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Complex frontal system about to drench the WA coast, again
Craig McIntosh, Sunday July 1, 2018 - 12:51 AEST
A moisture-laden frontal system is approaching the WA coast, bringing another round of heavy rain alongside strong winds.
A cold front, low and trough currently traversing the Indian and Southern oceans will arrive at the WA coast overnight, and this front is soaking up a lot of moisture on its journey. By midnight Tuesday, some parts of the coast between Denham and Albany may have collected well over 50mm in the rain gauge.
The front is just another in a run of fronts that has brought welcome rain totals to southwestern Australia. In June, Perth and many cities and towns in the the Central West, Lower West, South West, Southern Coastal, Great Southern, Central Wheatbelt and Gascoyne received more than their average June rainfall thanks to cold fronts.
The initial frontal boundary looks to be so wet that it will be hard for thunderstorms to form, lacking the upper level dry air that is needed for ice to bounce around and electrically charge. However, it is a complex system and as the associated low moves near the south on Tuesday, it will bring an upper cool pool of air with it and increase the risk of thunderstorms across the south.
The system as a whole is expected to generate powerful winds as it crosses southern WA. Damaging gusts greater than 90km/h are a high risk from very late Sunday all the way through to Thursday.
By Thursday, as the system has moved away to the east, parts of southwestern WA may have picked up 60-90mm of rain. Some of this will fall as heavy rain and showers, possibly leading to flash flooding. Be sure to keep an eye out for severe weather warnings at http://www.weatherzone.com.au/warnings.jsp
- Weatherzone
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2018
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