Have you ever heard your local weather forecaster mention terms like “pineapple express” or “atmospheric river”? These intriguing phenomena might sound whimsical, but they play a crucial role in our weather patterns. So, what exactly are they, and is global warming to blame?

What is an Atmospheric River?

An atmospheric river is like a giant, invisible river in the sky, carrying vast amounts of moisture from the ocean to the land. When this moisture encounters mountains or cooler air, it can turn into heavy rain or snow. While this can provide much-needed water, it can also lead to flooding and other weather-related problems.

California’s Experience

Over the past two winters, California and the West have experienced several atmospheric rivers. Scientists at the Center for Western Weather and Water Extremes (CW3E) are working hard to better predict these events and understand their implications for rainfall and snowfall across the state.

The Role of Global Warming

As our planet warms, the air can hold more moisture. This means atmospheric rivers can carry even more water vapor than before, resulting in significant rainfall in a short period. Some atmospheric rivers can bring over 10 inches of rain, leading to severe flooding and water accumulation.

Research and Insights

In the latest Perspectives on Ocean Science lecture, CW3E Deputy Director Julie Kalansky discusses how scientists are researching the causes and consequences of these atmospheric rivers. They are working to understand the impact of climate change on the frequency and intensity of these weather phenomena.

Learn More

Want to learn more? Watch “Understanding Atmospheric Rivers” to see how experts are unraveling the mysteries of these powerful weather systems and their link to climate change.