Effective as of 12:00 AM Monday December 6 2021
View the latest severe weather warnings from BOM at http://www.bom.gov.au/wa/warnings/ .
Explanatory notes:
Easterly gradient strengthens today confining the sea breeze near the coast as a southerly, if it develops.
The strong easterly gradient combined with the katabatic effect leads to strengthening east-southearlies from tonight with gusts in excess of 80 km/h possible over the hills and foothills from later tonight until Tuesday 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 on Tuesday night once vertical mixing decreases, continuing until early on Wednesday
The sea breeze will likely be suppressed on Tuesday and Wednesday with the west coast trough offshore, becoming very hot with hot air advection as the west coast trough deepens offshore.
Wednesday could be even hotter than currently forecast 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 as the marine layer advects onshore. Maximum temperatures depend on how early the west coast trough moves inland.
The slight possibility of showers in the onshore flow on Friday and Saturday with a low pressure system to the south of the state.
Monday December 6:
City:
16-33 Degrees Celsius
Sunny.
Chance of any rain:0%
Amount:Nil
Perth Metropolitan Area:
Sunny.Winds east-southeasterly at 15-25 km/h tending southerly at 20-30 km/h near the coast in the afternoon becoming east-southeasterly at 25-40 km/h at night.Gusts in excess of 80 km/h possible over the hills and foothills later at night.
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:
22-38 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.Strong gusts over the hills and foothills early.
Thursday December 9:
City:
22-33 Degrees Celsius
Mostly sunny.
Chance of any rain:5%
Amount:Nil
Perth Metropolitan Area:
Mostly sunny.Winds northeasterly at 20-30 km/h shifting west-northwesterly by around the middle of the day shfting west-southwesterly at 10-20 km/h by evening.
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 tending 20-30 km/h during the day.
Saturday December 11:
City:
17-24 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 south-southwesterlyat 15-25 km/h.
Sunday December 12:
City: