7 day weather forecast

 Effective as of 4:00 AM Sunday May 23 2021

Explanatory notes:

Areas of fog has been observed due to radiational cooling of moist low level air with moist soils moistened by the rain.

Showers again from late morning as the land breeze dissipates and a deep cold unstable air mass moves over the region. Thunderstorms and/or small hail possible with the depth of the instability being up to above the 400 hPa level.

Thunderstorm chances diminish overnight as the upper level cold pool moves away from the region lowering the depth of the instability but further showers in the cold southwesterly air stream and a cold day with the cold air mass over the region. Shower chances diminish by night with the formation of a land breeze with the ridge of high pressure building to the south.

A cold morning on Tuesday with the radiational cooling of the already cold air. Temperature below 5°C is likely in areas with cold air drainage and even below 3°C in the usually colder areas especially if skies are mostly clear.

Fine conditions and gradually becoming warmer until Thursday with the high pressure system moving into the Great Australian Bight.

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

Sunday May 23:

City:

10-19  Degrees Celsius

Showers.

Chance of any rain:100%

Amount:5 to 15 mm

Perth Metropolitan Area:

Partly to mostly cloudy.Areas of fog early.A very high (100%) chance of showers.The chance of a thunderstorm and/or small hail from afternoon.Light winds becoming southwesterly at 20-30 km/h from afternoon.

Monday May 24:

City:

9-16  Degrees Celsius

Showers.

Chance of any rain:95%

Amount:3 to 8 mm

Perth Metropolitan Area:

Partly to mostly cloudy. A very high (95%) chance of showers.Winds south-southwesterly at 20-30 km/h becoming light at night.

Tuesday May 25:

City:

5-19  Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Light winds.

Wednesday May 26:

City:

6-20  Degrees Celsius

Partly cloudy.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Winds east-northeasterly at 10-20 km/h.

Thursday May 27:

City:

10-24  Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Amount:Nil

Perth Metropolitan Area:

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

Friday May 28:

City:

13-23  Degrees Celsius

Showers.

Chance of any rain:70%

Amount:2 to 10 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 tending northwesterly in the afternoon.

Saturday May 29:

City:

13-21  Degrees Celsius

Showers.

Chance of any rain:90%

Amount:4 to 20 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high(90%) chance of showers.The chance of a thunderstorm.Winds north-northeasterly 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).