Effective as of 4:00 PM Monday September 21 2020
Explanatory notes:A weak trough brings showers early on Tuesday, clearing by late morning.
Warm air mass moves over the region during Wednesday and Thursday.
A weak low forms to the northwest on Thursday ahead of an upper level trough, the slight chance of elevated convection with instability aloft.
The low lies to the south during the weekend bringing showers.
A cold frontal passage is likely on Monday bringing showers, possible thunderstorms.
The rest of Monday September 21:
City:
Possible showers.
Chance of any rain:30%
Perth Metropolitan Area:
Mostly cloudy.A slight (30%) chance of showers.Winds southwesterly at 15-25 km/h becoming light at night.
Tuesday September 22:
City:
11-21 Degrees Celsius
AM showers.
Chance of any rain:70%
Amount:0 to 2 mm
Perth Metropolitan Area:
Partly cloudy.A high (70%) chance of showers clearing by afternoon.Light winds tending south-southwesterly at 10-20 km/h in the afternoon.
Wednesday September 23:
City:
8-26 Degrees Celsius
Sunny.
Chance of any rain:0%
Amount:Nil
Perth Metropolitan Area:
Sunny.Winds easterly at 5-15 km/h becoming northeasterly from late morning tending southerly at 15-25 km/h in the afternoon becoming southeasterly at 10-20 km/h from evening.
Thursday September 24:
City:
13-29 Degrees Celsius
Partly cloudy.
Chance of any rain:10%
Amount:Nil
Perth Metropolitan Area:
Partly cloudy.The slight chance of a shower or thunderstorm from afternoon.Winds easterly at 20-35 km/h becoming light from evening.
Friday September 25:
City:
13-24 Degrees Celsius
Shower or two.
Chance of any rain:50%
Amount:0 to 3 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A medium(50%) chance of showers.The chance of a thunderstorm.Winds west-northwesterly at 15-25 km/h.
Saturday September 26:
City:
13-21 Degrees Celsius
Showers.
Chance of any rain:80%
Amount:2 to 5 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A high(80%) chance of showers.The chance of a thunderstorm.Winds west-northwesterly at 15-30 km/h.
Sunday September 27:
City:
12-21 Degrees Celsius
Shower or two.
Chance of any rain:50%
Amount:0 to 2 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A medium(50%) chance of showers.Winds west-northwesterly at 15-25 km/h.
Monday September 28:
City:
12-20 Degrees Celsius
Showers.
Chance of any rain:80%
Amount:4 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 20-30 km/h.
Charts:
Figure 1.Surface synoptic chart at 12 UTC(8 PM local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).
Figure 2.Key features identified on True Colour RGB satellite image at around 06:00 UTC(2 PM local time yesterday).Satellite image courtesy of the Japanese Meteorological Agency(JMA).
local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).
Figure 4:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).
