7 day weather forecast

 Effective as of 4:00 PM Monday May 17 2021

Explanatory notes:

It was a warm afternoon today with the warm air mass over the region. Possible showers and thunderstorms for the rest of today in the vicinity of a surface trough and ahead of an upper level trough with a moist and unstable atmosphere with steep vertical lapse rates and moist low level air with dew points as high as 19°C and Convective Available Potential Energy (CAPE) values in excess of 2000 J/kg possible.

Further showers expected tomorrow with the chance of thunderstorms with the surface trough and moisture and instability remaining over the region.

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

Possible fog early tomorrow and on Wednesday depending on cloud cover with moist low level air and moist soils from rain.

A significant cold front moves over the region on Saturday with a cold and unstable air mass in its wake.

The rest of Monday May 17:

City:

Possible showers and thunderstorms.

Chance of any rain:50%

Perth Metropolitan Area:

Partly to mostly cloudy.A medium(50%) chance of showers and thunderstorms.Gusty winds, heavy falls and hail possible with thunderstorms.Winds northwesterly at 10-20 km/h.

Tuesday May 18:

City:

15-24  Degrees Celsius

Showers.Possible thunderstorm.

Chance of any rain:70%

Amount:2 to 8 mm

Perth Metropolitan Area:

P​Partly to mostly cloudy.Areas of fog possible early.A high (70%) chance of showers.The chance of a thunderstorm.Light winds.

Wednesday May 19:

City:

12-23  Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Areas of fog possible early.A slight(20%) chance of a shower.Light winds tending south-southwesterly at 10-20 km/h in the afternoon becoming southeasterly at night.​

Thursday May 20:

City:

11-25  Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

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

Friday May 21:

City:

11-24  Degrees Celsius

Mostly sunny.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny.Light winds tending southwesterly at 10-20 km/h in the afternoon.

Saturday May 22:

City:

13-21  Degrees Celsius

Showers.

Chance of any rain:95%

Amount:6 to 15 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high (95%) chance of showers.Winds westerly at 15-30 km/h shifting southwesterly later during the day.

Sunday May 23:

City:

10-18  Degrees Celsius

Showers.

Chance of any rain:95%

Amount:8 to 15 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high (95%) chance of showers.The chance of a thunderstormWinds west-southwesterly at 20-30 km/h.

Monday May 24:

City:

10-18  Degrees Celsius

Showers.

Chance of any rain:80%

Amount:3 to 10 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high (80%) chance of showers.The chance of a thunderstormWinds southwesterly at 15-25 km/h

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).