Which one of the following may be the true characteristic of cyclones?
Temperate cyclones move from west to east with westerlies whereas tropical cyclones follow trade winds.
Analyzing Cyclone Characteristics
Let's examine each statement about cyclones to determine which one represents a true characteristic.
Option 1: Temperate cyclones move from west to east with westerlies whereas tropical cyclones follow trade winds.
This statement describes the typical movement patterns of temperate and tropical cyclones.
- Temperate Cyclones: These cyclones form in the mid-latitudes (between approximately 30° and 60° latitude). They are typically steered by the prevailing Westerlies winds, which blow from west to east in these latitudes. Therefore, temperate cyclones generally move from west to east.
- Tropical Cyclones: These cyclones form over warm tropical oceans (between approximately 5° and 30° latitude). In their initial stages, they are often steered by the prevailing Trade Winds, which blow from east to west towards the equator. As they move poleward or encounter other weather systems, their path can change, but their initial trajectory is often influenced by the trade winds, causing them to move westward or northwestward.
Based on this understanding, the statement accurately reflects the general movement patterns influenced by the dominant wind systems in their respective regions.
Option 2: The front side of cyclone is known as the 'eye of cyclone'.
This statement is incorrect. The 'eye' of a cyclone is the relatively calm, clear area found at the center of a mature, strong tropical cyclone. It is surrounded by the eyewall, which contains the strongest winds and heaviest rainfall. The eye is not the 'front side' but the core region.
Option 3: Cyclones possess a centre of high pressure surrounded by closed isobars.
This statement is incorrect. Cyclones, by definition, are characterized by a low-pressure center. Air flows inward towards this low-pressure center and then rises. The closed isobars surrounding the center indicate areas of equal atmospheric pressure, and in a cyclone, these isobars show pressure decreasing towards the center.
Option 4: Hurricanes are well-known tropical cyclones which develop over mid-latitudes.
This statement is incorrect. Hurricanes are indeed a type of tropical cyclone, but they develop over tropical or subtropical oceans, specifically in the North Atlantic Ocean, Caribbean Sea, and Northeast Pacific Ocean. Tropical cyclones form over warm waters typically above 26.5°C (80°F), which are found in tropical and subtropical regions, not the mid-latitudes (which are generally cooler). While a hurricane might move into mid-latitudes, it originates in lower latitudes.
Conclusion on Cyclone Characteristics
After analyzing each statement, only the first option accurately describes a true characteristic of cyclones, specifically regarding their movement patterns influenced by global wind systems.
Therefore, the true characteristic among the given options is that temperate cyclones move from west to east with westerlies whereas tropical cyclones follow trade winds.
| Feature | Temperate Cyclones | Tropical Cyclones |
|---|---|---|
| Formation Region | Mid-latitudes (30°-60°) | Tropical & Subtropical Oceans (5°-30°) |
| Pressure System | Low pressure center | Very low pressure center |
| Energy Source | Horizontal temperature contrast (fronts) | Latent heat released from condensation |
| Movement | West to East (steered by Westerlies) | East to West/Northwest (initially steered by Trade Winds) |
| Structure | Associated with fronts (warm & cold) | No fronts; symmetric structure with eye/eyewall |
Revision Table: Key Cyclone Characteristics
Reviewing the key differences helps solidify the understanding of these weather systems:
| Characteristic | Temperate Cyclone | Tropical Cyclone |
|---|---|---|
| Latitude of Formation | 30° - 60° | 5° - 30° |
| Driving Force | Frontogenesis (air mass contrast) | Warm ocean water (> 26.5°C) |
| Typical Movement | West to East | East to West/Northwest |
| Associated Winds | Westerlies | Trade Winds |
| Presence of Fronts | Yes (warm, cold, occluded) | No |
| Eye | Usually not present | Present in strong storms |
Additional Information on Cyclones and Wind Systems
Understanding global wind patterns is crucial to understanding cyclone movement.
- Westerlies: These are prevailing winds in the mid-latitudes that blow from the west towards the east. They are part of the global atmospheric circulation.
- Trade Winds: These are prevailing winds in the tropics, blowing from the high-pressure areas towards the low-pressure areas around the equator. In the Northern Hemisphere, they blow from the northeast, and in the Southern Hemisphere, from the southeast.
- Isobars: Lines on a weather map connecting points of equal atmospheric pressure. In cyclones, these lines are closed and show pressure decreasing towards the center. The closer the isobars, the stronger the pressure gradient and thus the stronger the winds.
- Eye of the Cyclone: A distinctive feature of strong tropical cyclones. It is a region of sinking air, resulting in calm conditions and clear skies at the center, surrounded by the most violent weather in the eyewall.
These concepts help explain why temperate cyclones and tropical cyclones behave and move differently.
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