Forecast issued at 4:30 pm CDT on Thursday 27 October 2016.
A high pressure system south of Kangaroo Island will move east to be over the Tasman sea on Friday. A trough of low pressure will move across western parts of the State on Saturday and then remaining parts on Sunday, followed by a ridge of high pressure developing over the Bight during Sunday and Monday.
Forecast for the rest of Thursday
Fine. Cool grading to mild in the north. Light to moderate south to southeasterly winds.
Friday 28 October
Cool to cold at first in the east with early morning frost patches. A slight chance of showers in the far northwest. Mild in the south, grading to warm in the north and west with light to moderate southeast to northeasterly winds.
Saturday 29 October
Temperatures rising, becoming warm to hot throughout. Northeast to northwesterly winds increasing to fresh to strong and gusty from the west, ahead of a cooler, fresh to strong southwest to southerly change in the west during the afternoon or evening. The slight chance of showers and possible thunderstorms developing in the west in the afternoon or evening, with the slight chance of showers extending to southern coasts in the evening, with showers increasing to a medium chance near western coasts.
Sunday 30 October
The slight to medium chance of showers over most districts, increasing further south to be a medium to high chance over the agricultural area, and a high to very high chance in the Lower South East and about southern coasts and ranges. Possible early morning thunderstorms over the agricultural area and south of the North West Pastoral. Possible thunderstorms re-developing in the Lower South East in the afternoon with the chance of small hail. Showers easing and contracting to the far north and agricultural area in the afternoon or evening. Warm to hot in the east with moderate to fresh northeast to northwesterly winds, ahead of a colder, fresh to strong southwest to southerly change in the west early morning, extending throughout during the day.
Monday 31 October
The slight to medium chance of showers over the southern agricultural area, increasing to a medium to high chance near southern coasts. The slight chance of showers near the northern border. Cool in the south with moderate to fresh northwest to southwesterly winds, grading to mild in the north with winds turning light to moderate southwest to southeasterly. Cumulative rainfall totals until midnight Monday are to be less than 2 mm, increasing to 2 to 5 mm over the agricultural area, with 5 to 15 mm possible near southern coasts and ranges and in the Lower South East. The majority of this rainfall is expected overnight Saturday, Sunday and on Monday.
Tuesday until Thursday
A slight to medium chance of showers over the agricultural area, contracting south on Wednesday and clearing by Thursday. A slight to medium chance of showers also developing in the far northwest on Tuesday, extending over northern parts of the State on Wednesday and Thursday. Cool to mild in the south grading to warm in the north.
The next routine forecast will be issued at 5:30 am CDT Friday.