Effective as of 4:00 PM Tuesday April 20 2021
Explanatory notes:
As at 4 PM, stratocumulus clouds contracting east with the sea breeze front moving inland. Some smoke haze possible overnight with southeasterly gradient flow and some prescribed burns to the southeast with the nocturnal inversion once again developing, the smoke haze likely lifts from morning with winds becoming more easterly along with the dissipation of the nocturnal inversion and increased vertical mixing.
The subtropical high pressure ridge strengthens to the south leading to a somewhat easterly gradient flow from Wednesday.
The west coast trough likely deepens off the coast from Thursday with warm air advection. Another upper level trough approaches from the west leading to some high and middle level clouds but conditions are expected to be dry. Warm to hot with the warm air advection and the hot air mass over the region but the decreasing solar insolation as autumn progressing is certainly having its impact.
Possible smoke haze at times depending on prescribed burning activities, air quality and visibility reductions most likely overnight and in the mornings with the nocturnal inversion, most likely until early Thursday with the gradient flow shifting to become a more northeasterly and then northerly direction then, smoke haze still possible if there are prescribed burns to the north during the weekend.
The west coast trough likely moves inland at the end of the forecast period with the subtropical ridge lying just slightly north leading to moist onshore flow from Monday or Tuesday afternoon but still some uncertainty this far out.
The rest of Tuesday April 20:
City:
Mostly clear.
Chance of any rain:0%
Perth Metropolitan Area:
Partly cloudy.Possible smoke haze aloft depending on prescribed burning activities.Winds east-southeasterly at 10-20 km/h tending south-southwesterly at 15-30 km/h in the afternoon.
Wednesday April 21:
City:
13-26 Degrees Celsius
Mostly sunny.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Mostly sunny.High clouds.Possible smoke haze, most likely early, depending on prescribed burning activites.Winds east-southeasterly at 10-20 km/h.
Thursday April 22:
City:
13-27 Degrees Celsius
Partly cloudy.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.High clouds.Possible smoke aloft early depending on prescribed burning activites.Winds easterly at 15-25 km/h tending southeasterly in the late afternoon and evening.
Friday April 23:
City:
15-30 Degrees Celsius
Partly cloudy.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.High clouds.Winds easterly at 15-25 km/h tending southeasterly in the late afternoon and evening.
Saturday April 24:
City:
16-31 Degrees Celsius
Partly cloudy.
Chance of any rain:5%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.Winds northeasterly at 15-25 km/h becoming light during the afternoon.
Sunday April 25:
City:
14-31 Degrees Celsius
Mostly sunny.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Mostly sunny.Winds northeasterly at 15-25 km/h becoming light during the afternoon.
Monday April 26:
City:
15-31 Degrees Celsius
Partly cloudy.
Chance of any rain:5%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.Winds northeasterly at 15-25 km/h shifting northwesterly later during the day.
Tuesday April 27:
City:
16-29 Degrees Celsius
Partly cloudy.
Chance of any rain:10%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.Winds north-northwesterly at 15-25 km/h shifting west-southwesterly later during the day.
Charts:
Figure 1.Surface synoptic chart.Image courtesy of the Australian Bureau of Meteorology(BOM).
2.
Figure 2.Key features identified on True Colour RGB satellite image.Satellite image courtesy of the Japanese Meteorological Agency(JMA).
Figure 4:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).
No liabilities held from information consumed on this site. Weather icons are from the US National Weather Service.Some information on this site is from the Australian Bureau of Meteorology (BOM).
