Daily 6

Weather forecast for Perth effective as of 12:00 AM Wednesday May 23
Explanatory notes:
Scroll down below this section for forecast. 

Figure 1.Surface synoptic chart at 12 UTC(8 PM local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).

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).

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).

Figure 4:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).

Unusually warm weather tomorrow with a warm air mass over the region.

At night a strong cold front moves across the region ending the warm dry spell.

The cold front will likely be accompanied by thunderstorms with 1000 J/kg CAPE ahead of the front in the evening predicted by the ECMWF model.With very strong winds aloft(120+ km/h at 850 hPa level),damaging winds are possible with thunderstorms,even the chance of tornadoes and waterspouts with high vertical wind shear.

On Friday deep cold air mass lies over the region with 500 hPa temps down to -24 Degrees Celsius,leading to the possibility of small hail and thunderstorms most likely in the south.

On Saturday remnant post cold frontal showers easing.

On Sunday another,but much weaker cold front brushes the region bringing showers again.

Improving conditions from Monday with a high pressure system strengthening to the southeast.

The rest of Wednesday May 23:

City:

Clear night.

Chance of any rain:0%

Perth metropolitan area:

Partly cloudy,high clouds clearing by night.Light winds.

Thursday May 24:

City:

11-28 Degrees Celsius

Late windy with showers and thunderstorms,possibly heavy.

Chance of any rain:100%

Amount:10 to 30 mm.
Severe weather warning in effect!See note!

Perth metropolitan area:

Partly cloudy,high clouds.A very high(100%) chance of showers and thunderstorms from evening.Heavy rainfall and damaging winds possible with thunderstorms.Winds north-northeasterly at 25-40 km/h becoming north-northwesterly from afternoon increasing to 30-50 km/h in the evening becoming west-northwesterly late at night.Wind gusts in excess of 90 km/h possible at night.

Friday May 25:

City:

13-18 Degrees Celsius

Windy with showers.Possible thunderstorms.

Chance of any rain:100%

Amount:10 to 25 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(100%) chance of showers easing from afternoon.The chance of thunderstorms and/or small hail most likely in the south.Winds west-southwesterly at 30-45 km/h easing to 20-30 km/h at night.Gusts in excess of 70 km/h possible.

Saturday May 26:

City:

12-20 Degrees Celsius

Showers.

Chance of any rain:80%

Amount:0.4 to 2 mm.

Perth metropolitan area:

Partly to mostly cloudy.A high(80%) chance of showers.Winds west-southwesterly at 20-30 km/h easing to 10-20 km/h at night.

Sunday May 27:

City:

13-21 Degrees Celsius

Showers.

Chance of any rain:90%

Amount:2 to 8 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(90%) chance of showers.Winds westerly at 20-30 km/h.

Monday May 28:

City:

12-21 Degrees Celsius

Possible shower or two.

Chance of any rain:40%

Amount:0 to 1 mm.

Perth metropolitan area:

Partly to mostly cloudy.A medium(40%) chance of showers.Winds west-southwesterly at 15-25 km/h.

Tuesday May 29:

City:

7-21 Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Mostly sunny.Winds east-northeasterly at 10-20 km/h.

Wednesday May 30:

City:

8-23 Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:0 mm.

Perth metropolitan area:

Sunny.Winds northeasterly at 15-25 km/h.

Forecast for today produced at 11:45 PM Monday May 7,forecast for the rest of the days produced at 5:00 PM Monday May 7.Weather icons courtesy of the US National Weather Service.