There are warnings people living in the north of New Zealand could see flooding on Friday as Cyclone Oma "streaks" towards New Zealand.
Oma is not expected pass over New Zealand, but will affect the weather.
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Both NIWA and MetService have warned the cyclone could be bringing some rough weather to Northland and Auckland as it makes its way past.
MetService has issued a severe weather warning for Northland due to the rain, saying the region could see up to 100mm of rain.
"A low is expected to move across the upper North Island on Friday, bringing rain. The heaviest falls are forecast to affect Northland, and a full Warning is now in force," it said in a statement.
NIWA warned Auckland would be impacted by the weather too, and conditions could become hazardous after weeks without water in the north.
"Heavy rain possible for the extremely dry Northland on Friday as moisture from Tropical #CycloneOma streaks toward the region.
"When combined with dry, concrete-like ground, there may be flooding due to excessive runoff. Auckland will see some rain too."
MetService has issued a severe weather watch for Auckland north of Orewa, including Great Barrier Island.
It has not said how much is expected, but it could approach warning levels at times.