12/04/2026
Marlborough Civil Defence and Emergency Management is expecting another weather forecast from MetService New Zealand shortly, which Council's Rivers team and hydrologist will then use to run their model for the Wairau River system. Actual rainfall data will also inform their thinking.
Forecasting rainfall and its effects on the Wairau River plain can be challenging when different weather forecast models predict different rainfall levels in different places. However the closer we get to a storm event the easier it is to make accurate predictions for each area.
At this stage the emergency management team is busy gathering all the latest information, under the leadership of Incident Controller Richard MacNamara. Rivers Manager Andy White and his team are busy crunching the incoming data as we speak. Council and Marlborough Roads staff are out and about, checking on our three waters systems and our roading network. Fire and Emergency, Police and other key agencies are on standby, in case they are needed.
WE PLAN TO PROVIDE ANOTHER UPDATE BY ABOUT 3pm TODAY.
The current forecast is below.
Area: Eastern Marlborough, especially between Blenheim and Kaikoura, and about the Richmond Range
Period: 14hrs from 9am - 11pm Sun, 12 Apr
Forecast: Expect 70 to 100 mm of rain to accumulate, but up to 120 mm possible about the Seaward Kaikoura Range. Peak rates of 20 to 30 mm/h expected this afternoon and early evening. Minimal chance of upgrading to a Red Warning.
Impact: Streams and rivers may rise rapidly. Surface flooding, slips, and difficult driving conditions possible.
Action: Clear your drains and gutters to prepare for heavy rain. Avoid low-lying areas and drive cautiously.
IMAGE: the Incident Management Team, Emergency Coordination Centre, Blenheim, 12.40pm today.
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