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Fall 2025 Weather Forecast: La Niña's Influence and the Calm Before the Winter Storm
• The Fall 2025 forecast indicates a weak La Niña event, which is expected to influence weather patterns, especially in North America, potentially leading to a cold winter.
• La Niña, the cold phase of the ENSO oscillation, is characterized by cooler-than-average sea surface temperatures in the tropical Pacific Ocean, impacting global weather systems.
• Current forecasts suggest further cooling in the Pacific, supporting the development of a weak La Niña, despite the current neutral ENSO phase.
• Historical data from weak La Niña events show a tendency for warmer Fall temperatures across the U.S. and southern Canada, creating a 'calm before the storm' scenario.
• The ECMWF and NMME models predict a warmer Fall across the United States, with potential for a high-pressure dominant pattern, particularly in the first half of the season.
• The forecast for November indicates less snowfall in the northeastern and western U.S., but more snowfall in the central Rockies and parts of Canada, which could lead to colder air.
• Looking ahead to winter, the analysis of weak La Niña winters suggests a potential reversal, with a cold anomaly over much of southern Canada and the U.S., hinting at a 'winter storm' following the calm Fall.
https://www.severe-weather.eu/long-r...tes-canada-fa/
