Explanatory notes:
Scroll down below this section for forecast.
Figure 3.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image at 12 UTC(8 PM local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).
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Plenty of high clouds affected the region today ahead of an upper/middle level trough/disturbance and streaming in a subtropical jet stream and from evening there were also some middle level clouds and virga which failed to reach the ground.
The west coast trough lied offshore today leading to some warm air advection and continues to do so tomorrow.
Plenty of middle and high level clouds tomorrow as well especially in the morning,with plenty of virga expected,slight chance of reaching the ground.It will be a hot day though some uncertainty on how hot it will be as it depends on cloud cover,with little cloud cover maximum temperatures could rise above 37 Degrees Celsius with 850 hPa temperatures of around 20 Degrees Celsius.
The west coast trough likely moves inland on Thursday with the marine layer advecting inland.
Plenty of uncertainty on the precise synoptic conditions late during the week as it depends on the movement of Tropical Cyclone Marcus but an easterly pressure gradient is likely.A rain band is possible and the remnant low possibly brings showers to the region early next week.
Plenty of high clouds affected the region today ahead of an upper/middle level trough/disturbance and streaming in a subtropical jet stream and from evening there were also some middle level clouds and virga which failed to reach the ground.
The west coast trough lied offshore today leading to some warm air advection and continues to do so tomorrow.
Plenty of middle and high level clouds tomorrow as well especially in the morning,with plenty of virga expected,slight chance of reaching the ground.It will be a hot day though some uncertainty on how hot it will be as it depends on cloud cover,with little cloud cover maximum temperatures could rise above 37 Degrees Celsius with 850 hPa temperatures of around 20 Degrees Celsius.
The west coast trough likely moves inland on Thursday with the marine layer advecting inland.
Plenty of uncertainty on the precise synoptic conditions late during the week as it depends on the movement of Tropical Cyclone Marcus but an easterly pressure gradient is likely.A rain band is possible and the remnant low possibly brings showers to the region early next week.
The rest of Tuesday March 20:
Perth metropolitan area:
City:
Cloudy.
Chance of any rain:5%
Amount:0 mm.
Perth metropolitan area:
Cloudy,high clouds.Winds east-southeasterly at 5-15 km/h increasing to 15-25 km/h at night.
Wednesday March 21:
Perth metropolitan area:
Wednesday March 21:
City:
24-36 Degrees Celsius
Clouds decreasing.
Chance of any rain:20%
Amount:0 mm.
Perth metropolitan area:
Cloudy in the morning clearing to a mostly sunny afternoon.A slight(20%) chance of a shower or thunderstorm in the morning.Winds east-northeasterly at 15-30 km/h becoming northeasterly from late morning becoming light from late afternoon becoming easterly at 10-20 km/h at night.
Thursday March 22:
Perth metropolitan area:
Thursday March 22:
City:
21-29 Degrees Celsius
Sunny day.
Chance of any rain:0%
Amount:0 mm.
Perth metropolitan area:
High clouds,partly cloudy during the predawn hours,a sunny day.Winds northeasterly at 10-20 km/h becoming northerly before dawn becoming southwesterly at 15-25 km/h during the day becoming south-southwesterly at 10-20 km/h at night.
Friday March 23:
Perth metropolitan area:
Friday March 23:
City:
17-30 Degrees Celsius
Partly cloudy.
Chance of any rain:10%
Amount:0 mm.
Perth metropolitan area:
Partly cloudy.Winds south-southeasterly at 10-20 km/h becoming south-southwesterly at 20-30 km/h from afternoon becoming southeasterly at 10-20 km/h at night.
Saturday March 24:
Perth metropolitan area:
Saturday March 24:
City:
18-27 Degrees Celsius
Possible rain.
Chance of any rain:30%
Amount:0 to 1 mm.
Perth metropolitan area:
Mostly cloudy,high clouds.A slight(30%) chance of rain.Winds east-southeasterly at 15-25 km/h.
Sunday March 25:
Perth metropolitan area:
Sunday March 25:
City:
17-29 Degrees Celsius
Mostly cloudy.
Chance of any rain:20%
Amount:0 mm.
Perth metropolitan area:
Mostly cloudy.A slight(20%) chance of a shower.Winds easterly at 20-30 km/h.
Monday March 26:
Perth metropolitan area:
Monday March 26:
City:
20-27 Degrees Celsius
Shower or two.
Chance of any rain:50%
Amount:0 to 2 mm.
Perth metropolitan area:
Mostly cloudy.A medium(50%) chance of showers.Winds northeasterly at 15-30 km/h shifting westerly during the day becoming south-southwesterly at 15-25 km/h at night.
Tuesday March 27:
Perth metropolitan area:
Tuesday March 27:
City:
17-24 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 south-southwesterly at 15-30 km/h.
Forecast produced at 6:00 PM Tuesday March 20.Weather icons courtesy of the US National Weather Service.
