"It is really blowing up now - the sea is getting wild."
Former cyclone Gita is moving quickly towards the top of the South Island today, bringing wind gusts of more than 150km/h in places, heavy rain and northwest swells of 8 to 9m.
MetService meteorologist Nick Zachar said the system was expected to hit Farewell Spit and move across the top of the South Island from about 7 or 8pm today.
Severe rain and wind warnings are in place for Buller through to 9pm and 10pm tonight respectively.
Another 70 to 100mm of rain is expected, and severe gale easterly winds could reach 130 to 140km/h in exposed places.
There is also the potential for coastal inundation with high tide overnight tonight, and before dawn tomorrow, due to the combination with low air-pressure, strong onshore winds and large waves in excess of 6 metres in places.
Large waves during high tides Taranaki, Kapiti & Nelson around 2am tonight, and Kaikoura and Canterbury 9pm this evening, then Weds 10am and 10pm could cause coastal inundation. Head to our Marine Coastal areas at https://t.co/hnwmGxU1gR for expected swell heights. ^RK pic.twitter.com/swQg644Rzn
"We should get 70-100mm of rain here in the next 24 hours, and the strong winds are of concern.
"There has been a high level of concern for the coastal towns of Granity and Hector, but the storm surges appear to have dissipated slightly.
"There will still be high seas though, and for the properties previously affected by Fehi, this does not help."
They were still finding tourists parking on the coast, and were requesting they went to official campgrounds rather than free camp, as it was easier to monitor peoples' safety.
The Department of Conservation had been warning people not to go hiking, especially on the Heaphy Track, he said.
"They have taken their staff off the track and are warning people about the dangers."
Howard would be meeting at 2.30pm with other officials and emergency staff to reassess the situation.
Comparing our fresh-off-the-press high resolution model guidance with the previous run -- strong consistency across the South Island for heavy rainfall, peaking late Tuesday. Watch for flooding and slips! pic.twitter.com/x0vv9GjpRJ