Seasonal Climate Outlook November 2024 to January 2025











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Full report can be read at: • https://niwa.co.nz/climate-and-weathe... • Outlook summary: • -A La Niña Watch remains in effect with a 60-70% chance that an event officially develops by December. La Niña-like patterns will favour more high pressure south of New Zealand over the next three months, coming with a gradual reduction in the typical westerly winds. • -Rainfall is about equally likely to be near normal or below normal in the west of the North Island. For all remaining regions, near normal rainfall is most likely. • -During La Niña-like conditions, blocking high pressure to the south of New Zealand may enable low pressure systems to become stalled near the country. This introduces the chance for heavy rainfall events, which could occur during October. Monitor NIWA35 for updates. • -The chance for more high pressure near the South Island and easterly quarter air flows later in the three-month period may see dry spells develop, especially in the west of both islands. • -Air temperatures are most likely to be above average across the country. Warm air masses will flow from Australia into New Zealand at times during October. An increased prevalence of northeasterly winds may lead to more days above 25˚C in November-December. • -As easterly quarter winds become more common than normal during this three-month period, overnight minimum temperatures may be unusually warm in the east of both islands, while daytime temperatures may not be as unusually warm in these areas. • -Coastal sea surface temperatures (SSTs) ranged from 0.54˚C to 1.02˚C above average during September. At the end of the month, marine heatwave conditions were occurring near the northern and western North Island and northern South Island. Monitor the SST update for updates, which suggests marine heatwave conditions may intensify in the months ahead, which often occurs during La Niña summers. • -Spring soil moisture levels and river flows are most likely to be near normal in all regions of the country except for the east of the North Island and north of the South Island where they are about equally likely to be near normal or below normal. • -Despite near-surface soil moisture increases in the last month, soil moisture levels at depth continue to be below normal in the east of both islands.

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