Lesson 3. Air Masses and Fronts Meet in the SkyOh My!
Pd: ______. Weather Activity #3: Air Masses & Fronts. NAMING & LOCATING AIR MASSES: An air mass is a large body of air with relatively uniform temperature and humidity 4. What is the connection between weather fronts and air masses ?. A useful lesson to introduce students to movement of large masses of air and how and describe the characteristics and interactions of air masses and fronts. . them on top of one another to see the relationship of one variable to the next. When you've finished this page, you should be able to explain air mass formation , name and describe the The Connection Between Air Masses and Fronts.
By developing technology that allows people to predict storms and launch warning systems, engineers help in the effort to save lives from destructive storms. Engineers also help our communities design systems to manage all the extra rainwater and runoff from a storm.
Five steps precede the occurrence of a thunderstorm. The process begins when warm, wet air rises from the ground. Once the air rises high enough, it begins to cool and form clouds, which continue to rise. Once the clouds rise about 40, feet, depending on the temperature, large heavy water droplets or huge frozen ice crystals begin to form.
These particles then fall back through the clouds, creating powerful downdrafts. On Earth, we would likely experience such a storm as heavy rain, thunder and lightning.
A single bolt of lightning can carry about 30 million volts — enough electrical energy to power all of New York. If the wind hitting the top of the storm cloud is blowing in a different direction from the wind below it, the storm system starts to rotate. As the warm and cold air currents interact, the storm begins to rotate faster and faster, accelerating winds to blow as fast as miles per hour.
The funnel of a tornado can be as small as 50 feet or as big as one mile wide, allowing tornadoes to damage areas up to miles long.
Most tornadoes exist for fewer than 15 minutes. Hurricanes are huge storms that form over very warm, tropical waters when unstable air has a unique mix of both high and low pressures.
A hurricane is essentially a cluster of several thunderstorms that have formed together. The storm is classified as a hurricane if the storm winds are detected to be 74 miles per hour or higher. Hurricanes can last from several hours to several weeks. A tropical storm with winds of 74 miles per hour or higher. A violent disturbance in the atmosphere. A disturbance that occurs when the air is warm and unstable, floating above colder air. A spinning, funnel shaped-cloud that hits the Earth's surface, usually causing destruction.
The area where air masses meet and do not mix. Associated Activities Weather Alert - Students design a simple model lightning detection system and analyze its effectiveness as a storm-warning system. Lesson Closure Today we discussed weather fronts and storms.
Who can name the four possible types of weather fronts? The type of front depends on the properties of the air masses that are colliding. We can see where weather fronts are located if we look at the weather forecast in the newspaper, on the television, or on the internet.
Eighth grade Lesson Air Masses and Fronts | BetterLesson
Engineers help us predict weather fronts by designing weather stations that accumulate data for air pressure, temperature, humidity and air movement. These measurements are combined and commonly displayed on surface weather analysis maps.
What color lines are used on maps to indicate the types of weather fronts? And what symbols indicate high and low pressure areas? Aeas of high pressure are indicated on surface weather analysis with a letter H, and low pressure with a letter L.
All of these symbols help us describe and understand how the weather is moving. By understanding how storms move around our area, we can better predict the nature, timing and magnitude of storms when they are in the early stages of development. This knowledge allows us to prepare for storms and, therefore, minimize any possible destruction or impact they may have on our daily lives. Engineers also help to develop instruments that measure different weather conditions before and during storms.
Essentially, air masses acquire their relatively uniform surface temperature and moisture characteristics by remaining over one region its source region for an extended period of time, and acquiring the characteristics from the underlying ground or body of water. For example, an air mass that sits over a warm, tropical ocean for a long period of time will become warm and humid.
Air Masses and Fronts
On the other hand, an air mass that sits over the very cold, ice- and snow-covered ground near the North Pole will be very cold and dry. Meteorologists identify five main types of air masses, with designations like "maritime" originating over the ocean or "continental" originating over land.
The image below shows the source regions for the air masses that impact North America. The source regions for air masses that affect North America. David Babb Let's break down these air masses and their specific characteristics: As its name suggests, a maritime-Tropical air mass forms over a tropical body of water. Given that tropical waters are typically warm, the overlying air becomes warm and humid meaning that mT air masses have high dew points. Of course, summer mT air masses are the most stifling, particularly in the Deep South, where daytime temperatures often reach the 90s while merciless and muggy dew points edge toward the middle 70s or higher.
The Gulf of Mexico, Caribbean Sea, and the tropical waters of the western Atlantic and eastern Pacific are also common source regions for mT air masses that affect the contiguous United States. A hot, dry meaning low dew points air mass that originates over desert regions. In summer, temperatures in cT air masses can soar to more than degrees Fahrenheit, but the low dew points often perhaps jokingly cause some folks to refer to the feeling in the air mass as "a dry heat.
An air mass that forms over cold land. Chilly cP air masses often have low dew points, as well. While cP air masses in the summer might be considered refreshing, winter cP air masses are far more chilling, particularly over the northern-tier states, where daytime temperatures below 32 degrees Fahrenheit are the norm and dew points as low as the single digits often increase the demand for lip balm at local stores.
Weather and Climate Because these patterns are so complex, weather can only be predicted probabilistically. This same elicit is also used in an earlier lesson: If you have not used these tanks before they have a removable center divider that keeps the liquids separated until you are ready to mix them together.
Fill one side of the tank with warm water and the other with cold water. There is no need to heat the water, just use the hottest water from the tap.
Air Masses and Fronts
In order to keep one color from leaking into the opposite chamber it is important to pour the two colored liquids in their separate chambers at the same time. The pressure from the two liquids will push against the center divider and prevent the colors from leaking until you pull out the divider.
- 3. Air Masses and Fronts Meet in the Sky...Oh My!
Ask students to describe what they observe and to offer explanations for their observations. Tell your students that the mixing of these two different masses of water is like the mixing of two large masses of air in the atmosphere above us. These images show fronts, cloud cover, precipitation, temperature, jet steam and pressure centers for a given day over North America. Ask students to take some time to think over patterns and connections they see between maps. If you like, you could copy these on transparency paper, then cut them out and have students stack them on top of one another to see the relationship of one variable to the next.
In the next video, I ask some focusing questions to a pair of students to push their thinking. Use the feedback you gather at this time to help you with the class discussion. After a few minutes call the class back together and ask them to share their ideas aloud. Stop the video at Do not show them the section on air masses yet.