Update 5:30pm:

As at 5pm the road between Hira and Rai Valley is now open to all traffic.

Road conditions remain unpredictable and there is likely to be further small debris and tree falls overnight so caution is advised while travelling through the area. NZTA encourages road users to drive to the conditions.

Drive safe and report any state highway faults or damage to 0800 4 HIGHWAYS (0800 44 44 49).

Update 12.16pm: 

The detour route between Nelson and Blenheim is via SH6 to Kawatiri, left onto SH63 heading north via St Arnaud to Blenheim. Reverse for opposite direction.

This has now been updated below:

11.33am

To keep people safe, the stretch of State Highway 6 (SH6) between Hira and Rai Valley is now closed.

Work is ongoing to assess the road which is also susceptible to wind and fallen trees. NZ Transport Agency Waka Kotahi (NZTA) advises people delay their journey if possible, exercise caution if you must travel and drive to the conditions.

An alternative route is available via SH6/SH63 through the Wairua Valley.

People should continue to check weather and road condition updates and are also encouraged to report any state highway faults or damage to 0800 4 HIGHWAYS (0800 44 44 49).

It is critical people stay off closed roads. Disobeying closures puts yourself and others at risk.

Further updates will be provided as the situation changes.