Weather forecast for Perth effective as of 5:00 PM Wednesday March 21

Weather forecast for Perth effective as of 5:00 PM Wednesday March 21:

Explanatory notes:
Scroll down below this section for forecast. 

Figure 1.Surface synoptic chart at  06 UTC(2 PM local time today).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 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 today).Image courtesy of the Australian Bureau of Meteorology(BOM).

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

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Today was second hottest day of the year.A sea breeze had developed.Today was hotter than any day of summer.A day hotter than the hottest day of summer after the Autumn Equinox has not happened in more than 100 years(last occurred in 1914).It has never happened at the Mount Lawley site.


The west coast trough  moves inland tomorrow with the marine layer advecting inland.Some marine layer clouds expected.

A more easterly pressure gradient redevelops from Friday as a ridge of high pressure builds to the south with Tropical Cyclone Marcus to the northwest.

A rain band extending from Tropical Cyclone Marcus possibly affects the region on Saturday with the remnants of Tropical Cyclone Marcus likely to move over the region on Monday bringing rain and showers.There is no need to be alarmed as the cyclone would be quite weak then as it rapidly weakens during the weekend upon encountering cool sea surface temperatures and vertical wind shear associated with the subtropical jet stream.

Cooler air mass then lies over the region with sunny conditions by Wednesday with a ridge of high pressure building to the south.

Wednesday March 21:

City:

Partly cloudy.

Chance of any rain:0%

Perth metropolitan area:

Partly cloudy.Winds southwesterly at 5-15 km/h becoming southerly at night

Thursday March 22:

City:

21-28 Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny,high clouds.Winds northeasterly at 10-20 km/h becoming northerly before dawn becoming southwesterly at 15-25 km/h during the day becoming south-southwesterly at 10-20 km/h at night.

Friday March 23:

City:

17-30 Degrees Celsius

Partly cloudy.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Partly cloudy.Winds south-southeasterly at 10-20 km/h becoming south-southwesterly at 20-30 km/h from afternoon becoming southeasterly at 10-20 km/h at night.

Saturday March 24:

City:

18-28 Degrees Celsius

Possible light rain at times.

Chance of any rain:30%

Amount:0 to 1 mm.

Perth metropolitan area:

Mostly cloudy,high clouds.A slight(30%) chance of light rain rain.Winds east-southeasterly at 15-25 km/h.

Sunday March 25:

City:

17-29 Degrees Celsius

Partly to mostly cloudy.

Chance of any rain:10%

Amount:0 mm.

Perth metropolitan area:

Partly to mostly cloudy.Winds easterly at 20-30 km/h.

Monday March 26:

City:

20-26 Degrees Celsius

Rain.

Chance of any rain:70%

Amount:2 to 6 mm.

Perth metropolitan area:

Cloudy.A high(70%) chance of rain and showers.Winds northeasterly at 15-30 km/h shifting westerly during the day becoming south-southwesterly at 15-25 km/h at night.

Tuesday March 27:

City:

16-23 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 south-southwesterly at 15-30 km/h.

Wednesday March 28:

City:

12-25 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds east-southeasterly at 10-20 km/h tending south-southwesterly at 15-30 km/h in the afternoon and evening.

Forecast  produced at 5:00 PM Wednesday March 21.Weather icons courtesy of the US National Weather Service.