What are the 3 fronts?
There are four different types of weather fronts: cold fronts, warm fronts, stationary fronts, and occluded fronts.
What three air masses are involved in an occluded front?
An Occluded Front forms when a warm air mass gets caught between two cold air masses. The warm air mass rises as the cool air masses push and meet in the middle. The temperature drops as the warm air mass is occluded, or “cut off,” from the ground and pushed upward.
What are 3 factors that often change at a front?
Fronts
- Sharp temperature changes over a relatively short distance.
- Change in moisture content.
- Rapid shifts in wind direction.
- Pressure changes.
- Clouds and precipitation patterns.
What type of air mass is in front of a cold front?
colder air Air mass boundaries Where air masses converge, they form boundaries called "fronts". 3-D view of a cold front. Fronts are identified by change of temperature based upon their motion. With a cold front, a colder air mass is replacing a warmer air mass.
How many air fronts meet in an occluded front?
three air masses Essentially, an occluded front forms as three air masses meet.
What is cold front and warm front?
A cold front extends to the south of the low pressure center, with a warm front to the east. Warm air is located ahead of the cold front and behind the warm front (the so-called "warm sector"), while cool air exists ahead of the warm front and cold air is present behind the cold front.
What is warm front and cold front?
Basically, a weather front represents a boundary between two different air masses, such as warm and cold air. If cold air is advancing into warm air, a cold front is present. On the other hand, if a cold air mass is retreating and warm air is advancing, a warm front exists.
What is a continental polar front?
Continental polar (cP) or continental arctic (cA) air masses are cold, dry, and stable. These air masses originate over northern Canada and Alaska as a result of radiational cooling. They move southward, east of Rockies into the Plains, then eastward.
What is cold front in geography?
A cold front develops when cold air meets an area of warm air. The warm air has a low density so it rises up above the cold air. Large storm clouds develop here as the temperature lowers and the water in the clouds starts to condense and forms rain. Cold Front.
What is an occluded weather front?
Occluded fronts An occluded front is symbolised on a weather map as a line with both semicircles and triangles. They are often coloured purple. These are slightly more complex than cold or warm fronts. The word occluded means 'hidden' and an occlusion occurs when the cold front 'catches up' with the warm front.
What weather comes with a stationary front?
A wide variety of weather may occur along a stationary front. If one or both air masses are humid enough, cloudy skies and prolonged precipitation can occur, with mesocyclone systems.
What is polar front in geography?
polar front, in meteorology, the transition region separating warmer tropical air from colder polar air in the mid-latitudes.
What is convergence front?
According to classical ideas cold air moves rapidly against warm air, thereby creating convergence at the surface line between the two airmasses. This convergence forces the warm, moist air to ascend on the frontal surface. The cloud band develops, inclined rearward from the surface cold front.
What is warm front in geography?
Warm fronts usually show up on the tail end of precipitation and fog. As they overtake cold air masses, warm fronts move slowly, usually from north to south. Because warm fronts aren't as dense or powerful as cold fronts, they bring more moderate and long-lasting weather patterns.
What is cold front weather?
A cold front is defined as the transition zone where a cold air mass is replacing a warmer air mass. Cold fronts generally move from northwest to southeast. The air behind a cold front is noticeably colder and drier than the air ahead of it.
What is a cold front occlusion?
More about occluded fronts One is called a cold occlusion. A cold occlusion occurs when the air behind the occluded front is colder than the air ahead of it. The cold occlusion acts in a similar way to a cold front. The colder air behind the front undercuts and pushes up the air ahead of it.
Are occluded fronts stationary?
Warm Front – a transition zone between a mass of warm air and the cold air it is replacing. Stationary Front – a front between warm and cold air masses that is moving very slowly or not at all. Occluded Front – a composite of two fronts, formed as a cold front overtakes a warm or quasi-stationary front.
What is the cold front?
A cold front is defined as the transition zone where a cold air mass is replacing a warmer air mass. Cold fronts generally move from northwest to southeast. The air behind a cold front is noticeably colder and drier than the air ahead of it.
What is a purple front?
The symbol for an occluded front is a purple line with alternating triangles and semi-circles (also purple) pointing in the direction the front is moving.
What is divergent airflow?
Divergence occurs when a stronger wind moves away from a weaker wind or when air streams move in opposite directions. When divergence occurs in the upper levels of the atmosphere it leads to rising air.
What is divergence and convergence?
Divergence generally means two things are moving apart while convergence implies that two forces are moving together. In the world of economics, finance, and trading, divergence and convergence are terms used to describe the directional relationship of two trends, prices, or indicators.
What occurs in a cold front?
During a cold front, a cold air mass collides with a warmer air mass. When this happens, the warmer air is less dense and therefore is thrust upward along the front. As the warm air rises, the moisture begins to condense and form clouds and precipitation.
What do warm fronts cause?
Characteristics
| Weather phenomenon | While the front is passing |
|---|---|
| Temperature | Warming suddenly |
| Atmospheric pressure | Leveling off |
| Winds | Variable |
| Precipitation | Persistent rain, usually moderate with some lighter periods and some heavier bursts. In winter, snow may turn to rain after passing through ice pellets and freezing rain. |
What happens during warm type occluded front?
A warm occlusion occurs when the cold air behind the occluded front is warmer than the air ahead of it. The warm occlusion acts in a similar way to a warm front. The cold air behind the front is less dense than the even colder air ahead of it, and so it passes over the top of the colder air.
What do cold fronts bring?
Cold fronts usually bring cooler weather, clearing skies, and a sharp change in wind direction.
What is stationary front and occluded front?
Stationary Front – a front between warm and cold air masses that is moving very slowly or not at all. Occluded Front – a composite of two fronts, formed as a cold front overtakes a warm or quasi-stationary front.
Where does a warm front form?
Warm fronts usually form on the leading edge of a low pressure system, which is generally on the northeastern side, bringing warmer temperatures from the south, northward. On weather maps, they are defined as red half-circles that point in the direction that the front is moving.
What is a red and blue weather front?
A stationary front is depicted by an alternating red and blue line with a triangle on the blue portion and half-moon on the opposite side of the red portion of the line. A cold front (or warm front) that stops moving becomes a stationary front.
What color is occluded front?
purple An occluded front is symbolised on a weather map as a line with both semicircles and triangles. They are often coloured purple.
What are convergent winds?
Convergence in a horizontal wind field indicates that more air is entering a given area than is leaving at that level. To compensate for the resulting "excess," vertical motion may result: upward forcing if convergence is at low levels, or downward forcing (subsidence) if convergence is at high levels.