6.E.2B.2 AIR MASSES, PRESSURES & FRONTS - SOUTH CAROLINA 6TH GRADE SCIENCE
How do air masses, fronts and pressure systems result in various weather an understanding of the relationship between Earth's atmospheric properties and . Diagrams, Water Cycle Song, Streamline Video, Smartboard Activities, Foss Kit. Results 1 - 24 of Weather Map Song/ Cold Fronts, Warm Fronts . you students It allows them to demonstrate their knowledge of air masses, weather maps, . Atmosphere (Air, Water, and Climate) Bundle--Click on LINKS below to preview. With unsettled weather approaching I opted for a moody song choice for edge of the southward moving mass of cold air on the west side of the Low. Cold fronts are generally drawn in blue on a surface weather map. Here are the links to two short video segments of cold front passing through Tucson.
As the front approaches, rainfall gradually increases, and the clouds preceding the warm front are most often stratiform. Preceding a warm frontal passage, fog can also occur.
After a frontal passage, warming and clearing is typically rapid. Thunderstorms can be deposited amidst stratiform clouds preceding the front, and the thundershowers can continue after the frontal passage, if the mass of warm air is unstable.
The key difference between cold fronts and warm fronts is how they are created. Of course, a cold front is associated with colder weather and a warm front is associated with warmer weather.
The primary differences include: Warm fronts occur when cold fronts are crashed into by a warm air mass, causing it to rise. Cold fronts occur when warm fronts and cold fronts collide, and driven upward. Both warm fronts and cold fronts clash, but they never mix. They drive each other up. What is an Isotherm Gradient? Isotherms are defined as the lines on a weather map that connect the points of equal temperature.
So, the temperature values are the same at each point along a given isotherm. They are created from simultaneous, regularly scheduled temperature readings at different locations. The process of constructing a map of isotherms is referred to as contouring, and it is a rudimentary step in temperature data analysis.
As a cold front approaches, atmospheric pressure drops. As this weather front passes, the winds that are present will shift from south to southwest, and eventually they will begin to blow in a westerly direction.
Due to the air masses contrasting greatly on each side of the front, it is very possible for violent, unstable weather conditions to form. Intense downpours that tend to last for a short time are common due to towering cumulonumbus clouds. Being ahead of an approaching cold front can create one of the most extreme weather conditions to form, known as tornadoes.
Winds spin in a counterclockwise direction and spiral inward around low pressure.
The converging winds cause air to rise, expand, and cool. If the air is moist and there is sufficient cooling clouds can form.
Pretty much the opposite is true with high pressure clockwise winds spiral outward, divergence causes sinking air and clear skies. The spacing of the contour lines tells you something about wind speed. Closely spaced contours, a strong pressure gradient, create strong winds. Widely spaced contours, a weak pressure gradient, produce slower winds.
Today we'll see that once the winds start to blow they can affect and change the temperature pattern. The figure below shows the temperature pattern you would expect to see if the wind wasn't blowing at all or if the wind was just blowing straight from west to east.
The bands of different temperature are aligned parallel to the lines of latitude. Temperature changes from south to north but not from west to east.
Fri. Feb. 8 notes
This picture gets a little more interesting if you put centers of high or low pressure in the middle. In the case of high pressure, the clockwise spinning winds move warm air to the north on the western side of the High.
The front edge of this northward moving air is shown with a dotted line at Pt.
W in the picture above. Cold air moves toward the south on the eastern side of the High another dotted line at Pt. The diverging winds also move the warm and cold air away from the center of the High. Now you would experience a change in temperature if you traveled from west to east across the center of the picture.
- Weather Links
The transition from warm to cold along the boundaries Pts. W and C is spread out over a fairly long distance and is gradual. This is because the winds around high pressure blow outward away from the center of high pressure. There is also some mixing of the different temperature air along the boundaries. Counterclockwise winds move cold air toward the south on the west side of the Low. Warm air advances toward the north on the eastern side of the low.
What is a Warm Front and Cold Front and the Differences Between Them
This is just the opposite of what we saw with high pressure. The converging winds in the case of low pressure will move the air masses of different temperature in toward the center of low pressure. The transition zone between different temperature air gets squeezed and compressed. The change from warm to cold occurs in a shorter distance and is more abrupt. Solid lines have been used to delineate the boundaries above.
These sharper and more abrupt boundaries between are called fronts. A cold front is drawn at the front edge of the southward moving mass of cold air on the west side of the Low. Cold fronts are generally drawn in blue on a surface weather map.
The small triangular symbols on the side of the front identify it as a cold front and show what direction it is moving. The fronts are like spokes on a wheel. The "spokes" will spin counterclockwise around the low pressure center the axle.
A warm front drawn in red with half circle symbols is shown on the right hand side of the map at front edge of the northward moving mass of.