Forecast issued at 4:30 pm CDT on Thursday 21 January 2021.
A high pressure system centred over the Tasman Sea will move slowly eastwards. Another weaker high will develop over the Bight on Friday then will move eastwards and weaken late Friday and Saturday. A complex low pressure trough will develop near the western border during Saturday then move eastwards across the south during Sunday and Monday, then across the north of SA during the middle of next week.
Dry. A warm evening in the south grading to hot in the north. Generally light winds in the north. Moderate southwest to southeasterly winds.
Dry, apart from areas of morning fog over Kangaroo Island, southern Fleurieu Peninsula, the southwest of the Murraylands and the South East districts. Possible afternoon thunderstorms near the western border. Mild to warm near southern coasts, grading to very hot in the northern agricultural area, West Coast and pastoral districts. Light to moderate southeast to northeasterly winds, tending moderate to fresh southwest to southeasterly in the south.
Dry, apart from areas of morning fog over Kangaroo Island, southern Fleurieu Peninsula, the southwest of the Murraylands and the South East districts and the slight chance of a late shower and possible thunderstorms about the Nullarbor Plain. Warm to hot day about southern coasts, hot to very hot elsewhere. Light to moderate southeast to northeasterly winds and coastal sea breezes. Moderate to fresh northerly winds in the far west, shifting moderate southwesterly in the evening.
A slight chance of showers in the far west, more likely in the far northwest with possible thunderstorms. Very hot throughout with freshening northeast to northwesterly winds, turning moderate southwest to southeasterly near the coasts later.
A medium to high chance of showers extending across the west and south, grading to a slight chance over the northeast but remaining dry over the far northeast. Possible thunderstorms over most districts, apart from the far northeast and most of the agricultural area. Very hot in the east, grading to warm in the west. Moderate to fresh northeast to northwesterly winds shifting south to southwesterly in the south. Cumulative rainfall totals until midnight Monday are expected to be 1 to 5 mm, reaching 5 to 25 mm about the North West Pastoral district, although generally less than 1 mm is expected over the North East Pastoral district.
Showers extending across the State, as a milder, moderate to fresh southerly change extends throughout. Possible thunderstorms in the north and west.
The next routine forecast will be issued at 5:30 am CDT Friday.