Effective as of 4:00 AM Monday April 19 2021
Explanatory notes:
The west coast trough moved inland yesterday afternoon.
As at 4 AM, smoke from prescribed burns lies aloft, this should clear in the morning with the southerly gradient flow today.
A weak cold front and weak trough brushes the south of the state today leading to some clouds around Perth but Perth should remain dry.
Thereafter, the subtropical high pressure ridge strengthens to the south again leading to gradient flow becoming an easterly direction again. Still some stratocumulus clouds on Tuesday extending from east of the Darling Scarp with moist low level air.
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 with the warm air advection and warm air advection over the region but the decreasing solar insolation as autumn progresses is certainly having its impact.
Possible smoke haze at times mainly when the gradient flow is an easterly direction depending on prescribed burning activities.
Monday April 19:
City:
12-24 Degrees Celsius
Partly cloudy.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.Smoke aloft early.Winds southeasterly at 10-20 km/h tending south-southwesterly at 15-25 km/h in the afternoon.
Tuesday April 20:
City:
13-25 Degrees Celsius
Partly cloudy.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.Possible smoke aloft depending on prescribed burning activites.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.Possible smoke aloft 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.Winds easterly at 20-30 km/h becoming light in the afternoon.
Friday April 23:
City:
15-29 Degrees Celsius
Partly cloudy.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.Winds east-northeasterly at 15-25 km/h becoming light from afternoon.
Saturday April 24:
City:
16-31 Degrees Celsius
Partly cloudy.
Chance of any rain:0%
Amount:Nil.
Perth Metropolitan Area:
Partly cloudy.Winds northeasterly at 15-25 km/h becoming light during the afternoon.
Sunday April 25:
City:
16-31 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.
Cha
Figure 1.Surface synoptic chart at 12 UTC(8 PM local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).
2.
Figure 2.Key features identified on True Colour RGB satellite image at around 06:00 UTC(2 PM local time yesterday).Satellite image courtesy of the Japanese Meteorological Agency(JMA).
local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM)
Figure 4:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).
