Issued Monday 7th August 2017. After above average rainfall in July and waterspouts crossing the coast as tornados causing damage, Perth and South West WA are in for 2 more rounds of wild weather this week! Above image 7 day total rainfall forecast via GFS / BSCH.
Significant rain is forecast across the South West again this week with widespread totals of 50 to 100mm possibly higher along the coast.
On Tuesday a trough will develop in the morning from Perth to Albany producing a band of scattered showers and rain. A strong cold front will then cross the coast South from Geraldton on Tuesday afternoon producing scattered showers, isolated storms and rain areas with moderate to locally heavy falls possible. Strong to possibly damaging winds of 60 – 80 km/h are also forecast with a slight chance of waterspouts crossing the coast as weak tornados. This trough pushes East across the South West land areas during Tuesday night to reach Esperance by early morning.
A very cold cored upper low with vigorous South West wind flow then crosses the South West (Gelaldton to Albany) on Wednesday producing scattered showers, isolated storms with small hail and rain areas with moderate to locally heavy falls possible. Very strong to possibly damaging wind gusts to 90 km/h developing across the entire Southern half of the state during Wednesday with dust storms possible inland. Waterspouts crossing the coast as weak tornados are also an increased risk along the South West Coast. Snow falls are likely on Bluff Knoll and the Mt Stirling Ranges during Wednesday and Wednesday night. Below image shows the -30C cold pool @ 18,000ft crossing the South West on Wednesday.
Above image showing widespread damaging winds developing across the Southern half of the state late Wednesday. [wp_ad_camp_4]
Conditions are expected to ease on Thursday. Widespread morning frosts developing on Thursday and Friday through the Central and Southern inland.
Another cold front stronger than the first one is forecast to hit the South West (Gelaldton to Albany) over night Friday into Saturday. Damaging to Destructive winds likely with an increased risk of waterspouts crossing the coast as tornados. Scattered showers and rain areas with moderate to locally heavy falls possible. Below image showing winds gusts on Saturday night via Windy.
During Sunday the wet weather and strong winds are expected to continue across the South West.