Explanatory notes:
Scroll down below this section for forecast.
Figure 3.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image at 18 UTC(2 AM local time today).Image courtesy of the Australian Bureau of Meteorology(BOM).
Marine layer clouds lied over the region on Sudnay.The west coast trough lied inland having resulted in mild conditions.
Areas of fog occurred on Sunday morning over the hills and foothills with radiational cooling of the moist marine layer overnight.
Forecast updated based on latest observations with cloud cover suppressing radiational cooling.
The marine layer remains over the region until it erodes a little this afternoon.
Today with the west coast trough inland,southerly pressure gradient "bends" with solar heating leading to strong sea breezes during the afternoon and evening.Wind gusts up to 60 km/h in the afternoon and evening.Some clouds in the morning and early afternoon with the moist marine layer,clearing thereafter as the marine layer erodes a little.
Clouds return during the early hours of Tuesday with a layer of very high relative humidity at around the 900 hPa level.
Currently it looks like somewhat east-southeasterly pressure gradient from Tuesday,sea breezes in the afternoon and evening though not as strong as on Monday with weaker pressure gradients.The west coast trough remains inland.
With a more eastern track of what would be Ex Tropical Cyclone Kelvin than previously expected,little to no clouds are expected on Wednesday and Friday,with only a little cloud possible on Thursday.
Some uncertainty on the precise synoptic conditions late next week.It is likely that the west coast trough will deepen near the west coast resulting in warm air advection.However,how hot the air mass will be is limited by moist air over the northwest of the state caused by Tropical Cyclone Kelvin.
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.
Monday February 19:
City:
20-28 Degrees Celsius
Clouds decreasing.Windy between afternoon to early night.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Partly to mostly cloudy becoming sunny from mid afternoon.Winds south-southwesterly at 15-25 km/h becoming south-southwesterly at 30-45 km/h between afternoon to early night becoming south-southeasterly at 20-30 km/h at night.Wind gusts up to 60 km/h in the afternoon and evening.
Perth metropolitan area:
Tuesday February 20:
City:
16-30 Degrees Celsius
AM clouds.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Partly cloudy becoming sunny by afternoon.Winds south to southeasterly at 15-30 km/h tending south-southwesterly at 20-30 km/h in the afternoon and evening except over the hills.
Perth metropolitan area:
Wednesday February 21:
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 becoming southwesterly at 15-25 km/h in the afternoon and evening becoming light at night.
Thursday February 22:
18-31 Degrees Celsius
Perth metropolitan area:
Thursday February 22:
City:
Mostly sunny.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Mostly sunny.Light winds becoming south-southwesterly at 15-25 km/h from afternoon easing to 10-20 km/h at night.
Friday February 23:
Perth metropolitan area:
Friday February 23:
City:
19-31 Degrees Celsius
Mostly sunny.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Partly cloudy.Winds southeasterly to southwesterly at 20-30 km/h.
Saturday February 24:
Perth metropolitan area:
Saturday February 24:
City:
18-33 Degrees Celsius
Partly cloudy.
Chance of any rain:0%
Rainfall amount:0 mm.
Perth metropolitan area:
Partly cloudy.Winds easterly at 15-25 km/h.
Sunday February 25:
Perth metropolitan area:
Sunday February 25:
City:
21-32 Degrees Celsius
Partly cloudy.
Chance of any rain:10%
Rainfall amount:0 mm.
Perth metropolitan area:
Partly cloudy.Winds east-northeasterly at 20-30 km/h becoming westerly at 15-25 km/h becoming light at night.
Forecast for today produced at 4:20 AM,forecast for the rest of the days produced at 6:30 PM Sunday February 18.Weather icons courtesy of the US National Weather Service.
