A Low pressure counterclockwise circulation forces air upward

A Low pressure counter-clockwise circulation forces air upward (ultimately resulting in condensation, cloud formation and ultimately precipitation). A high pressure clockwise circulation causes a sinking motion in the atmosphere, resulting in fair/clearer and often sunnier skies.

Air might feel like nothing to you and me, but it is actually very heavy. In fact, the pressure caused by all those gases in the atmosphere stacked on top of each other creates a great deal of pressure-about 14. 7 pounds pressing on every inch of our body. We don't notice it because we are used to it. But not all areas have the same exact air pressure. Some areas have more pressure than their surroundings, and some areas have less. Those that have less pressure are called lowpressure systems. Low-pressure systems pull air into them because nature wants everything to have equal pressure. By doing this, they generally create winds and undesirable weather. High-pressure systems, on the other hand, have more air pressure than their surroundings. That means they are pushing air away from them into the areas that have lower pressure. They are often associated with clear blue skies.

Requirement 3 Explain …… weather. Draw cross sections of a cold front and a warm front showing the location and movements of the cold and warm air, the frontal slope, the location and types of clouds associated with each type of front, and the location of precipitation. Use the next two slides to complete sections in your workbook.

Draw cross sections of a cold front and a warm front, showing the location and movements of the cold and warm air, the frontal slope, the location and types of clouds associated with each type of front, and the location of precipitation.

Draw cross sections of a cold front and a warm front, showing the location and movements of the cold and warm air, the frontal slope, the location and types of clouds associated with each type of front, and the location of precipitation.

That is all of # 3 Let’s look at Requirement #4 This Photo by Unknown Author is licensed under CC BY-NC-ND

Requirement 4. Tell what causes wind, why it rains, and how lightning and hail are formed. This Photo by Unknown Author is licensed under CC BY-NC-ND

Requirement 4 high pressure to low pressure. Wind is caused by air flowing from The Earth's rotation prevents that flow from being direct, but deflects it side to side(right in the Northern Hemisphere and left in the Southern Hemisphere), so wind flows around the high and low pressure areas.

Precipitation: What makes clouds, rain, snow, hail and sleet When warm, wet air rises, it cools, and water vapor condenses out to form clouds. A cloud is made up of small drops of water or ice crystals, depending on its height and how cold is the surrounding air. Height and temperature also determine whether any "precipitation" which results (from the Latin for "to fall from") will be rain or the hail associated with thunderstorms, or the snow, sleet and freezing rain we associate with winter weather. To form rain, water vapor needs what's called a "condensation nucleus", which can be tiny particles of dust, or pollen, swept up high into the atmosphere. When the condensing droplets that form the cloud get large and heavy enough to overcome the upward pressure of convection, they begin to fall. If the temperature all the way to the ground is above freezing, then--it's raining! When ice crystals form high up in the cloud, and it's below the freezing point of water all the way down, then you get snow. But when there alternating layers of air above and below freezing, you get other types of precipitation.

VIDEO Experiment: Let’s make it rain!

What makes Lightening? Thunder and lightning. When it comes to the forces of nature, few other things have inspired as much fear, reverence, or fascination – not to mention legends, myths, and religious representations. As with all things in the natural world, what was originally seen as a act by the Gods (or other supernatural causes) has since come to be recognized as a natural phenomena. By definition, lightning is a sudden electrostatic discharge during an electrical storm. This discharge allows charged regions in the atmosphere to temporarily equalize themselves, when they strike an object on the ground. Although lightning is always accompanied by the sound of thunder, distant lightning may be seen but be too far away for the thunder to be heard.

What makes Lightening? Lighting originates when wind updrafts and downdrafts take place in the atmosphere, creating a charging mechanism that separates electric charges in clouds – leaving negative charges at the bottom and positive charges at the top. As the charge at the bottom of the cloud keeps growing, the potential difference between cloud and ground, which is positively charged, grows as well. When a breakdown at the bottom of the cloud creates a pocket of positive charge, an electrostatic discharge channel forms and begins traveling downwards in steps tens of meters in length. In the case of cloud to cloud lightning, this channel is then drawn to other pockets of positive charges regions. In the case of cloud to ground strikes, the stepped leader is attracted to the positively charged ground.

Precipitation: What makes hail and sleet Hail is formed when drops of water freeze together in the cold upper regions of thunderstorm clouds. Hailstones are formed by layers of water attaching and freezing in a large cloud. A frozen droplet begins to fall from a cloud during a storm, but is pushed back up into the cloud by a strong updraft of wind, where it gathers frozen droplets until the ice becomes too heavy to stay aloft. Sleet is simply frozen raindrops and occurs when the layer of freezing air along the surface is thicker. This causes the raindrops to freeze before reaching the ground. . Gravity will usually cause the rain water to run to the underside of an object before it freezes.