However, he said the current window of opportunity to get at the fire from the ground may be short-lived as the wind was forecast to pick up in the afternoon.
This could make the situation too dangerous for crew who'd need to be pulled back.
McNamara said contingency plans were in place to evacuate residents from a section of the Waihopai Valley if the winds took the fire down into the valley later today.
A meeting for residents has been set down for 11.30 this morning to ensure all were aware of the emergency arrangements.
In the "worst-case" scenario the fire service expected about a dozen properties could be affected.
But McNamara said these would all be given ample notice as necessary.
"We know a lot about fire behaviour and we also know the conditions we're dealing with and we will take a cautious approach as it's far better to pull people out than put them at risk."
Key Messages
• Parson's Road at the intersection with SH 63 is closed to the public. Speed restrictions (30km/hr) are in place and motorists are asked to exercise caution and patience as water tankers are crossing the state highway. The general public is asked to avoid the area if possible.
• Anyone driving in rural Marlborough should be aware of the smoke and take extra care where visibility is restricted.
• Residents in the Waihopai Valley closest to the fire zone are advised to ensure that any combustible material is well clear of their houses.