Explanatory notes:
Scroll down below this section for forecast.
Figure 3.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image at 06 UTC(2 PM local time today).Image courtesy of the Australian Bureau of Meteorology(BOM).
The west coast trough moved inland this afternoon with the marine layer advecting over the region,moist low level air overnight leads to the possibility of marine layer clouds overnight,predicted by ACCESS model but not other models.
Likely hot conditions on Thursday with the west coast trough deepening down the west coast with warm air advection.
Maximum temperature forecast for Friday has been downgraded and may be further downgraded as the west coast trough is now expected to move inland in the morning as opposed to in the afternoon resulting in early sea breezes.
There is also the slight chance of diurnal convection with sea breeze convergence on Friday with some atmospheric instability possible with relatively steep vertical steep lapse rates but still plenty of uncertainty.
Some uncertainty on the precise synoptic conditions during the weekend but it will be cooler than Thursday and Friday.
The long spell with no 40+ Degree Days continues with the last 40+ Degree Day being Australia Day last year!With no 40+ Degree day within the forecast period,the next 40+ Degree Day will be at least the latest during summer as the 2005-2006 summer.
The rest of Monday February 12:
City:
Clear.
Chance of any rain:0%
Perth metropolitan area:
Clear.Winds southwesterly at 15-25 km/h.
Tuesday February 13:
City:
16-26 Degrees Celsius
Becoming sunny.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Mostly sunny becoming sunny by around the middle of the day.Winds southerly at 15-25 km/h tending southwesterly at 20-35 km/h between around the middle of the day and evening.
Wednesday February 14:
City:
17-31 Degrees Celsius
Sunny.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Sunny.Winds east-southeasterly at 10-20 km/h becoming southwesterly at 20-30 km/h from afternoon becoming south-southeasterly at 15-25 km/h.
Thursday February 15:
City:
20-37 Degrees Celsius
Hot and sunny.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Hot and sunny.Winds easterly at 20-30 km/h becoming south-southwesterly at 15-25 km/h from afternoon becoming south-southeasterly at 10-20 km/h at night becoming east-southeasterly at 20-30 km/h.Maximum temperatures range from around 40 Degrees Celsius over inland coastal plain to around 33 Degrees Celsius over coastal areas,around 37 Degrees Celsius about the city centre.
Friday February 16:
City:
24-35 Degrees Celsius
Some high clouds(mostly sunny).
Chance of any rain:5%
Rainfall amount:0 mm.
Perth metropolitan area:
Some high clouds(mostly sunny).A slight(20%) chance of a shower or thunderstorm in the afternoon over the hills,a near zero chance elsewhere.Light winds becoming west-southwesterly at 15-25 km/h from around the middle of the day becoming light at night.
Perth metropolitan area:
Saturday February 17:
City:
19-30 Degrees Celsius
Mostly sunny.
Chance of any rain:5%
Rainfall amount:0 mm.
Perth metropolitan area:
Mostly sunny.Light winds becoming southwesterly at 15-25 km/h becoming south-southwesterly at night.
Perth metropolitan area:
Sunday February 18:
City:
18-31 Degrees Celsius
Sunny.
Chance of any rain:5%
Rainfall amount:0 mm.
Perth metropolitan area:
Sunny.Light winds becoming southwesterly at 20-30 km/h becoming south-southwesterly at night.
Perth metropolitan area:
Monday February 19:
City:
19-31 Degrees Celsius
Sunny.
Chance of any rain:5%
Rainfall amount:0 mm.
Perth metropolitan area:
Sunny.Winds southeasterly at 10-20 km/h becoming south-southwesterly at 20-35 km/h from around the middle of the day.
Forecast produced at 7:00 PM Monday February 12.Weather icons courtesy of the US National Weather Service.
