Metservice has issued a heavy rain warning for the Bay tomorrow.
Rain is expected to become heavy early Tuesday morning, before easing at night.
In the 18 hours between 6am and midnight Tuesday, 100mm to 120mm of rain is expected to accumulate about the hills and ranges, with 70mm to 90mm possible elsewhere.
Peak intensities of 20mm to 30mm per hour are likely Tuesday afternoon and evening with possible thunderstorms.
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People are advised that this rain could cause rivers and streams to rise rapidly, surface flooding, slips and make driving conditions hazardous.