Effective as of 12:00 AM Tuesday December 7 2021
View the latest severe weather warnings from BOM at http://www.bom.gov.au/wa/warnings/ .
Explanatory notes:
The strong easterly gradient combined with the katabatic effect leads to strong east-southeasterlies with gusts in excess of 80 km/h possible over the hills and foothills until morning, winds easing slightly by late morning as the land heats up, with increased vertical mixing, strong gusts again likely over the hills and foothills again tonight once vertical mixing decreases, continuing until early on Wednesday
The sea breeze will likely be suppressed until Wednesday with the west coast trough offshore, very hot with hot air advection as the west coast trough deepens offshore.
Wednesday could reach 40°C if skies are sufficiently clear. Currently the slight possibility of elevated convection, most likely during the early hours and morning ahead of an upper level trough.
The west coast trough likely moves inland on Thursday bringing cooler but humid conditions once the marine layer advects onshore. Maximum temperatures depend on how early the west coast trough moves inland. A later arrival of the onshore flow would lead to another very hot day,
The slight possibility of showers in the onshore flow on Friday and Saturday with a low pressure system to the south of the state.
Tuesday December 7:
City:
16-37 Degrees Celsius
Hot and sunny.
Chance of any rain:10%
Amount:Nil
Perth Metropolitan Area:
Hot and sunny.Winds easterly at 25-40 km/h easing to 15-25 km/h in the afternoon increasing to 20-35 km/h later at night.Gusts in excess of 80 km/h possible over the hills and foothills during the early hours, morning and later at night.
Wednesday December 8:
City:
23-39 Degrees Celsius
Hot and mostly sunny.
Chance of any rain:20%
Amount:Nil
Perth Metropolitan Area:
Very hot and mostly sunny.A slight(20%) chance of showers and/or thunderstorms most likely in the early hours and morning.Winds east-northeasterly at 25-40 km/h becoming northeasterly in the morning, easing to 15-25 km/h In the afternoon, increasing to 20-30 km/h at night.Gusts in excess of 80 km/h possible over the hills and foothills early.
Thursday December 9:
City:
23-36 Degrees Celsius
Mostly sunny.
Chance of any rain:5%
Amount:Nil
Perth Metropolitan Area:
Mostly sunny.Very hot inland.Winds northeasterly at 20-30 km/h shifting westerly at 10-25 km/h by afternoon.
Friday December 10:
City:
19-25 Degrees Celsius
Partly cloudy.
Chance of any rain:20%
Amount:Nil
Perth Metropolitan Area:
Partly cloudy.A slight(20%) chance of a shower.Winds west-southwesterly at 10-20 km/h icnreasing to 20-30 km/h in the morning.
Saturday December 11:
City:
17-25 Degrees Celsius
Possible shower.
Chance of any rain:30%
Amount:0 to 0.4 mm
Perth Metropolitan Area:
Partly cloudy.A slight(30%) chance of a shower.Winds southwesterly at 15-25 km/h becoming south-southwesterly from evening.
Sunday December 12:
City: