Effective as of 4:00 PM Saturday May 1 2021
Explanatory notes:
This morning where minimum temperatures reached 8.2°C at Perth Metro was the coldest morning since the coldest summer morning on record on December 1st 2020 where minimum temperatures reached 6.6°C.
Fine conditions until Monday night with the subtropical high pressure ridge to the south but cold morning on Sunday with radiational cooling of the cold air mass with light winds and mostly clear skies.Light easterlies during the early hours and morning followed by afternoon sea breezes.
On Monday, easterly gradient flow strengthens with a west coast trough deepening near the west coast, likely suppressing the sea breeze.
Some showers and thunderstorms are expected on Tuesday associated with an upper level low and associated developing surface low. Some uncertainty on the details this far out in time, once the upper level low and associated cold pool moves to the east, thunderstorm chances diminishes but further showers are likely to continue in the moist onshore flow.
Another upper level trough potentially arrives from the west on Thursday but still some uncertainty this far out.
.
The rest of Saturday May 1:
City:
Mostly clear.
Chance of any rain:0%
Perth Metropolitan Area:
Mostly clear.Winds south-southwesterly at 10-20 km/h becoming southeasterly at night.
Sunday May 2:
City:
8-23 Degrees Celsius
Mostly sunny.
Chance of any rain:5%
Amount:Nil
Perth Metropolitan Area:
Mostly sunny.Light winds tending south-southwesterly at 15-25 km/h in the afternoon becoming southeasterly at night.
Monday May 3:
City:
11-25 Degrees Celsius
Partly cloudy.
Chance of any rain:10%
Amount:Nil
Perth Metropolitan Area:
Partly cloudy.Winds east-southeasterly at 15-25 km/h becoming easterly at 20-30 km/h in the morning easing to 15-25 km/h in the late afternoon.
Tuesday May 4:
City:
15-23 Degrees Celsius
Showers and thunderstorms.
Chance of any rain:90%
Amount:4 to 15 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A very hig (90%) chance of showers and thunderstorms.Winds northeasterly at 20-30 km/h becoming north-northeasterly at 10-25 km/h at night.
Wednesday May 5:
City:
14-23 Degrees Celsius
Showers.
Chance of any rain:90%
Amount:2 to 8 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A very high(90%) chance of showers.The chance of a thunderstorm early.Winds north-northwesterly at 15-25 km/h becoming west-northwesterly by around the middle of the day becoming west-southwesterly at nighyt.
Thursday May 6:
City:
13-21 Degrees Celsius
Showers.
Chance of any rain:80%
Amount:2 to 6 mm
Perth Metropolitan Area:
Partly to mostly cloudy.A high(80%) chance of showers.The chance of a thunderstorm.Light winds.
Friday May 7:
City:
12-21 Degrees Celsius
Possible shower.
Chance of any rain:30%
Amount:0 to 1 mm
Perth Metropolitan Area:
Partly cloudy.A slight(30%) chance of showers.Winds southerly at 15-25 km/h.