One Association - Many Values

21/05/2010 - Widespread rain is forecast across Perth

WIDESPREAD rain is forecast across Perth and much of the southern half of Western Australia throughout Friday and Saturday.  The Weather Bureau is forecasting showers will develop in the Perth metropolitan area from late morning, increasing in the afternoon and tonight.  According to Bureau of Meteorology modelling, falls from 1mm to 10mm can be expected around Perth and the west coast today, with much heavier falls - from 10mm  to 50mm -- over much of the southern half of WA.



By 2pm, Champion Lakes, south-east of the city, had 6.4mm and Swanbourne 5mm, but the rain had largely bypassed the city.  Rain started falling at Rottnest about 9am and the island recorded 1.8mm, while Pearce to the east of the city had 2.6mm. Perth Airport has had 1.8m but just 0.6mm had been recorded in the city. Jandakot had 2.4mm, but rain is expected to increase later in the day.  In the far South-West, Cape Naturaliste had recorded 6.6mm.

Saturday is also going to be wet, with scattered showers and isolated thunderstorms predicted, with generally moderate falls expected. Some heavier falls are possible in the west and south of the state.

Gale wind warning for southern coast

A Coastal Waters wind warning has been issued from Coral Bay in the north of the state to Bremer Bay in the south, with a Gale Wind warning from Mandurah to Bremer Bay, with winds expected to increase to 30 to 40 knots late Saturday afternoon and evening with possible squalls to 50knots.

Agricultural areas desperate for season break.  If the rain does penetrate the agricultural areas it will be a much-needed break to the grain growing season with farmers across the state desperate for a good opening rain.  Before today Perth has had just 23mm this month, well short of the May average of 117.7mm on about 12 days.  Last May, Perth  recorded 46mm on four days.

Perth has had 88.6mm this year, falling on 12 days. The average for the five months (January to May) is 203.6mm on about 27 days.  Early on Saturday the low pressure system will lie near the southwest corner of the state and move southeast during the day to lie south of Esperance by Saturday night.

Scattered showers and isolated thunderstorms should extend through the South West during Saturday morning and north to the southern Gascoyne and inland to the South West Goldfields during the day.  Moderate falls should reach most parts, with some heavier falls possible, especially in western and southern
parts.

Perth Forecast for Friday


Cloudy with a shower or two developing late morning then increasing during the
afternoon and evening. Moderate to fresh north-east winds tending moderate N/NW in the
afternoon.

Precis: Showers developing.

City: Max 23
Mandurah: Max 23

The week ahead

Saturday:  Showers, possible thunderstorm. Min 13 Max 19
Sunday:    Chance of a shower. Min 9 Max 20
Monday:    Partly cloudy. Min 7 Max 20
Tuesday:  Chance of a shower. Min 8 Max 21
Wednesday: Shower or two. Min 9 Max 20
Thursday: Chance of a shower. Min 9 Max 20

 South-West forecast

Isolated showers over the northern parts extending throughout during the day. Showers tending scattered over the Lower West and Southwest districts and western parts of the Central Wheat Belt and Great Southern in the afternoon,with isolated thunderstorms in the evening.