Weather not a worry for Patel

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New Zealand will be desperate for a dry day in Hamilton on Wednesday as they seek to wrap up a series-levelling Test win over South Africa, but Jeetan Patel will not be paying attention to any weather forecasts.

After securing a first-innings lead of 175 on day four, thanks largely to 176 from skipper Kane Williamson, the Black Caps strengthened their hold on proceedings by reducing South Africa to 80-5.

Rain could yet hamper New Zealand's chances of securing victory at Seddon Park, although Patel - who claimed 2-22 on Tuesday - appears to have little faith in the forecasters.

"I'm not having a dig at Apple here, but the iPhone app had 100 per cent thunderstorms all afternoon yesterday [Monday] and we didn't get any of it," the off-spinner was quoted as saying by stuff.co.nz.

"So it's a bit Hamilton-like, it comes and goes, it can go all round us.

"It will be interesting to see what the weather is, but that's not for us to worry about."

New Zealand will have no reviews to call on in Wednesday's morning session, having wasted both on the fourth evening following optimistic caught-behind appeals against JP Duminy.

"We're almost better off not having them [reviews], to be honest with you," Patel added.

"We've had a stinker. We've missed a couple of opportunities. But we've tended to box on without them, so we've just got to do that again I suppose."

South Africa will resume with Faf du Plessis - a player with experience of fifth-day heroics - and Quinton de Kock both unbeaten on 15.