The USA National Phenology Network reports on variations in spring leaf-out timing across different regions of the US, with some areas experiencing delays while others are ahead of schedule. This shift in phenology is linked to climate change and is also influencing pollen seasons, leading to concerns about increased allergy symptoms. The article explores the impact of these changes on human health and the environment.
Data from the USA National Phenology Network reveals that many communities along the West Coast, Gulf Coast, and Southeast are witnessing the emergence of new leaves following the dormant winter months. However, the timing of this spring leaf-out differs from previous years. For example, the Southeast's spring leaf-out process is approximately 1-2 weeks later than the long-term average, while growth in states like California, Arizona, and Nevada is ahead of schedule by a week or more.
This data is based on observations of the first leaves on lilacs and honeysuckles, which are typically the initial indicators of a more widespread leafing event.A significant historical snowstorm and accompanying arctic blast of cold air that impacted a large portion of the South is likely contributing to some of the delayed growth. New Orleans experienced around 8 feet of snow, while communities in the Florida Panhandle reported accumulations approaching double digits. Despite the cold weather, there were no reported significant crop losses, thanks to the heavy snowfall and the rapid rebound in temperatures, which quickly soared to near-record highs.Communities where leaf production is already underway are also observing an increase in pollen, which typically coincides with the rejuvenation of vegetation. Pollen levels in parts of Florida and Texas have been reported as extremely high, while medium to high levels have been recorded in the Southwest and Gulf Coast. Tree allergens such as junipers, maples, and oaks are primarily responsible for the activity in the Southeast, while alders and ashes are more prevalent in the West. Allergy specialists estimate that over 50 million Americans experience allergic reactions, with millions more who remain undiagnosed or untreated. According to a study published in the Proceedings of the National Academy of Sciences, pollination is occurring nearly three weeks earlier than during the 1990s and in many seasons is more extensive. 'Our results reveal that anthropogenic climate change has already exacerbated pollen seasons in the past three decades with attendant deleterious effects on respiratory health,' the study authors wrote.The USA National Phenology Network has introduced a new Late Bloom Index for 2025, which will track the progress of the conclusion of the spring season. 'This information will help us understand the length of the spring season in a particular year, as well as whether a location that sees an early start to spring also sees an early end,' the group stated. The USA National Phenology Network has made it easy to determine how activity in your community compares to previous years. Users can search data by zip codes to determine how far ahead or behind the growing season is compared to normal. Find more updates on this story at FOXWeather.com
Climate Change Phenology Allergies Pollen Season Spring Leaf-Out
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