What is polar Frontal Zone?
In meteorology, the polar front is the weather front boundary between the polar cell and the Ferrel cell around the 60° latitude, near the polar regions, in both hemisphere. At this boundary a sharp gradient in temperature occurs between these two air masses, each at very different temperatures.
What areas does Cyclogenesis occur?
Cyclogenesis is defined as any development or strengthening of cyclonic circulation in the atmosphere. In certain coastal regions, cyclogenesis is a very important phenomenon, for example, along the mid-Atlantic coast of the United States and in the northwestern Gulf of Mexico.
What is the basic concept of polar front theory?
The Polar Front Theory further states that the Cold Front moves faster than the Warm Front which leads to the fact that the Warm Sector becomes more and more narrow and the bulge of cloudiness around the low centre becomes larger and thicker. This is called a “Developed Wave Stage”.
Why polar front is low pressure zone?
After the cold air pushes past the warm air, it meets the cool air in front. When they meet, the warm air ends up rising. This only happens in areas of low atmospheric pressure. The area that has low atmospheric pressure is the polar front.
What is middle latitude cyclone?
Mid-latitude cyclones are huge weather systems that occur most often during the winter season in the United States. These low pressure areas pop up easily during winter because of the large temperature difference between the equator and the North Pole.
What are cyclones Upsc?
Cyclone: UPSC GS – I Notes. A cyclone is any low-pressure area with winds spiralling inwards. Cyclones rotate anti-clockwise in Northern Hemisphere and rotate clockwise in Southern Hemisphere. The process of Cyclone formation and intensification is called Cyclogenesis.
What does cyclogenesis cause?
An explosive cyclogenesis occurs when dry air from the Stratosphere flows into an area of low-pressure. This causes air within the depression to rise very quickly and increase its rotation, which in turn deepens the pressure and creates a more vigorous storm commonly associated with strong destructive winds.
What are the stages of cyclogenesis?
Stages of Cyclogenesis
- Stationary Stage. The first stage of cyclogenesis, the stationary stage, is named so due to the presence of a stationary front.
- Wave Stage.
- Open Stage.
- Occluded Stage.
- Dissipation Stage.
Why is polar front stronger in winter than in summer?
The wind speeds associated with the polar jet stream tend to be stronger in winter as compared to summer. This occurs because there is a greater contrast in temperature between the polar and mid-latitude regions.
Why do polar regions have high pressure?
Because the poles are the areas of the globe that are heated least by the Sun, the air overlying the poles therefore descends towards the surface: this is the cause of polar high pressure.
Are cold fronts high or low pressure?
A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure.
What is another name for mid-latitude cyclone?
extratropical cyclone, also called wave cyclone or midlatitude cyclone, a type of storm system formed in middle or high latitudes, in regions of large horizontal temperature variations called frontal zones.
What are the four stages of a midlatitude cyclone?
Characteristics of a Mid-Latitude Cyclone
- Stationary Stage. The first stage of cyclogenesis, the stationary stage, is named so due to the presence of a stationary front.
- Wave Stage.
- Open Stage.
- Occluded Stage.
- Dissipation Stage.
What is the weather formed during the process of cyclogenesis?
Clouds and precipitation form where air rises. Because cyclones often produce precipitation, they are sometimes just referred to as “storms”. You should realize that these wintertime “storms” are rather large areas of unsettled weather that often produce windy conditions and widespread rain and snow.
What are the 4 stages of a cyclone?
The four stages of the life history of a cyclone are:
- Formative Stage.
- Immature Stage.
- Mature Stage.
- Decaying Stage.
What kind of weather do cold fronts bring?
A cold front commonly brings a narrow band of precipitation that follows along the leading edge of the cold front. These bands of precipitation are often very strong, and can bring severe thunderstorms, hailstorms, snow squalls, and/or tornadoes.
What is an Arctic cold front?
An Arctic Cold Front is a boundary between arctic and polar air masses. An Arctic air mass forms, when the air above a snow/ice covered surface cools down due to very low solar heating and strong heat emission from the surface. Consequently, it is only found above the polar ice areas.
Why low pressure is found at the equator?
A. Equatorial regions is hotter and the air above expands, becomes less dense and rises. This produces a low pressure belt at this latitude.
What front causes low pressure?
Cold, dense air squeezes its way through the warmer, less-dense air, and lifts the warm air. Because air is lifted instead of being pressed down, the movement of a cold front through a warm front is usually called a low-pressure system.
What does frontal cyclone mean?
noun Meteorology. any extratropical cyclone associated with a weather front: the most common cyclonic storm.
What are the 6 stages of a mid-latitude cyclone?