Forecast issued at 5:30 am CST on Tuesday 27 September 2016.
A weak front will move over southern coasts today with a ridge of high pressure over the north of the State. A vigorous front and intense low pressure system is expected to move across the State on Wednesday and Thursday. A high pressure system will move in from the west on Friday.
Forecast for the rest of Tuesday
A slight to medium chance of showers about Kangaroo Island and the South East districts. Patchy rain about the northeastern border clearing during the day. Cool to mild with mainly light winds, tending moderate northwesterly near southern coasts.
Wednesday 28 September
Areas of rain and possible thunderstorms east of about Ceduna to Coober Pedy, extending east during the day. A slight to medium chance of showers and possible thunderstorms to follow the rain for areas south of about Coober Pedy, increasing to a high to very high chance about the southern agricultural area. Small hail possible about the West Coast and the south of the North West Pastoral. Mild to warm with freshening northerly winds ahead of a colder, fresh to strong west to southwesterly change extending throughout from the west during the day, possibly reaching gale force at times in the west.
Thursday 29 September
A slight to medium chance of showers about the West Coast, agricultural area and the south of the Pastoral districts, increasing to a high to very high chance of showers and possible thunderstorms about the southern agricultural area. Possible heavy falls, mainly about the Mount Lofty Ranges and Mid North districts. Possible small hail about the West Coast. Cool to cold with fresh to strong southwesterly winds extending throughout, possibly reaching gale force at times.
Friday 30 September
The slight to medium chance of showers about the agricultural area, mainly during the morning. Cool with moderate to fresh southwesterly winds, strong near the southeastern coasts during the morning, tending light and variable in the west. Cumulative rainfall totals until midnight Friday: 2 to 10 mm, increasing to 20 to 60 mm over the agricultural area, with some falls of 50 to 100 mm possible over the Mount Lofty Ranges and Mid North districts.
Saturday until Monday
Fine on Saturday with slight to medium chance of showers extending across most areas apart from the northwest, more likely about southern coasts and ranges. Mild to warm grading to hot in the west, with moderate northerly winds shifting milder west to southwesterly on Sunday.
The next routine forecast will be issued at 4:30 pm CST Tuesday.