Effective as of 4:00 PM Tuesday April 27 2021
Explanatory notes:
The Perth and Peel Region lockdown has been lifted, however some restrictions remain. Follow the latest update at https://www.facebook.com/MarkMcGowanMP .
Warm afternoons until Thursday afternoon with the warm air mass over the region but cool to cold mornings given the lengthening nights as the season progresses.
High and middle level clouds at times streaming in the subtropical jet stream with embedded weak upper level troughs and the broad longwave trough to the west.
The marine layer affected inland this afternoon, the possibility of fog early on Wednesday, most likely to the south with slightly drier air advecting from the east.
Possible smoke haze at times until early on Thursday with prescribed burning activities.
A significant cold front will move over the region late on Thursday with a cold air mass over the region thereafter bringing further showers, showers likely clearing by afternoon on Friday with the high pressure ridge building to the south.There is the possibility of thunderstorms with the cold frontal passage with moist and unstable air ahead of the front.
A complex scenario towards the end of the forecast period with an upper level trough likely approaching from the west leading to possible rain, showers and thunderstorms but still plenty of uncertainty on the details this far out.
.
Chance of any rain:5%
Perth Metropolitan Area:
Partly cloudy.Winds south-southwesterly at 10-20 km/h during the afternoon becoming southeasterly at night.
Partly cloudy.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.Light winds tending south-southwesterly at 10-20 km/h during the afternoon becoming southeasterly at night.
PM showers.
Chance of any rain:90%
Amount:5 to 15 mm
Perth Metropolitan Area:
Partly cloudy then a high (70%) chance of showers from afternoon with the chance of a thunderstorm.Light winds becoming west-northwesterly at 10-20 km/h from late morning increasing to 20-30 km/h in the evening and shifting west-southwesterly later at night.