7 day weather forecast

  Effective as of 4:00 PM Thursday May 13 2021

Explanatory notes:

A strong ridge of high pressure to the south is resulting in a rigorous east-southeasterly flow with gusts to 80 km/h over Pearce RAAF this morning, 82 km/h at Gooseberry Hills.

Further gusty winds overnight tonight and early tomorrow.

Areas of smoke haze are possible with prescribed burns over the hills and easterly gradient flow.

Gradient flow shifts northeasterly overnight and remains northeasterly during the weekend, surface flow east-northeasterly tomorrow and on Saturday becoming northeasterly on Sunday. This means that smoke haze from prescribed burns becomes more restricted to the south from the weekend if most of the prescribed burns are to the east and south.

Upper and middle level moisture ahead of a cut off low in the Indian Ocean leads to high and middle level clouds over the region with the chance of virga and showers.

Very warm afternoon on Sunday and Monday, possibly even warmer than currently forecast if cloud cover isn't as high given 850 hPa temperatures to around 14°C predicted by models.

A trough/cold frontal system likely brings showers early next working week 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. Still some uncertainty on the details.

Ridge of high pressure likely builds to the south thereafter leading to fine conditions.

The rest of Thursday May 13:

City:

Partly cloudy.

Chance of any rain:0%

Perth Metropolitan Area:

Partly cloudy.Areas of smoke haze possible.Winds east-southeasterly at 15-30 km/h.Gusts up to 60 to 70 km/h possible about the hills and foothills later at night.

Friday May 14:

City:

12-23  Degrees Celsius

Mostly cloudy.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Mostly cloudy.Areas of smoke haze possible.A slight(20%) chance of a shower.Winds east-northeasterly at 20-30 km/h.Gusts up to 60 to 70 km/h possible about the hills and foothills early.

Saturday May 15:

City:

14-24  Degrees Celsius

Mostly cloudy.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Mostly cloudy.A slight(20%) chance of a shower.Winds northeasterly at 20-30 km/h easing to easterly at 10-20 km/h in the afternoon.

Sunday May 16:

City:

14-27  Degrees Celsius

Partly to mostly cloudy.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Partly to mostly cloudy.A slight(20%) chance of a shower.Winds northeasterly at 20-30 km/h easing to 10-20 in the afternoon.

Monday May 17:

City:

16-27  Degrees Celsius

Possible showers

Chance of any rain:30%

Amount:0 to 6 mm

Perth Metropolitan Area:

Partly cloudy.A medium(40%) chance of showers most likely from afternoon.The chance of a thunderstorm from afternoon.Winds northeasterly at 15-25 km/h shifting northwesterly in the afternoon.

Tuesday May 18:

City:

15-24  Degrees Celsius

Showers.

Chance of any rain:70%

Amount:2 to 8 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high(70%) chance of showers.The chance of a thunderstorm.Winds northwesterly at 10-20 km/h.

Wednesday May 19:

City:

13-24  Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.A slight(20%) chance of a shower.Light winds.

Thursday May 120:

City:

11-25  Degrees Celsius

Mostly sunny.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny.Light winds.

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).