7 day weather forecast

Effective as of 4:00 PM Saturday May 15 2021

Explanatory notes:

Plenty of high and middle level clouds associated with upper and middle level moisture ahead of a cut off low in the Indian Ocean.This leads to the chance of virga and the slight chance of showers.

A strong high pressure system in the Great Australian Bight leads to significant east-northeasterly winds during the weekend.

Some smoke haze possible with prescribed burns.

Becoming warmer with warm air advection. Cloud cover is the main limiting factor on maximum temperatures.Possibly even warmer than currently forecast on Sunday and Monday if cloud cover isn't as high given 850 hPa temperatures to around 14°C predicted by models.

A trough/cold frontal system brings showers later on Monday, on Tuesday with the possibility of thunderstorms with a moist and unstable atmosphere with moist low level air and cold air aloft ahead of an upper level trough.

Ridge of high pressure likely builds to the south thereafter leading to fine conditions with a west coast trough deepening near the west coast.

A significant cold front likely moves over the region towards the end of the forecast period but still some uncertainty on the details this far out.

The rest of Saturday May 15:

City:

Mostly cloudy.

Chance of any rain:10%

Perth Metropolitan Area:

Mostly cloudy.Areas of smoke haze possible.Winds east-northeasterly at 10-20 km/h.

Sunday May 16:

City:

14-27  Degrees Celsius

Partly to mostly cloudy.

Chance of any rain:10%

Amount:Nil

Perth Metropolitan Area:

Partly to mostly cloudy.Winds northeasterly at 15-30 km/h easing to 10-20 km/h in the afternoon.

Monday May 17:

City:

15-27  Degrees Celsius

PM shower or two, possible thunderstorm.

Chance of any rain:60%

Amount:1 to 4 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A medium (60%) chance of showers most liekly from late afternoon.The chance of a thunderstorm from late afternoon.Winds northeasterly at 15-25 km/h shifting northwesterly in the afternoon.

Tuesday May 18:

City:

15-24  Degrees Celsius

Showers.Possible thunderstorm.

Chance of any rain:80%

Amount:2 to 10 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high (80%) chance of showers.The chance of a thunderstorm.Winds west-northwesterly at 5-20 km/h shiftin southwesterly in the afternoon becoming light at night.

Wednesday May 19:

City:

12-24  Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Winds southeasterly at 10-20 km/h tending south-southwesterly at 10-20 km/h in the afternoon.

Thursday May 20:

City:

11-26  Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Sunny.Winds easterly at 10-20 km/h tending south-southwesterly at 10-20 km/h in the afternoon.

Friday May 21:

City:

11-25  Degrees Celsius

Mostly sunny.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny.Winds easterly at 10-20 km/h tending south-southwesterly at 10-20 km/h in the afternoon.

Charts:

                                   

Figure 1.Surface synoptic chart.Image courtesy of the Australian Bureau of Meteorology(BOM).

 2. 

Figure 2.Key features identified on True Colour RGB satellite image.Satellite image courtesy of the Japanese Meteorological Agency(JMA).

Figure 3.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image. Image courtesy of the Australian Bureau of Meteorology(BOM)

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

No liabilities held from information consumed on this site. Weather icons are from the US National Weather Service.Some information on this site is from the Australian Bureau of Meteorology (BOM).