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Severe Weather Warning Issued - Significant Heavy Rain

11:42am, 5 May 2015

The MetService issued a severe weather warning at 11.00 am which includes the Nelson Tasman region.

  • Up to 150-250mm of rain is forecast
  • Streams and rivers may rose rapidly, watch for surface flooding and slips
  • Wind and rain can make driving hazardous - drive to the conditions

Please note that the forecast is evolving - view the latest forecast on http://www.metservice.com.

Forecast - Significantly Heavy Rain

AREA/S AFFECTED: THE RANGES OF BULLER AND NORTHWEST NELSON

Rain is expected to become heavy Wednesday afternoon, easing early Thursday morning. In the 15 hours from midday Wednesday to 3am Thursday expect 100-150mm to accumulate, but 250mm possible about the Paparoa Ranges. Peak intensities 15 to 25mm per hour late afternoon and evening Wednesday.

FREEZING LEVEL: 3400 metres, lowering to 3000 metres in heavy rain.

A copy of the full forecast is below.

An active trough is expected to move onto the South Island on Wednesday and is preceded by a strong, moist northwest flow. Rain is expected to become heavy in the southwest of the South Island this evening, with the heaviest falls likely about the Westland Ranges and Alps, where around 400-500mm could accumulate in a 24 hour period about some higher slopes. About remaining parts of Westland, northern Fiordland, the Otago and Canterbury Headwaters away from the main divide, and the Buller and northwest Nelson ranges around 150-250mm is expected during the same time. Although the rain is expected to ease in the far south later Wednesday, the flow is likely to remain northwest and further periods of heavy rain are possible later in the week.

This is a significant amount of rain for these areas, especially about Westland and the Canterbury Headwaters.

People are advised that streams and rivers will rise rapidly, affecting areas further downstream, especially in Canterbury and Otago. Surface flooding and slips are likely.

In addition, severe northwest gales are expected about the Canterbury High Country during Wednesday, gusting 130km/h. Winds of this strength are likely to bring down trees, powerlines and making driving conditions hazardous for high-sided vehicles.

These sites are also useful:

Heavy rain expected in Nelson, keep an eye on rivers

12:53pm, 26 April 2015

The MetService heavy rain warning has been widened to include all of the Nelson Tasman region.   Overnight tonight (Sunday) rainfall could be up to 250mm in the ranges and 120mm on the plains at intensities up to 30mm per hour.   Whilst not unduly high these forecast totals could lead to floods in some major rivers around an annual level, and also localised flooding from heavy rain.…

Read more about Heavy rain expected in Nelson, keep an eye on rivers

Friday’s earthquake a timely reminder

7:16pm, 24 April 2015

The earthquake centred between Kaikoura and St Arnaud at Friday 3. 36pm provided a timely reminder for people - natural disasters can strike at any time. "Nature has once again reminded us that we need to be prepared for any event – are your 'three day kits up to date with food and water and is your contact plan in place," said Roger Ball Nelson/Tasman CDEM Controller.…

Read more about Friday’s earthquake a timely reminder

Follow @nelsontasmancd on Twitter for the latest updates.

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