Active Weather Continues

Published: Thu 24 Nov 2022 11:35 AM
Another day or two of active weather is on the cards for Aotearoa / New Zealand, with MetService highlighting a risk of thunderstorms for most of the country on Thursday. A Heavy Rain Watch has also been issued for the Tararua Ranges, running until 3am on Friday.
MetService meteorologist Alwyn Bakker explains, "Aotearoa is currently lying under an unsettled westerly flow, with a series of active fronts bringing showers, some heavy with possible thunderstorms and hail." All of the North Island sees some risk of thunderstorms on Thursday, as well as northern Westland and Buller, the Canterbury Plains, Otago, and Southland. "In the North Island, those thunderstorms may be squally, with wind gusts of 80-100km/h possible," warns Bakker.
With a move away from the recent northwesterlies, temperatures are expected to return to more normal levels for this time of year. "Winds from the northwest tend to drag more tropical air towards Aotearoa, which is warmer and more humid," explains Bakker. "These conditions are generally more unstable, leading to an increased risk of thunderstorms. As the flow loses its northerly component, we lose that access to tropical air, temperatures decrease, and the risk of thunderstorms tends to follow suit."
The westerly flow is set to ease on Friday, before a broad trough moves eastward across the country over the weekend, bringing more showers for most. "At this stage, different computer projections disagree about the speed of this next weather feature, so keep up to date with the latest forecasts at," adds Bakker.
The weather around the country looks generally settled on Monday but another band of rain is lined up to cross from the west before month’s end.

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