7 day weather forecast

  Effective as of 4:00 PM Sunday May 23 2021

Explanatory notes:

Plenty of showers with the deep cold unstable air mass over the region with the possibility of thunderstorms and/or small hail. Thunderstorm and small hail chances decrease after midnight with the depth of instability decreasing.

Overnight and tomorrow morning, winds could become light for much of the time with boundary layer decoupling due to the pool of rain cooled air near the surface and cold air attempting to move down the hills. However, heavier showers moving from the showers could lead to strong southwesterlies from time to time. Plenty of showers expected, enhanced by the land breeze convergence with the southwesterlies. 

Showers continue into the afternoon becoming lighter as depth of the instability decreases and showers clear by night with the development of a land breeze.

Cold morning on Tuesday, how cold is dependent on cloud cover, latest NWP guidance show more cloud cover compared to the guidance yesterday, this cloud cover would limit how cold it gets. Another cold morning on Wednesday.

Becoming warm again with the high pressure system moving into the Great Australian Bight.

A cold front ahead of an upper level trough likely arrives from Friday bringing showers with the possibility of thunderstorms with instability but still some uncertainty on the details this far out.

The rest of Sunday May 23:

City:

Showers.Possible thunderstorm.

Chance of any rain:95%

Perth Metropolitan Area:

Partly to mostly cloudy. very high (95%) chance of showers.The chance of a thunderstorm/and or small hail.Winds west-southwesterly at 20-30 km/h becoming southwesterly in the evening.

Monday May 24:

City:

9-16  Degrees Celsius

Showers.

Chance of any rain:95%

Amount:3 to 10 mm

Perth Metropolitan Area:

Partly to mostly cloudy. A very high (95%) chance of showers.The chance of a thunderstorm and/or small hail early.Winds south-southwesterly at 15-30 km/h tending light inland in the morning and becoming light at night.

Tuesday May 25:

City:

6-19  Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Light winds.

Wednesday May 26:

City:

7-20  Degrees Celsius

Partly cloudy.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.High clouds.Winds northeasterly at 15-25 km/h.

Thursday May 27:

City:

10-24  Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Winds northeasterly at 15-25 km/h tending northwesterly in the afternoon.

Friday May 28:

City:

12-24  Degrees Celsius

Showers.Possible thunderstorm.

Chance of any rain:70%

Amount:2 to 8 mm

Perth Metropolitan Area:

Partly cloudy.A high(70%) chance of showers.The chance of a thunderstorm.Winds north-northeasterly at 10-25 km/h.

Saturday May 29:

City:

14-22  Degrees Celsius

Showers and thunderstorms.

Chance of any rain:95%

Amount:6 to 20 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high(95%) chance of showers and thunderstorms.Winds northwesterly at 15-25 km/h.

Sunday May 30:

City:

13-20  Degrees Celsius

Showers.

Chance of any rain:80%

Amount:2 to 10 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high(80%) chance of showers.Winds 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).

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