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 yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).
Light winds overnight with the boundary layer expected to decouple hence I have pushed minimum temperatures down a little from the OCF forecast.
With the west coast trough inland on Thursday,sea breezes in the afternoon and evening though they will be weaker than usual with weak pressure gradients.The marine layer advects inland from afternoon.Marine layer clouds from early evening.The chance of areas of fog early on Friday.High amounts of marine layer low clouds possibly limits the potential for fog with suppressed radiational cooling.
Strengthening southeasterly pressure gradient on Friday with low clouds from the southeast possibly extending over the region.
The west coast trough deepens near the west coast during the weekend leading to some warm air advection however,moist air over the northwest of the state will limit how hot it will be.
The slight to medium chance of showers and thunderstorms over the region most likely over the hills from Saturday afternoon with an upper/middle level trough/disturbance to the west.Medium chances of showers on Sunday with a weak low possibly forming to the south.
Cooler air mass lies over the region on Monday.
A weak cold front possibly brushed the region on Tuesday but still plenty of uncertainty this far out.
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 on record during summer for the Perth Metro station or if there is no 40+ Degree Day at all this summer the first since the 2001-2002 summer.
Thursday February 22:
16-30 Degrees Celsius
Perth metropolitan area:
City:
Sunny then clouds increasing later.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Sunny becoming partly cloudy by night.Light winds becoming southwesterly at 15-25 km/h from afternoon easing to south-southwesterly at 5-15 km/h at night.
Friday February 23:
Perth metropolitan area:
Friday February 23:
City:
17-29 Degrees Celsius
Partly cloudy.
Chance of any rain:10%
Rainfall amount:0 mm.
Perth metropolitan area:
Partly cloudy.The chance of areas of fog in the early hours and morning clearing by 8 AM.Winds south-southeasterly at 10-20 km/h increasing to 20-30 km/h from afternoon becoming east-southeasterly at night.
Saturday February 24:
Perth metropolitan area:
Saturday February 24:
City:
16-32 Degrees Celsius
Possible PM shower or thunderstorm.
Chance of any rain:30%
Rainfall amount:0 to 1 mm.
Perth metropolitan area:
Partly cloudy.A medium(40%) chance of showers and/or thunderstorms from afternoon over the hills,a slight(30%) chance elsewhere.Winds easterly at 20-30 km/h becoming northeasterly from late afternoon.
Sunday February 25:
Perth metropolitan area:
Sunday February 25:
City:
20-28 Degrees Celsius
Possible showers.
Chance of any rain:40%
Rainfall amount:0 to 1 mm.
Perth metropolitan area:
Partly cloudy.A medium(40%) chance of a showers.The chance of a thunderstorms.Winds north-northwesterly at 15-25 km/h becoming west-southwesterly from afternoon becoming south-southwesterly at night.
Monday February 26:
Perth metropolitan area:
Monday February 26:
City:
16-25 Degrees Celsius
Partly cloudy.
Chance of any rain:20%
Rainfall amount:0 mm.
Perth metropolitan area:
Partly cloudy.A slight(20%) chance of showers.Winds south-southwesterly at 10-20 km/h becoming west-southwesterly at 15-25 km/h from afternoon.
Tuesday February 27:
Perth metropolitan area:
Tuesday February 27:
City:
15-25 Degrees Celsius
Possible early shower.
Chance of any rain:30%
Rainfall amount:0 to 1 mm.
Perth metropolitan area:
Partly cloudy.A slight(30%) chance of showers in the early hours and morning.Winds south-southwesterly at 20-30 km/h becoming south-southeasterly at 10-20 km/h at night.
Wednesday February 28:
Perth metropolitan area:
Wednesday February 28:
City:
15-29 Degrees Celsius
Sunny.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Sunny.Winds east-southeasterly at 15-25 km/h tending south-southwesterly at 15-25 km/h in the fternoon and evening.
Forecast for today produced at 12:00 AM,forecast for the rest of the days produced at 7:30 PM Wednesday February 21.Weather icons courtesy of the US National Weather Service.
