth Airport dipped to around -15 Degrees Celsius with a relative humidity of around 5%!It was also relatively warm with the warm air mass over the region.

The extremely dry air meant that excellent radiational cooling has resulted in rapid temperature drop.

Some smoke haze also lied aloft.

Middle and high level cloud affect the region in the next few hours.Virga,possibly reaching the ground from time to time.

A cold front/low pressure trough moves over the region in the morning bringing some showers.Gusty winds possible with strong winds aloft.Some stratocumulus clouds bringing further showers behind the cold front with moist air trapped under a subsidence inversion.

Because the low originated from a tropical cyclone in the tropics,the air mass behind the front won't be that cold.

Then improving weather conditions with a high pressure ridge building over the region.

The high pressure ridge lies to the south of the region mid working week hence the possibility of smoke haze depending on location of prescribed burns with easterly winds.

A wet coast trough deepens near the west coast with warm air advection,leading to warm conditions on Friday.

Sunday May 6:

City:

14-23 Degrees Celsius

Showers.

Chance of any rain:95%

Amount:1 to 4 mm.

Perth metropolitan area:

Mostly cloudy.The chance of areas of smoke haze in the early hours.A very high(95%) chance of showers.The chance of a thunderstorm.Winds north-northwesterly at 10-25 km/h becoming northwesterly at 20-30 km/h in the morning becoming west-southwesterly at 30-45 km/h from late morning becoming south-southwesterly at 15-25 km/h at night.Gusty winds possible.

Monday May 7:

City:

11-22 Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Partly  cloudy.Light winds tending south-southwesterly at 10-20 km/h in the afternoon and evening.

Tuesday May 8:

City:

9-24 Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.Light winds becoming south-southwesterly at 15-25 km/h from around the middle of the day becoming southeasterly at 10-20 km/h at night.

Wednesday May 9:

City:

11-26 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds east-southeasterly at 15-30 km/h.

Thursday May 10:

City:

15-27 Degrees Celsius

High clouds(mostly sunny).

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

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

Friday May 11:

City:

16-28 Degrees Celsius

High clouds(mostly sunny).

Chance of any rain:5%

Amount:0 mm.

Perth metropolitan area:

High clouds(mostly sunny).Winds northeasterly at 15-25 km/h shifting northwesterly later.

Saturday May 12:

City:

16-26 Degrees Celsius

Mostly sunny.

Chance of any rain:5%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.Light winds tending west-northwesterly at west-southwesterly at 10-20 km/h during the afternoon and evening.

Forecast for today produced at 2:00 AM,forecast for the rest of the days produced at 5:30 PM Friday May 4.Weather icons courtesy of the US National Weather Service.