A series of heavy rain warnings have been issued for the West Coast as a front slowly moves over the South Island tomorrow and Monday.
Orange heavy rain warnings have been issued for the ranges of the Buller District, the ranges of the Grey District, Westland, and the headwaters of the Canterbury Lakes and Rivers about and south of Arthur's Pass.
The warning for Buller lasts from 1am Sunday to 6pm Monday, with 100 to 150mm of rain expected.
The warning for Grey is for 18 hours from 9pm Sunday to 3pm on Monday with an expected 100 to 130mm.
Westland's warning lasts for 27 hours from 10am tomorrow to 1pm on Monday, with 300 to 400 mm of rain expected.
The Canterbury warning will last for 24 hours from 2pm Sunday to 2pm Monday with 300 to 400mm of rain expected.
"Streams and rivers may rise rapidly. Surface flooding, slips, and difficult driving conditions possible," MetService said.
"Clear your drains and gutters to prepare for heavy rain. Avoid low-lying areas and drive cautiously."
Full list of rain warnings:
Heavy Rain Warning – Orange
Ranges of the Buller District – 17 hours from 1am to 6pm Monday.
Ranges of the Grey District – 18 hours from 9pm Sunday to 3pm Monday.
Westland District – 27 hours from 10am Sunday to 1pm Monday.
Headwaters of the Canterbury Lakes and Rivers about and south of Arthurs Pass – 24 hours from 2pm Sunday to 2pm Monday.
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