This creates a more unstable atmosphere favourable for thunderstorms.
“The potential of having those severe thunderstorms on top [of heavy rain] would mean parts of the area see high-intensity rainfall on already sodden ground,” he said.
“If there happened to be a severe thunderstorm or downpour this afternoon or overnight, those impacts would come along faster.”
This could mean an increased risk of slips, rising rivers and flooding, he said.
Ferris said although it feels like Northland has seen a lot of this weather system, it is expected to last until over the weekend with a possible break on Saturday for some areas.
The severe thunderstorm watch is in place until 10am tomorrow.
A heavy rain warning is also in place for Northland, north of Whangārei until tomorrow with a low chance of upgrade to a red warning.
Driving conditions may be hazardous with surface flooding and poor visibility.
MetService encourages people to clear their drains and gutters and avoid low-lying areas where possible.
Brodie Stone is an education and general news reporter at the Advocate. Brodie has spent most of her life in Whangārei and is passionate about delving into issues that matter to Northlanders and beyond.