A high in the Tasman Sea directs a southwesterly airflow over New Zealand today. A northerly airflow increases on Tuesday ahead of a deep intense low which moves over the South Island later in the day, the flow changes to the southwest on Wednesday.

Monday

No major points regarding the weather today, an isolated shower or two may pop up for eastern parts of the country this afternoon. Mainly for inland areas then clearing in the evening.

Blue – Heavy rain moves onto the West Coast of the South Island from late afternoon or evening. Rain may become torrential then easing overnight. Rain may be heavy for a time about Southland and Central Otago overnight also.

Purple – Northerlies strengthen over many parts of the South Island especially from late afternoon or evening where winds may rise to gale especially about the upper South Island and through Cook Strait.

Yellow – Temperatures reaching into the low to mid twenties in the afternoon for the eastern North Island.