This way, ENSO strongly impacts the tropical rainfall and pressure patterns, affecting the ocean-atmosphere feedback system. At the same time, the air is descending in the western Pacific, causing stable weather and high-pressure conditions. Rising air in the eastern Pacific causes more storms and precipitation and lowers the pressure over that region. The following image below from NOAA Climate shows the typical circulation during an El Niño event, which will be the dominant phase for the next 10 months at least. But it is usually more influential during the peak of its phase in Fall and Winter. We can observe a global shift in pressure patterns during the emergence of an ENSO phase. These pressure changes translate into global circulation over time, affecting seasonal weather over both Hemispheres. But during a La Niña, the pressure over the equatorial Pacific rises, creating stable conditions and fewer storms. Besides the ocean temperatures, one of the main differences between the phases is the pressure patterns they promote, seen below as high (H) and low (L) pressure zones.ĭuring an El Niño, the pressure over the tropical Pacific drops, with more rainfall and storms in this region. The cold ENSO phase is called La Niña, and the warm phase is called El Niño. The last phase was a cold La Niña and it spanned three years. It then lasts until Spring, but some events can last up to two or three years. This affects the overall global circulation over time, changing the weather patterns worldwide.Ī (cold/warm) phase usually develops between late Summer and early Fall. But notice the regions 1+2, as they play an important role.Įach ENSO phase influences the pressure and weather in the tropics differently. The main area combines regions 3 and 4, seen in the image as the Nino 3.4 region. Regions 3 and 4 expand over the east and west tropical Pacific. The image below shows the ENSO regions across the tropical Pacific. Typically there is a phase change around every 1-3 years. ![]() Then you will see how El Niño is currently growing and how it is expected to influence the upcoming weather seasons, from the Hurricane season to the Winter 2023/2024.Įl Niño is a phase of the ENSO, which stands for “ El Niño Southern Oscillation.” This region of the equatorial Pacific Ocean regularly shifts between warm and cold phases. ![]() Ocean anomalies have a known impact on the atmosphere and our weather on smaller and larger scales, especially during the Winter season, when the pressure systems are strongest.įirst, we will quickly look at the connection between the oceans and the atmosphere. Based on the latest global anomaly data, this El Niño might be something we have never seen before in such an environment. A moderate to strong El Niño event is expected to occur, with global weather impacts in the second half of the year and over the Winter season of 2023/2024. If you are interested in extending the current license for additional purposes, please check out my EXTENDED LICENSES for digital resources, yearbooks, store logos, free and paid educational videos, and website and blog use.El Niño is developing rapidly, with an official watch currently in effect, issued by NOAA. Please review my full TERMS OF USE POLICY prior to purchasing. These illustrations can be hand drawn images that have been scanned into the computer or fully digital images drawn on a tablet and colored using graphic design software.Ĭlassroom teachers use clip art to decorate their bulletin board, spice up a PowerPoint presentation, design worksheets and handouts, compose classroom newsletters, decorate your classroom, and create a class schedule with pictures for special needs students.įor personal and commercial use. Create a list of rules for behavior management, placing one rule on an Autumn leaf so students "fall" into good behavior.Ĭlip art (or "clipart") are digital images that can be imported into graphic design or desktop publishing software to create documents such as for classroom use. Design your First Day of Fall bulletin board by writing each new students's name on one of the leaves for display. Head into the Back to School season with this sparkly set of Fall leaves.
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