Weather forecast for Perth effective as of 4:00 PM Tuesday July 31

Weather forecast for Perth effective as of 4:00 PM Tuesday July 31
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.The Australian Bureau of Meteorology(BOM) has issued a severe weather warning for damaging winds and damaging surf for parts of the west,southwest and south of the state including the Perth Metropolitan Area for Wednesday.Please see http://www.bom.gov.au/products/IDW21037.shtml for the latest severe weather warning.

Figure 3.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 4.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).

A strong cold front moves across the region early on Wednesday with a deep cold air mass over the region thereafter with 500 hPa temperatures down to -29 Degrees Celsius,showers,thunderstorms and possible hail.Gusty winds with showers and thunderstorms.Possibly the coldest air mass of the year so far lies over the region at night,with 850 hPa temps down to -2 Degrees Celsius.

The Australian Bureau of Meteorology(BOM) has issued a severe weather warning for damaging winds and damaging surf for parts of the west,southwest and south of the state including the Perth Metropolitan Area for Wednesday.Please see http://www.bom.gov.au/products/IDW21037.shtml for the latest severe weather warning.

Cold southwesterly air steam on Thursday and Friday leads to further showers.

Another cold front likely moves across the region late on Friday.

Tuesday July 31:

City:

5-19 Degrees Celsius

Possible night shower

Chance of any rain:30%

Amount:0 to 0.4 mm.

Perth metropolitan area:

Partly cloudy day.A slight(30%) chance of showers from evening.Light winds becoming northwesterly at 15-25 km/h from around the middle of the day.

Wednesday August 1:

City:

11-16 Degrees Celsius

Windy with showers and thunderstorms.
BOM severe weather warning in effect!See note!

Chance of any rain:100%

Amount:15 to 30 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(100%) chance of showers.Thunderstorms from late morning.Possible hail from late morning.Temperatures decreasing in the afternoon.Winds northwesterly at 25-40 km/h becoming westerly at 30-45 km/h from morning becoming southwesterly from afternoon.Gusty winds,gusts in excess of 90 km/h possible.
Note:The Australian Bureau of Meteorology(BOM) has issued a severe weather warning for damaging winds and damaging surf for parts of the west,southwest and south of the state including the Perth Metropolitan Area for Wednesday.Please see http://www.bom.gov.au/products/IDW21037.shtml for the latest severe weather warning.

Thursday August 2:

City:

6-16 Degrees Celsius

Showers.Possible early thunderstorm.

Chance of any rain:100%

Amount:3 to 8 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(100%) chance of showers.The chance of thunderstorms and/or small hail in the early hours.Winds southwesterly at 25-40 km/h.

Friday August 3:

City:

11-18 Degrees Celsius

Showers.

Chance of any rain:95%

Amount:4 to 12 mm.

Perth metropolitan area:

Mostly cloudy.A very high(95%) chance of showers.Winds westerly at 25-40 km/h.

Saturday August 4:

City:

9-16 Degrees Celsius

Showers easing.

Chance of any rain:90%

Amount:2 to 8 mm.

Perth metropolitan area:

Partly to mostly cloudy.A very high(90%) chance of showers easing to a medium(60%) chance before dawn.The chance of a thunderstorm during the early hours.Winds south-southwesterly at 25-40 km/h.

Sunday August 5:

City:

7-16 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 south-southwesterly at 15-25 km/h.

Monday August 6:

City:

5-17 Degrees Celsius

Mostly cloudy.

Chance of any rain:20%

Amount:0 mm.

Perth metropolitan area:

Mostly cloudy.A slight(20%) chance of a shower.Light winds.

Tuesday August 7:

City:

8-18 Degrees Celsius

Showers.

Chance of any rain:60%

Amount:0 to 3 mm.

Perth metropolitan area:

Mostly cloudy.A medium(60%) chance of showers.Light winds.

Forecast for today produced at 12:00 AM,forecast for the rest of the days produced at 4:20 PM Wednesday July 11.Weather icons courtesy of the US National Weather Service.