Key facts:

• There is a greater than 60% probability that the El Niño event will be classified as ‘strong’ by spring.
• El Niño events often result in south-westerly winds over New Zealand, leading to increased rainfall in the south and west.
• This winter could bring dry conditions in the north and east while wetter conditions are likely in the west.

Jon Tunster, a meteorologist with Earth Sciences New Zealand, noted, “La Niña has only just ended, but there are indications that we’ll see a rapid flip to El Niño.” He added, “Given the projected strength of this event, it will be very surprising if New Zealand doesn’t feel some impacts.”

The Relative Oceanic Niño Index (RONI), which tracks ENSO conditions, is already showing a rapid rise consistent with the onset of El Niño. Warm sub-surface waters in the tropical Pacific Ocean are key indicators of significant El Niño events.

Daniel Kingston also emphasized that “put simply, El Niño is often associated with large-scale releases of heat from the tropical Pacific Ocean.” He warned that if projections hold true, “the impacts may be substantial.”

While officials expect notable changes in weather patterns, they acknowledge uncertainties remain. The exact strength of this El Niño event will become clearer in the coming months.

Сообщение El Niño to Impact New Zealand’s Weather This Winter появились сначала на newsnz.

The forecast predicts a greater than 60% chance that this El Niño event will be classified as ‘strong’ by spring. Warm ocean temperatures in the central and eastern tropical Pacific are driving this shift, leading to expectations of varied rainfall across different regions.

Expected impacts this winter:

• Increased rainfall is anticipated for Southland, parts of Otago, and western-facing areas of the South Island.
• Much of the remainder of New Zealand may experience reduced rainfall.
• Dry conditions might become concerning as spring approaches in areas with less winter precipitation.
• Occasional cold snaps could occur, lasting a few days at a time.

Tunster emphasizes the importance of monitoring these changes: “Given the projected strength of this event, it will be very surprising if New Zealand doesn’t feel some impacts.” The atmospheric response from El Niño may also strengthen high-pressure systems over Australia during the winter months.

This year marks a notable shift after an extended period of La Niña conditions. For six months, scientists have monitored signs of developing El Niño. The Relative Oceanic Niño Index (RONI) shows a rapid rise consistent with its onset. Warm water beneath the surface of the tropical Pacific Ocean is moving eastward—an indicator that significant changes are on the horizon.

Key indicators include:

The atmospheric response expected as warm sub-surface waters reach the surface. and Potential dramatic impacts on large-scale global weather systems, including the Indian monsoon and North Pacific storm track.

As winter approaches, communities across New Zealand are advised to prepare for these potential shifts in weather patterns. While some regions may benefit from increased rainfall, others might face challenges due to dryness. The next few months will be crucial in understanding how these changes will unfold.

Сообщение Winter: New Zealand’s weather impacts due to El Niño появились сначала на newsnz.