{"id":86371,"date":"2021-07-19T16:12:00","date_gmt":"2021-07-19T21:12:00","guid":{"rendered":"https:\/\/www.mometrix.com\/academy\/?page_id=86371"},"modified":"2026-03-26T13:04:52","modified_gmt":"2026-03-26T18:04:52","slug":"where-does-wind-come-from","status":"publish","type":"page","link":"https:\/\/www.mometrix.com\/academy\/where-does-wind-come-from\/","title":{"rendered":"Where Does Wind Come From?"},"content":{"rendered":"\n\t\t\t<div id=\"mmDeferVideoEncompass_j4fAs1Hd1pc\" style=\"position: relative;\">\n\t\t\t<picture>\n\t\t\t\t<source srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.webp\" type=\"image\/webp\">\n\t\t\t\t<source srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.png\" type=\"image\/jpeg\"> \n\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" loading=\"eager\" id=\"videoThumbnailImage_j4fAs1Hd1pc\" data-source-videoID=\"j4fAs1Hd1pc\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.png\" alt=\"Where Does Wind Come From? 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Wind is simply moving air caused by differences in air pressure. Air pressure is something that varies greatly all across the planet.<\/p>\n<p>Take a look at this map of the United States. You might recognize some things on this map, like cold fronts, warm fronts, or stationary fronts. <\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-90199\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-1.png\" alt=\"Image of wind circulation.\" width=\"777\" height=\"437\"style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-1.png 1920w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-1-300x169.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-1-1024x576.png 1024w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-1-768x432.png 768w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-1-1536x864.png 1536w\" sizes=\"auto, (max-width: 777px) 100vw, 777px\" \/><\/p>\n<h2><span id=\"Mapping_Isobars_and_Pressure_Gradients\" class=\"m-toc-anchor\"><\/span>Mapping Isobars and Pressure Gradients<\/h2>\n<p>\nLet\u2019s focus on the maroon-colored lines. These are called <strong>isobars<\/strong>! They represent areas of equal pressure, and they are labeled in millibars. Millibars are a measurement of pressure used by meteorologists to determine air pressure, which allows them to predict the weather.<\/p>\n<p>Now, focus your attention on the big blue H above Minnesota. This high-pressure system has a pressure of 1,019 mb. The next isobar below is labeled 1,016 mb, the next 1,012 mb, the next slightly east 1,008 mb, and so on. Air, like any other gradient, always flows from a higher concentration to a lower concentration.<\/p>\n<p>If we start at that H above Minnesota and follow our isobars from high to low values, we will see an air pattern that moves towards the southeast. Congratulations, you\u2019ve just determined which way the wind is blowing!<\/p>\n<p>Another important thing to note about pressure gradients and isobars is that the bigger the pressure difference, the faster the air will flow. When there is a large difference in air pressures, you have a steep gradient. This will be marked by tight isobars, as you see on the eastern coast of the United States here.<\/p>\n<p>When there is not a large pressure difference between two areas, we have a weak gradient, and wind speeds will be light. When you see an isobar map with very spaced out isobars, you\u2019ll know it\u2019s a weak gradient as you see throughout the mid-US on this map.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-90202\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-2.png\" alt=\"Image  of the different types of wind and where they are located.\" width=\"777\" height=\"437\"style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-2.png 1920w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-2-300x169.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-2-1024x576.png 1024w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-2-768x432.png 768w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-2-1536x864.png 1536w\" sizes=\"auto, (max-width: 777px) 100vw, 777px\" \/><\/p>\n<h2><span id=\"Global_Wind_Patterns\" class=\"m-toc-anchor\"><\/span>Global Wind Patterns <\/h2>\n<p>\nNow, each region of the globe has a prevailing wind \u2013 meaning that, generally, wind always blows from a particular direction. This is not to be confused with a dominant wind. A dominant wind is simply the wind with the highest speed in a particular area at a particular time. Think of prevailing wind as large-scale and dominant wind as small-scale. For instance, in the US as a whole, the prevailing winds come from the west. However, the dominant wind on some particular day in Kansas could be blowing from the south.<\/p>\n<p>The prevailing winds that come from the west and are blowing toward the east are called \u201cwesterlies,\u201d and they are found in the mid-latitudes, located at 30-60 degrees. In the Northern Hemispheric tropics (near the equator), we have prevailing northeasterly trade winds. In the Southern Hemispheric tropics, we have prevailing southeasterly trade winds. Trade winds, also known as Tropical Easterlies, are located at 0-30 degrees latitude and converge near the Equator, and we&#8217;ll discuss that a little later. In the polar regions, we have prevailing polar easterlies, which blow from 60-90 degrees latitude. The general circulation of the wind is divided into three wind belts: Tropical Easterlies, Prevailing Westerlies, and Polar Easterlies. Between these two lines of latitude, we have convection cells. In a convection cell, air moves up, over, down, over, and back up, in a cycle. Depending on the wind belt, these convection cells move in different ways.<\/p>\n<p>First, notice the red arrows indicating prevailing winds within wind belts. As I said before, we have polar easterlies, mid-latitude westerlies, Northern Hemisphere northeasterly trade winds, and Southern Hemisphere southeasterly trade winds. Where the polar easterlies and mid-latitude westerlies come together, we have a band of low-pressure called the subpolar low. We have this in both the Northern and Southern Hemispheres. As two air masses converge, the air has nowhere to go but up, producing clouds, storms, and low-pressure systems that affect the Pacific northwestern United States, and much of Europe. Ever wonder why England and Oregon are so dreary and rainy most of the time? This is why!<\/p>\n<p>Next, note the arrows moving away from each other at the mid-latitudes. As air masses move away from each other, we have high-pressure systems and generally good weather. In both the Northern and Southern Hemispheres, these bands are known as the subtropical highs.<\/p>\n<p>As mentioned before, at the Equator, where the trade winds meet, we have what\u2019s known as the <strong>Inter-Tropical Convergence Zone<\/strong>, or the ITCZ. Again, because two air masses are converging, we have a low-pressure zone that produces clouds, storms, and heavy rainfall. Just to prove this point, look at this map of the world\u2019s rainforests, and notice their location with regard to the equator and therefore the ITCZ.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-90205\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-3.png\" alt=\"Image of the equator drawn over the tropical rainforests. \" width=\"777\" height=\"437\"style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-3.png 1920w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-3-300x169.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-3-1024x576.png 1024w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-3-768x432.png 768w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-3-1536x864.png 1536w\" sizes=\"auto, (max-width: 777px) 100vw, 777px\" \/><\/p>\n<p>You\u2019ll see they match up perfectly.<\/p>\n<h2><span id=\"Convection_Cells\" class=\"m-toc-anchor\"><\/span>Convection Cells<\/h2>\n<p>\nNow, let\u2019s talk about those convection cells and how they move.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-90208\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-4.png\" alt=\"Image of Global Atmospheric Circulation broken up into convection cells. The top cells are Polar cells, mid-latitudes are Ferrel cells, and low latitudes have Hadley cells.\" width=\"777\" height=\"437\"style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-4.png 1920w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-4-300x169.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-4-1024x576.png 1024w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-4-768x432.png 768w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-4-1536x864.png 1536w\" sizes=\"auto, (max-width: 777px) 100vw, 777px\" \/><\/p>\n<p>Each wind belt has its own convection cell. High latitudes have polar cells, mid-latitudes have Ferrel cells, and low latitudes have Hadley cells. Let\u2019s start with the Equator and work our way poleward.<\/p>\n<p>Note on the diagram the red arrows, indicating warm air, coming together, and then moving upward. As this air rises and cools, it moves poleward toward the mid-latitudes, and then sinks. Remember, cold air sinks because it is more dense. Because of the northeasterly trade winds, air will then flow back toward the Equator, and voil\u00e1! A cycle of the Hadley cell.<\/p>\n<p>Next up is the <strong>Ferrel cell<\/strong>, found in mid-latitudes. Because of the divergence in air masses here, we have air that is heated by the ground in mid-latitudes moving poleward. When it meets the polar air mass, it is forced upward. Remember, this produces a low-pressure band called the subpolar low. As the air rises and cools, it will move south back toward the mid-latitudes, where eventually it sinks. Again, the sinking motion causes a band of high pressure. The warm air will then make its way poleward, having completed a cycle of the Ferrel cell.<\/p>\n<p>Last but not least, we have the <strong>polar cell<\/strong>. The polar cell is much like the Hadley cell, but smaller and more shallow. Converging air masses at about 60\u00b0 latitude force cold air upwards, once again producing that low-pressure band with clouds and storms. The air cools even more as it moves toward the poles and then sinks. Sinking air equals high pressure, so we have polar highs near both the North and South Poles.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-90211\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-5.png\" alt=\"Closer look at convection cells and how they look. The jet streams in each of the cells have a circular motion in the location they are in. \" width=\"777\" height=\"437\"style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-5.png 1920w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-5-300x169.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-5-1024x576.png 1024w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-5-768x432.png 768w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/08\/Wind-Patterns-5-1536x864.png 1536w\" sizes=\"auto, (max-width: 777px) 100vw, 777px\" \/><\/p>\n<p>Here\u2019s a cross-section of these cells, so that you can get a sense of their size, depth, and the  height of clouds they produce. One thing you\u2019ll notice in this image is the presence of jet streams, which we haven\u2019t talked about yet. Let\u2019s quickly go over jet streams and how they may influence wind flow in the upper atmosphere.<\/p>\n<h2><span id=\"Jet_Streams\" class=\"m-toc-anchor\"><\/span>Jet Streams <\/h2>\n<p>\n<strong>Jet streams<\/strong> are fairly narrow bands of fast-flowing air in our upper atmosphere, roughly 5 to 9 miles above Earth\u2019s surface. There are four main jet streams that encircle our planet: two polar jet streams and two subtropical jet streams. They\u2019re found in regions where cold air masses meet warm air masses. Jet streams feature wind that blows from west to east, due to Earth\u2019s rotation. Sometimes, though, the bands may shift north and south, depending on the boundaries between air masses. <\/p>\n<p>At the <strong>subpolar low<\/strong>, very cold air from the poles meets with warmer air from the mid-latitudes. As this air is forced upward, we have a jet stream that can help transport weather systems toward the west. Because of the stark difference in air mass temperatures, these jet streams are the strongest.<\/p>\n<p>The <strong>subtropical jet streams<\/strong> are located where warm equatorial air meets the slightly cooler air from the mid-latitudes. When tropical air is forced upward at the Equator, it moves poleward. However, it doesn\u2019t do so in a direct route. Our planet is spinning, and we have something called the Coriolis effect. The air does move poleward, but it sort of spirals around the globe to get there.<\/p>\n<p>This band of \u201cspiralization\u201d is what we call the subtropical jet!<\/p>\n<hr>\n<h2><span id=\"Review\" class=\"m-toc-anchor\"><\/span>Review<\/h2>\n<p>\nOkay, before we go, let\u2019s wrap things up with a quick review of what we\u2019ve discussed, then we\u2019ll try out some review questions.<\/p>\n<p>Winds are the result of air moving by convection. Masses of warm air rise, and cold air sweeps into their place. As the warm air moves, it eventually cools and sinks. The term \u201cprevailing wind\u201d refers to a regional wind that usually blows in a single direction. Dominant winds are the winds with the highest speeds in a particular area at a particular time. At the higher and lower latitudes, the direction is easterly, and at mid-latitudes, the direction is westerly.<\/p>\n<p>Belts or bands that run latitudinally and blow in a specific direction are associated with convection cells. Hadley cells are formed directly north and south of the Equator, Ferrell cells occur at about 30\u00b0 to 60\u00b0, and polar cells occur at about 60\u00b0. Jet streams are fairly narrow bands of fast-moving air in our upper atmosphere, found in regions where cold air masses meet warm air masses. <\/p>\n<p>Okay, let\u2019s go over a few review questions.<\/p>\n<p>1. What is the name for an area of latitude that has the same prevailing wind?<\/p>\n<ol style=\"list-style: upper-alpha;\">\n<li>Jet stream<\/li>\n<li>Hadley cell<\/li>\n<li>Wind belt<\/li>\n<li>Ferrel cell<\/li>\n<\/ol>\n<div style=\"text-align: center; margin-bottom: 20px;\">\n   <button class=\"buttontranscript\" onClick=\"toggle('Answer1')\">Show Answer<\/button>\n<\/div>\n<div id=\"Answer1\" class=\"showanswer\">\n   <strong>The correct answer is C.<\/strong><\/p>\n<p style=\"text-align: left;\">The wind belts include polar easterlies, mid-latitude westerlies, and the equatorial trade winds.<\/p>\n<\/div>\n<p>\n&nbsp;<br \/>\n2. Which jet stream is stronger, and why?<\/p>\n<ol style=\"list-style: upper-alpha;\">\n<li>The subtropical jet; because the difference in air mass temperature is greater.<\/li>\n<li>The polar jet; because the difference in air mass temperature is greater.<\/li>\n<li>The subtropical jet; because the difference in air mass temperature is lower.<\/li>\n<li>The polar jet; because the difference in air mass temperature is lower.<\/li>\n<\/ol>\n<div style=\"text-align: center; margin-bottom: 20px;\">\n   <button class=\"buttontranscript\" onClick=\"toggle('Answer2')\">Show Answer<\/button>\n<\/div>\n<div id=\"Answer2\" class=\"showanswer\">\n   <strong>The correct answer is B.<\/strong><\/p>\n<p style=\"text-align: left;\">The polar jet stream is stronger because the difference in temperature between polar air masses and mid-latitude air masses is greater than that between the mid-latitudes and tropical regions.<\/p>\n<\/div>\n<p>\n&nbsp;<br \/>\nThat\u2019s all for this review! 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