The MetService has issued a heavy rain warning (orange) for the headwaters of Otago lakes and rivers.

Heavy rain is expected for the 24 hour period from 3am Wednesday until 3am Thursday with 200 to 300mm of rain about the divide, and 100 to 150mm with 15km east of the divide.

Peak rates will see 20 to 30mm/h about the divide.

The MetService said this is likely to be a significant heavy rain event . Warnings may be extended, added, or upgraded to red closer to the time.

An active front, preceded by a strong and very moist north to northwesterly flow, is forecast to move slowly northwards over the South Island from Wednesday to Friday, bringing significant heavy rain to western areas. 

The heaviest rain is expected in Westland and Buller, both of which are now covered by a red warning, signalling the likelihood of significant impacts.

Meanwhile, Orange Warnings cover the headwaters of the Otago and Canterbury lakes and rivers, and also Fiordland and Tasman.

In addition, a Watch for possible severe northwest gales has been issued for the Canterbury High Country.

Heavy rain can cause streams and rivers to rise rapidly. Widespread flooding and slips are possible, and driving conditions could be hazardous during the event. People are strongly advised to keep up to date with the latest forecasts.

You can keep updated by going to the Metservice which is under Reports button, in the Weather section on The Central App.

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